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Net (Loss) Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2025
Earnings Per Share [Abstract] |
Calculations of Net (Loss) Earnings Per Share - Basic and Diluted | The calculation of net (loss) earnings per share - basic and net (loss) earnings per share - diluted were as follows:
Year Ended December 31 |  | 2025 |  |  | 2024 |  |  | 2023 |
Net (loss) earnings available to common shareholders: |  | $ | (13.3 | ) |  | $ | 145.1 |  |  | $ | 88.8 |
Weighted-average common shares outstanding (in millions): |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding – basic |  |  | 46.6 |  |  |  | 47.8 |  |  |  | 49.8 |
Effect of share-based awards |  |  | — |  |  |  | 0.5 |  |  |  | 0.6 |
Weighted-average common shares outstanding – diluted |  |  | 46.6 |  |  |  | 48.3 |  |  |  | 50.4 |
Net (loss) earnings per share – basic |  | $ | (0.29 | ) |  | $ | 3.04 |  |  | $ | 1.78 |
Net (loss) earnings per share – diluted |  | $ | (0.29 | ) |  | $ | 3.01 |  |  | $ | 1.76 |

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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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