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INCOME TAXES
 9 Months Ended
Sep. 30, 2021
Income Tax Disclosure [Abstract]  
INCOME TAXES The effective tax rate for the three and nine months ended September 30, 2021 was 27.2% and 22.0%, respectively. The effective tax rate for the three and nine months ended September 30, 2020 was 23.3% and 22.9%, 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 September 30, 2021 is higher than the corresponding quarter of the prior year primarily due to the impact on the estimated annual effective tax rate of a decrease in expected foreign tax credit utilization. For the nine months ended September 30, 2021, the effective tax rate reflects discrete income tax benefits resulting from a decrease in the valuation allowance recorded against foreign tax credit carryforwards of $8.3 million and deductible stock-based compensation of $7.8 million, which were partially offset by discrete income tax expense of $4.2 million associated with return-to-provision adjustments. These discrete items reduced the estimated annual effective tax rate by approximately 3.1 percentage points. There have been no material adjustments to liabilities for uncertain tax positions since the last annual disclosure for the year ended December 31, 2020.