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EARNINGS PER SHARE (Tables)
12 Months Ended
Dec. 31, 2023
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table sets forth the details of basic and diluted earnings per share:
 Year Ended December 31,
 202320222021
(In millions, except per share data)  
Net income attributable to WESCO International, Inc.$765.5 $860.5 $465.4 
Less: Preferred stock dividends57.4 57.4 57.4 
Net income attributable to common stockholders$708.1 $803.1 $408.0 
Weighted-average common shares outstanding used in computing basic earnings per share
51.1 50.7 50.3 
Common shares issuable upon exercise of dilutive equity awards1.2 1.7 1.7 
Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share
52.3 52.4 52.0 
Earnings per share attributable to common stockholders 
Basic$13.86 $15.83 $8.11 
Diluted$13.54 $15.33 $7.84