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Net Income Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2019, 2018 and 2017, are as follows:
(In millions, except per share data) |  | 2019 |  |  | 2018 |  |  | 2017 |
Basic net income per common share: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 306.6 |  |  | $ | 276.6 |  |  | $ | 284.0 |
Weighted average common shares outstanding |  |  | 84.9 |  |  |  | 87.9 |  |  |  | 90.6 |
Basic net income per common share |  | $ | 3.61 |  |  | $ | 3.15 |  |  | $ | 3.13 |
Diluted net income per common share: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding — Basic |  |  | 84.9 |  |  |  | 87.9 |  |  |  | 90.6 |
Plus incremental shares from assumed conversions: |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units |  |  | 0.3 |  |  |  | 0.4 |  |  |  | 0.4 |
Stock options |  |  | 0.6 |  |  |  | 0.7 |  |  |  | 0.9 |
Weighted average common shares outstanding — Dilutive |  |  | 85.8 |  |  |  | 89.0 |  |  |  | 91.9 |
Dilutive net income per common share |  | $ | 3.57 |  |  | $ | 3.11 |  |  | $ | 3.09 |
Anti-dilutive shares outstanding, excluded from computation |  | 0.1 |  |  | 0.2 |  |  | 0.2 |

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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://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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