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Net Income per Common Share | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Net Income Per Common Share | Note 2 — Net Income per Common Share
|  | Quarter Ended June 30, |  |  | Six Months Ended June 30, |
(In millions, except per share data) |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Basic net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 68.8 |  |  | $ | 61.6 |  |  | $ | 130.4 |  |  | $ | 126.2 |
Weighted average common shares outstanding |  |  | 88.8 |  |  |  | 90.7 |  |  |  | 89.4 |  |  |  | 91.1 |
Basic net income per common share |  | $ | 0.77 |  |  | $ | 0.68 |  |  | $ | 1.45 |  |  | $ | 1.39 |
Diluted net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  | 68.8 |  |  |  | 61.6 |  |  |  | 130.4 |  |  |  | 126.2 |
Weighted average common shares outstanding — Basic |  |  | 88.8 |  |  |  | 90.7 |  |  |  | 89.4 |  |  |  | 91.1 |
Plus incremental shares from assumed conversions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units |  |  | 0.4 |  |  |  | 0.4 |  |  |  | 0.4 |  |  |  | 0.4 |
Stock options |  |  | 0.7 |  |  |  | 0.9 |  |  |  | 0.7 |  |  |  | 0.9 |
Weighted average common shares outstanding — Dilutive |  |  | 89.9 |  |  |  | 92.0 |  |  |  | 90.5 |  |  |  | 92.4 |
Diluted net income per common share |  | $ | 0.76 |  |  | $ | 0.67 |  |  | $ | 1.44 |  |  | $ | 1.37 |
Total shares underlying stock options of 0.1 million were excluded from the computation of diluted net income per share for both the three and six months ended June 30, 2018, as they were anti-dilutive. Total shares underlying stock options of 0.1 million and 0.2 million, respectively, were excluded from the computation of diluted net income per share for the three and six months ended June 30, 2017, as they were anti-dilutive.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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