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, 2024
Dec. 31, 2023
Jan. 01, 2022
Mar. 31, 2018
Debt Instrument [Line Items]        
Borrowings under senior secured credit facility, carrying value $ 363.4 $ 883.7    
Other 2.7 19.8    
Total 2,261.2 2,562.4    
Less: current portion 283.3 309.5    
Long-term portion 1,977.9 2,252.9    
12.250% Senior Secured Notes Due 2029 [Member]        
Debt Instrument [Line Items]        
Senior secured notes, carrying value 766.9 0.0    
2.625% Convertible Senior Notes Due 2024 [Member]        
Debt Instrument [Line Items]        
Convertible senior notes, carrying value 0.0 196.8    
Total     $ 59.1 $ 410.1
4.250% Convertible Senior Notes Due 2028 [Member]        
Debt Instrument [Line Items]        
Convertible senior notes, carrying value 271.5 270.5    
7.875% Senior Notes Due 2025 [Member]        
Debt Instrument [Line Items]        
Senior notes, carrying value 261.6 597.1    
4.875% Senior Notes Due 2029 [Member]        
Debt Instrument [Line Items]        
Senior notes, carrying value $ 595.1 $ 594.5