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(Loss) Earnings per Share - Schedule of Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Subsidiary, Sale of Stock [Line Items]        
Net (loss) income - basic $ (16.9) $ 42.3 $ (3.0) $ 74.4
Net (loss) income - diluted $ (16.9) $ 42.3 $ (3.0) $ 74.4
Weighted-average shares outstanding:        
Basic (in shares) 95.6 94.6 95.4 94.4
Effect of dilutive securities:        
Diluted (in shares) 95.6 97.7 95.4 98.0
(Loss) earnings per share, basic (in USD per share) $ (0.18) $ 0.45 $ (0.03) $ 0.79
(Loss) earnings per share, diluted (in USD per share) $ (0.18) $ 0.43 $ (0.03) $ 0.76
Shares excluded from diluted per share amounts because their effect would have been anti-dilutive (in shares) 12.5 4.7 12.2 3.7
2024 Notes        
Effect of dilutive securities:        
2024 Notes (in shares) 0.0 1.0 0.0 1.2
Stock options        
Effect of dilutive securities:        
Effect of dilutive securities (in shares) 0.0 1.8 0.0 1.9
Restricted stock        
Effect of dilutive securities:        
Effect of dilutive securities (in shares) 0.0 0.2 0.0 0.4