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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2012
Earnings Per Share [Abstract] |
Calculation of basic and diluted earnings per share | Basic and diluted earnings per share for 2012, 2011 and 2010 were calculated as follows:
|  | Year Ended December 31,
|  | 2012 |  | 2011 |  | 2010
Numerator: |  |  |  |  |  |  |
Net income |  | $ | 85.8 |  |  | $ | 25.1 |  |  | $ | 12.0 |
Less: Net income attributable to participating securities |  | — |  |  | — |  |  | (0.1 | )
Net income available to common stockholders |  | $ | 85.8 |  |  | $ | 25.1 |  |  | $ | 11.9 |
Denominator - Weighted-average common shares outstanding (in thousands): |  |  |  |  |  |
Basic 1 |  | 19,115 |  |  | 18,979 |  |  | 19,377 |
Diluted 2 |  | 19,278 |  |  | 18,979 |  |  | 19,377 |
Earnings per common share, Basic: |  |  |  |  |  |
Net income per share |  | $ | 4.49 |  |  | $ | 1.32 |  |  | $ | 0.61 |
Earnings per common share, Diluted: |  |  |  |  |  |
Net income per share 2 |  | $ | 4.45 |  |  | $ | 1.32 |  |  | $ | 0.61 |
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1 | The basic weighted-average number of common shares outstanding during the period excludes unvested share-based payment awards.
2 | The diluted weighted-average number of common shares outstanding and diluted earnings per share for 2012 were calculated using the treasury method. The diluted weighted-average number of common shares outstanding and diluted earnings per share for 2011 and 2010 were calculated using the two-class method (see Note 1).

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- Definition Tabular disclosure of the numerators and the denominators of the basic and diluted per-share (or per-unit) computations for income from continuing operations, including the effect that has been given to preferred dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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