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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2017
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings Per Share | The following are the common share amounts used to compute the basic and diluted earnings per share for each period:
|  | For the Three Months Ended March 31, |
|  | 2017 |  |  | 2016 |
|  | (in millions) |
Weighted average shares used in basic computations |  |  | 83.1 |  |  |  | 82.8 |
Dilutive effect of exercise of equity grants outstanding |  |  | 3.6 |  |  |  | 2.8 |
Weighted average shares used in diluted computations |  |  | 86.7 |  |  |  | 85.6 |

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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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