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Earnings Per Share | 3 Months Ended
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Mar. 31, 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 for the three months ended March 31 (shares in millions):
|  | 2018 |  | 2017
Number of common shares outstanding at end of period |  | 431.8 |  | 441.9
Effect of using weighted average common shares outstanding |  | 1.5 |  | (0.6)
Weighted average basic common shares outstanding |  | 433.3 |  | 441.3
Dilutive effect of equity-based compensation awards and other contingently issuable shares |  | 2.5 |  | 2.8
Weighted average diluted common shares outstanding |  | 435.8 |  | 444.1
Potentially issuable shares |  | 8.2 |  | 9.2
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding |  | 3.0 |  | 3.0

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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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