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Earnings per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2017
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 common share:
Year Ended December 31, | 2017 |  | 2016 |  | 2015
Net income, basic and diluted | $ | 106.5 |  |  | $ | 95.6 |  |  | $ | 86.8 |
Weighted average common shares outstanding for basic earnings per share computation | 51,429,366 |  |  | 44,511,774 |  |  | 45,184,091 |
Dilutive effects of stock-based compensation | 473,843 |  |  | 398,622 |  |  | 462,327 |
Weighted average common shares outstanding for diluted earnings per common share computation | 51,903,209 |  |  | 44,910,396 |  |  | 45,646,418 |
Basic earnings per common share | $ | 2.07 |  |  | $ | 2.15 |  |  | $ | 1.92 |
Diluted earnings per common share | 2.05 |  |  | 2.13 |  |  | 1.90 |

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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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