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EARNINGS PER SHARE (Tables)
 9 Months Ended
Sep. 30, 2023
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table sets forth the computation of basic and diluted earnings per share for the periods presented:
Three Months EndedNine Months Ended
 September 30September 30
(In millions, except per share data)2023
2022(1)
2023
2022(1)
Net income attributable to WESCO International, Inc.$233.4 $239.6 $623.6 $641.6 
Less: Preferred stock dividends14.4 14.4 43.1 43.1 
Net income attributable to common stockholders$219.0 $225.2 $580.5 $598.5 
Weighted-average common shares outstanding used in computing basic earnings per share
51.2 50.8 51.2 50.7 
Common shares issuable upon exercise of dilutive equity awards
1.0 1.6 1.2 1.7 
Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share52.2 52.4 52.4 52.4 
Earnings per share attributable to common stockholders
Basic$4.28 $4.43 $11.34 $11.80 
Diluted$4.20 $4.30 $11.08 $11.42