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Net Income Per Share - Schedule of Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Subsidiary, Sale of Stock [Line Items]        
Net income - basic and diluted $ 42.3 $ 79.6 $ 74.4 $ 117.0
Weighted-average common shares outstanding:        
Basic (in shares) 94.6 93.0 94.4 92.8
Effect of dilutive securities:        
Diluted (in shares) 97.7 98.2 98.0 97.6
Net income per share:        
Basic (in USD per share) $ 0.45 $ 0.86 $ 0.79 $ 1.26
Diluted (in USD per share) $ 0.43 $ 0.81 $ 0.76 $ 1.20
Shares excluded from diluted per share amounts because their effect would have been anti-dilutive (in shares) 4.7 2.2 3.7 1.4
2.25% Convertible Senior Notes due 2024        
Effect of dilutive securities:        
2024 Notes (in shares) 1.0 2.1 1.2 1.8
Stock options        
Effect of dilutive securities:        
Effect of dilutive securities (in shares) 1.8 2.6 1.9 2.5
Restricted stock        
Effect of dilutive securities:        
Effect of dilutive securities (in shares) 0.2 0.5 0.4 0.5