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Earnings Per Share | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share |
Earnings Per Share | 16. 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):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018
Number of common shares outstanding at end of period |  | 422.8 | ​ | 424.3 |  | 424.0
Effect of using weighted average common shares outstanding |  | 0.2 | ​ | 0.3 |  | 5.1
Weighted average basic common shares outstanding |  | 423.0 | ​ | 424.6 |  | 429.1
Dilutive effect of equity-based compensation awards and other contingently issuable shares |  | 2.1 | ​ | 2.9 |  | 3.1
Weighted average diluted common shares outstanding |  | 425.1 | ​ | 427.5 |  | 432.2
Potentially issuable shares |  | 6.1 | ​ | 6.7 |  | 7.4
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding |  | 1.6 | ​ | 0.7 |  | 1.5
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