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Earnings (Loss) Per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Calculation of Earnings Per Share | The following table sets forth the calculation of EPS for the years ended December 31, 2020, 2019 and 2018 (in millions, except share and per share data):
|  | Years Ended December 31,
|  | 2020 |  | 2019 |  | 2018
Weighted average basic common shares outstanding |  | 17,754,666 |  |  | 17,917,195 |  |  | 19,452,560 |
Dilutive effect of stock-based awards and employee stock purchases |  | 51,912 |  |  | 18,879 |  |  | 8,492 |
Weighted average dilutive common shares outstanding |  | 17,806,578 |  |  | 17,936,074 |  |  | 19,461,052 |
Basic: |  |  |  |  |  |
Net income (loss) |  | $ | 286.5 |  |  | $ | 174.0 |  |  | $ | 157.8 |
Less: Earnings (loss) allocated to participating securities |  | 10.3 |  |  | 6.4 |  |  | 5.4 |
Net income (loss) available to basic common shares |  | $ | 276.2 |  |  | $ | 167.6 |  |  | $ | 152.4 |
Basic earnings (loss) per common share |  | $ | 15.55 |  |  | $ | 9.35 |  |  | $ | 7.83 |
Diluted: |  |  |  |  |  |
Net income (loss) |  | $ | 286.5 |  |  | $ | 174.0 |  |  | $ | 157.8 |
Less: Earnings (loss) allocated to participating securities |  | 10.3 |  |  | 6.4 |  |  | 5.4 |
Net income (loss) available to diluted common shares |  | $ | 276.2 |  |  | $ | 167.6 |  |  | $ | 152.4 |
Diluted earnings (loss) per common share |  | $ | 15.51 |  |  | $ | 9.34 |  |  | $ | 7.83 |

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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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