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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Earnings per common share—basic      
Net income (loss) $ 95.0 $ 157.9 $ 322.0
Weighted-average common shares outstanding—basic (in shares) 185.0 184.9 169.1
Basic earnings (loss) per common share (in dollars per share) $ 0.51 $ 0.85 $ 1.90
Earnings per common share—diluted      
Net income $ 95.0 $ 157.9 $ 322.0
Interest expense 6.5 6.4 0.0
Net income attributable to earnings per common share—diluted $ 101.5 $ 164.3 $ 322.0
Weighted-average common shares outstanding—basic (in shares) 185.0 184.9 169.1
Weighted-average shares outstanding - Convertible Notes (in shares) 14.7 14.7 5.9
Outstanding options, restricted stock units and performance share units (in shares) 1.4 1.7 1.9
Weighted-average common shares outstanding—diluted (in shares) 201.1 201.3 176.9
Earnings per common share—diluted (in dollars per share) $ 0.50 $ 0.82 $ 1.82