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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share |
Common Share Data Used for Computing Basic and Diluted Earnings Per Share | Basic and diluted earnings per share were computed using the following common share data for the years ended December 31 (shares in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |  | 2017
Number of common shares outstanding at end of period |  | 424.3 | ​ | 424.0 |  | 433.3
Effect of using weighted average common shares outstanding |  | 0.3 | ​ | 5.1 |  | 5.5
Weighted average basic common shares outstanding |  | 424.6 | ​ | 429.1 |  | 438.8
Dilutive effect of equity-based compensation awards and other contingently issuable shares |  | 2.9 | ​ | 3.1 |  | 3.1
Weighted average diluted common shares outstanding |  | 427.5 | ​ | 432.2 |  | 441.9
Potentially issuable shares |  | 6.7 | ​ | 7.4 |  | 8.1
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding |  | 0.7 | ​ | 1.5 |  | 1.9

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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