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Net Income Per Share | 9 Months Ended
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Sep. 30, 2015
Earnings Per Share [Abstract] |
Net Income Per Share | Net Income Per Share The following table reconciles net income and shares used in the calculation of basic net income per share to those used for diluted net income per share:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(In millions) | 2015 |  | 2014 |  | 2015 |  | 2014
Net income | $ | 1.5 |  |  | $ | 31.0 |  |  | $ | 62.2 |  |  | $ | 95.7 |
Denominator: |  |  |  |  |  |  |
Weighted average common shares outstanding | 72.2 |  |  | 71.0 |  |  | 71.9 |  |  | 70.8 |
Dilutive effect of stock options, stock appreciation rights and performance share awards, based on the treasury stock method | 1.7 |  |  | 1.6 |  |  | 1.7 |  |  | 1.7 |
Weighted average shares assuming dilution | 73.9 |  |  | 72.6 |  |  | 73.6 |  |  | 72.5 |
During the three months ended September 30, 2015 and 2014, there were 0.8 million and 0.6 million shares, respectively, not included in the computation of diluted net income per share because their impact was antidilutive. There were 0.6 million and 0.5 million antidilutive shares outstanding during the nine months ended September 30, 2015 and 2014, respectively.

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