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Net Income Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Summary of Earnings Per Share Basic and Diluted | Computations of basic and diluted net income per common share for the years ended December 31, 2017, 2016 and 2015, are as follows:
(In millions, except per share data) |  | 2017 |  |  | 2016 |  |  | 2015 |
Basic net income per common share: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 284.0 |  |  | $ | 249.8 |  |  | $ | 237.2 |
Weighted average common shares outstanding |  |  | 90.6 |  |  |  | 92.8 |  |  |  | 95.8 |
Basic net income per common share |  | $ | 3.13 |  |  | $ | 2.69 |  |  | $ | 2.48 |
Diluted net income per common share: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding — Basic |  |  | 90.6 |  |  |  | 92.8 |  |  |  | 95.8 |
Plus incremental shares from assumed conversions: |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units |  |  | 0.4 |  |  |  | 0.4 |  |  |  | 0.5 |
Stock options |  |  | 0.9 |  |  |  | 1.0 |  |  |  | 0.9 |
Weighted average common shares outstanding — Dilutive |  |  | 91.9 |  |  |  | 94.2 |  |  |  | 97.2 |
Dilutive net income per common share |  | $ | 3.09 |  |  | $ | 2.65 |  |  | $ | 2.44 |
Anti-dilutive shares outstanding, excluded from computation |  | 0.2 |  |  | 0.4 |  |  |  | — |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + 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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