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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, 2023
Mar. 31, 2022
Earnings per common share—basic    
Net income $ 25.0 $ 86.7
Weighted-average common shares outstanding—basic (in shares) 185.2 185.1
Earnings (loss) per common share (in dollars per share) $ 0.13 $ 0.47
Earnings per common share—diluted    
Net income $ 25.0 $ 86.7
Interest expense 1.6 1.6
Net income attributable to earnings per common share—diluted $ 26.6 $ 88.3
Weighted-average common shares outstanding—basic (in shares) 185.2 185.1
Convertible notes weighted-average shares outstanding (in shares) 14.7 14.7
Outstanding options, restricted stock units and performance share units (in shares) 1.6 1.0
Weighted-average common shares outstanding—diluted (in shares) 201.5 200.8
Earnings (loss) per common share—diluted (in dollars per share) $ 0.13 $ 0.44