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Net Income per Common Share | 9 Months Ended
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Sep. 30, 2016
Earnings Per Share [Abstract] |
Net Income Per Common Share | Note 2 — Net Income per Common Share
|  | Quarter Ended September 30, |  |  | Nine Months Ended September 30, |
(In millions, except per share data) |  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
Basic net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 68.2 |  |  | $ | 53.5 |  |  | $ | 190.3 |  |  | $ | 183.3 |
Weighted average common shares outstanding |  |  | 92.7 |  |  |  | 95.8 |  |  |  | 93.1 |  |  |  | 96.2 |
Basic net income per common share |  | $ | 0.74 |  |  | $ | 0.56 |  |  | $ | 2.04 |  |  | $ | 1.91 |
Diluted net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 68.2 |  |  | $ | 53.5 |  |  | $ | 190.3 |  |  | $ | 183.3 |
Weighted average common shares outstanding — Basic |  |  | 92.7 |  |  |  | 95.8 |  |  |  | 93.1 |  |  |  | 96.2 |
Plus incremental shares from assumed conversions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units |  |  | 0.4 |  |  |  | 0.5 |  |  |  | 0.5 |  |  |  | 0.5 |
Stock options |  |  | 1.0 |  |  |  | 1.0 |  |  |  | 1.0 |  |  |  | 1.0 |
Weighted average common shares outstanding — Dilutive |  |  | 94.1 |  |  |  | 97.3 |  |  |  | 94.6 |  |  |  | 97.7 |
Dilutive net income per common share |  | $ | 0.72 |  |  | $ | 0.55 |  |  | $ | 2.01 |  |  | $ | 1.88 |
Total shares underlying stock options of 0.4 million and 0.5 million were excluded from the computation of diluted net income per share for the quarter and nine months ended September 30, 2016, respectively, as they were anti-dilutive. Total shares underlying stock options of 0.1 million were excluded from the computation of diluted net income per share for the quarter and nine months ended September 30, 2015 as they were anti-dilutive.

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