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Net Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2022
Earnings Per Share [Abstract] |
Calculations of Net Earnings Per Share - Basic and Diluted | The calculation of net earnings per share - basic and net earnings per share - diluted were as follows:
Year Ended December 31 |  | 2022 |  |  | 2021 |  |  | 2020 |
Net earnings available to common shareholders: |  | $ | 373.8 |  |  | $ | 382.4 |  |  | $ | 23.8 |
Weighted-average common shares outstanding (in millions): |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding - basic |  |  | 52.2 |  |  |  | 54.5 |  |  |  | 58.0 |
Effect of dilutive securities - stock options |  |  | — |  |  |  | 0.2 |  |  |  | — |
Effect of other share-based awards |  |  | 0.6 |  |  |  | 0.7 |  |  |  | 0.3 |
Weighted-average common shares outstanding - diluted |  |  | 52.8 |  |  |  | 55.4 |  |  |  | 58.3 |
Net earnings per share - basic |  | $ | 7.17 |  |  | $ | 7.01 |  |  | $ | 0.41 |
Net earnings per share - diluted |  | $ | 7.08 |  |  | $ | 6.91 |  |  | $ | 0.41 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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