Annual report pursuant to Section 13 and 15(d)

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

v3.20.4
Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Mar. 31, 2018
Debt Instrument [Line Items]      
Borrowings under senior secured credit facility, carrying value $ 976,500,000 $ 965,300,000  
Other 2,500,000 5,000,000.0  
Total 2,428,400,000 1,803,000,000.0  
Less: current portion 22,900,000 24,100,000  
Long-term portion 2,405,500,000 1,778,900,000  
2.625% Convertible Senior Notes Due 2024 [Member]      
Debt Instrument [Line Items]      
Convertible senior notes, carrying value of liability component 460,600,000 437,400,000  
Total     $ 410,100,000
7.875% Senior Notes Due 2025 [Member]      
Debt Instrument [Line Items]      
Senior notes, carrying value 592,900,000    
Total 592,900,000    
7.250% Senior Notes Due 2026 [Member]      
Debt Instrument [Line Items]      
Senior notes, carrying value $ 395,900,000 $ 395,300,000