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Earnings Per Share | 12 Months Ended
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Dec. 31, 2022
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share Basic earnings per share has been computed based upon the weighted average number of common shares outstanding. Diluted earnings per share has been computed based upon the weighted average number of common shares outstanding plus the effect of all potentially dilutive common stock equivalents, except when the effect would be anti-dilutive. The following table sets forth the computation of basic and diluted earnings per share (in millions, except per share data).
| Years Ended December 31,
| 2022 |  | 2021 |  | 2020
Basic and diluted earnings per share: |  |  |  |  |
Numerator: |  |  |  |  |
Net income, basic and diluted | $ | 329.9 |  |  | $ | 224.1 |  |  | $ | 73.7 |
Denominator: |  |  |  |  |
Basic weighted average common shares | 29.6 |  |  | 29.6 |  |  | 29.1 |
Stock options, RSUs and PSUs | 0.6 |  |  | 0.8 |  |  | 0.3 |
Weighted average shares used to calculate diluted earnings per share | 30.2 |  |  | 30.4 |  |  | 29.4 |
Earnings per share: |  |  |  |  |
Basic | $ | 11.15 |  |  | $ | 7.57 |  |  | $ | 2.53 |
Diluted | $ | 10.92 |  |  | $ | 7.37 |  |  | $ | 2.51 |
Antidilutive stock options, RSUs and PSUs | 0.1 |  |  | — |  |  | 0.4 |

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