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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2023
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Income Per Common 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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- 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/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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