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Net Earnings Per Share | 12 Months Ended
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Dec. 31, 2022
Earnings Per Share [Abstract] |
Net Earnings Per Share | (6) Net Earnings Per Share 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 |
There were 0.5 million, 0.1 million and 0.6 million share-based awards excluded from the calculation of net earnings per share - diluted for the years ended December 31, 2022, 2021 and 2020, respectively, because their impact was anti-dilutive.

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