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Income Per Common Share Computations (Tables) | 9 Months Ended
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Sep. 30, 2017
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) | 2017 |  | 2016 |  | 2017 |  | 2016
Numerator for basic income per common share: |  |  |  |  |  |  |
Net income | $ | 16.7 |  |  | $ | 8.7 |  |  | $ | 102.3 |  |  | $ | 81.3 |
Net income allocated to participating securities | — |  |  | (0.1 | ) |  | (0.1 | ) |  | (1.4 | )
Numerator for basic income per common share | $ | 16.7 |  |  | $ | 8.6 |  |  | $ | 102.2 |  |  | $ | 79.9 |
Numerator for diluted income per common share | $ | 16.7 |  |  | $ | 8.7 |  |  | $ | 102.3 |  |  | $ | 81.3 |
Denominator for basic and diluted net income per common share: |  |  |  |  |  |  |
Basic-weighted average shares | 15.3 |  |  | 16.4 |  |  | 15.9 |  |  | 16.5 |
Plus dilutive effect of stock awards | 0.2 |  |  | 0.2 |  |  | 0.2 |  |  | 0.2 |
Plus dilutive effect of participating securities | — |  |  | 0.3 |  |  | 0.1 |  |  | 0.3 |
Diluted-adjusted weighted average shares | 15.5 |  |  | 16.9 |  |  | 16.2 |  |  | 17.0 |
Income per common share: |  |  |  |  |  |  |
Basic | $ | 1.09 |  |  | $ | 0.52 |  |  | $ | 6.43 |  |  | $ | 4.85 |
Diluted | $ | 1.08 |  |  | $ | 0.52 |  |  | $ | 6.32 |  |  | $ | 4.79 |

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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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