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Net Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2023
Earnings Per Share [Abstract] |
Calculations of Net Earnings (Loss) Per Share - Basic and Diluted | The calculations of net earnings per share - basic and net earnings per share - diluted were as follows:
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Net earnings available to common shareholders |  | $ | 30.3 |  |  | $ | 111.3 |  |  | $ | 173.3 |  |  | $ | 325.1 |
Weighted-average common shares outstanding (in millions) |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding - basic |  |  | 49.5 |  |  |  | 51.7 |  |  |  | 50.1 |  |  |  | 52.6 |
Effect of dilutive securities - share-based awards |  |  | 0.6 |  |  |  | 0.6 |  |  |  | 0.6 |  |  |  | 0.7 |
Weighted-average common shares outstanding - diluted |  |  | 50.1 |  |  |  | 52.3 |  |  |  | 50.7 |  |  |  | 53.3 |
Net earnings per share - basic |  | $ | 0.61 |  |  | $ | 2.15 |  |  | $ | 3.46 |  |  | $ | 6.18 |
Net earnings per share - diluted |  | $ | 0.60 |  |  | $ | 2.13 |  |  | $ | 3.42 |  |  | $ | 6.10 |

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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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