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(Loss) Earnings Per Common Share - Schedule of Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
(Loss) earnings per common share—basic                
Net (loss) income $ (14.7) $ 20.3 $ 2.1 $ (3.6) $ 62.1 $ 6.5 $ 7.7 $ 65.0
Weighted-average common shares outstanding—basic (in shares) 183.9     183.8     183.7 183.7
(Loss) earnings per common share—basic (in dollars per share) $ (0.08)     $ (0.02)     $ 0.04 $ 0.35
(Loss) earnings per common share—diluted                
Net (loss) income $ (14.7) $ 20.3 $ 2.1 $ (3.6) $ 62.1 $ 6.5 $ 7.7 $ 65.0
Interest expense attributable to convertible notes, net of tax 0.0     0.0     0.0 4.9
Net (loss) income attributable to (loss) earnings per common share—diluted $ (14.7)     $ (3.6)     $ 7.7 $ 69.9
Weighted-average common shares outstanding—basic (in shares) 183.9     183.8     183.7 183.7
Incremental shares for assumed conversion of Convertible Notes (in shares) 0.0     0.0     0.0 14.7
Outstanding options, restricted stock units and performance share units (in shares) 0.0     0.0     1.5 0.9
Weighted-average common shares outstanding—diluted (in shares) 183.9     183.8     185.2 199.3
(Loss) earnings per common share—diluted (in dollars per share) $ (0.08)     $ (0.02)     $ 0.04 $ 0.35