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Net Earnings (Loss) Per Share (Tables) | 9 Months Ended
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Sep. 30, 2021
Earnings Per Share [Abstract] |
Calculations of Net Earnings (Loss) Per Share - Basic and Diluted | The calculations of net earnings (loss) per share - basic and net earnings (loss) per share - diluted were as follows:
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Net earnings (loss) available to common shareholders |  | $ | 97.7 |  |  | $ | 10.3 |  |  | $ | 271.3 |  |  | $ | (52.4 | )
Weighted-average common shares outstanding (in millions) |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding - basic |  |  | 54.3 |  |  |  | 58.2 |  |  |  | 54.7 |  |  |  | 58.4 |
Effect of dilutive securities - stock options |  |  | 0.2 |  |  |  | — |  |  |  | 0.1 |  |  |  | — |
Effect of other share-based awards |  |  | 0.7 |  |  |  | 0.3 |  |  |  | 0.6 |  |  |  | — |
Weighted-average common shares outstanding - diluted |  |  | 55.2 |  |  |  | 58.5 |  |  |  | 55.4 |  |  |  | 58.4 |
Net earnings (loss) per share - basic |  | $ | 1.80 |  |  | $ | 0.18 |  |  | $ | 4.96 |  |  | $ | (0.90 | )
Net earnings (loss) per share - diluted |  | $ | 1.77 |  |  | $ | 0.18 |  |  | $ | 4.90 |  |  | $ | (0.90 | )

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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 http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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