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EARNINGS PER SHARE (Tables)
3 Months Ended
Mar. 31, 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 Ended
 March 31
(In millions, except per share data)20232022
Net income attributable to WESCO International, Inc.$197.1 $181.2 
Less: Preferred stock dividends14.4 14.4 
Net income attributable to common stockholders$182.7 $166.8 
Weighted-average common shares outstanding used in computing basic earnings per share
51.0 50.6 
Common shares issuable upon exercise of dilutive equity awards
1.5 1.6 
Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share52.5 52.2 
Earnings per share attributable to common stockholders
Basic$3.58 $3.30 
Diluted$3.48 $3.19