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Net Income per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2019
Earnings Per Share [Abstract] |
Summary of Earnings Per Share Basic and Diluted |
|  | Quarter Ended June 30, |  |  | Six Months Ended June 30, |
(In millions, except per share data) |  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Basic net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 80.9 |  |  | $ | 68.8 |  |  | $ | 153.1 |  |  | $ | 130.4 |
Weighted average common shares outstanding |  |  | 85.2 |  |  |  | 88.8 |  |  |  | 85.1 |  |  |  | 89.4 |
Basic net income per common share |  | $ | 0.95 |  |  | $ | 0.77 |  |  | $ | 1.80 |  |  | $ | 1.45 |
Diluted net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 80.9 |  |  | $ | 68.8 |  |  | $ | 153.1 |  |  | $ | 130.4 |
Weighted average common shares outstanding — Basic |  |  | 85.2 |  |  |  | 88.8 |  |  |  | 85.1 |  |  |  | 89.4 |
Plus incremental shares from assumed conversions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units |  |  | 0.4 |  |  |  | 0.4 |  |  |  | 0.4 |  |  |  | 0.4 |
Stock options |  |  | 0.6 |  |  |  | 0.7 |  |  |  | 0.6 |  |  |  | 0.7 |
Weighted average common shares outstanding — Dilutive |  |  | 86.2 |  |  |  | 89.9 |  |  |  | 86.1 |  |  |  | 90.5 |
Diluted net income per common share |  | $ | 0.94 |  |  | $ | 0.76 |  |  | $ | 1.78 |  |  | $ | 1.44 |

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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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