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Net Income per Common Share (Tables) | 9 Months Ended
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Sep. 30, 2017
Earnings Per Share [Abstract] |
Summary of Earnings Per Share Basic and Diluted |
|  | Quarter Ended September 30, |  | Nine Months Ended September 30, |
(In millions, except per share data) |  | 2017 |  |  | 2016 |  | 2017 |  |  | 2016 |
Basic net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 69.7 |  |  | $ | 68.2 |  | $ | 195.9 |  |  | $ | 190.3 |
Weighted average common shares outstanding |  |  | 90.1 |  |  |  | 92.7 |  |  | 90.7 |  |  |  | 93.1 |
Basic net income per common share |  | $ | 0.77 |  |  | $ | 0.74 |  | $ | 2.16 |  |  | $ | 2.04 |
Diluted net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  | 69.7 |  |  |  | 68.2 |  |  | 195.9 |  |  |  | 190.3 |
Weighted average common shares outstanding — Basic |  |  | 90.1 |  |  |  | 92.7 |  |  | 90.7 |  |  |  | 93.1 |
Plus incremental shares from assumed conversions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units |  |  | 0.4 |  |  |  | 0.4 |  |  | 0.4 |  |  |  | 0.5 |
Stock options |  |  | 0.9 |  |  |  | 1.0 |  |  | 1.0 |  |  |  | 1.0 |
Weighted average common shares outstanding — Dilutive |  |  | 91.4 |  |  |  | 94.1 |  |  | 92.1 |  |  |  | 94.6 |
Diluted net income per common share |  | $ | 0.76 |  |  | $ | 0.72 |  | $ | 2.13 |  |  | $ | 2.01 |

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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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