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Earnings per Common Share - Tables | 12 Months Ended
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Dec. 31, 2020
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, | 2020 |  | 2019 |  | 2018
Net income, basic and diluted | $ | 161.2 |  |  | $ | 181.0 |  |  | $ | 160.2 |
Weighted average common shares outstanding for basic earnings per share computation | 63,611,891 |  |  | 63,645,029 |  |  | 57,778,857 |
Dilutive effects of stock-based compensation | 117,579 |  |  | 239,839 |  |  | 438,266 |
Weighted average common shares outstanding for diluted earnings per common share computation | 63,729,470 |  |  | 63,884,868 |  |  | 58,217,123 |
Basic earnings per common share | $ | 2.53 |  |  | $ | 2.84 |  |  | $ | 2.77 |
Diluted earnings per common share | 2.53 |  |  | 2.83 |  |  | 2.75 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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