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Earnings (Loss) per Share - Calculation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Calculation of basic earnings (loss) per share: |  |
Net income (loss) applicable to common stock | $ 90.5 | $ (608.6)
Weighted average common shares outstanding - basic (in shares) | 155.7 | 115.7
Basic earnings (loss) per share (in dollars per share) | $ 0.58 | $ (5.26)
Calculation of diluted earnings (loss) per share: |  |
Net income (loss) applicable to common stock | $ 90.5 | $ (608.6)
Convertible Notes | 4.3 | 0.0
Diluted income (loss) applicable to common stock | $ 94.8 | $ (608.6)
Weighted average common shares outstanding - diluted (in shares) | 172.8 | 115.7
Diluted earnings (loss) per share (in dollars per share) | $ 0.55 | $ (5.26)
Effective tax rate | 18.50% | 14.10%
Convertible Notes |  |
Calculation of diluted earnings (loss) per share: |  |
Effective tax rate | 20.00% |

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