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Net Income (Loss) Per Share - Schedule of Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Subsidiary, Sale of Stock [Line Items]        
Net income (loss) - basic and diluted $ 22.5 $ (57.6) $ 96.9 $ 59.4
Weighted-average common shares outstanding:        
Basic (in shares) 94.7 93.3 94.5 93.0
Effect of dilutive securities:        
Diluted (in shares) 97.7 93.3 97.9 98.0
Net income (loss) per share:        
Basic (in USD per share) $ 0.24 $ (0.62) $ 1.03 $ 0.64
Diluted (in USD per share) $ 0.23 $ (0.62) $ 0.99 $ 0.61
Shares excluded from diluted per share amounts because their effect would have been anti-dilutive (in shares) 4.5 10.9 4.0 2.3
2.25% Convertible Senior Notes due 2024        
Effect of dilutive securities:        
2024 Notes (in shares) 1.0 0.0 1.1 2.0
Stock options        
Effect of dilutive securities:        
Effect of dilutive securities (in shares) 1.8 0.0 1.9 2.5
Restricted stock        
Effect of dilutive securities:        
Effect of dilutive securities (in shares) 0.2 0.0 0.3 0.5