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Earnings Per Share | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share |
Earnings Per Share | 6. 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,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Number of common shares outstanding at end of period |  | 428.4 |  | 439.7 |  | 428.4 |  | 439.7
Effect of using weighted average common shares outstanding |  | 1.5 |  | 2.2 |  | 3.2 |  | 1.9
Weighted average basic common shares outstanding |  | 429.9 |  | 441.9 |  | 431.6 |  | 441.6
Dilutive effect of equity-based compensation awards and other contingently issuable shares |  | 2.4 |  | 2.5 |  | 2.5 |  | 2.8
Weighted average diluted common shares outstanding |  | 432.3 |  | 444.4 |  | 434.1 |  | 444.4
Potentially issuable shares |  | 8.0 |  | 8.4 |  | 8.0 |  | 8.4
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding |  | 1.9 |  | 2.3 |  | 1.9 |  | 2.3

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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