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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2025
Earnings Per Share [Abstract] |
Computation of basic and diluted net income per common share | The following table shows the computation of our basic and diluted earnings per common share (in millions, except per share amounts):
| Three Months Ended September 30 |  | Nine Months Ended September 30
| 2025 |  | 2024 |  | 2025 |  | 2024
Basic earnings per share: |  |  |  |  |  |  |
Net income | $ | 82.2 |  |  | $ | 89.0 |  |  | $ | 236.3 |  |  | $ | 207.7 |
Less: Net income allocated to participating securities | (1.3) |  |  | (1.5) |  |  | (4.0) |  |  | (3.7) |
Net income available to common shareholders | $ | 80.9 |  |  | $ | 87.5 |  |  | $ | 232.3 |  |  | $ | 204.0 |
Weighted-average shares outstanding - basic | 35.9 |  |  | 35.8 |  |  | 35.9 |  |  | 35.8 |
Basic earnings per share | $ | 2.25 |  |  | $ | 2.44 |  |  | $ | 6.47 |  |  | $ | 5.70 |
Diluted earnings per share: |  |  |  |  |  |  |
Net income | $ | 82.2 |  |  | $ | 89.0 |  |  | $ | 236.3 |  |  | $ | 207.7 |
Less: Net income allocated to participating securities | (1.3) |  |  | (1.5) |  |  | (4.0) |  |  | (3.7) |
Net income available to common shareholders | $ | 80.9 |  |  | $ | 87.5 |  |  | $ | 232.3 |  |  | $ | 204.0 |
Weighted-average shares outstanding - basic | 35.9 |  |  | 35.8 |  |  | 35.9 |  |  | 35.8 |
Effect of dilutive securities: |  |  |  |  |  |  |
Equity compensation plans | 0.1 |  |  | 0.1 |  |  | 0.1 |  |  | 0.1 |
Weighted-average shares outstanding - diluted | 36.0 |  |  | 35.9 |  |  | 36.0 |  |  | 35.9 |
Diluted earnings per share | $ | 2.25 |  |  | $ | 2.43 |  |  | $ | 6.46 |  |  | $ | 5.68 |

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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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