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Earnings Per Share - Computation of Basic and Diluted Earnings (Loss) per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Numerator:      
Net income, basic and diluted $ 329.9 $ 224.1 $ 73.7
Denominator:      
Basic weighted average common shares (in shares) 29.6 29.6 29.1
Stock options, RSUs and PSUs (in shares) 0.6 0.8 0.3
Weighted average shares used to calculate diluted earnings per share (in shares) 30.2 30.4 29.4
Earnings per share:      
Basic (in USD per share) $ 11.15 $ 7.57 $ 2.53
Diluted (in USD per share) $ 10.92 $ 7.37 $ 2.51
Antidilutive stock options, RSUs and PSUs      
Earnings per share:      
Antidilutive stock options, RSUs and PSUs (in shares) 0.1 0.0 0.4