Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Schedule of Long-Term Debt (Detail)

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Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Feb. 28, 2014
Debt Instrument [Line Items]        
Borrowings under senior secured credit facility, carrying value $ 965.3 $ 983.6    
Other 5.0 3.0    
Total 1,803.0 2,453.8    
Less: current portion 24.1 678.9    
Long-term portion 1,778.9 1,774.9    
2.00% Convertible Senior Notes Due 2019 [Member]        
Debt Instrument [Line Items]        
Convertible senior notes, carrying value of liability component   656.4    
Total       $ 930.9
2.625% Convertible Senior Notes Due 2024 [Member]        
Debt Instrument [Line Items]        
Convertible senior notes, carrying value of liability component 437.4 416.0    
Total     $ 410.1  
7.250% Senior Notes Due 2026 [Member]        
Debt Instrument [Line Items]        
Senior notes, carrying value $ 395.3 $ 394.8