0000929008 2020-12-15 2020-12-15 0000929008 us-gaap:CommonClassAMember 2020-12-15 2020-12-15 0000929008 us-gaap:SeriesAPreferredStockMember 2020-12-15 2020-12-15 0000929008 wcc:PreferredSharePurchaseRightMember 2020-12-15 2020-12-15 0000929008 false 8-K 8-K 2020-12-15 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 Depositary Shares, each representing a 1/100th interest in a share of Series A Fixed-Rate Reset Cumulative Perpetual Preferred Stock WCC PR A NYSE Preferred Share Purchase Rights N/A NYSE false false false false false