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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
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Earnings per common share—basic    
Net income $ 6.5 $ 25.0
Weighted-average common shares outstanding—basic (in shares) 183.7 185.2
Earnings (loss) per common share (in dollars per share) $ 0.04 $ 0.13
Earnings per common share—diluted    
Net income $ 6.5 $ 25.0
Interest expense attributable to convertible notes 0.0 1.6
Net income attributable to earnings per common share—diluted $ 6.5 $ 26.6
Weighted-average common shares outstanding—basic (in shares) 183.7 185.2
Convertible notes weighted-average shares outstanding (in shares) 0.0 14.7
Outstanding options, restricted stock units and performance share units (in shares) 0.7 1.6
Weighted-average common shares outstanding—diluted (in shares) 184.4 201.5
Earnings (loss) per common share—diluted (in dollars per share) $ 0.04 $ 0.13