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SCHEDULE OF EARNINGS PER SHARE, BASIC AND DILUTED (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share [Abstract]                
Net income (loss) attributable to WESCO International, Inc. $ 187.5 $ 174.5 $ 118.4 $ 204.3 $ 232.1 $ 115.8 $ 480.3 $ 552.2
Weighted average common shares outstanding used in computing basic earnings per share (in shares) 48.7     49.1     48.8 50.0
Common shares issuable upon exercise of dilutive stock options (in shares) 0.8     0.7     0.7 0.8
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share (in shares) 49.5     49.8     49.5 50.8
Diluted (in dollars per share) $ 3.79     $ 3.81     $ 9.71 $ 10.02
Basic (in dollars per share) $ 3.85     $ 3.87     $ 9.85 $ 10.18
Net Income (Loss) Available to Common Stockholders, Basic $ 187.5     $ 189.9     $ 480.6 $ 509.1
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0.1           0.2 0.2
Preferred Stock Dividends, Income Statement Impact $ 0.0     14.4     $ 27.3 $ 43.1
Preferred Stock Redemption Discount $ 0.0     $ 0.0     $ 27.6 $ 0.0