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REVENUE Variable Consideration (Details)
 3 Months Ended
Mar. 31, 2020
Revenue, Methods, Inputs, and Assumptions Used [Abstract]  
Revenue, Information Used to Assess Variable Consideration Constraint 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 anticipated performance, historical data, as well as current and forecasted information. Measurement and recognition of variable consideration is reviewed by management on a monthly basis and revenue is adjusted accordingly. Variable consideration reduced revenue for the three months ended March 31, 2020 and 2019 by approximately $23.3 million and $25.5 million, respectively.