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Earnings Per Share
 12 Months Ended
Dec. 31, 2022
Earnings Per Share  
Earnings Per Share

15.  Earnings Per Share

Basic and diluted earnings per share were computed using the following common share data for the year ended December 31 (shares in millions):

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2022

    

2021

    

2020

Number of common shares outstanding at end of period

 

407.9

​

416.1

 

422.8

Effect of using weighted average common shares outstanding

 

4.9

​

4.3

 

0.2

Weighted average basic common shares outstanding

 

412.8

​

420.4

 

423.0

Dilutive effect of equity-based compensation awards and other contingently issuable shares

 

2.2

​

2.5

 

2.1

Weighted average diluted common shares outstanding

 

415.0

​

422.9

 

425.1

Potentially issuable shares

 

5.2

​

5.7

 

6.1

Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding

 

1.1

​

0.6

 

1.6

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Refer to the Consolidated Statements of Operations for net income attributable to Waste Management, Inc.