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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2024
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):
|  | Three Months Ended |
|  | March 31, |
Numerator: |  | 2024 |  |  | 2023 |
Net income |  | $ | 146.9 |  |  | $ | 190.1 |
Less: Distributed and undistributed earnings allocated to participating securities |  |  | (1.0 | ) |  |  | (1.6 | )
Net income attributable to common shareholders |  | $ | 145.9 |  |  | $ | 188.5 |
Denominator: |  |  |  |  |  |
Weighted average basic common shares outstanding |  |  | 89.0 |  |  |  | 89.0 |
Effect of dilutive securities |  |  | 0.4 |  |  |  | 0.4 |
Weighted average diluted common shares outstanding |  |  | 89.4 |  |  |  | 89.4 |
Basic income per common share |  | $ | 1.64 |  |  | $ | 2.12 |
Diluted income per common share |  | $ | 1.63 |  |  | $ | 2.11 |

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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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