Cover Page
May 29, 2020
Cover [Abstract]  
Document Type 8-K
Document Period End Date May 29, 2020
Entity Registrant Name WESCO International, Inc.
Entity Incorporation, State or Country Code DE
Entity File Number 001-14989
Entity Tax Identification Number 25-1723342
Entity Address, Address Line One 225 West Station Square DriveSuite 700
Entity Address, Postal Zip Code 15219
Entity Address, City or Town Pittsburgh,
Entity Address, State or Province PA
City Area Code 412
Local Phone Number 454-2200
Title of 12(b) Security Common Stock, par value $.01 per share
Trading Symbol WCC
Security Exchange Name NYSE
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Entity Central Index Key 0000929008
Amendment Flag false