SCHEDULE OF EARNINGS PER SHARE, BASIC AND DILUTED (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Net income (loss) attributable to WESCO International, Inc.	$ 193.1	$ 197.1	$ 220.7	$ 181.2	$ 390.2	$ 401.9
Weighted average common shares outstanding used in computing basic earnings per share (in shares)	51.3		50.7		51.1	50.7
Common shares issuable upon exercise of dilutive stock options (in shares)	1.1		1.5		1.3	1.6
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share (in shares)	52.4		52.2		52.4	52.2
Diluted (in dollars per share)	$ 3.41		$ 3.95		$ 6.90	$ 7.15
Basic (in dollars per share)	$ 3.48		$ 4.07		$ 7.07	$ 7.37
Net Income (Loss) Available to Common Stockholders, Basic	$ 178.7		$ 206.3		$ 361.5	$ 373.2
Preferred Stock Dividends, Income Statement Impact	$ 14.4		$ 14.4		$ 28.7	$ 28.7