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(Loss) Earnings Per Common Share - Summary of Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
(Loss) earnings per common share—basic      
Net (loss) income $ (1,447.7) $ 95.0 $ 157.9
Weighted-average common shares outstanding—basic (in shares) 183.7 185.0 184.9
(Loss) earnings per common share—basic (in dollars per share) $ (7.88) $ 0.51 $ 0.85
Earnings per common share—diluted      
Net (loss) income $ (1,447.7) $ 95.0 $ 157.9
Interest expense 0.0 6.5 6.4
Net (loss) income attributable to earnings per common share—diluted $ (1,447.7) $ 101.5 $ 164.3
Weighted-average common shares outstanding—basic (in shares) 183.7 185.0 184.9
Incremental shares for assumed conversion of Convertible Notes (in shares) 0.0 14.7 14.7
Outstanding options, restricted stock units and performance share units (in shares) 0.0 1.4 1.7
Weighted-average common shares outstanding—diluted (in shares) 183.7 201.1 201.3
(Loss) earnings per common share—diluted (in dollars per share) $ (7.88) $ 0.50 $ 0.82