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Earnings Per Share | 6 Months Ended
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Jun. 30, 2020
Earnings Per Share |
Earnings Per Share | 5. Earnings Per Share Basic and diluted earnings per share were computed using the following common share data (shares in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | June 30, | ​ | June 30,
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019
Number of common shares outstanding at end of period |  | 422.2 |  | 423.8 |  | 422.2 |  | 423.8
Effect of using weighted average common shares outstanding |  | 0.1 |  | 1.0 |  | 1.0 |  | 0.8
Weighted average basic common shares outstanding |  | 422.3 |  | 424.8 |  | 423.2 |  | 424.6
Dilutive effect of equity-based compensation awards and other contingently issuable shares |  | 1.6 |  | 2.7 |  | 1.9 |  | 2.6
Weighted average diluted common shares outstanding |  | 423.9 |  | 427.5 |  | 425.1 |  | 427.2
Potentially issuable shares |  | 6.5 |  | 7.2 |  | 6.5 |  | 7.2
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding |  | 2.1 |  | 1.1 |  | 2.1 |  | 1.9
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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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