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EARNINGS PER SHARE
 9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
EARNINGS PER SHARE Basic earnings per share is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares outstanding during the periods. Diluted earnings per share is computed by dividing net income attributable to common stockholders by the weighted-average common shares and common share equivalents outstanding during the periods. The dilutive effect of common share equivalents is considered in the diluted earnings per share computation using the treasury stock method, which includes consideration of equity awards.
The following table sets forth the details of basic and diluted earnings per share:
Three Months EndedNine Months Ended
 September 30September 30
(In thousands, except per share data)2021202020212020
Net income attributable to WESCO International, Inc.$119,596 $80,678 $297,969 $80,578 
Less: Preferred stock dividends14,352 14,511 43,056 15,787 
Net income attributable to common stockholders$105,244 $66,167 $254,913 $64,791 
Weighted-average common shares outstanding used in computing basic earnings per share
50,386 50,043 50,252 44,873 
Common shares issuable upon exercise of dilutive equity awards
1,677 444 1,644 231 
Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share52,063 50,487 51,896 45,104 
Earnings per share attributable to common stockholders
Basic$2.09 $1.32 $5.07 $1.44 
Diluted$2.02 $1.31 $4.91 $1.44 
The computation of diluted earnings per share attributable to common stockholders excludes stock-based awards that would have an antidilutive effect on earnings per share. For the three months ended September 30, 2021, there were no antidilutive stock-based awards, and for the nine months then ended, there were approximately 0.1 million antidilutive awards. For the three and nine months ended September 30, 2020, the computation of diluted earnings per share attributable to common stockholders excluded stock-based awards of approximately 2.0 million and 3.0 million, respectively.