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Earnings Per Share | 3 Months Ended
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Mar. 31, 2017
Earnings Per Share [Abstract] |
Earnings Per Share |
5. | Earnings Per Share
Basic and diluted earnings per share were computed using the following common share data (shares in millions):
|  | Three Months Ended March 31, |
|  | 2017 |  |  | 2016 |
Number of common shares outstanding at end of period |  |  | 441.9 |  |  |  | 444.7 |
Effect of using weighted average common shares outstanding |  |  | (0.6 | ) |  |  | 1.4 |
Weighted average basic common shares outstanding |  |  | 441.3 |  |  |  | 446.1 |
Dilutive effect of equity-based compensation awards and other contingently issuable shares(a) |  |  | 2.8 |  |  |  | 2.5 |
Weighted average diluted common shares outstanding |  |  | 444.1 |  |  |  | 448.6 |
Potentially issuable shares |  |  | 9.2 |  |  |  | 11.2 |
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding |  |  | 3.0 |  |  |  | 2.5 |
(a) | As of January 1, 2017, we adopted ASU 2016-09 prospectively and no longer include excess tax benefits as assumed proceeds. See Note 1 for further discussion.

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