Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Mar. 31, 2018
Debt Instrument [Line Items]      
Borrowings under senior secured credit facility, carrying value $ 981.2 $ 965.3  
Other 4.5 5.0  
Total 2,428.6 1,803.0  
Less: current portion 24.9 24.1  
Long-term portion 2,403.7 1,778.9  
2.625% Convertible Senior Notes Due 2024 [Member]      
Debt Instrument [Line Items]      
Convertible senior notes, carrying value of liability component 454.6 437.4  
Total     $ 410.1
7.250% Senior Notes Due 2026 [Member]      
Debt Instrument [Line Items]      
Senior notes, carrying value 395.7 $ 395.3  
7.875% Senior Notes Due 2025 [Member]      
Debt Instrument [Line Items]      
Senior notes, carrying value $ 592.6