CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Gross Profit [Abstract]
Revenues	$ 5,483,525	$ 4,595,790	$ 10,415,706	$ 8,637,267
Cost of goods sold	4,294,086	3,630,633	8,177,160	6,861,074
Operating Expenses [Abstract]
Selling, general and administrative expense	772,864	699,581	1,490,962	1,336,157
Depreciation and amortization	45,866	46,704	92,846	87,913
Income from operations	370,709	218,872	654,738	352,123
Nonoperating Income (Expense)	68,478	67,590	132,098	137,963
Other Nonoperating Income (Expense)	1,195	(802)	2,319	(3,609)
Income before income taxes	301,036	152,084	520,321	217,769
Provision for income taxes	79,887	32,800	117,541	39,331
Net income	221,149	119,284	402,780	178,438
Net (loss) income attributable to noncontrolling interest	443	89	831	65
Net income attributable to WESCO International, Inc.	220,706	119,195	401,949	178,373
Preferred Stock Dividends, Income Statement Impact	14,352	14,352	28,704	28,704
Net Income (Loss) Available to Common Stockholders, Basic	206,354	104,843	373,245	149,669
Comprehensive Income:
Foreign currency translation adjustment	(79,373)	21,219	(47,733)	38,060
Comprehensive income attributable to WESCO International, Inc.	$ 126,981	$ 126,062	$ 325,512	$ 187,729
Basic (in dollars per share)	$ 4.07	$ 2.09	$ 7.37	$ 2.98
Diluted (in dollars per share)	$ 3.95	$ 2.02	$ 7.15	$ 2.89