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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
Mar. 31, 2020
Mar. 31, 2019
Subsidiary Sale Of Stock [Line Items]    
Net income (loss) - basic and diluted $ 37.4 $ (102.1)
Weighted-average common shares outstanding:    
Weighted average common shares outstanding, basic 92.6 91.1
Effect of dilutive securities:    
Diluted 97.0 91.1
Net income per share:    
Basic $ 0.40 $ (1.12)
Diluted $ 0.39 $ (1.12)
2.25% Convertible Senior Notes due 2024    
Effect of dilutive securities:    
2024 Notes 1.5  
Stocks Options    
Effect of dilutive securities:    
Effect of dilutive securities 2.4  
Restricted Stock    
Effect of dilutive securities:    
Effect of dilutive securities 0.5