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Document and Entity Information
Jun. 22, 2020
Entity Listings [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jun. 22, 2020
Current Fiscal Year End Date --12-31
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 Drive
Entity Address, Address Line Two Suite 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
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
Depositary Shares, each representing a 1/1,000th interest in a share of Series A Fixed-Rate Reset Cumulative Perpetual Preferred Stock [Member]  
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
Common Stock [Member]  
Entity Listings [Line Items]  
Title of 12(b) Security Common Stock, par value $0.01 per share
Trading Symbol WCC
Security Exchange Name NYSE