INCOME TAXES	9 Months Ended
INCOME TAXES	Sep. 30, 2020
Income Tax Disclosure [Abstract]
INCOME TAXES	13. INCOME TAXES The effective tax rate for the three and nine months ended September 30, 2020 was 23.3% and 22.9%, respectively. The effective tax rate for the three and nine months ended September 30, 2019 was 19.8% and 21.0%, respectively. WESCO’s effective tax rate is typically impacted by the tax effect of intercompany financing, foreign tax rate differences, nondeductible expenses and state income taxes. The effective tax rates for the current year periods are higher than the corresponding prior year periods primarily due to expenses incurred by WESCO to complete the acquisition of Anixter. There have been no material adjustments to liabilities for uncertain tax positions since the last annual disclosure, except for preliminary amounts recorded in connection with the acquisition of Anixter, which totaled $30.0 million. In addition, the Company reassessed the realizability of certain deferred income tax assets acquired, including Anixter’s foreign tax credit carryforwards. As a result, the Company preliminary allocated $59.4 million to a foreign tax credit carryforward and $41.4 million to the related valuation allowance.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.