EARNINGS PER SHARE (Tables)

6 Months Ended

Jun. 30, 2021

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

The following table sets forth the details of basic and diluted earnings (loss) per share:

	Three Months Ended				Six Months Ended
	June 30				June 30
(In thousands, except per share data)	2021		2020		2021		2020
Net income (loss) attributable to WESCO International, Inc.	$	119,195	$	(34,506)	$	178,373	$	(100)
Less: Preferred stock dividends	14,352		1,276		28,704		1,276
Net income (loss) attributable to common stockholders	$	104,843	$	(35,782)	$	149,669	$	(1,376)
Weighted-average common shares outstanding used in computing basic earnings per share	50,243		42,683		50,184		42,260
Common shares issuable upon exercise of dilutive equity awards	1,751		92		1,691		152
Weighted-average common shares outstanding and common share equivalents, diluted	51,994		42,775		51,875		42,412
Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings (loss) per share	51,994		42,683		51,875		42,260
Earnings (loss) per share attributable to common stockholders
Basic	$	2.09	$	(0.84)	$	2.98	$	(0.03)
Diluted	$	2.02	$	(0.84)	$	2.89	$	(0.03)