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Earnings Per Share - Schedule of Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Subsidiary, Sale of Stock [Line Items]      
Net income (loss) $ 89.6 $ 407.3 $ 37.0
Weighted-average common shares outstanding:      
Basic (in shares) 94.6 93.1 91.6
Effect of dilutive securities:      
Diluted (in shares) 97.9 97.8 95.7
Earnings per share:      
Basic (in USD per share) $ 0.95 $ 4.38 $ 0.40
Diluted (in USD per share) $ 0.92 $ 4.16 $ 0.39
2.25% Convertible Senior Notes      
Effect of dilutive securities:      
2024 Notes (in shares) 1.1 1.8 1.1
Stock options      
Effect of dilutive securities:      
Effect of dilutive securities (in shares) 1.8 2.4 2.6
Restricted stock units      
Effect of dilutive securities:      
Effect of dilutive securities (in shares) 0.3 0.5 0.4