0000929008 2019-12-26 2019-12-26 false 0000929008 8-K 2019-12-26 WESCO International, Inc. DE 001-14989 25-1723342 225 West Station Square DriveSuite 700 15219 Pittsburgh, PA 412 454-2200 Common Stock, par value $.01 per share WCC NYSE false false false false false 2019-12-26