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SELECTED QUARTERLY FINANCIAL DATA (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information



	First Quarter				Second Quarter				Third Quarter				Fourth Quarter
2018
Net Sales	$	1,993,915			$	2,103,994			$	2,067,245			$	2,011,447
Cost of goods sold (excluding depreciation and amortization)	1,613,966				1,704,100				1,670,037				1,621,117
Income from operations	73,241				91,183				97,517				90,499
Income before income taxes	53,458				73,442				80,467				73,658
Net income	42,971				57,673				66,645				58,066
Net income attributable to WESCO International	44,421				57,940				66,849				58,133
Basic earnings per share attributable to WESCO International⁽²⁾	0.94				1.23				1.42				1.27
Diluted earnings per share attributable to WESCO International⁽³⁾	0.93				1.22				1.41				1.26

2017
Net Sales	$	1,772,591			$	1,909,624			$	2,000,159			$	1,996,647
Cost of goods sold (excluding depreciation and amortization)	1,422,573				1,543,510				1,614,814				1,613,469
Income from operations	67,089				83,105				89,250				81,446
Income before income taxes	50,368				66,289				71,939				63,844
Net income⁽¹⁾	37,800				49,535				53,576				22,222
Net income attributable to WESCO International⁽¹⁾	37,729				49,510				53,675				22,546
Basic earnings per share attributable to WESCO International^{(1) (2)}	0.77				1.03				1.13				0.48
Diluted earnings per share attributable to WESCO International^{(1) (3)}	0.76				1.02				1.12				0.47