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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2019
Earnings Per Share |
Common Share Data Used for Computing Basic and Diluted Earnings Per Share | Basic and diluted earnings per share for the three months ended March 31 were computed using the following common share data (shares in millions):
|  | 2019 |  | 2018
Number of common shares outstanding at end of period |  | 424.7 |  | 431.8
Effect of using weighted average common shares outstanding |  | (0.2) |  | 1.5
Weighted average basic common shares outstanding |  | 424.5 |  | 433.3
Dilutive effect of equity-based compensation awards and other contingently issuable shares |  | 2.4 |  | 2.5
Weighted average diluted common shares outstanding |  | 426.9 |  | 435.8
Potentially issuable shares |  | 7.6 |  | 8.2
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding |  | 3.0 |  | 3.0

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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://www.xbrl.org/2003/role/presentationRef -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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