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Net Income Per Common Share Computations (Tables) | 12 Months Ended
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Dec. 31, 2016
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | The following is a reconciliation of the numerator and denominator of the net income per common share computations:
| Years Ended December 31,
(in millions, except per share data) | 2016 |  | 2015 |  | 2014
Numerator for basic income per common share: |  |  |  |  |
Net income | $ | 108.1 |  |  | $ | 65.2 |  |  | $ | 46.4 |
Net income allocated to participating securities | (1.0 | ) |  | (0.6 | ) |  | (0.3 | )
Numerator for basic net income per common share | $ | 107.1 |  |  | $ | 64.6 |  |  | $ | 46.1 |
Numerator for diluted income per common share | $ | 108.1 |  |  | $ | 65.2 |  |  | $ | 46.4 |
Denominator for net income per common share: |  |  |  |  |
Basic | 16.4 |  |  | 17.2 |  |  | 17.3 |
Plus dilutive effect of stock options and restricted stock | 0.2 |  |  | 0.1 |  |  | 0.1 |
Plus dilutive effect of participating securities | 0.2 |  |  | 0.3 |  |  | 0.2 |
Diluted | 16.8 |  |  | 17.6 |  |  | 17.6 |
Income per common share: |  |  |  |  |
Basic | $ | 6.52 |  |  | $ | 3.75 |  |  | $ | 2.67 |
Diluted | $ | 6.42 |  |  | $ | 3.71 |  |  | $ | 2.64 |

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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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