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Earnings per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings per Share | The following table sets forth the computation of basic and diluted earnings per share for the three month periods ended March 31, 2018 and 2017:
| Three Months Ended March 31,
| 2018 | 2017
Net income | $ | 36.7 |  | $ | 23.2 |
Weighted average common shares outstanding for basic earnings per share computation | 56,241,201 |  | 44,680,258 |
Dilutive effects of stock-based compensation | 410,977 |  | 558,650 |
Weighted average common shares outstanding for diluted earnings per common share computation | 56,652,178 |  | 45,238,908 |
Basic earnings per common share | $ | 0.65 |  | $ | 0.52 |
Diluted earnings per common share | $ | 0.65 |  | $ | 0.51 |
Anti-dilutive unvested time restricted stock | 139,943 |  | 96,897 |

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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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