0000929008-22-000040 | 10-Q | XBRL Viewer

COVER PAGE - shares	9 Months Ended
COVER PAGE - shares	Sep. 30, 2022	Nov. 03, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2022
Document Transition Report	false
Entity File Number	001-14989
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	25-1723342
Entity Address, Address Line One	225 West Station Square DriveSuite 700
Entity Address, City or Town	Pittsburgh,
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	15219
City Area Code	412
Local Phone Number	454-2200
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Registrant Name	WESCO International, Inc.
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Current Reporting Status	Yes
Entity Central Index Key	0000929008
Entity Common Stock, Shares Outstanding		50,843,668
Entity Listings [Line Items]
Entity Common Stock, Shares Outstanding		50,843,668
Common Class A [Member]
Cover [Abstract]
Title of 12(b) Security	Common Stock, par value $.01 per share
Trading Symbol	WCC
Security Exchange Name	NYSE
Entity Listings [Line Items]
Title of 12(b) Security	Common Stock, par value $.01 per share
Trading Symbol	WCC
Security Exchange Name	NYSE
Series A Preferred Stock [Member]
Cover [Abstract]
Title of 12(b) Security	Depositary Shares, each representing a 1/1,000th interest in a share of Series A Fixed-Rate Reset Cumulative Perpetual Preferred Stock
Trading Symbol	WCC PR A
Security Exchange Name	NYSE
Entity Listings [Line Items]
Title of 12(b) Security	Depositary Shares, each representing a 1/1,000th interest in a share of Series A Fixed-Rate Reset Cumulative Perpetual Preferred Stock
Trading Symbol	WCC PR A
Security Exchange Name	NYSE

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents	$ 234,083	$ 212,583
Accounts Receivable, after Allowance for Credit Loss, Current	3,622,067	2,957,613
Accounts and Other Receivables, Net, Current	388,748	375,885
Inventories, net	3,490,121	2,666,219
Prepaid expenses and other current assets	162,068	137,811
Assets, Current	7,897,087	6,350,111
Property, buildings and equipment, net of accumulated depreciation of $229,041 and $213,758 in 2014 and 2013, respectively	372,083	379,012
Operating Lease, Right-of-Use Asset	575,159	530,863
Intangible assets, net	1,853,451	1,944,141
Goodwill	3,123,430	3,208,333
Other assets	259,354	205,239
Assets	14,080,564	12,617,699
Accounts payable	2,578,741	2,140,251
Accrued payroll and benefit costs	239,309	314,962
Current portion of long-term debt	69,295	9,528
Other Liabilities, Current	680,227	585,067
Liabilities, Current	3,567,572	3,049,808
Total long-term debt	5,192,816	4,701,542
Operating Lease, Liability, Noncurrent	455,356	414,248
Deferred Income Tax Liabilities, Net	443,245	437,444
Other Liabilities, Noncurrent	229,629	238,446
Liabilities	9,888,618	8,841,488
Commitments and Contingencies
Additional capital	1,993,709	1,969,332
Retained earnings	$ 3,590,688	$ 3,004,690
Treasury stock, shares (in shares)	22,026,044	22,026,922
Treasury stock, at cost; 22,026,044 and 22,026,922 shares in 2022 and 2021, respectively	$ (957,805)	$ (956,188)
Accumulated other comprehensive income	(430,500)	(236,035)
Total WESCO International, Inc. stockholders' equity	4,196,820	3,782,524
Noncontrolling interest	(4,874)	(6,313)
Total stockholders’ equity	4,191,946	3,776,211
Liabilities and Equity	$ 14,080,564	$ 12,617,699
Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Preferred stock, shares outstanding (in shares)	0	0
Preferred stock, shares issued (in shares)	0	0
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding	$ 0	$ 0
Series A Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0.01
Preferred stock, shares authorized (in shares)	25,000
Preferred stock, shares outstanding (in shares)	21,612
Preferred stock, shares issued (in shares)	21,612	21,612
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding	$ 0	$ 0
Common Stock [Member]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	210,000,000	210,000,000
Common stock, shares, issued (in shares)	68,523,468	68,162,297
Common stock, shares outstanding (in shares)	50,836,855	50,474,806
Common stock	$ 685	$ 682
Common Class B [Member]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares, issued (in shares)	4,339,431	4,339,431
Common stock, shares outstanding (in shares)	0	0
Common stock	$ 43	$ 43

CONSOLIDATED BALANCE SHEETS (parenthetical items) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Accounts Receivable, Allowance for Credit Loss, Current	$ 46,663	$ 41,723
Accumulated depreciation	406,960	365,345
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	$ 60,765	$ 70,572

CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Gross Profit [Abstract]
Revenues	$ 5,445,916	$ 4,728,325	$ 15,861,622	$ 13,365,592
Cost of goods sold	4,241,401	3,720,332	12,418,561	10,581,406
Operating Expenses [Abstract]
Selling, general and administrative expense	760,200	721,795	2,251,162	2,057,952
Depreciation and amortization	42,723	56,732	135,569	144,645
Income from operations	401,592	229,466	1,056,330	581,589
Nonoperating Income (Expense)	75,057	69,720	207,155	207,683
Other Nonoperating Income (Expense)	688	(5,320)	3,007	(8,929)
Income before income taxes	325,847	165,066	846,168	382,835
Provision for income taxes	85,637	44,870	203,178	84,201
Net income	240,210	120,196	642,990	298,634
Net (loss) income attributable to noncontrolling interest	608	600	1,439	665
Net income attributable to WESCO International, Inc.	239,602	119,596	641,551	297,969
Preferred Stock Dividends, Income Statement Impact	14,352	14,352	43,056	43,056
Net Income (Loss) Available to Common Stockholders, Basic	225,250	105,244	598,495	254,913
Comprehensive Income:
Foreign currency translation adjustment	(146,732)	(50,277)	(194,465)	(12,217)
Comprehensive income attributable to WESCO International, Inc.	$ 78,518	$ 54,967	$ 404,030	$ 242,696
Basic (in dollars per share)	$ 4.43	$ 2.09	$ 11.80	$ 5.07
Diluted (in dollars per share)	$ 4.30	$ 2.02	$ 11.42	$ 4.91

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating Activities:
Net income	$ 642,990	$ 298,634
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	135,569	144,645
Stock-based compensation expense	34,446	22,784
Amortization of Debt Issuance Costs and Discounts	11,610	15,290
Gain (Loss) on Disposition of Business	0	(8,927)
Deferred income taxes	7,246	(5,340)
Other operating activities, net	4,237	8,604
Changes in assets and liabilities
Increase (Decrease) in Accounts Receivable	737,639	521,491
Increase (Decrease) in Accounts and Other Receivables	(15,097)	(84,326)
Inventories, net	(886,328)	(428,405)
Increase (Decrease) in Other Operating Assets	(101,476)	19,299
Accounts payable	479,645	550,858
Accrued payroll and benefit costs	(88,420)	65,136
Other current and noncurrent liabilities	102,596	95,909
Net cash provided by operating activities	(410,621)	172,670
Investing Activities:
Capital expenditures	(59,366)	(25,170)
Proceeds from Divestiture of Businesses, Net of Cash Divested	0	56,010
Other investing activities	2,159	5,766
Net cash used in investing activities	(57,207)	36,606
Financing Activities:
Proceeds from (Repayments of) Short-term Debt	1,324	(10,288)
Proceeds from issuance of long-term debt	3,140,953	2,470,306
Repayments of Other Long-term Debt	2,592,996	1,935,655
Payments for Repurchase of Common Stock	(24,963)	(20,784)
Payments of Dividends	(43,056)	(43,056)
Other financing activities, net	(1,678)	(14,174)
Net cash used in financing activities	477,251	(410,204)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	21,500	(197,336)
Interest Paid, Including Capitalized Interest, Operating and Investing Activities	140,668	141,594
Income Taxes Paid	219,826	53,759
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	170,498	120,384
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations	12,077	3,592
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents	234,083	251,799
Payments of Debt Issuance Costs	2,333	1,849
5.375% Senior Notes due 2021
Financing Activities:
Repayments of Senior Debt	0	500,000
Repayments of Senior Debt	0	500,000
5.375% Senior Notes due 2024
Financing Activities:
Repayments of Senior Debt	0	354,704
Repayments of Senior Debt	$ 0	$ 354,704

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY Statement - USD ($) $ in Thousands	Total	Common Class B [Member]	Common Stock [Member]	Series A Preferred Stock [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Additional Paid-in Capital [Member]
Common stock		$ 43	$ 676
Common Stock, Shares, Issued		4,339,431	67,596,515
Additional capital	$ 1,942,810
Retained Earnings (Accumulated Deficit)	2,601,662
Treasury Stock, Value	$ (938,335)
ERROR in label resolution.	(21,870,961)
Stockholders' Equity Attributable to Noncontrolling Interest	$ (7,333)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(263,134)
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding				$ 0
Preferred stock, shares issued (in shares)				21,612
Stock Issued, Value, Stock Options Exercised, Net of Tax Benefit (Expense)			$ 2				$ (1,421)
APIC, Share-based Payment Arrangement, Recognition and Exercise	(38)
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture	5,954
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation			$ 0					$ 617	$ 2,209
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			165,641				15,330
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation			(35,289)
Net Income (Loss) Attributable to Parent	59,178
Dividends, Preferred Stock	(14,352)
Net Income (Loss) Attributable to Noncontrolling Interest						$ (24)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax					$ 16,841
Net Income (Loss) Attributable to Parent	297,969
Net Income (Loss) Attributable to Noncontrolling Interest	665
Common stock		$ 43	$ 678
Common Stock, Shares, Issued		4,339,431	67,726,867
Additional capital	1,946,517
Retained Earnings (Accumulated Deficit)	2,645,871
Treasury Stock, Value	$ (939,756)
ERROR in label resolution.	(21,886,291)
Stockholders' Equity Attributable to Noncontrolling Interest	$ (7,357)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(246,293)
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding				$ 0
Preferred stock, shares issued (in shares)				21,612
Stock Issued, Value, Stock Options Exercised, Net of Tax Benefit (Expense)			$ 2				$ (7,942)
APIC, Share-based Payment Arrangement, Recognition and Exercise	(1)
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture	7,225
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation			$ 0					49	88
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			194,615				74,698
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation			(1,520)
Net Income (Loss) Attributable to Parent	119,195
Dividends, Preferred Stock	(14,352)
Net Income (Loss) Attributable to Noncontrolling Interest						89
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax					21,219
Common stock		$ 43	$ 680
Common Stock, Shares, Issued		4,339,431	67,919,962
Additional capital	1,953,653
Retained Earnings (Accumulated Deficit)	2,750,665
Treasury Stock, Value	$ (947,698)
ERROR in label resolution.	(21,960,989)
Stockholders' Equity Attributable to Noncontrolling Interest	$ (7,268)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(225,074)
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding				$ 0
Preferred stock, shares issued (in shares)				21,612
Stock Issued, Value, Stock Options Exercised, Net of Tax Benefit (Expense)			$ 2				$ (2,306)
APIC, Share-based Payment Arrangement, Recognition and Exercise	(2)
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture	9,605
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation			$ (1)					4,162	1,887
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			187,770				19,858
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation			(58,214)
Net Income (Loss) Attributable to Parent	119,596
Dividends, Preferred Stock	(14,352)
Net Income (Loss) Attributable to Noncontrolling Interest	600					600
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax					(50,277)
Common stock		$ 43	$ 681
Common Stock, Shares, Issued		4,339,431	68,049,518
Additional capital	1,961,369
Retained Earnings (Accumulated Deficit)	2,851,747
Treasury Stock, Value	$ (950,004)
ERROR in label resolution.	(21,980,847)
Stockholders' Equity Attributable to Noncontrolling Interest	$ (6,668)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(275,351)
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding				$ 0
Preferred stock, shares issued (in shares)				21,612
Common stock		$ 43	$ 682
Common Stock, Shares, Issued		4,339,431	68,162,297
Additional capital	1,969,332
Retained Earnings (Accumulated Deficit)	3,004,690
Treasury Stock, Value	$ (956,188)
ERROR in label resolution.	(22,026,922)
Stockholders' Equity Attributable to Noncontrolling Interest	$ (6,313)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(236,035)
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding				$ 0
Preferred stock, shares issued (in shares)				21,612
Stock Issued, Value, Stock Options Exercised, Net of Tax Benefit (Expense)			$ 4				$ (587)
APIC, Share-based Payment Arrangement, Recognition and Exercise	(10)
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture	8,911
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation			$ (2)					8,136	7,832
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			365,833				858
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation			(129,869)
Net Income (Loss) Attributable to Parent	181,243
Dividends, Preferred Stock	(14,352)
Net Income (Loss) Attributable to Noncontrolling Interest						388
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax					31,640
Net Income (Loss) Attributable to Parent	641,551
Net Income (Loss) Attributable to Noncontrolling Interest	1,439
Common stock		$ 43	$ 684
Common Stock, Shares, Issued		4,339,431	68,398,261
Additional capital	1,970,401
Retained Earnings (Accumulated Deficit)	3,163,445
Treasury Stock, Value	$ (956,775)
ERROR in label resolution.	(22,027,780)
Stockholders' Equity Attributable to Noncontrolling Interest	$ (5,925)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(204,395)
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding				$ 0
Preferred stock, shares issued (in shares)				21,612
Stock Issued, Value, Stock Options Exercised, Net of Tax Benefit (Expense)			$ 0				$ (311)
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture	15,823
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation			$ 0					40
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			11,648				2,301
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation			(908)
Net Income (Loss) Attributable to Parent	220,706
Dividends, Preferred Stock	(14,352)
Stockholders' Equity, Other			$ 10				$ 3	1,177	(257)
Net Income (Loss) Attributable to Noncontrolling Interest						443
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax					(79,373)
Common stock		$ 43	$ 694
Common Stock, Shares, Issued		4,339,431	68,409,001
Additional capital	1,985,967
Retained Earnings (Accumulated Deficit)	3,370,936
Treasury Stock, Value	$ (957,083)
ERROR in label resolution.	(22,030,081)
Stockholders' Equity Attributable to Noncontrolling Interest	$ (5,482)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(283,768)
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding				$ 0
Preferred stock, shares issued (in shares)				21,612
Stock Issued, Value, Stock Options Exercised, Net of Tax Benefit (Expense)			$ 2				$ (722)
APIC, Share-based Payment Arrangement, Recognition and Exercise	38
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture	9,712
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation			$ (1)					4,411	2,023
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			174,996				4,037
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation			(60,529)
Net Income (Loss) Attributable to Parent	239,602
Dividends, Preferred Stock	(14,352)
Stockholders' Equity, Other			$ (10)					$ (1,087)	$ 15
Net Income (Loss) Attributable to Noncontrolling Interest	608					$ 608
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax					$ (146,732)
Common stock		$ 43	$ 685
Common Stock, Shares, Issued		4,339,431	68,523,468
Additional capital	1,993,709
Retained Earnings (Accumulated Deficit)	3,590,688
Treasury Stock, Value	$ (957,805)
ERROR in label resolution.	(22,026,044)
Stockholders' Equity Attributable to Noncontrolling Interest	$ (4,874)
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (430,500)
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding				$ 0
Preferred stock, shares issued (in shares)				21,612

ORGANIZATION	9 Months Ended
ORGANIZATION	Sep. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
ORGANIZATION	WESCO International, Inc. ("Wesco International") and its subsidiaries (collectively, “Wesco” or the "Company"), headquartered in Pittsburgh, Pennsylvania, is a leading provider of business-to-business distribution, logistics services and supply chain solutions.

ACCOUNTING POLICIES	9 Months Ended
ACCOUNTING POLICIES	Sep. 30, 2022
Accounting Policies [Abstract]
ACCOUNTING POLICIES	Basis of Presentation The accompanying unaudited Condensed Consolidated Financial Statements of Wesco have been prepared in accordance with Rule 10-01 of Regulation S-X of the Securities and Exchange Commission (the “SEC”). The unaudited condensed consolidated financial information should be read in conjunction with the audited Consolidated Financial Statements and Notes thereto included in WESCO International, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2021, as filed with the SEC on February 25, 2022. The Condensed Consolidated Balance Sheet at December 31, 2021 was derived from the audited Consolidated Financial Statements as of that date, but does not include all of the disclosures required by accounting principles generally accepted in the United States of America. The unaudited Condensed Consolidated Balance Sheet as of September 30, 2022, the unaudited Condensed Consolidated Statements of Income and Comprehensive Income and the unaudited Condensed Consolidated Statements of Stockholders' Equity for the three and nine months ended September 30, 2022, and 2021, and the unaudited Condensed Consolidated Statements of Cash Flows for the nine months ended September 30, 2022, and 2021, respectively, in the opinion of management, have been prepared on the same basis as the audited Consolidated Financial Statements and include all adjustments necessary for the fair statement of the results of the interim periods presented herein. All adjustments reflected in the unaudited condensed consolidated financial information are of a normal recurring nature unless indicated. The results for the interim periods presented herein are not necessarily indicative of the results to be expected for the full year. Recently Adopted and Recently Issued Accounting Standards In March 2020, the Financial Accounting Standards Board (the "FASB") issued Accounting Standards Update ("ASU") 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting, which provides optional guidance for a limited period of time to ease the potential burden in accounting for (or recognizing the effects of) reference rate reform on financial reporting. The amendments in this ASU are effective for all entities as of March 12, 2020 through December 31, 2022. The Company adopted this ASU during the first quarter of 2022 in connection with amending Wesco's credit facilities, as disclosed in Note 7, "Debt". The replacement of London Interbank Offered Rate ("LIBOR") and the related adoption of the optional guidance under this accounting standard did not have a material impact on the Company's consolidated financial statements and notes thereto. In October 2021, the FASB issued ASU 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers, which requires contract assets and contract liabilities acquired in a business combination to be recognized and measured by the acquirer on the acquisition date in accordance with ASC Topic 606, Revenue from Contracts with Customers, as if the acquirer had originated the contracts. The amendments in this ASU are effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years. Management is currently evaluating the impact that the adoption of this accounting standard will have on its consolidated financial statements and notes thereto. In September 2022, the FASB issued ASU 2022-04, Supplier Finance Programs (Subtopic 405-50): Disclosure of Supplier Finance Program Obligations, which requires that a buyer in a supplier finance program disclose sufficient information about the program to allow a user of financial statements to understand the program's nature, activity during the period, changes from period to period, and potential magnitude. The amendments in this ASU are effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years, except for the amendment on rollforward information, which is effective for fiscal years beginning after December 15, 2023. Early adoption is permitted. Management is currently evaluating the impact that the adoption of this accounting standard will have on its consolidated financial statements and notes thereto. Other pronouncements issued by the FASB or other authoritative accounting standards groups with future effective dates are either not applicable or are not expected to be significant to Wesco’s financial position, results of operations or cash flows.
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]	Recently Adopted and Recently Issued Accounting Standards In March 2020, the Financial Accounting Standards Board (the "FASB") issued Accounting Standards Update ("ASU") 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting, which provides optional guidance for a limited period of time to ease the potential burden in accounting for (or recognizing the effects of) reference rate reform on financial reporting. The amendments in this ASU are effective for all entities as of March 12, 2020 through December 31, 2022. The Company adopted this ASU during the first quarter of 2022 in connection with amending Wesco's credit facilities, as disclosed in Note 7, "Debt". The replacement of London Interbank Offered Rate ("LIBOR") and the related adoption of the optional guidance under this accounting standard did not have a material impact on the Company's consolidated financial statements and notes thereto.

- Definition

The entire disclosure for change in accounting principle. Includes, but is not limited to, nature, reason, and method of adopting amendment to accounting standards or other change in accounting principle.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-URI https://asc.fasb.org/topic&trid=2122394

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 105
-SubTopic 10
-Section 65
-Paragraph 6
-Subparagraph (f)
-URI https://asc.fasb.org/extlink&oid=126987489&loc=SL124442142-165695

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 20
-Section 65
-Paragraph 2
-Subparagraph (d)(1)
-URI https://asc.fasb.org/extlink&oid=126986314&loc=SL124402458-218513

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (g)(2)(iii)
-URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641

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+ Details

REVENUE (Notes)

9 Months Ended

Sep. 30, 2022

Revenue from Contract with Customer [Abstract]

Revenue from Contract with Customer

3. REVENUE

Wesco distributes products and provides services to customers globally in various end markets within its business segments. The segments, which consist of EES, CSS and UBS, operate in the United States, Canada and various other international countries.

The following tables disaggregate Wesco’s net sales by segment and geography for the periods presented:


	Three Months Ended				Nine Months Ended
	September 30				September 30
(In thousands)	2022		2021		2022		2021
Electrical & Electronic Solutions	$	2,234,771	$	1,982,485	$	6,654,883	$	5,626,309
Communications & Security Solutions	1,602,459		1,488,689		4,638,631		4,200,424
Utility & Broadband Solutions	1,608,686		1,257,151		4,568,108		3,538,859
Total by segment	$	5,445,916	$	4,728,325	$	15,861,622	$	13,365,592


	Three Months Ended				Nine Months Ended
	September 30				September 30
(In thousands)	2022		2021		2022		2021
United States	$	4,050,924	$	3,407,437	$	11,745,090	$	9,656,183
Canada	765,281		709,507		2,288,146		2,020,395
Other International(1)	629,711		611,381		1,828,386		1,689,014
Total by geography(2)	$	5,445,916	$	4,728,325	$	15,861,622	$	13,365,592

(1) No individual country's net sales are greater than 10% of total net sales.

(2) Wesco attributes revenues from external customers to individual countries on the basis of point of sale.

Due to the terms of certain contractual arrangements, Wesco bills or receives payment from its customers in advance of satisfying the respective performance obligation. Such advance billings or payments are recorded as deferred revenue and recognized as revenue when the performance obligation has been satisfied and control has transferred to the customer, which is generally upon shipment. Deferred revenue is usually recognized within a year or less from the date of the advance billing or payment. At September 30, 2022 and December 31, 2021, $55.5 million and $35.5 million, respectively, of deferred revenue was recorded as a component of other current liabilities in the Condensed Consolidated Balance Sheets.

The Company also has certain long-term contractual arrangements where revenue is recognized over time based on the cost-to-cost input method. As of September 30, 2022 and December 31, 2021, the Company had contract assets of $38.6 million and $33.4 million, respectively, resulting from arrangements where the amount of revenue recognized exceeded the amount billed to the customer. Contract assets are recorded in the Condensed Consolidated Balance Sheets as a component of prepaid expenses and other current assets.

Wesco’s revenues are adjusted for variable consideration, which includes customer volume rebates, returns and discounts. Wesco measures variable consideration by estimating expected outcomes using analysis and inputs based upon historical data, as well as current and forecasted information. Variable consideration is reviewed by management on a monthly basis and revenue is adjusted accordingly. Variable consideration reduced revenue for the three months ended September 30, 2022 and 2021 by approximately $120.5 million and $85.8 million, respectively, and by approximately $324.1 million and $246.9 million for the nine months ended September 30, 2022 and 2021, respectively. The variable consideration for the three and nine months ended September 30, 2021 reflect adjustments that reduced the previously disclosed amounts by $9.7 million and $27.8 million, respectively. As of September 30, 2022 and December 31, 2021, the Company's estimated product return obligation was $45.5 million and $38.8 million, respectively.

Billings to customers for shipping and handling are recognized in net sales. Wesco has elected to recognize shipping and handling costs as a fulfillment cost. Shipping and handling costs recorded as a component of selling, general and administrative expenses totaled $77.9 million and $63.5 million for the three months ended September 30, 2022 and 2021, respectively, and $222.0 million and $179.5 million for the nine months ended September 30, 2022 and 2021, respectively

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

GOODWILL (Notes)

9 Months Ended

Sep. 30, 2022

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets Disclosure

Goodwill

The following table sets forth the changes in the carrying value of goodwill:


	Nine Months Ended
	September 30, 2022
	EES		CSS		UBS		Total
	(In thousands)
Beginning balance, January 1	$	860,958	$	1,121,712	$	1,225,663	$	3,208,333
Foreign currency exchange rate changes	(44,301)		(14,449)		(26,153)		(84,903)
Ending balance, September 30	$	816,657	$	1,107,263	$	1,199,510	$	3,123,430

Intangible Assets

The components of intangible assets are as follows:


		As of
		September 30, 2022						December 31, 2021
	Life (in years)	Gross Carrying Amount (1)		Accumulated Amortization (1)		Net Carrying Amount		Gross Carrying Amount (1)		Accumulated Amortization (1)		Net Carrying Amount
Intangible assets:		(In thousands)
Trademarks	Indefinite	$	791,228	$	—	$	791,228	$	795,065	$	—	$	795,065
Customer relationships	10 - 20	1,400,841		(352,638)		1,048,203		1,431,251		(308,180)		1,123,071
Distribution agreements	15 - 19	29,212		(23,936)		5,276		29,212		(22,714)		6,498
Trademarks	5 - 12	15,543		(6,799)		8,744		38,758		(20,058)		18,700
Non-compete agreements	2	—		—		—		4,300		(3,493)		807
		$	2,236,824	$	(383,373)	$	1,853,451	$	2,298,586	$	(354,445)	$	1,944,141

(1) Excludes the original cost and related accumulated amortization of fully-amortized intangible assets.

Amortization expense related to intangible assets totaled $21.0 million and $37.1 million for the three months ended September 30, 2022 and 2021, respectively, and $71.4 million and $85.8 million for the nine months ended September 30, 2022 and 2021, respectively.

The following table sets forth the remaining estimated amortization expense for intangible assets for the next five years and thereafter:


For the year ending December 31,	(In thousands)
2022	$	20,467
2023	81,838
2024	79,445
2025	76,389
2026	71,073
Thereafter	733,011

STOCK-BASED COMPENSATION (Notes)

9 Months Ended

Sep. 30, 2022

Share-Based Payment Arrangement [Abstract]

STOCK-BASED COMPENSATION

Wesco’s stock-based compensation awards are comprised of stock options, stock-settled stock appreciation rights, restricted stock units and performance-based awards. Compensation cost for all stock-based awards is measured at fair value on the date of grant and compensation cost is recognized, net of estimated forfeitures, over the service period for awards expected to vest. The fair value of stock options and stock-settled stock appreciation rights is determined using the Black-Scholes model. The fair value of restricted stock units and performance-based awards with performance conditions is determined by the grant-date closing price of Wesco’s common stock. The forfeiture assumption is based on Wesco’s historical participant behavior that is reviewed on an annual basis. No dividends are assumed. For stock options and stock-settled stock appreciation rights that are exercised, and for restricted stock units and performance-based awards that vest, shares are issued out of Wesco's outstanding common stock.

Stock options and stock-settled stock appreciation rights vest ratably over a three-year period and terminate on the tenth anniversary of the grant date unless terminated sooner under certain conditions. Restricted stock unit awards granted in February 2020 and prior vest based on a minimum time period of three years. The special award described below vests in tranches. Restricted stock units awarded in 2022 and 2021 vest ratably over a three-year period on each of the first, second and third anniversaries of the grant date. Vesting of performance-based awards is based on a three-year performance period, and the number of shares earned, if any, depends on the attainment of certain performance levels. Outstanding awards would vest upon the consummation of a change in control transaction with performance-based awards vesting at the target level.

On July 2, 2020, a special award of restricted stock units was granted to certain officers of the Company. These awards vest in tranches of 30% on each of the first and second anniversaries of the grant date and 40% on the third anniversary of the grant date, subject, in each case, to continued employment through the applicable anniversary date.

Performance-based awards granted in 2022, 2021 and 2020 are based on two equally-weighted performance measures: the three-year average growth rate of Wesco's net income attributable to common stockholders and the three-year cumulative return on net assets. These awards are accounted for as awards with performance conditions; compensation cost is recognized over the performance period based upon Wesco's determination of whether it is probable that the performance targets will be achieved.

During the three and nine months ended September 30, 2022 and 2021, Wesco granted the following stock options, stock-settled stock appreciation rights, restricted stock units and performance-based awards at the following weighted-average fair values:


	Three Months Ended				Nine Months Ended
	September 30, 2022		September 30, 2021		September 30, 2022		September 30, 2021
Stock options granted	3,249		—		92,799		—
Weighted-average fair value	$	54.13	$	—	$	57.15	$	—

Stock-settled stock appreciation rights granted	—		—		—		139,592
Weighted-average fair value	$	—	$	—	$	—	$	33.19

Restricted stock units granted	1,669		6,897		226,615		314,480
Weighted-average fair value	$	112.33	$	108.76	$	122.04	$	77.81

Performance-based awards granted	—		—		83,991		122,812
Weighted-average fair value	$	—	$	—	$	122.09	$	76.76

The fair values of stock options and stock-settled stock appreciation rights, as disclosed in the table above, were estimated using the following weighted-average assumptions in the respective periods:


	Three Months Ended			Nine Months Ended
	September 30, 2022		September 30, 2021	September 30, 2022		September 30, 2021
Risk free interest rate	2.9	%	n/a	2.0	%	0.8	%
Expected life (in years)	7		n/a	7		7
Expected volatility	44	%	n/a	43	%	41	%

The risk-free interest rate is based on the U.S. Treasury Daily Yield Curve as of the grant date. The expected life is based on historical exercise experience and the expected volatility is based on the volatility of the Company's daily stock price over the expected life preceding the grant date of the award.

The following table sets forth a summary of stock options for the nine months ended September 30, 2022:


	Awards	Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (In years)	Aggregate Intrinsic Value (In thousands)
Outstanding at December 31, 2021	—	$	—
Granted	92,799	121.58
Exercised	—	—
Forfeited	(5,452)	122.09
Outstanding at September 30, 2022	87,347	$	121.55	9.3	$	39
Exercisable at September 30, 2022	879	$	122.09	0.9	$	—

The following table sets forth a summary of stock-settled stock appreciation rights for the nine months ended September 30, 2022:


	Awards	Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (In years)	Aggregate Intrinsic Value (In thousands)
Outstanding at December 31, 2021	1,370,388	$	62.09
Granted	—	—
Exercised	(101,076)	61.79
Forfeited	(8,891)	73.35
Outstanding at September 30, 2022	1,260,421	$	62.03	5.4	$	72,283
Exercisable at September 30, 2022	1,095,626	$	61.92	5.1	$	62,959

For the nine months ended September 30, 2022, the aggregate intrinsic value of stock-settled stock appreciation rights exercised during such period was $7.3 million.

The following table sets forth a summary of time-based restricted stock units for the nine months ended September 30, 2022:


	Awards	Weighted- Average Fair Value
Unvested at December 31, 2021	974,162	$	53.48
Granted	226,615	122.04
Vested	(382,954)	53.23
Forfeited	(35,118)	62.58
Unvested at September 30, 2022	782,705	$	73.04

The following table sets forth a summary of performance-based awards for the nine months ended September 30, 2022:


	Awards	Weighted- Average Fair Value
Unvested at December 31, 2021	380,819	$	59.23
Granted	83,991	122.09
Vested	(115,394)	54.64
Forfeited	(14,087)	60.75
Unvested at September 30, 2022	335,329	$	75.26

Wesco recognized $9.7 million and $9.6 million of non-cash stock-based compensation expense for the three months ended September 30, 2022 and 2021, respectively, and $34.4 million and $22.8 million for the nine months ended September 30, 2022 and 2021, respectively, which is included in selling, general and administrative expenses for all such periods. As of September 30, 2022, there was $58.2 million of total unrecognized compensation expense related to non-vested stock-based compensation arrangements for all awards previously made of which approximately $10.7 million is expected to be recognized over the remainder of 2022, $30.8 million in 2023, $14.9 million in 2024 and $1.8 million in 2025.

EARNINGS PER SHARE

9 Months Ended

Sep. 30, 2022

Earnings Per Share [Abstract]

EARNINGS PER SHARE

Basic earnings per share is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares outstanding during the periods. Diluted earnings per share is computed by dividing net income attributable to common stockholders by the weighted-average common shares and common share equivalents outstanding during the periods. The dilutive effect of common share equivalents is considered in the diluted earnings per share computation using the treasury stock method, which includes consideration of equity awards.

The following table sets forth the details of basic and diluted earnings per share:


	Three Months Ended				Nine Months Ended
	September 30				September 30
(In thousands, except per share data)	2022		2021		2022		2021
Net income attributable to WESCO International, Inc.	$	239,602	$	119,596	$	641,551	$	297,969
Less: Preferred stock dividends	14,352		14,352		43,056		43,056
Net income attributable to common stockholders	$	225,250	$	105,244	$	598,495	$	254,913
Weighted-average common shares outstanding used in computing basic earnings per share	50,815		50,386		50,711		50,252
Common shares issuable upon exercise of dilutive equity awards	1,574		1,677		1,675		1,644
Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share	52,389		52,063		52,386		51,896
Earnings per share attributable to common stockholders
Basic	$	4.43	$	2.09	$	11.80	$	5.07
Diluted	$	4.30	$	2.02	$	11.42	$	4.91

The computation of diluted earnings per share attributable to common stockholders excludes stock-based awards that would have had an antidilutive effect on earnings per share. For the three and nine months ended September 30, 2022, there were 88,896 and 88,071 antidilutive shares, respectively

DEBT (Notes)

9 Months Ended

Sep. 30, 2022

Debt Instrument [Line Items]

Debt Disclosure [Text Block]

7. DEBT

The following table sets forth Wesco's outstanding indebtedness:


	As of
	September 30, 2022		December 31, 2021
	(In thousands)
International lines of credit	$	6,659	$	7,354
Accounts Receivable Securitization Facility	1,525,000		1,270,000
Revolving Credit Facility	883,097		596,959
5.50% Anixter Senior Notes due 2023	58,636		58,636
6.00% Anixter Senior Notes due 2025	4,173		4,173
7.125% Senior Notes due 2025	1,500,000		1,500,000
7.250% Senior Notes due 2028, less debt discount of $7,155 and $8,088 in 2022 and 2021, respectively	1,317,845		1,316,912
Finance lease obligations	19,872		18,563
Total debt	5,315,282		4,772,597
Plus: Fair value adjustment to the Anixter Senior Notes	439		957
Less: Unamortized debt issuance costs	(53,610)		(62,484)
Less: Short-term debt and current portion of long-term debt(1)	(69,295)		(9,528)
Total long-term debt	$	5,192,816	$	4,701,542

(1) As of September 30, 2022, short-term debt and current portion of long-term debt includes the $58.6 million aggregate principal amount of the Company's 5.50% Anixter Senior Notes due 2023, which mature on March 1, 2023.

Accounts Receivable Securitization Facility

On March 1, 2022, WESCO Distribution, Inc. (“Wesco Distribution”) amended its accounts receivable securitization facility (the “Receivables Facility”) pursuant to the terms and conditions of a Fourth Amendment to Fifth Amended and Restated Receivables Purchase Agreement (the “Fourth Receivables Amendment”), by and among WESCO Receivables Corp., Wesco Distribution, the various purchaser groups from time to time party thereto and PNC Bank, National Association, as administrator. The Fourth Receivables Amendment modified the receivables purchase agreement entered into on June 22, 2020 (the “Receivables Purchase Agreement”). The Fourth Receivables Amendment, among other things, (i) increased the purchase limit under the Receivables Facility from $1,300 million to $1,400 million, (ii) increased the aggregate commitment from $1,500 million to $1,750 million under an accordion feature that permits requests to increase the purchase limit, and (iii) extended the maturity date from June 1, 2024 to March 1, 2025. Additionally, the Fourth Receivables Amendment replaced the LIBOR interest rate option with Secured Overnight Financing Rate-based (“SOFR”) interest rate options, including term SOFR and daily simple SOFR, and decreased the interest rate spread from 1.15% to 1.10%. The commitment fee of the Receivables Facility were unchanged.

On August 2, 2022, Wesco Distribution further amended its Receivables Facility pursuant to the terms and conditions of a Fifth Amendment to Fifth Amended and Restated Receivables Purchase Agreement (the “Fifth Receivables Amendment”). The Fifth Receivables Amendment amends the Receivables Purchase Agreement to, among other things, increase the purchase limit under the Receivables Facility from $1,400 million to $1,525 million and to decrease the interest rate spread from 1.10% to 1.05%. The maturity date and commitment fee of the Receivables Facility were unchanged.

Under the Receivables Facility, Wesco Distribution sells, on a continuous basis, an undivided interest in all domestic accounts receivable to Wesco Receivables, a wholly owned special purpose entity (the “SPE”). The SPE sells, without recourse, a senior undivided interest in the receivables to financial institutions for cash while maintaining a subordinated undivided interest in the receivables, in the form of overcollateralization. Since Wesco Distribution maintains control of the transferred receivables, the transfers do not qualify for “sale” treatment. As a result, the transferred receivables remain on the balance sheet, and Wesco recognizes the related secured borrowing. Wesco Distribution has agreed to continue servicing the sold receivables for the third-party conduits and financial institutions at market rates; accordingly, no servicing asset or liability has been recorded.

Revolving Credit Facility

On March 1, 2022, Wesco Distribution amended its revolving credit facility (the “Revolving Credit Facility”) pursuant to the terms and conditions of a Second Amendment to Fourth Amended and Restated Credit Agreement (the “Second Revolver Amendment”), by and among Wesco Distribution, as the borrower representative, the other U.S. borrowers party thereto, WESCO Distribution Canada LP, the other Canadian borrowers party thereto, WESCO International, the lenders party thereto and Barclays Bank PLC, as the administrative agent. The Second Revolver Amendment modified the revolving credit facility entered into on June 22, 2020 (the "Revolving Credit Agreement"). The Second Revolver Amendment, among other things, (i) increased the revolving commitments under the Revolving Credit Facility from $1,200 million to $1,350 million, (ii) increased the sub-facility for loans denominated in Canadian dollars from $500 million to $550 million, (iii) increased the capacity to request increases in the aggregate revolving commitments from $400 million to $650 million, (iv) modified certain negative covenants to provide for additional flexibility, and (v) extended the maturity date from June 22, 2025 to March 1, 2027. Additionally, the Second Revolver Amendment replaced the LIBOR-based interest rate option with SOFR-based interest rate options, including term SOFR and daily simple SOFR. The applicable interest rate for borrowings under the Revolving Credit Facility, as amended, includes interest rate spreads based on available borrowing capacity that range from 1.00% to 1.50% for SOFR-based borrowings and from 0.00% to 0.50% for prime rate-based borrowings

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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+ Details

EMPLOYEE BENEFIT PLANS (Notes)

9 Months Ended

Sep. 30, 2022

Retirement Benefits [Abstract]

EMPLOYEE BENEFIT PLANS

8. EMPLOYEE BENEFIT PLANS

Defined Contribution Plans

Wesco Distribution sponsors a defined contribution retirement savings plan for the majority of its U.S. employees (the "WESCO Distribution, Inc. Retirement Savings Plan"). Effective January 1, 2022, the defined contribution plan covering all of Anixter Inc.'s non-union U.S. employees (the "Anixter Inc. Employee Savings Plan") was merged with and into the WESCO Distribution, Inc. Retirement Savings Plan (the "U.S. Defined Contribution Plan Merger"). On December 31, 2021, participant account balances were transferred from the Anixter Inc. Employee Savings Plan to the WESCO Distribution, Inc. Retirement Savings Plan. In connection with the U.S. Defined Contribution Plan Merger, the WESCO Distribution, Inc. Retirement Savings Plan was amended to change the employer matching contribution at an amount equal to 100% of a participant's eligible elective deferrals up to 3% of the participant's eligible compensation and 50% of the next 4% of eligible compensation, and to eliminate discretionary employer contributions.

WESCO Distribution Canada LP, a wholly-owned subsidiary of the Company, sponsors a defined contribution plan covering the current full-time employees of WESCO Distribution Canada LP and part-time employees meeting certain requirements for continuous service, earnings and minimum hours of employment (the "Wesco Canadian Defined Contribution Plan"). Effective January 1, 2022, the defined contribution plan for certain employees of Anixter Canada Inc. and Anixter Power Solutions Canada Inc. (the "Anixter Canadian Defined Contribution Plan") was merged with and into an amended Wesco Canadian Defined Contribution Plan. During the first quarter of 2022, participant account balances were transferred from the Anixter Canadian Defined Contribution Plan to the amended Wesco Canadian Defined Contribution Plan. The amended Wesco Canadian Defined Contribution Plan provides a core employer contribution of 3% of a participant's eligible compensation, plus a matching contribution equal to 50% of a participant's elective contributions up to 4% of eligible compensation (for a maximum total employer contribution equal to 5%). The amended Wesco Canadian Defined Contribution Plan also requires employees of EECOL Electric Corp. hired on or after January 1, 2022 to join this Canadian defined contribution plan, and permits enrollment for those not participating in the defined benefit plan described below.

Wesco incurred charges of $12.4 million and $16.4 million for the three months ended September 30, 2022 and 2021, respectively, and $45.4 million and $49.1 million for the nine months ended September 30, 2022 and 2021, respectively, for all defined contribution plans.

Deferred Compensation Plans

Wesco Distribution sponsors a non-qualified deferred compensation plan (the "Wesco Deferred Compensation Plan") that permits select employees to make pre-tax deferrals of salary and bonus. Employees have the option to transfer balances allocated to their accounts in the Wesco Deferred Compensation Plan into any of the available investment options. The Wesco Deferred Compensation Plan is an unfunded plan. As of September 30, 2022 and December 31, 2021, the Company's obligation under the Wesco Deferred Compensation Plan was $19.6 million and $20.9 million, respectively, which is included in other noncurrent liabilities in the Condensed Consolidated Balance Sheets.

Defined Benefit Plans

Wesco sponsors a contributory defined benefit plan covering substantially all Canadian employees of EECOL Electric Corp., a wholly-owned subsidiary of the Company (the "EECOL Plan") and a Supplemental Executive Retirement Plan for certain executives of EECOL Electric Corp. (the "EECOL SERP").

Anixter Inc. sponsors the Anixter Inc. Pension Plan, which was closed to entrants first hired or rehired on or after July 1, 2015, and various defined benefit pension plans covering employees of foreign subsidiaries in Canada and Europe (together with the "EECOL Plan" and "EECOL SERP", the "Foreign Plans"). The majority of the Company's defined benefit pension plans are non-contributory, and with the exception of the U.S. and Canada, cover substantially all full-time employees in their respective countries. Retirement benefits are provided based on compensation as defined in each of the plan agreements. The Anixter Inc. Pension Plan is funded as required by the Employee Retirement Income Security Act of 1974 and the Internal Revenue Service. With the exception of the EECOL SERP, which is an unfunded plan, the Foreign Plans are funded as required by applicable foreign laws.

During the fourth quarter of 2021, the Company adopted certain plan amendments to: (i) freeze the benefits provided under the Anixter Inc. Pension Plan effective December 31, 2021, (ii) close participation in the EECOL Plan and EECOL SERP effective December 31, 2021, and (iii) freeze the benefit accruals under the Pension Plan for Employees of Anixter Canada Inc., the EECOL Plan and the EECOL SERP effective December 31, 2023.

The Company expects to contribute approximately $10.8 million to its Foreign Plans in 2022, of which approximately $9.3 million was contributed during the nine months ended September 30, 2022. The Company does not expect to make a contribution to its domestic qualified pension plan in 2022 due to its overfunded status.

The following tables set forth the components of net periodic pension (benefit) cost for the Company's defined benefit plans:


	Three Months Ended
(In thousands)	September 30, 2022		September 30, 2021		September 30, 2022		September 30, 2021		September 30, 2022		September 30, 2021
	Domestic Plans				Foreign Plans				Total
Service cost	$	—	$	764	$	2,047	$	3,251	$	2,047	$	4,015
Interest cost	2,083		2,018		2,174		2,465		4,257		4,483
Expected return on plan assets	(3,497)		(4,414)		(4,017)		(4,277)		(7,514)		(8,691)
Recognized actuarial gain(1)	—		—		(179)		103		(179)		103
Net periodic pension (benefit) cost	$	(1,414)	$	(1,632)	$	25	$	1,542	$	(1,389)	$	(90)


	Nine Months Ended
(In thousands)	September 30, 2022		September 30, 2021		September 30, 2022		September 30, 2021		September 30, 2022		September 30, 2021
	Domestic Plans				Foreign Plans				Total
Service cost	$	—	$	2,291	$	6,318	$	9,791	$	6,318	$	12,082
Interest cost	6,250		6,095		6,742		7,425		12,992		13,520
Expected return on plan assets	(10,491)		(13,241)		(12,468)		(12,898)		(22,959)		(26,139)
Recognized actuarial gain(1)	—		—		(547)		311		(547)		311
Settlement	—		(19)		—		—		—		(19)
Net periodic pension (benefit) cost	$	(4,241)	$	(4,874)	$	45	$	4,629	$	(4,196)	$	(245)

(1) For the three and nine months ended September 30, 2022 and 2021, no material amounts were reclassified from accumulated other comprehensive income into net income.

The service cost of $2.0 million and $4.0 million for the three months ended September 30, 2022 and 2021, respectively, and $6.3 million and $12.1 million for the nine months ended September 30, 2022 and 2021, respectively, is reported as a component of selling, general and administrative expenses. The other components of net periodic pension (benefit) cost totaling net benefits of $3.4 million and $4.1 million for the three months ended September 30, 2022 and 2021, respectively, and $10.5 million and $12.3 million for the nine months ended September 30, 2022 and 2021, respectively, are presented as components of other non-operating income ("other expense (income), net").

Other Benefits

Prior to its acquisition by Wesco on June 22, 2020, Anixter granted restricted stock units in the ordinary course of business to its employees and directors. These awards, for which vesting did not accelerate solely as a result of the Company's merger with Anixter, were converted into cash-only settled Wesco phantom stock units, which vest ratably over a 3-year period. As of September 30, 2022 and December 31, 2021, the estimated fair value of these awards was $7.9 million and $22.7 million, respectively.

As of September 30, 2022, the Company's liability for these awards is $7.1 million, which is included in accrued payroll and benefit costs in the Condensed Consolidated Balance Sheet. As of December 31, 2021, the Company's liability for these awards was $17.3 million, of which $10.9 million was included in accrued payroll and benefit costs and $6.4 million was a component of other noncurrent liabilities in the Condensed Consolidated Balance Sheet.

The Company recognized compensation expense associated with these awards of $1.8 million and $3.4 million for the three months ended September 30, 2022 and 2021, respectively, and $1.6 million and $9.8 million for the nine months ended September 30, 2022 and 2021, respectively, which is reported as a component of selling, general and administrative expenses.

Compensation Related Costs, General

Other Benefits

- Definition

The entire disclosure for retirement benefits.

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+ Details

FAIR VALUE (Notes)	9 Months Ended
FAIR VALUE (Notes)	Sep. 30, 2022
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	9. FAIR VALUE OF FINANCIAL INSTRUMENTS The Company’s financial instruments primarily consist of cash and cash equivalents, accounts receivable, accounts payable, bank overdrafts, outstanding indebtedness, foreign currency forward contracts, and benefit plan assets. Except for benefit plan assets, outstanding indebtedness and foreign currency forward contracts, the carrying value of the Company’s remaining financial instruments approximates fair value. The assets of the Company's various defined benefit plans are primarily comprised of common/collective/pool funds (i.e., mutual funds). These funds are valued at the net asset value (NAV) of shares held in the underlying funds. Investments for which fair value is measured using the NAV per share practical expedient are not classified in the fair value hierarchy. The Company uses a market approach to determine the fair value of its debt instruments, utilizing quoted prices in active markets, interest rates and other relevant information generated by market transactions involving similar instruments. Therefore, the inputs used to measure the fair value of the Company's debt instruments are classified as Level 2 within the fair value hierarchy. The carrying value of Wesco's debt instruments with fixed interest rates was $2,881.1 million and $2,880.7 million as of September 30, 2022 and December 31, 2021, respectively. The estimated fair value of this debt was $2,866.5 million and $3,118.0 million as of September 30, 2022 and December 31, 2021, respectively. The reported carrying values of Wesco's other debt instruments, including those with variable interest rates, approximated their fair values as of September 30, 2022 and December 31, 2021. The Company purchases foreign currency forward contracts to minimize the effect of fluctuations in foreign currency-denominated accounts on its earnings. The foreign currency forward contracts are not designated as hedges for accounting purposes. The Company's strategy is to negotiate terms for its derivatives and other financial instruments to be highly effective, such that the change in the value of the derivative offsets the impact of the underlying hedge. Its counterparties to foreign currency forward contracts have investment-grade credit ratings. The Company regularly monitors the creditworthiness of its counterparties to ensure no issues exist that could affect the value of its derivatives. The Company does not hedge 100% of its foreign currency-denominated accounts. In addition, the results of hedging can vary significantly based on various factors, such as the timing of executing foreign currency forward contracts versus the movement of currencies, as well as fluctuations in the account balances throughout each reporting period. The fair value of foreign currency forward contracts is based on the difference between the contract rate and the current price of a forward contract with an equivalent remaining term. The fair value of foreign currency forward contracts is measured using observable market information. These inputs are considered Level 2 in the fair value hierarchy. At September 30, 2022 and December 31, 2021, foreign currency forward contracts were revalued at then-current foreign exchange rates with the changes in valuation reflected directly in other non-operating income (expense) in the Condensed Consolidated Statements of Income and Comprehensive Income offsetting the transaction gain (loss) recorded on foreign currency-denominated accounts. At September 30, 2022 and December 31, 2021, the gross and net notional amounts of foreign currency forward contracts outstanding were approximately $224.3 million and $188.6 million, respectively. While all of the Company's foreign currency forward contracts are subject to master netting arrangements with its counterparties, assets and liabilities related to these contracts are presented on a gross basis within the Condensed Consolidated Balance Sheets. The gross fair value of assets and liabilities related to foreign currency forward contracts were immaterial.
Derivatives and Fair Value	The Company purchases foreign currency forward contracts to minimize the effect of fluctuations in foreign currency-denominated accounts on its earnings. The foreign currency forward contracts are not designated as hedges for accounting purposes. The Company's strategy is to negotiate terms for its derivatives and other financial instruments to be highly effective, such that the change in the value of the derivative offsets the impact of the underlying hedge. Its counterparties to foreign currency forward contracts have investment-grade credit ratings. The Company regularly monitors the creditworthiness of its counterparties to ensure no issues exist that could affect the value of its derivatives. The Company does not hedge 100% of its foreign currency-denominated accounts. In addition, the results of hedging can vary significantly based on various factors, such as the timing of executing foreign currency forward contracts versus the movement of currencies, as well as fluctuations in the account balances throughout each reporting period. The fair value of foreign currency forward contracts is based on the difference between the contract rate and the current price of a forward contract with an equivalent remaining term. The fair value of foreign currency forward contracts is measured using observable market information. These inputs are considered Level 2 in the fair value hierarchy. At September 30, 2022 and December 31, 2021, foreign currency forward contracts were revalued at then-current foreign exchange rates with the changes in valuation reflected directly in other non-operating income (expense) in the Condensed Consolidated Statements of Income and Comprehensive Income offsetting the transaction gain (loss) recorded on foreign currency-denominated accounts. At September 30, 2022 and December 31, 2021, the gross and net notional amounts of foreign currency forward contracts outstanding were approximately $224.3 million and $188.6 million, respectively. While all of the Company's foreign currency forward contracts are subject to master netting arrangements with its counterparties, assets and liabilities related to these contracts are presented on a gross basis within the Condensed Consolidated Balance Sheets. The gross fair value of assets and liabilities related to foreign currency forward contracts were immaterial.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

COMMITMENTS AND CONTINGENCIES	9 Months Ended
COMMITMENTS AND CONTINGENCIES	Sep. 30, 2022
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	From time to time, a number of lawsuits and claims have been or may be asserted against the Company relating to the conduct of its business, including litigation relating to commercial, product and employment matters (including wage and hour). The outcome of any litigation cannot be predicted with certainty, and some lawsuits may be determined adversely to Wesco. However, management does not believe that the ultimate outcome of any such pending matters is likely to have a material adverse effect on Wesco's financial condition or liquidity, although the resolution in any fiscal period of one or more of these matters may have a material adverse effect on Wesco's results of operations for that period.

INCOME TAXES	9 Months Ended
INCOME TAXES	Sep. 30, 2021
Income Tax Disclosure [Abstract]
INCOME TAXES	The effective tax rate for the three and nine months ended September 30, 2022 was 26.3% and 24.0%, respectively. The effective tax rate for the three and nine months ended September 30, 2021 was 27.2% and 22.0%, respectively. Wesco’s effective tax rate typically differs from the federal statutory income tax rate due to the tax effect of intercompany financing, foreign tax rate differences, the U.S. taxes imposed on foreign income, nondeductible expenses and state income taxes. For the three months ended September 30, 2022 and 2021, the effective tax rate reflects discrete income tax benefits of $3.2 million and $3.3 million, respectively, resulting from the exercise and vesting of stock-based awards. These discrete income tax benefits were offset by discrete income tax expense of $0.8 million and $4.2 million, respectively, resulting from return-to-provision adjustments. The net impact of discrete income tax items was a reduction to the estimated annual effective tax rate of approximately 0.7 percentage points for the three months ended September 30, 2022 and an increase of 0.7 percentage points for the three months ended September 30, 2021. For the nine months ended September 30, 2022 and 2021, the effective tax rate reflects discrete income tax benefits of $13.4 million and $8.3 million, respectively, resulting from reductions to the valuation allowance recorded against foreign tax credit carryforwards, as well as the exercise and vesting of stock-based awards of $9.4 million and $7.8 million, respectively. These discrete income tax benefits were partially offset by discrete income tax expense of $0.8 million and $4.2 million, respectively, resulting from return-to-provision adjustments. The net impact of discrete income tax items was a reduction to the estimated annual effective tax rate in such periods of approximately 2.6 and 3.1 percentage points, respectively. There have been no material adjustments to liabilities for uncertain tax positions since December 31, 2021.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

Segment Reporting

9 Months Ended

Sep. 30, 2022

Segment Reporting [Abstract]

Segment Reporting Disclosure

12. BUSINESS SEGMENTS

The Company has operating segments comprising three strategic business units consisting of EES, CSS and UBS. These operating segments are equivalent to the Company's reportable segments. The Company's chief operating decision maker evaluates the performance of its operating segments based primarily on net sales, adjusted earnings before interest, taxes, depreciation and amortization ("EBITDA"), and adjusted EBITDA margin percentage.

The Company incurs corporate costs primarily related to treasury, tax, information technology, legal and other centralized functions. The Company also has various corporate assets. Segment assets may not include jointly used assets, but segment results include depreciation expense or other allocations related to those assets. Interest expense and other non-operating items are either not allocated to the segments or reviewed on a segment basis. Corporate expenses and assets not directly identifiable with a reportable segment are reported in the tables below to reconcile the reportable segments to the consolidated financial statements.


(In thousands)	Three Months Ended September 30, 2022
	EES			CSS			UBS			Corporate		Total
Net sales	$	2,234,771		$	1,602,459		$	1,608,686		$	—	$	5,445,916
Adjusted EBITDA	225,764			156,370			186,257			(102,495)		465,896
Adjusted EBITDA Margin %	10.1		%	9.8		%	11.6		%			8.6		%

	Three Months Ended September 30, 2021
(In thousands)	EES			CSS			UBS			Corporate		Total
Net sales	$	1,982,485		$	1,488,689		$	1,257,151		$	—	$	4,728,325
Adjusted EBITDA	173,898			133,701			114,674			(92,013)		330,260
Adjusted EBITDA Margin %	8.8		%	9.0		%	9.1		%			7.0		%


(In thousands)	Nine Months Ended September 30, 2022
	EES			CSS			UBS			Corporate		Total
Net sales	$	6,654,883		$	4,638,631		$	4,568,108		$	—	$	15,861,622
Adjusted EBITDA	653,630			429,452			491,652			(300,256)		1,274,478
Adjusted EBITDA Margin %	9.8		%	9.3		%	10.8		%			8.0		%

	Nine Months Ended September 30, 2021
(In thousands)	EES			CSS			UBS			Corporate		Total
Net sales	$	5,626,309		$	4,200,424		$	3,538,859		$	—	$	13,365,592
Adjusted EBITDA	453,894			355,521			299,030			(252,391)		856,054
Adjusted EBITDA Margin %	8.1		%	8.5		%	8.4		%			6.4		%

The following table sets forth total assets by reportable segment for the periods presented:


	As of
	September 30, 2022
(In thousands)	EES		CSS		UBS		Corporate(1)		Total
Total assets	$	4,541,553	$	4,988,009	$	3,817,459	$	733,543	$	14,080,564

	As of
	December 31, 2021
(In thousands)	EES		CSS		UBS		Corporate(1)		Total
Total assets	$	4,098,335	$	4,601,132	$	3,266,231	$	652,001	$	12,617,699

(1) Total assets for Corporate primarily consist of cash and cash equivalents, deferred income taxes, fixed assets and right-of-use assets associated with operating leases.

The following tables reconcile net income attributable to common stockholders to adjusted EBITDA and adjusted EBITDA margin % by segment, which are non-GAAP financial measures, for the periods presented:


	Three Months Ended September 30, 2022
(In thousands)	EES			CSS			UBS			Corporate		Total
Net income attributable to common stockholders	$	214,054		$	138,747		$	180,354		$	(307,905)	$	225,250
Net income attributable to noncontrolling interests	200			—			—			408		608
Preferred stock dividends	—			—			—			14,352		14,352
Provision for income taxes	—			—			—			85,637		85,637
Interest expense, net	—			—			—			75,057		75,057
Depreciation and amortization	9,596			15,929			5,859			11,339		42,723
Other (income) expense, net	(1,069)			266			(1,063)			2,554		688
Stock-based compensation expense(1)	2,983			1,428			1,107			2,853		8,371
Merger-related and integration costs	—			—			—			13,210		13,210
Adjusted EBITDA	$	225,764		$	156,370		$	186,257		$	(102,495)	$	465,896
Adjusted EBITDA margin %	10.1		%	9.8		%	11.6		%			8.6		%
(1) Stock-based compensation expense in the calculation of adjusted EBITDA for the three months ended September 30, 2022 excludes $1.3 million as such amount is included in merger-related and integration costs.


	Three Months Ended September 30, 2021
(In thousands)	EES			CSS			UBS			Corporate		Total
Net income attributable to common stockholders	$	155,627		$	107,898		$	108,150		$	(266,431)	$	105,244
Net income attributable to noncontrolling interests	309			—			—			291		600
Preferred stock dividends	—			—			—			14,352		14,352
Provision for income taxes	—			—			—			44,870		44,870
Interest expense, net	—			—			—			69,720		69,720
Depreciation and amortization	16,840			24,723			5,869			9,300		56,732
Other (income) expense, net	(726)			328			22			(4,944)		(5,320)
Stock-based compensation expense(1)	1,848			752			633			5,079		8,312
Merger-related and integration costs	—			—			—			35,750		35,750
Adjusted EBITDA	$	173,898		$	133,701		$	114,674		$	(92,013)	$	330,260
Adjusted EBITDA margin %	8.8		%	9.0		%	9.1		%			7.0		%
(1) Stock-based compensation expense in the calculation of adjusted EBITDA for the three months ended September 30, 2021 excludes $1.3 million as such amount is included in merger-related and integration costs.


	Nine Months Ended September 30, 2022
(In thousands)	EES			CSS			UBS			Corporate		Total
Net income attributable to common stockholders	$	615,547		$	373,073		$	472,119		$	(862,244)	$	598,495
Net income attributable to noncontrolling interests	561			—			—			878		1,439
Preferred stock dividends	—			—			—			43,056		43,056
Provision for income taxes	—			—			—			203,178		203,178
Interest expense, net	—			—			—			207,155		207,155
Depreciation and amortization	32,818			51,916			17,315			33,520		135,569
Other (income) expense, net	(2,646)			716			(452)			5,389		3,007
Stock-based compensation expense(1)	7,350			3,747			2,670			16,612		30,379
Merger-related and integration costs	—			—			—			52,200		52,200
Adjusted EBITDA	$	653,630		$	429,452		$	491,652		$	(300,256)	$	1,274,478
Adjusted EBITDA margin %	9.8		%	9.3		%	10.8		%			8.0		%
(1) Stock-based compensation expense in the calculation of adjusted EBITDA for the nine months ended September 30, 2022 excludes $4.1 million as such amount is included in merger-related and integration costs.


	Nine Months Ended September 30, 2021
(In thousands)	EES			CSS			UBS			Corporate		Total
Net income attributable to common stockholders	$	410,233		$	292,537		$	289,851		$	(737,708)	$	254,913
Net income attributable to noncontrolling interests	158			—			—			507		665
Preferred stock dividends	—			—			—			43,056		43,056
Provision for income taxes	—			—			—			84,201		84,201
Interest expense, net	—			—			—			207,683		207,683
Depreciation and amortization	40,184			60,257			16,545			27,659		144,645
Other (income) expense, net	(1,329)			909			44			(8,553)		(8,929)
Stock-based compensation expense(1)	4,648			1,818			1,517			10,972		18,955
Merger-related and integration costs	—			—			—			119,792		119,792
Net gain on divestitures	—			—			(8,927)			—		(8,927)
Adjusted EBITDA	$	453,894		$	355,521		$	299,030		$	(252,391)	$	856,054
Adjusted EBITDA margin %	8.1		%	8.5		%	8.4		%			6.4		%
(1) Stock-based compensation expense in the calculation of adjusted EBITDA for the nine months ended September 30, 2021 excludes $3.8 million as such amount is included in merger-related and integration costs.

Note: Adjusted EBITDA and Adjusted EBITDA margin % are non-GAAP financial measures that provide indicators of the Company's performance and its ability to meet debt service requirements. Adjusted EBITDA is defined as EBITDA before other non-operating expenses (income), non-cash stock-based compensation expense, merger-related and integration costs, and net gain on the divestiture of Wesco's legacy utility and data communications businesses in Canada. Adjusted EBITDA margin % is calculated by dividing Adjusted EBITDA by net sales.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2022
Subsequent Events [Abstract]
Subsequent Events [Text Block]	13. SUBSEQUENT EVENTS On October 27, 2022, the Company provided notice to participants in the Anixter Inc. Pension Plan of its intention to terminate such plan effective December 31, 2022. The Company will incorporate certain estimates that reflect the pending settlement in the assumptions used to measure the projected benefit obligation associated with this plan at the next measurement date as of December 31, 2022. The Company does not expect the termination to result in any curtailment gain or loss as the Anixter Inc. Pension Plan had previously been frozen during the fourth quarter of 2021. The Company anticipates that the assets held by the plan are sufficient to satisfy all benefit obligations upon termination. On October 31, 2022, Wesco Distribution amended its Receivables Facility to increase the purchase limit from $1,525 million to $1,625 million. Also on October 31, 2022, Wesco Distribution amended its Revolving Credit Facility to increase the revolving commitments from $1,525 million to $1,725 million and to increase the sub-facility for loans denominated in Canadian dollars from $600 million to $625 million. On November 1, 2022, through its wholly-owned subsidiary Wesco Distribution, the Company closed its acquisition of Rahi Systems Holdings, Inc., a leading provider of global hyperscale data center solutions headquartered in Fremont, California. Wesco funded the purchase price paid at closing of $217 million with cash, and borrowings under the Receivables Facility and the Revolving Credit Facility. Due to the timing of the close of the acquisition, the Company will complete its preliminary purchase price allocation during the fourth quarter of 2022.

ACCOUNTING POLICIES (Policies)	9 Months Ended
ACCOUNTING POLICIES (Policies)	Sep. 30, 2022
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited Condensed Consolidated Financial Statements of Wesco have been prepared in accordance with Rule 10-01 of Regulation S-X of the Securities and Exchange Commission (the “SEC”). The unaudited condensed consolidated financial information should be read in conjunction with the audited Consolidated Financial Statements and Notes thereto included in WESCO International, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2021, as filed with the SEC on February 25, 2022. The Condensed Consolidated Balance Sheet at December 31, 2021 was derived from the audited Consolidated Financial Statements as of that date, but does not include all of the disclosures required by accounting principles generally accepted in the United States of America. The unaudited Condensed Consolidated Balance Sheet as of September 30, 2022, the unaudited Condensed Consolidated Statements of Income and Comprehensive Income and the unaudited Condensed Consolidated Statements of Stockholders' Equity for the three and nine months ended September 30, 2022, and 2021, and the unaudited Condensed Consolidated Statements of Cash Flows for the nine months ended September 30, 2022, and 2021, respectively, in the opinion of management, have been prepared on the same basis as the audited Consolidated Financial Statements and include all adjustments necessary for the fair statement of the results of the interim periods presented herein. All adjustments reflected in the unaudited condensed consolidated financial information are of a normal recurring nature unless indicated. The results for the interim periods presented herein are not necessarily indicative of the results to be expected for the full year.
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]	Recently Adopted and Recently Issued Accounting Standards In March 2020, the Financial Accounting Standards Board (the "FASB") issued Accounting Standards Update ("ASU") 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting, which provides optional guidance for a limited period of time to ease the potential burden in accounting for (or recognizing the effects of) reference rate reform on financial reporting. The amendments in this ASU are effective for all entities as of March 12, 2020 through December 31, 2022. The Company adopted this ASU during the first quarter of 2022 in connection with amending Wesco's credit facilities, as disclosed in Note 7, "Debt". The replacement of London Interbank Offered Rate ("LIBOR") and the related adoption of the optional guidance under this accounting standard did not have a material impact on the Company's consolidated financial statements and notes thereto.
New Accounting Pronouncements, Policy	Recently Adopted and Recently Issued Accounting Standards In March 2020, the Financial Accounting Standards Board (the "FASB") issued Accounting Standards Update ("ASU") 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting, which provides optional guidance for a limited period of time to ease the potential burden in accounting for (or recognizing the effects of) reference rate reform on financial reporting. The amendments in this ASU are effective for all entities as of March 12, 2020 through December 31, 2022. The Company adopted this ASU during the first quarter of 2022 in connection with amending Wesco's credit facilities, as disclosed in Note 7, "Debt". The replacement of London Interbank Offered Rate ("LIBOR") and the related adoption of the optional guidance under this accounting standard did not have a material impact on the Company's consolidated financial statements and notes thereto. In October 2021, the FASB issued ASU 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers, which requires contract assets and contract liabilities acquired in a business combination to be recognized and measured by the acquirer on the acquisition date in accordance with ASC Topic 606, Revenue from Contracts with Customers, as if the acquirer had originated the contracts. The amendments in this ASU are effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years. Management is currently evaluating the impact that the adoption of this accounting standard will have on its consolidated financial statements and notes thereto. In September 2022, the FASB issued ASU 2022-04, Supplier Finance Programs (Subtopic 405-50): Disclosure of Supplier Finance Program Obligations, which requires that a buyer in a supplier finance program disclose sufficient information about the program to allow a user of financial statements to understand the program's nature, activity during the period, changes from period to period, and potential magnitude. The amendments in this ASU are effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years, except for the amendment on rollforward information, which is effective for fiscal years beginning after December 15, 2023. Early adoption is permitted. Management is currently evaluating the impact that the adoption of this accounting standard will have on its consolidated financial statements and notes thereto. Other pronouncements issued by the FASB or other authoritative accounting standards groups with future effective dates are either not applicable or are not expected to be significant to Wesco’s financial position, results of operations or cash flows.

- Definition

+ References

+ Details

REVENUE (Tables)

9 Months Ended

Sep. 30, 2022

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue [Table Text Block]

The following tables disaggregate Wesco’s net sales by segment and geography for the periods presented:


	Three Months Ended				Nine Months Ended
	September 30				September 30
(In thousands)	2022		2021		2022		2021
Electrical & Electronic Solutions	$	2,234,771	$	1,982,485	$	6,654,883	$	5,626,309
Communications & Security Solutions	1,602,459		1,488,689		4,638,631		4,200,424
Utility & Broadband Solutions	1,608,686		1,257,151		4,568,108		3,538,859
Total by segment	$	5,445,916	$	4,728,325	$	15,861,622	$	13,365,592


	Three Months Ended				Nine Months Ended
	September 30				September 30
(In thousands)	2022		2021		2022		2021
United States	$	4,050,924	$	3,407,437	$	11,745,090	$	9,656,183
Canada	765,281		709,507		2,288,146		2,020,395
Other International(1)	629,711		611,381		1,828,386		1,689,014
Total by geography(2)	$	5,445,916	$	4,728,325	$	15,861,622	$	13,365,592

GOODWILL (Tables)

9 Months Ended

Sep. 30, 2022

Goodwill [Line Items]

Schedule of Goodwill [Table Text Block]


	Nine Months Ended
	September 30, 2022
	EES		CSS		UBS		Total
	(In thousands)
Beginning balance, January 1	$	860,958	$	1,121,712	$	1,225,663	$	3,208,333
Foreign currency exchange rate changes	(44,301)		(14,449)		(26,153)		(84,903)
Ending balance, September 30	$	816,657	$	1,107,263	$	1,199,510	$	3,123,430

Schedule of Finite-Lived Intangible Assets

The components of intangible assets are as follows:


		As of
		September 30, 2022						December 31, 2021
	Life (in years)	Gross Carrying Amount (1)		Accumulated Amortization (1)		Net Carrying Amount		Gross Carrying Amount (1)		Accumulated Amortization (1)		Net Carrying Amount
Intangible assets:		(In thousands)
Trademarks	Indefinite	$	791,228	$	—	$	791,228	$	795,065	$	—	$	795,065
Customer relationships	10 - 20	1,400,841		(352,638)		1,048,203		1,431,251		(308,180)		1,123,071
Distribution agreements	15 - 19	29,212		(23,936)		5,276		29,212		(22,714)		6,498
Trademarks	5 - 12	15,543		(6,799)		8,744		38,758		(20,058)		18,700
Non-compete agreements	2	—		—		—		4,300		(3,493)		807
		$	2,236,824	$	(383,373)	$	1,853,451	$	2,298,586	$	(354,445)	$	1,944,141

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

The following table sets forth the remaining estimated amortization expense for intangible assets for the next five years and thereafter:


For the year ending December 31,	(In thousands)
2022	$	20,467
2023	81,838
2024	79,445
2025	76,389
2026	71,073
Thereafter	733,011

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References

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Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details

STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2022

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]


	Three Months Ended				Nine Months Ended
	September 30, 2022		September 30, 2021		September 30, 2022		September 30, 2021
Stock options granted	3,249		—		92,799		—
Weighted-average fair value	$	54.13	$	—	$	57.15	$	—

Stock-settled stock appreciation rights granted	—		—		—		139,592
Weighted-average fair value	$	—	$	—	$	—	$	33.19

Restricted stock units granted	1,669		6,897		226,615		314,480
Weighted-average fair value	$	112.33	$	108.76	$	122.04	$	77.81

Performance-based awards granted	—		—		83,991		122,812
Weighted-average fair value	$	—	$	—	$	122.09	$	76.76

Share-based Payment Arrangement, Option and Stock Appreciation Rights, Activity [Table Text Block]

The following table sets forth a summary of stock-settled stock appreciation rights for the nine months ended September 30, 2022:


	Awards	Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (In years)	Aggregate Intrinsic Value (In thousands)
Outstanding at December 31, 2021	1,370,388	$	62.09
Granted	—	—
Exercised	(101,076)	61.79
Forfeited	(8,891)	73.35
Outstanding at September 30, 2022	1,260,421	$	62.03	5.4	$	72,283
Exercisable at September 30, 2022	1,095,626	$	61.92	5.1	$	62,959

For the nine months ended September 30, 2022, the aggregate intrinsic value of stock-settled stock appreciation rights exercised during such period was $7.3 million.

Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]

The following table sets forth a summary of time-based restricted stock units for the nine months ended September 30, 2022:


	Awards	Weighted- Average Fair Value
Unvested at December 31, 2021	974,162	$	53.48
Granted	226,615	122.04
Vested	(382,954)	53.23
Forfeited	(35,118)	62.58
Unvested at September 30, 2022	782,705	$	73.04

Schedule of Nonvested Performance-based Units Activity [Table Text Block]

The following table sets forth a summary of performance-based awards for the nine months ended September 30, 2022:


	Awards	Weighted- Average Fair Value
Unvested at December 31, 2021	380,819	$	59.23
Granted	83,991	122.09
Vested	(115,394)	54.64
Forfeited	(14,087)	60.75
Unvested at September 30, 2022	335,329	$	75.26

Stock Appreciation Rights (SARs) [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]


	Three Months Ended			Nine Months Ended
	September 30, 2022		September 30, 2021	September 30, 2022		September 30, 2021
Risk free interest rate	2.9	%	n/a	2.0	%	0.8	%
Expected life (in years)	7		n/a	7		7
Expected volatility	44	%	n/a	43	%	41	%

EARNINGS PER SHARE (Tables)

9 Months Ended

Sep. 30, 2022

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

The following table sets forth the details of basic and diluted earnings per share:


	Three Months Ended				Nine Months Ended
	September 30				September 30
(In thousands, except per share data)	2022		2021		2022		2021
Net income attributable to WESCO International, Inc.	$	239,602	$	119,596	$	641,551	$	297,969
Less: Preferred stock dividends	14,352		14,352		43,056		43,056
Net income attributable to common stockholders	$	225,250	$	105,244	$	598,495	$	254,913
Weighted-average common shares outstanding used in computing basic earnings per share	50,815		50,386		50,711		50,252
Common shares issuable upon exercise of dilutive equity awards	1,574		1,677		1,675		1,644
Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share	52,389		52,063		52,386		51,896
Earnings per share attributable to common stockholders
Basic	$	4.43	$	2.09	$	11.80	$	5.07
Diluted	$	4.30	$	2.02	$	11.42	$	4.91

DEBT (Tables)

9 Months Ended

Sep. 30, 2022

Debt Disclosure [Abstract]

Schedule of Debt

The following table sets forth Wesco's outstanding indebtedness:


	As of
	September 30, 2022		December 31, 2021
	(In thousands)
International lines of credit	$	6,659	$	7,354
Accounts Receivable Securitization Facility	1,525,000		1,270,000
Revolving Credit Facility	883,097		596,959
5.50% Anixter Senior Notes due 2023	58,636		58,636
6.00% Anixter Senior Notes due 2025	4,173		4,173
7.125% Senior Notes due 2025	1,500,000		1,500,000
7.250% Senior Notes due 2028, less debt discount of $7,155 and $8,088 in 2022 and 2021, respectively	1,317,845		1,316,912
Finance lease obligations	19,872		18,563
Total debt	5,315,282		4,772,597
Plus: Fair value adjustment to the Anixter Senior Notes	439		957
Less: Unamortized debt issuance costs	(53,610)		(62,484)
Less: Short-term debt and current portion of long-term debt(1)	(69,295)		(9,528)
Total long-term debt	$	5,192,816	$	4,701,542

EMPLOYEE BENEFIT PLANS Schedule of Net Benefit Costs (Tables)

9 Months Ended

Sep. 30, 2022

Postemployment Benefits [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

The following tables set forth the components of net periodic pension (benefit) cost for the Company's defined benefit plans:


	Three Months Ended
(In thousands)	September 30, 2022		September 30, 2021		September 30, 2022		September 30, 2021		September 30, 2022		September 30, 2021
	Domestic Plans				Foreign Plans				Total
Service cost	$	—	$	764	$	2,047	$	3,251	$	2,047	$	4,015
Interest cost	2,083		2,018		2,174		2,465		4,257		4,483
Expected return on plan assets	(3,497)		(4,414)		(4,017)		(4,277)		(7,514)		(8,691)
Recognized actuarial gain(1)	—		—		(179)		103		(179)		103
Net periodic pension (benefit) cost	$	(1,414)	$	(1,632)	$	25	$	1,542	$	(1,389)	$	(90)


	Nine Months Ended
(In thousands)	September 30, 2022		September 30, 2021		September 30, 2022		September 30, 2021		September 30, 2022		September 30, 2021
	Domestic Plans				Foreign Plans				Total
Service cost	$	—	$	2,291	$	6,318	$	9,791	$	6,318	$	12,082
Interest cost	6,250		6,095		6,742		7,425		12,992		13,520
Expected return on plan assets	(10,491)		(13,241)		(12,468)		(12,898)		(22,959)		(26,139)
Recognized actuarial gain(1)	—		—		(547)		311		(547)		311
Settlement	—		(19)		—		—		—		(19)
Net periodic pension (benefit) cost	$	(4,241)	$	(4,874)	$	45	$	4,629	$	(4,196)	$	(245)

(1) For the three and nine months ended September 30, 2022 and 2021, no material amounts were reclassified from accumulated other comprehensive income into net income.

Segment Reporting (Tables)

9 Months Ended

Sep. 30, 2022

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

The following tables set forth financial information by reportable segment for the periods presented:


(In thousands)	Three Months Ended September 30, 2022
	EES			CSS			UBS			Corporate		Total
Net sales	$	2,234,771		$	1,602,459		$	1,608,686		$	—	$	5,445,916
Adjusted EBITDA	225,764			156,370			186,257			(102,495)		465,896
Adjusted EBITDA Margin %	10.1		%	9.8		%	11.6		%			8.6		%

	Three Months Ended September 30, 2021
(In thousands)	EES			CSS			UBS			Corporate		Total
Net sales	$	1,982,485		$	1,488,689		$	1,257,151		$	—	$	4,728,325
Adjusted EBITDA	173,898			133,701			114,674			(92,013)		330,260
Adjusted EBITDA Margin %	8.8		%	9.0		%	9.1		%			7.0		%


(In thousands)	Nine Months Ended September 30, 2022
	EES			CSS			UBS			Corporate		Total
Net sales	$	6,654,883		$	4,638,631		$	4,568,108		$	—	$	15,861,622
Adjusted EBITDA	653,630			429,452			491,652			(300,256)		1,274,478
Adjusted EBITDA Margin %	9.8		%	9.3		%	10.8		%			8.0		%

	Nine Months Ended September 30, 2021
(In thousands)	EES			CSS			UBS			Corporate		Total
Net sales	$	5,626,309		$	4,200,424		$	3,538,859		$	—	$	13,365,592
Adjusted EBITDA	453,894			355,521			299,030			(252,391)		856,054
Adjusted EBITDA Margin %	8.1		%	8.5		%	8.4		%			6.4		%


	Three Months Ended September 30, 2022
(In thousands)	EES			CSS			UBS			Corporate		Total
Net income attributable to common stockholders	$	214,054		$	138,747		$	180,354		$	(307,905)	$	225,250
Net income attributable to noncontrolling interests	200			—			—			408		608
Preferred stock dividends	—			—			—			14,352		14,352
Provision for income taxes	—			—			—			85,637		85,637
Interest expense, net	—			—			—			75,057		75,057
Depreciation and amortization	9,596			15,929			5,859			11,339		42,723
Other (income) expense, net	(1,069)			266			(1,063)			2,554		688
Stock-based compensation expense(1)	2,983			1,428			1,107			2,853		8,371
Merger-related and integration costs	—			—			—			13,210		13,210
Adjusted EBITDA	$	225,764		$	156,370		$	186,257		$	(102,495)	$	465,896
Adjusted EBITDA margin %	10.1		%	9.8		%	11.6		%			8.6		%
(1) Stock-based compensation expense in the calculation of adjusted EBITDA for the three months ended September 30, 2022 excludes $1.3 million as such amount is included in merger-related and integration costs.

Reconciliation of Assets from Segment to Consolidated

The following table sets forth total assets by reportable segment for the periods presented:


	As of
	September 30, 2022
(In thousands)	EES		CSS		UBS		Corporate(1)		Total
Total assets	$	4,541,553	$	4,988,009	$	3,817,459	$	733,543	$	14,080,564

	As of
	December 31, 2021
(In thousands)	EES		CSS		UBS		Corporate(1)		Total
Total assets	$	4,098,335	$	4,601,132	$	3,266,231	$	652,001	$	12,617,699

(1) Total assets for Corporate primarily consist of cash and cash equivalents, deferred income taxes, fixed assets and right-of-use assets associated with operating leases.

REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
REVENUE (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Deferred Revenue	$ 55,500		$ 55,500		$ 35,500
Revenue from Contract with Customer, Excluding Assessed Tax	5,445,916	$ 4,728,325	15,861,622	$ 13,365,592
Cost of goods sold	4,241,401	3,720,332	12,418,561	10,581,406
Contract with Customer, Refund Liability	45,500		45,500		$ 38,800
EES
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,234,771	1,982,485	6,654,883	5,626,309
CSS
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,602,459	1,488,689	4,638,631	4,200,424
UBS
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,608,686	1,257,151	4,568,108	3,538,859
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4,050,924	3,407,437	11,745,090	9,656,183
CANADA
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	765,281	709,507	2,288,146	2,020,395
Non-US [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	629,711	611,381	1,828,386	1,689,014
Shipping and Handling [Member]
Disaggregation of Revenue [Line Items]
Cost of goods sold	$ 77,900	$ 63,500	$ 222,000	$ 179,500

REVENUE Deferred Revenue (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Deferred Revenue	$ 55,500	$ 35,500
Contract with Customer, Asset, before Allowance for Credit Loss	$ 38,600	$ 33,400

REVENUE Shipping and Handling Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Cost of goods sold	$ 4,241,401	$ 3,720,332	$ 12,418,561	$ 10,581,406
Shipping and Handling [Member]
Cost of goods sold	$ 77,900	$ 63,500	$ 222,000	$ 179,500

REVENUE Variable Consideration (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue, Methods, Inputs, and Assumptions Used [Abstract]
Revenue, Variable Consideration Constraint Increase (Decrease)	$ 120,500	$ 85,800	$ 324,100	$ 246,900
Prior Period Adjustment [Abstract]
Prior Period Reclassification Adjustment		$ (9,700)		$ (27,800)

REVENUE Revenue, Performance Obligation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Cost of goods sold	$ 4,241,401	$ 3,720,332	$ 12,418,561	$ 10,581,406

GOODWILL (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
GOODWILL (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Goodwill [Line Items]
Goodwill	$ 3,123,430		$ 3,123,430		$ 3,208,333
Goodwill, Foreign Currency Translation Gain (Loss)			(84,903)
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	2,236,824		2,236,824		2,298,586
Finite-Lived Intangible Assets, Accumulated Amortization	(383,373)		(383,373)		(354,445)
Finite-Lived Intangible Assets, Net	1,853,451		1,853,451		1,944,141
Finite-Lived Intangible Asset, Expected Amortization, Year One	20,467		20,467
Finite-Lived Intangible Asset, Expected Amortization, Year Two	81,838		81,838
Finite-Lived Intangible Asset, Expected Amortization, Year Three	79,445		79,445
Finite-Lived Intangible Asset, Expected Amortization, Year Four	76,389		76,389
Finite-Lived Intangible Asset, Expected Amortization, Year Five	71,073		71,073
Finite-Lived Intangible Asset, Expected Amortization, after Year Five	733,011		733,011
Amortization of Intangible Assets	21,000	$ 37,100	71,400	$ 85,800
Amortization of Intangible Assets	21,000	$ 37,100	71,400	$ 85,800
Finite-Lived Intangible Asset, Expected Amortization, Year Three	79,445		79,445
Finite-Lived Intangible Asset, Expected Amortization, Year Four	76,389		76,389
Finite-Lived Intangible Asset, Expected Amortization, Year Five	71,073		71,073
Finite-Lived Intangible Asset, Expected Amortization, after Year Five	733,011		733,011
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	15,543		15,543		38,758
Finite-Lived Intangible Assets, Accumulated Amortization	(6,799)		(6,799)		(20,058)
Finite-Lived Intangible Assets, Net	8,744		$ 8,744		18,700
Trademarks [Member] \| Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			12 years
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	0		$ 0		4,300
Finite-Lived Intangible Assets, Accumulated Amortization	0		0		(3,493)
Finite-Lived Intangible Assets, Net	0		$ 0		807
Noncompete Agreements [Member] \| Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			2 years
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	1,400,841		$ 1,400,841		1,431,251
Finite-Lived Intangible Assets, Accumulated Amortization	(352,638)		(352,638)		(308,180)
Finite-Lived Intangible Assets, Net	1,048,203		$ 1,048,203		1,123,071
Customer Relationships [Member] \| Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			10 years
Customer Relationships [Member] \| Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			20 years
Distribution Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	29,212		$ 29,212		29,212
Finite-Lived Intangible Assets, Accumulated Amortization	(23,936)		(23,936)		(22,714)
Finite-Lived Intangible Assets, Net	5,276		$ 5,276		6,498
Distribution Rights [Member] \| Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			15 years
Distribution Rights [Member] \| Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			19 years
EES
Goodwill [Line Items]
Goodwill	816,657		$ 816,657		860,958
Goodwill, Foreign Currency Translation Gain (Loss)			(44,301)
CSS
Goodwill [Line Items]
Goodwill	1,107,263		1,107,263		1,121,712
Goodwill, Acquired During Period			(14,449)
UBS
Goodwill [Line Items]
Goodwill	1,199,510		1,199,510		1,225,663
Goodwill, Acquired During Period			(26,153)
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets (Excluding Goodwill)	$ 791,228		$ 791,228		$ 795,065

STOCK-BASED COMPENSATION AWARDS (Details) - $ / shares	3 Months Ended		9 Months Ended
STOCK-BASED COMPENSATION AWARDS (Details) - $ / shares	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0	0	0	139,592
Granted, Weighted Average Fair Value (in dollars per share)	$ 0	$ 0	$ 0	$ 33.19
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	1,669	6,897	226,615	314,480
Granted, Weighted Average Fair Value (in dollars per share)	$ 112.33	$ 108.76	$ 122.04	$ 77.81
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0	0	83,991	122,812
Granted, Weighted Average Fair Value (in dollars per share)	$ 0	$ 0	$ 122.09	$ 76.76
Share-based Payment Arrangement, Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	3,249	0	92,799	0
Granted, Weighted Average Fair Value (in dollars per share)	$ 54.13	$ 0	$ 57.15	$ 0

SCHEDULE OF SHARE-BASED COMPENSATION, STOCK OPTIONS AND STOCK APPRECIATION RIGHTS AWARD ACTIVITY (Details) - Stock Appreciation Rights (SARs) [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	1,260,421		1,260,421		1,370,388
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 62.03		$ 62.03		$ 62.09
Granted (in shares)	0	0	0	139,592
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price			$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised			(101,076)
Weighted Average Exercise Price, Exercises in Period (in dollars per share)			$ 61.79
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures			(8,891)
Weighted Average Exercise Price, Forfeitures in Period (in dollars per share)			$ 73.35
Weighted Average Remaining Contractual Term, Outstanding (in years)			5 years 4 months 24 days
Aggregate Intrinsic Value, Outstanding	$ 72,283		$ 72,283
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number	1,095,626		1,095,626
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 61.92		$ 61.92
Weighted Average Remaining Contractual Term, Exercisable (in years)			5 years 1 month 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 62,959		$ 62,959
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value			$ 7,300

SCHEDULE OF SHARE-BASED PAYMENT AWARD, VALUATION ASSUMPTIONS (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2022 Rate	Sep. 30, 2022 Rate	Sep. 30, 2021 Rate
Share-Based Payment Arrangement [Abstract]
WESCO expected volatility	44.00%	43.00%	41.00%
Risk free interest rate	2.90%	2.00%	0.80%
Expected life (in years)	7 years	7 years	7 years

SUMMARY OF RESTRICTED STOCK UNITS (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based awards outstanding (in shares)	782,705		782,705		974,162
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 73.04		$ 73.04		$ 53.48
Granted (in shares)	1,669	6,897	226,615	314,480
Granted, Weighted Average Fair Value (in dollars per share)	$ 112.33	$ 108.76	$ 122.04	$ 77.81
Vested (in shares)			(382,954)
Vested in Period, Weighted Average Fair Value (in dollars per share)			$ 53.23
Forfeited (in shares)			(35,118)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value			$ 62.58

SUMMARY OF PERFORMANCE-BASED AWARDS (Details) - Performance Shares [Member] - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unvested (in shares)	335,329		335,329		380,819
Granted (in shares)	0	0	83,991	122,812
Vested (in shares)			(115,394)
Forfeited (in shares)			(14,087)
Unvested, Weighted Average Fair Value (in dollars per share)	$ 75.26		$ 75.26		$ 59.23
Granted, Weighted Average Fair Value (in dollars per share)	$ 0	$ 0	122.09	$ 76.76
Vested in Period, Weighted Average Fair Value (in dollars per share)			54.64
Forfeited in Period, Weighted Average Fair Value (in dollars per share)			$ 60.75

STOCK-BASED COMPENSATION (Details) - USD ($) $ in Thousands	3 Months Ended					6 Months Ended	9 Months Ended
STOCK-BASED COMPENSATION (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2022	Sep. 30, 2022	Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense				$ 9,700	$ 9,600		$ 34,446	$ 22,784
Total unrecognized compensation cost				$ 58,200			$ 58,200
Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 1,800	$ 14,900	$ 30,800			$ 10,700

Summary of Non-Qualified Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	1,260,421		1,260,421		1,370,388
Granted (in shares)	0	0	0	139,592
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised			(101,076)
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures			(8,891)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number	1,095,626		1,095,626
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 62.03		$ 62.03		$ 62.09
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price			0
Weighted Average Exercise Price, Exercises in Period (in dollars per share)			61.79
Weighted Average Exercise Price, Forfeitures in Period (in dollars per share)			73.35
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 61.92		$ 61.92
Weighted Average Remaining Contractual Term, Outstanding (in years)			5 years 4 months 24 days
Aggregate Intrinsic Value, Outstanding	$ 72,283		$ 72,283
Weighted Average Remaining Contractual Term, Exercisable (in years)			5 years 1 month 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 62,959		$ 62,959
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value			$ 7,300
Share-based Payment Arrangement, Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	87,347		87,347		0
Granted (in shares)	3,249	0	92,799	0
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised			0
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures			(5,452)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number	879		879
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 121.55		$ 121.55		$ 0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price			121.58
Weighted Average Exercise Price, Exercises in Period (in dollars per share)			0
Weighted Average Exercise Price, Forfeitures in Period (in dollars per share)			122.09
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 122.09		$ 122.09
Weighted Average Remaining Contractual Term, Outstanding (in years)			9 years 3 months 18 days
Aggregate Intrinsic Value, Outstanding	$ 39		$ 39
Weighted Average Remaining Contractual Term, Exercisable (in years)			10 months 24 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 0		$ 0

SCHEDULE OF EARNINGS PER SHARE, BASIC AND DILUTED (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net income (loss) attributable to WESCO International, Inc.	$ 239,602	$ 220,706	$ 181,243	$ 119,596	$ 119,195	$ 59,178	$ 641,551	$ 297,969
Weighted average common shares outstanding used in computing basic earnings per share (in shares)	50,815,000			50,386,000			50,711,000	50,252,000
Common shares issuable upon exercise of dilutive stock options (in shares)	1,574,000			1,677,000			1,675,000	1,644,000
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share (in shares)	52,389,000			52,063,000			52,386,000	51,896,000
Diluted (in dollars per share)	$ 4.30			$ 2.02			$ 11.42	$ 4.91
Basic (in dollars per share)	$ 4.43			$ 2.09			$ 11.80	$ 5.07
Net Income (Loss) Available to Common Stockholders, Basic	$ 225,250			$ 105,244			$ 598,495	$ 254,913
Preferred Stock Dividends, Income Statement Impact	$ 14,352			$ 14,352			$ 43,056	$ 43,056

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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+ Details

EARNINGS PER SHARE (Details) - shares	3 Months Ended	9 Months Ended
EARNINGS PER SHARE (Details) - shares	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021
Stock Appreciation Rights (SARs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	88,896	88,071	139,592

SCHEDULE OF DEBT (Details) - USD ($)
$ in Thousands

Sep. 30, 2022

Dec. 31, 2021

Debt Instrument [Line Items]

Finance lease obligations

$ 19,872

$ 18,563

Total debt

5,315,282

4,772,597

Fair value adjustment to the Anixter Notes

439

957

Unamortized debt issuance costs

(53,610)

(62,484)

Short-term debt and current portion of long-term debt

(69,295)

^[1]

(9,528)

Total long-term debt

5,192,816

4,701,542

Foreign Line of Credit

Debt Instrument [Line Items]

Long-term Debt

6,659

7,354

Accounts Receivable Securitization Facility

Debt Instrument [Line Items]

Long-term Debt

1,525,000

1,270,000

Revolving Credit Facility

Debt Instrument [Line Items]

Long-term Debt

883,097

596,959

5.50% Senior Notes due 2023

Debt Instrument [Line Items]

Long-term Debt

58,636

6.00% Senior Notes due 2025

Debt Instrument [Line Items]

Long-term Debt

4,173

7.125% Senior Notes due 2025

Debt Instrument [Line Items]

Long-term Debt

1,500,000

7.250% Senior Notes due 2028

Debt Instrument [Line Items]

Long-term Debt

1,317,845

1,316,912

Debt Instrument, Unamortized Discount

$ 7,155

$ 8,088

[1]	(1) As of September 30, 2022, short-term debt and current portion of long-term debt includes the $58.6 million aggregate principal amount of the Company's 5.50% Anixter Senior Notes due 2023, which mature on March 1, 2023.

DEBT (Details) - USD ($) $ in Thousands	2 Months Ended		5 Months Ended	7 Months Ended
DEBT (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Feb. 28, 2022	Aug. 01, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Accounts Receivable Securitization Facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,525,000			$ 1,525,000	$ 1,400,000	$ 1,300,000
Debt Instrument, Basis Spread on Variable Rate	1.05%	1.15%	1.10%
Debt Instrument, Maturity Date		Jun. 01, 2024		Mar. 01, 2025
Accordion feature commitment					1,750,000	1,500,000
Long-term Debt	$ 1,525,000			$ 1,525,000		1,270,000
Revolving Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1,525,000			$ 1,525,000	1,350,000	1,200,000
Debt Instrument, Maturity Date		Jun. 22, 2025		Mar. 01, 2027
Aggregate Revolving Commitment Capacity					650,000	400,000
Canadian Dollar Sub-Facility Commitment	600,000			$ 600,000	$ 550,000	500,000
Long-term Debt	883,097			$ 883,097		596,959
Revolving Credit Facility \| Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.00%		0.00%
Revolving Credit Facility \| Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.50%		0.50%
5.50% Senior Notes due 2023
Debt Instrument [Line Items]
Long-term Debt	58,636			$ 58,636		58,636
6.00% Senior Notes due 2025
Debt Instrument [Line Items]
Long-term Debt	4,173			4,173		4,173
7.125% Senior Notes due 2025
Debt Instrument [Line Items]
Long-term Debt	1,500,000			1,500,000		1,500,000
7.250% Senior Notes due 2028
Debt Instrument [Line Items]
Long-term Debt	$ 1,317,845			$ 1,317,845		$ 1,316,912

Defined Contribution Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Postemployment Benefits [Abstract]
Defined Contribution Plan, Cost	$ 12,400	$ 16,400	$ 45,400	$ 49,100

Defined Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Defined Benefit Plans (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,047	$ 4,015	$ 6,318	$ 12,082
Interest cost	4,257	4,483	12,992	13,520
Expected return on plan assets	(7,514)	(8,691)	(22,959)	(26,139)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(179)	103	(547)	311
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement			0	(19)
Net periodic benefit cost	(1,389)	(90)	(4,196)	(245)
Defined Benefit Plan, Service Cost	2,047	4,015	6,318	12,082
Defined Benefit Plan, Plan Assets, Contributions by Employer			9,300
UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	764	0	2,291
Interest cost	2,083	2,018	6,250	6,095
Expected return on plan assets	(3,497)	(4,414)	(10,491)	(13,241)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement			0	(19)
Net periodic benefit cost	(1,414)	(1,632)	(4,241)	(4,874)
Defined Benefit Plan, Service Cost	0	764	0	2,291
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	2,047	3,251	6,318	9,791
Interest cost	2,174	2,465	6,742	7,425
Expected return on plan assets	(4,017)	(4,277)	(12,468)	(12,898)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(179)	103	(547)	311
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement			0	0
Net periodic benefit cost	25	1,542	45	4,629
Defined Benefit Plan, Service Cost	2,047	3,251	6,318	9,791
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year	10,800		10,800
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Other Nonoperating Gains (Losses)	$ (3,400)	$ (4,100)	$ (10,500)	$ (12,300)

Compensation Related Costs, Postemployment Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Defined Contribution Plan Disclosure [Line Items]
Service cost	$ 2,047	$ 4,015	$ 6,318	$ 12,082
Interest cost	4,257	4,483	12,992	13,520
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	7,514	8,691	22,959	26,139
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	179	(103)	547	(311)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(1,389)	(90)	(4,196)	(245)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer			9,300
WESCODeferredCompensationPlanMember
Defined Contribution Plan Disclosure [Line Items]
Deferred Compensation Liability, Classified, Noncurrent	19,600		19,600		$ 20,900
Pension Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other Nonoperating Gains (Losses)	(3,400)	(4,100)	(10,500)	(12,300)
UNITED STATES
Defined Contribution Plan Disclosure [Line Items]
Service cost	0	764	0	2,291
Interest cost	2,083	2,018	6,250	6,095
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	3,497	4,414	10,491	13,241
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(1,414)	(1,632)	(4,241)	(4,874)
Foreign Plan
Defined Contribution Plan Disclosure [Line Items]
Service cost	2,047	3,251	6,318	9,791
Interest cost	2,174	2,465	6,742	7,425
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	4,017	4,277	12,468	12,898
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	179	(103)	547	(311)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	25	1,542	$ 45	4,629
U.S. Defined Contribution Plan Merger \| Defined Benefit Contribution Plan Initial Percent Of Employer Match Member
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match			100.00%
Defined Contribution Plan Employer Matching Contribution Percent			3.00%
U.S. Defined Contribution Plan Merger \| Defined Benefit Contribution Plan Additional Percent Of Employer Match
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match			50.00%
Defined Contribution Plan Employer Matching Contribution Percent			4.00%
Wesco Canadian Defined Contribution Plan
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent			5.00%
Wesco Canadian Defined Contribution Plan \| Defined Benefit Contribution Plan Initial Percent Of Employer Match Member
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan Employer Matching Contribution Percent			3.00%
Wesco Canadian Defined Contribution Plan \| Defined Benefit Contribution Plan Additional Percent Of Employer Match
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match			50.00%
Defined Contribution Plan Employer Matching Contribution Percent			4.00%
Phantom Share Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			3 years
Share-based Payment Arrangement, Expense	1,800	$ 3,400	$ 1,600	$ 9,800
Other Deferred Compensation Arrangements, Liability, Classified, Noncurrent	$ 7,900		$ 7,900		$ 22,700

Other Benefits (Details) - Phantom Share Units (PSUs) [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Compensation Related Costs [Abstract]
Deferred Compensation Cash-Based Arrangements, Liability, Current and Noncurrent	$ 7,100		$ 7,100		$ 17,300
Deferred Compensation Cash-Based Arrangements, Liability, Current					10,900
Deferred Compensation Cash-Based Arrangements, Liability, Classified, Noncurrent					6,400
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			3 years
Other Deferred Compensation Arrangements, Liability, Classified, Noncurrent	7,900		$ 7,900		22,700
Share-based Payment Arrangement, Expense	1,800	$ 3,400	1,600	$ 9,800
Deferred Compensation Cash-Based Arrangements, Liability, Current					10,900
Deferred Compensation Cash-Based Arrangements, Liability, Current and Noncurrent	7,100		7,100		17,300
Deferred Compensation Cash-Based Arrangements, Liability, Classified, Noncurrent					$ 6,400
Share-based Payment Arrangement, Expense	$ 1,800	$ 3,400	$ 1,600	$ 9,800

FAIR VALUE (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative, Notional Amount	$ 224,300	$ 188,600
Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	2,866,500	3,118,000
Long-term Debt	$ 2,881,100	$ 2,880,700

- Definition

Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

+ References + Details

INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
INCOME TAXES (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Tax Contingency [Line Items]
Effective tax rate	26.30%	27.20%	24.00%	22.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount	$ 3,200	$ 3,300	$ 9,400	$ 7,800
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 800	$ 4,200	$ 800	$ 4,200

INCOME TAXES Income Tax Rates (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Percent	26.30%	27.20%	24.00%	22.00%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	70.00%	70.00%	260.00%	310.00%
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount			$ 13,400	$ 8,300
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount	$ 3,200	$ 3,300	$ 9,400	$ 7,800

Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Segment Reporting (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Segment Reporting [Abstract]
Revenues	$ 5,445,916	$ 4,728,325	$ 15,861,622	$ 13,365,592
Operating Income (Loss)	401,592	229,466	1,056,330	581,589
Adjusted EBITDA	$ 465,896	$ 330,260	$ 1,274,478	$ 856,054
Adjusted EBITDA Margin %	8.60%	7.00%	8.00%	6.40%
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 5,445,916	$ 4,728,325	$ 15,861,622	$ 13,365,592
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	401,592	229,466	1,056,330	581,589
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	14,080,564		14,080,564		$ 12,617,699
EES
Segment Reporting [Abstract]
Adjusted EBITDA	$ 225,764	$ 173,898	$ 653,630	$ 453,894
Adjusted EBITDA Margin %	10.10%	8.80%	9.80%	8.10%
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 2,234,771	$ 1,982,485	$ 6,654,883	$ 5,626,309
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,541,553		4,541,553		4,098,335
CSS
Segment Reporting [Abstract]
Adjusted EBITDA	$ 156,370	$ 133,701	$ 429,452	$ 355,521
Adjusted EBITDA Margin %	9.80%	9.00%	9.30%	8.50%
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 1,602,459	$ 1,488,689	$ 4,638,631	$ 4,200,424
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,988,009		4,988,009		4,601,132
UBS
Segment Reporting [Abstract]
Adjusted EBITDA	$ 186,257	$ 114,674	$ 491,652	$ 299,030
Adjusted EBITDA Margin %	11.60%	9.10%	10.80%	8.40%
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 1,608,686	$ 1,257,151	$ 4,568,108	$ 3,538,859
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	3,817,459		3,817,459		3,266,231
Corporate Segment
Segment Reporting [Abstract]
Adjusted EBITDA	(102,495)	(92,013)	(300,256)	(252,391)
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0	$ 0	0	$ 0
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 733,543		$ 733,543		$ 652,001

Segment Reporting - ADJ EBITDA Reconciliations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net Income (Loss) Available to Common Stockholders, Basic	$ 225,250	$ 105,244	$ 598,495	$ 254,913
Net (loss) income attributable to noncontrolling interest	608	600	1,439	665
Preferred Stock Dividends, Income Statement Impact	14,352	14,352	43,056	43,056
Provision for income taxes	85,637	44,870	203,178	84,201
Nonoperating Income (Expense)	75,057	69,720	207,155	207,683
Depreciation and amortization	42,723	56,732	135,569	144,645
Other Nonoperating Income (Expense)	688	(5,320)	3,007	(8,929)
StockBasedCompensationExpenseEBITDA	8,371	8,312	30,379	18,955
MergerRelatedAndIntegrationCosts	13,210	35,750	52,200	119,792
Gain (Loss) on Disposition of Business			0	(8,927)
Adjusted EBITDA	465,896	330,260	1,274,478	856,054
Stock-based compensation expense	$ 9,700	$ 9,600	$ 34,446	$ 22,784
Adjusted EBITDA Margin %	8.60%	7.00%	8.00%	6.40%
Merger Related Stock Based Compensation Expense	$ 1,300	$ 1,300	$ 4,100	$ 3,800
EES
Net Income (Loss) Available to Common Stockholders, Basic	214,054	155,627	615,547	410,233
Net (loss) income attributable to noncontrolling interest	200	309	561	158
Preferred Stock Dividends, Income Statement Impact	0	0	0	0
Provision for income taxes	0	0	0	0
Nonoperating Income (Expense)	0	0	0	0
Depreciation and amortization	9,596	16,840	32,818	40,184
Other Nonoperating Income (Expense)	1,069	726	2,646	1,329
StockBasedCompensationExpenseEBITDA	2,983	1,848	7,350	4,648
MergerRelatedAndIntegrationCosts	0	0	0	0
Gain (Loss) on Disposition of Business				0
Adjusted EBITDA	$ 225,764	$ 173,898	$ 653,630	$ 453,894
Adjusted EBITDA Margin %	10.10%	8.80%	9.80%	8.10%
CSS
Net Income (Loss) Available to Common Stockholders, Basic	$ 138,747	$ 107,898	$ 373,073	$ 292,537
Net (loss) income attributable to noncontrolling interest	0	0	0	0
Preferred Stock Dividends, Income Statement Impact	0	0	0	0
Provision for income taxes	0	0	0	0
Nonoperating Income (Expense)	0	0	0	0
Depreciation and amortization	15,929	24,723	51,916	60,257
Other Nonoperating Income (Expense)	(266)	(328)	(716)	(909)
StockBasedCompensationExpenseEBITDA	1,428	752	3,747	1,818
MergerRelatedAndIntegrationCosts	0	0	0	0
Gain (Loss) on Disposition of Business				0
Adjusted EBITDA	$ 156,370	$ 133,701	$ 429,452	$ 355,521
Adjusted EBITDA Margin %	9.80%	9.00%	9.30%	8.50%
UBS
Net Income (Loss) Available to Common Stockholders, Basic	$ 180,354	$ 108,150	$ 472,119	$ 289,851
Net (loss) income attributable to noncontrolling interest	0	0	0	0
Preferred Stock Dividends, Income Statement Impact	0	0	0	0
Provision for income taxes	0	0	0	0
Nonoperating Income (Expense)	0	0	0	0
Depreciation and amortization	5,859	5,869	17,315	16,545
Other Nonoperating Income (Expense)	1,063	(22)	452	(44)
StockBasedCompensationExpenseEBITDA	1,107	633	2,670	1,517
MergerRelatedAndIntegrationCosts	0	0	0	0
Gain (Loss) on Disposition of Business				8,927
Adjusted EBITDA	$ 186,257	$ 114,674	$ 491,652	$ 299,030
Adjusted EBITDA Margin %	11.60%	9.10%	10.80%	8.40%
Corporate Segment
Net Income (Loss) Available to Common Stockholders, Basic	$ (307,905)	$ (266,431)	$ (862,244)	$ (737,708)
Net (loss) income attributable to noncontrolling interest	408	291	878	507
Preferred Stock Dividends, Income Statement Impact	14,352	14,352	43,056	43,056
Provision for income taxes	85,637	44,870	203,178	84,201
Nonoperating Income (Expense)	(75,057)	(69,720)	(207,155)	(207,683)
Depreciation and amortization	11,339	9,300	33,520	27,659
Other Nonoperating Income (Expense)	(2,554)	4,944	(5,389)	8,553
StockBasedCompensationExpenseEBITDA	2,853	5,079	16,612	10,972
MergerRelatedAndIntegrationCosts	13,210	35,750	52,200	119,792
Gain (Loss) on Disposition of Business				0
Adjusted EBITDA	$ (102,495)	$ (92,013)	$ (300,256)	$ (252,391)

Subsequent Events (Details) - USD ($) $ in Thousands		2 Months Ended		5 Months Ended
Subsequent Events (Details) - USD ($) $ in Thousands	Nov. 04, 2022	Sep. 30, 2022	Feb. 28, 2022	Aug. 01, 2022	Oct. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Subsequent Event \| Rahi Systems
Subsequent Event [Line Items]
Total purchase consideration	$ 217,000
Accounts Receivable Securitization Facility
Subsequent Events [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,525,000				$ 1,400,000	$ 1,300,000
Debt Instrument, Basis Spread on Variable Rate		1.05%	1.15%	1.10%
Subsequent Event [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,525,000				1,400,000	1,300,000
Debt Instrument, Basis Spread on Variable Rate		1.05%	1.15%	1.10%
Accounts Receivable Securitization Facility \| Subsequent Event
Subsequent Events [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity					$ 1,625,000
Subsequent Event [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					1,625,000
Revolving Credit Facility
Subsequent Events [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,525,000				1,350,000	1,200,000
Canadian Dollar Sub-Facility Commitment		600,000				550,000	500,000
Subsequent Event [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		1,525,000				1,350,000	1,200,000
Canadian Dollar Sub-Facility Commitment		$ 600,000				$ 550,000	$ 500,000
Revolving Credit Facility \| Subsequent Event
Subsequent Events [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity					1,725,000
Canadian Dollar Sub-Facility Commitment					625,000
Subsequent Event [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					1,725,000
Canadian Dollar Sub-Facility Commitment					$ 625,000