CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net sales	$ 12,325,995	$ 8,358,917	$ 8,176,601
Cost of goods sold (excluding depreciation and amortization below)	9,998,329	6,777,456	6,609,220
Selling, general and administrative expense	1,859,028	1,173,137	1,151,944
Depreciation and amortization	121,600	62,107	62,997
Income from operations	347,038	346,217	352,440
Interest expense, net	226,591	65,710	68,661
Other, net	(2,395)	(1,554)	2,754
Income before income taxes	122,842	282,061	281,025
Provision for income taxes	22,803	59,863	55,670
Net income	100,039	222,198	225,355
Net loss attributable to noncontrolling interest	(521)	(1,228)	(1,988)
Net Income attributable to WESCO International, Inc.	100,560	223,426	227,343
Preferred Stock Dividends, Income Statement Impact	30,139	0	0
Net Income (Loss) Available to Common Stockholders, Basic	70,421	223,426	227,343
Comprehensive Income:
Foreign currency translation adjustment	95,577	49,306	(99,643)
Benefit plan adjustments	9,061	(8,643)	3,798
Comprehensive income attributable to WESCO International, Inc.	$ 175,059	$ 264,089	$ 131,498
Earnings per share :
Basic	$ 1.53	$ 5.18	$ 4.87
Diluted	$ 1.51	$ 5.14	$ 4.82