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INCOME TAXES
 3 Months Ended
Mar. 31, 2021
Income Tax Disclosure [Abstract]  
INCOME TAXES The effective tax rate for the three months ended March 31, 2021 and 2020 was 9.9% and 23.1%, respectively. WESCO’s effective tax rate typically differs from the federal statutory income tax rate due to the tax effect of intercompany financing, foreign tax rate differences, the U.S. taxes imposed on foreign income, nondeductible expenses and state income taxes. The effective tax rate for the three months ended March 31, 2021 is lower than the prior period primarily due to a discrete income tax benefit of $8.3 million resulting from a change in the valuation allowance recorded against foreign tax credit carryforwards. There have been no material adjustments to liabilities for uncertain tax positions since the last annual disclosure for the year ended December 31, 2020.