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Net Earnings (Loss) Per Share | 9 Months Ended
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Sep. 30, 2021
Earnings Per Share [Abstract] |
Net Earnings (Loss) Per Share | (8) Net Earnings (Loss) Per Share 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 | )
There were 0.1 million and 0.7 million share-based awards excluded from the calculation of net earnings (loss) per share - diluted for the three months ended September 30, 2021 and 2020, respectively, because their impact was anti-dilutive. There were 0.2 million and 1.5 million share-based awards excluded from the calculation of net earnings (loss) per share - diluted for the nine months ended September 30, 2021 and 2020, respectively, because their impact was anti-dilutive. Due to the net loss for the nine months ended September 30, 2020, the assumed exercise of share-based awards had an anti-dilutive effect and therefore were not included in the calculations of net loss per share - diluted for the nine months ended September 30, 2020.

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