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Net Income Per Share (Tables) | 9 Months Ended
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Sep. 30, 2015
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 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 |

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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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