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Earnings Per Share | 12 Months Ended
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Dec. 31, 2023
Earnings Per Share [Abstract] |
Earnings Per Share | 5. Earnings Per Share The following table sets forth the computation of basic and diluted income per common share for the periods presented (dollars and shares in millions, except per share data).
|  | Year Ended December 31, |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Numerator: |  |  |  |  |  |  |  |  |
Net income |  | $ | 765.2 |  |  | $ | 1,029.8 |  |  | $ | 841.1 |
Less: distributed and undistributed earnings allocated to participating securities |  |  | (6.2 | ) |  |  | (7.9 | ) |  |  | (6.4 | )
Net income attributable to common stockholders |  | $ | 759.0 |  |  | $ | 1,021.9 |  |  | $ | 834.7 |
Denominator: |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  | 89.1 |  |  |  | 92.3 |  |  |  | 94.1 |
Effect of dilutive securities |  |  | 0.4 |  |  |  | 0.4 |  |  |  | 0.4 |
Diluted common shares outstanding |  |  | 89.5 |  |  |  | 92.7 |  |  |  | 94.5 |
Basic income per common share |  | $ | 8.52 |  |  | $ | 11.08 |  |  | $ | 8.87 |
Diluted income per common share |  | $ | 8.48 |  |  | $ | 11.03 |  |  | $ | 8.83 |

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