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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2019
Earnings Per Share [Abstract] |
Reconciliation of Shares Used to Compute Basic and Diluted Earnings per Share | The following is a reconciliation of the shares used to compute basic and diluted earnings per share (in millions):
|  | Three Months Ended
|  | March 31,
|  | 2019 |  | 2018
Weighted average number of common shares outstanding used to compute basic earnings per share |  | 52.6 |  |  | 52.2 |
Dilutive effect of stock-based awards |  | 0.6 |  |  | 0.6 |
Number of shares used to compute diluted earnings per share |  | 53.2 |  |  | 52.8 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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