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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 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 (shares in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
​ |  | 2019 |  | 2018 |  | 2019 |  | 2018
Number of common shares outstanding at end of period |  | 424.2 |  | 427.1 |  | 424.2 |  | 427.1
Effect of using weighted average common shares outstanding |  | 0.3 |  | 0.8 |  | 0.4 |  | 3.2
Weighted average basic common shares outstanding |  | 424.5 |  | 427.9 |  | 424.6 |  | 430.3
Dilutive effect of equity-based compensation awards and other contingently issuable shares |  | 2.9 |  | 2.9 |  | 2.8 |  | 2.9
Weighted average diluted common shares outstanding |  | 427.4 |  | 430.8 |  | 427.4 |  | 433.2
Potentially issuable shares |  | 6.8 |  | 7.6 |  | 6.8 |  | 7.6
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding |  | 0.7 |  | 1.5 |  | 0.7 |  | 1.5

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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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