CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Gross Profit [Abstract]
Revenues	$ 5,445,916	$ 4,728,325	$ 15,861,622	$ 13,365,592
Cost of goods sold	4,241,401	3,720,332	12,418,561	10,581,406
Operating Expenses [Abstract]
Selling, general and administrative expense	760,200	721,795	2,251,162	2,057,952
Depreciation and amortization	42,723	56,732	135,569	144,645
Income from operations	401,592	229,466	1,056,330	581,589
Nonoperating Income (Expense)	75,057	69,720	207,155	207,683
Other Nonoperating Income (Expense)	688	(5,320)	3,007	(8,929)
Income before income taxes	325,847	165,066	846,168	382,835
Provision for income taxes	85,637	44,870	203,178	84,201
Net income	240,210	120,196	642,990	298,634
Net (loss) income attributable to noncontrolling interest	608	600	1,439	665
Net income attributable to WESCO International, Inc.	239,602	119,596	641,551	297,969
Preferred Stock Dividends, Income Statement Impact	14,352	14,352	43,056	43,056
Net Income (Loss) Available to Common Stockholders, Basic	225,250	105,244	598,495	254,913
Comprehensive Income:
Foreign currency translation adjustment	(146,732)	(50,277)	(194,465)	(12,217)
Comprehensive income attributable to WESCO International, Inc.	$ 78,518	$ 54,967	$ 404,030	$ 242,696
Basic (in dollars per share)	$ 4.43	$ 2.09	$ 11.80	$ 5.07
Diluted (in dollars per share)	$ 4.30	$ 2.02	$ 11.42	$ 4.91