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Earnings Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2024
Earnings Per Share [Abstract] |
Computation of basic and diluted earnings per share | The computation of basic and diluted earnings per share follows.
| Year Ended December 31, 2024
| (in millions, except per share amounts)
| Income (Loss) |  | Average Shares |  | EPS
Net income | $ | 93.7 |  |  |  |  |
Unvested restricted share participation | (0.3) |  |  |  |  |
Net income per common share – basic | 93.4 |  |  | 48.6 |  |  | $ | 1.92 |
Effect of dilutive securities: |  |  |  |  |
Nonparticipating unvested restricted shares | — |  |  | 0.2 |  |  |
Net income per common share – diluted | $ | 93.4 |  |  | 48.8 |  |  | $ | 1.91 |
| Year Ended December 31, 2023
| (in millions, except per share amounts)
| Income (Loss) |  | Average Shares |  | EPS
Net income | $ | 159.2 |  |  |  |  |
Unvested restricted share participation | (0.6) |  |  |  |  |
Net income per common share – basic | 158.6 |  |  | 48.5 |  |  | $ | 3.27 |
Effect of dilutive securities: |  |  |  |  |
Nonparticipating unvested restricted shares | — |  |  | 0.2 |  |  |
Net income per common share – diluted | $ | 158.6 |  |  | 48.7 |  |  | $ | 3.26 |
| Year Ended December 31, 2022
| (in millions, except per share amounts)
| Income (Loss) |  | Average Shares |  | EPS
Net income | $ | 245.8 |  |  |  |  |
Unvested restricted share participation | (1.0) |  |  |  |  |
Net income per common share – basic | 244.8 |  |  | 48.2 |  |  | $ | 5.08 |
Effect of dilutive securities: |  |  |  |  |
Nonparticipating unvested restricted shares | — |  |  | 0.3 |  |  |
Net income per common share – diluted | $ | 244.8 |  |  | 48.5 |  |  | $ | 5.05 |

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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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