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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2016
Earnings Per Share [Abstract] |
Summary of Earnings Per Share | Per share amounts are computed as follows:
|  | 2016 |  |  | 2015 |  |  | 2014 |
Numerator (in millions): |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders |  | $ | 81.3 |  |  | $ | 119.5 |  |  | $ | 84.1 |
Denominator (in thousands): |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  | 23,998 |  |  |  | 24,107 |  |  |  | 24,391 |
Dilutive effect of stock options and awards |  |  | 444 |  |  |  | 505 |  |  |  | 487 |
Denominator for diluted earnings per share |  |  | 24,442 |  |  |  | 24,612 |  |  |  | 24,878 |
Net income per share, basic: |  | $ | 3.39 |  |  | $ | 4.96 |  |  | $ | 3.45 |
Net income per share, diluted: |  | $ | 3.33 |  |  | $ | 4.86 |  |  | $ | 3.38 |

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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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