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Net Earnings Per Share | 6 Months Ended
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Jun. 30, 2020
Earnings Per Share [Abstract] |
Net (Loss) Earnings Per Share | (8) Net (Loss) Earnings Per Share The calculations of net (loss) earnings per share - basic and net earnings per share - diluted were as follows:
|  | 3 Months Ended |  |  | 6 Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Net (loss) earnings available to common shareholders |  | $ | (64.4 | ) |  | $ | 127.3 |  |  | $ | (62.7 | ) |  | $ | 180.8 |
Weighted-average common shares outstanding (in millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding - basic |  |  | 58.2 |  |  |  | 60.0 |  |  |  | 58.5 |  |  |  | 60.3 |
Effect of dilutive securities - stock options |  |  | — |  |  |  | 0.1 |  |  |  | — |  |  |  | 0.1 |
Effect of other share-based awards |  |  | — |  |  |  | 0.3 |  |  |  | — |  |  |  | 0.3 |
Weighted-average common shares outstanding - diluted |  |  | 58.2 |  |  |  | 60.4 |  |  |  | 58.5 |  |  |  | 60.7 |
Net (loss) earnings per share - basic |  | $ | (1.11 | ) |  | $ | 2.12 |  |  | $ | (1.07 | ) |  | $ | 3.00 |
Net (loss) earnings per share - diluted |  | $ | (1.11 | ) |  | $ | 2.11 |  |  | $ | (1.07 | ) |  | $ | 2.98 |
Due to the net loss for the three months and six months ended June 30, 2020, the assumed exercise of share-based awards had an anti-dilutive effect and therefore was not included in the calculations of net loss per share – diluted for the three months and six months ended June 30, 2020. There were 1.1 million and 0.4 million share-based awards excluded from the calculation of net (loss) earnings per share - diluted for the three months ended June 30, 2020 and 2019, respectively, and 0.9 million and 0.4 million share-based awards excluded from the calculation of net (loss) earnings per share - diluted for the six months ended June 30, 2020 and 2019, respectively, because their impact was anti-dilutive.

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