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Income Per Common Share Computations (Tables) | 9 Months Ended
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Sep. 30, 2016
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted |
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in millions, except per share data) | 2016 |  | 2015 |  | 2016 |  | 2015
Numerator for basic income per common share: |  |  |  |  |  |  |
Net income | $ | 8.7 |  |  | $ | 4.2 |  |  | $ | 81.3 |  |  | $ | 57.7 |
Net income allocated to participating securities | (0.1 | ) |  | — |  |  | (1.4 | ) |  | (0.9 | )
Numerator for basic income per common share | $ | 8.6 |  |  | $ | 4.2 |  |  | $ | 79.9 |  |  | $ | 56.8 |
Numerator for diluted income per common share | $ | 8.7 |  |  | $ | 4.2 |  |  | $ | 81.3 |  |  | $ | 57.7 |
Denominator for basic and diluted net income per common share: |  |  |  |  |  |  |
Basic | 16.4 |  |  | 17.3 |  |  | 16.5 |  |  | 17.3 |
Plus dilutive effect of stock options and restricted stock | 0.2 |  |  | 0.2 |  |  | 0.2 |  |  | 0.1 |
Plus dilutive effect of participating securities | 0.3 |  |  | 0.3 |  |  | 0.3 |  |  | 0.3 |
Diluted | 16.9 |  |  | 17.8 |  |  | 17.0 |  |  | 17.7 |
Income per common share: |  |  |  |  |  |  |
Basic | $ | 0.52 |  |  | $ | 0.24 |  |  | $ | 4.85 |  |  | $ | 3.28 |
Diluted | $ | 0.52 |  |  | $ | 0.24 |  |  | $ | 4.79 |  |  | $ | 3.26 |

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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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