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Net Income Per Share | 3 Months Ended
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Mar. 31, 2014
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) | 2014 |  | 2013
Numerator: |  |  |
Net income | $ | 27.1 |  |  | $ | 31.7 |
Denominator: |  |  |
Weighted average common shares outstanding | 70.6 |  |  | 69.0 |
Dilutive effect of stock options, stock appreciation rights and performance share awards, based on the treasury stock method | 1.7 |  |  | 1.2 |
Assumed conversion of convertible debt, based on the if-converted method | — |  |  | 0.1 |
Weighted average shares assuming dilution | 72.3 |  |  | 70.3 |
Under the "if-converted" method, the after-tax effect of interest expense related to convertible debt is added back to net income. During both periods presented, the add-back amount was immaterial. In addition, during the three months ended March 31, 2014 and 2013, there were 0.2 million and 0.4 million shares, respectively, not included in the computation of diluted net income per share, because their impact was antidilutive.

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