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Net Income per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Summary of Earnings Per Share Basic and Diluted |
|  | Quarter Ended March 31, |
(In millions, except per share data) |  | 2018 |  |  | 2017 |
Basic net income per common share: |  |  |  |  |  |  |  |
Net income |  | $ | 61.6 |  |  | $ | 64.6 |
Weighted average common shares outstanding |  |  | 90.0 |  |  |  | 91.4 |
Basic net income per common share |  | $ | 0.68 |  |  | $ | 0.71 |
Diluted net income per common share: |  |  |  |  |  |  |  |
Net income |  |  | 61.6 |  |  |  | 64.6 |
Weighted average common shares outstanding — Basic |  |  | 90.0 |  |  |  | 91.4 |
Plus incremental shares from assumed conversions: |  |  |  |  |  |  |  |
Restricted stock units |  |  | 0.5 |  |  |  | 0.5 |
Stock options |  |  | 0.7 |  |  |  | 1.0 |
Weighted average common shares outstanding — Dilutive |  |  | 91.2 |  |  |  | 92.9 |
Diluted net income per common share |  | $ | 0.68 |  |  | $ | 0.70 |

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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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