Quarterly report pursuant to Section 13 or 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
Sep. 30, 2021
Dec. 31, 2020
Mar. 31, 2018
Debt Instrument [Line Items]      
Borrowings under senior secured credit facility, carrying value $ 1,093.6 $ 976.5  
Other 3.3 2.5  
Total 2,762.7 2,428.4  
Less: current portion 29.6 22.9  
Long-term portion 2,733.1 2,405.5  
2.625% Convertible Senior Notes Due 2024 [Member]      
Debt Instrument [Line Items]      
Convertible senior notes, carrying value of liability component 479.4 460.6  
Total     $ 410.1
7.875% Senior Notes Due 2025 [Member]      
Debt Instrument [Line Items]      
Senior notes, carrying value 593.8 592.9  
7.250% Senior Notes Due 2026 [Member]      
Debt Instrument [Line Items]      
Senior notes, carrying value   $ 395.9  
4.875% Senior Notes Due 2029 [Member]      
Debt Instrument [Line Items]      
Senior notes, carrying value $ 592.6