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Earnings (Loss) per Share - Calculation of Basic and Diluted EPS (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Calculation of basic earnings (loss) per share:      
Net income (loss) applicable to common stock $ (311.5) $ (490.0) $ 221.2
Weighted-average common shares outstanding - basic (in shares) 152.1 152.1 161.2
Basic earnings (loss) per share (in dollars per share) $ (2.05) $ (3.22) $ 1.37
Calculation of diluted earnings (loss) per share:      
Net income (loss) applicable to common stock $ (311.5) $ (490.0) $ 221.2
Convertible Notes 0.0 0.0 7.2
Diluted income applicable to common stock $ (311.5) $ (490.0) $ 228.4
Weighted-average common shares outstanding - diluted (in shares) 152.1 152.1 176.6
Diluted earnings (loss) per share (in dollars per share) $ (2.05) $ (3.22) $ 1.29
Effective Tax Rate 8.20% 1.70% (26.50%)
Common Stock, Non-Exchangeable      
Calculation of basic earnings (loss) per share:      
Weighted-average common shares outstanding - basic (in shares) 151.6 151.5 160.6
Common Stock, Exchangeable      
Calculation of basic earnings (loss) per share:      
Weighted-average common shares outstanding - basic (in shares) 0.5 0.6 0.6
Convertible Notes      
Calculation of diluted earnings (loss) per share:      
Effective Tax Rate     21.00%