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Net Income Per Share | 3 Months Ended
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Mar. 31, 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 March 31,
(In millions) | 2015 |  | 2014
Numerator: |  |  |
Net income | $ | 32.9 |  |  | $ | 27.1 |
Denominator: |  |  |
Weighted average common shares outstanding | 71.7 |  |  | 70.6 |
Dilutive effect of stock options, stock appreciation rights and performance share awards, based on the treasury stock method | 1.6 |  |  | 1.7 |
Weighted average shares assuming dilution | 73.3 |  |  | 72.3 |
There were 0.8 million and 0.2 million antidilutive shares outstanding during the three months ended March 31, 2015 and 2014, respectively.

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