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Net Income Per Share (Tables) | 6 Months Ended
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Jun. 30, 2014
Earnings Per Share [Abstract] |
Reconciliation of Basic to Diluted 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 June 30, |  | Six Months Ended June 30,
(In millions) | 2014 |  | 2013 |  | 2014 |  | 2013
Numerator: |  |  |  |  |  |  |
Net income | $ | 37.6 |  |  | $ | 30.2 |  |  | $ | 64.7 |  |  | $ | 61.9 |
Denominator: |  |  |  |  |  |  |
Weighted average common shares outstanding | 70.8 |  |  | 69.5 |  |  | 70.7 |  |  | 69.2 |
Dilutive effect of stock options, stock appreciation rights and performance share awards, based on the treasury stock method | 1.6 |  |  | 1.3 |  |  | 1.7 |  |  | 1.3 |
Assumed conversion of convertible debt, based on the if-converted method | — |  |  | — |  |  | — |  |  | 0.1 |
Weighted average shares assuming dilution | 72.4 |  |  | 70.8 |  |  | 72.4 |  |  | 70.6 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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