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Debt - Schedule of Debt (Details) - USD ($)
Sep. 30, 2024
Apr. 14, 2024
Dec. 31, 2023
Dec. 31, 2022
Oct. 15, 2021
Nov. 17, 2020
Debt Instrument            
Principal balance $ 1,061,400,000   $ 1,130,600,000      
Unamortized original issue discount (64,200,000)   (78,800,000)      
Unamortized deferred financing costs (5,100,000)   (7,200,000)      
Long-term debt 504,369,000   564,836,000      
Aggregate principal amount of debt 992,100,000   1,044,600,000      
Long term debt, gross, current (60,500,000)   (63,800,000)      
Debt instrument unamortized discount current 0   0      
Debt issuance costs, current, net 0   0      
Long-term debt, current maturities (60,500,000)   (63,800,000)      
Long term debt, gross, noncurrent 1,000,900,000   1,066,800,000      
Debt instrument, unamortized discount, noncurrent (64,200,000)   (78,800,000)      
Debt issuance costs, noncurrent, net (5,100,000)   (7,200,000)      
Non-current portion of long-term debt 931,600,000   980,800,000      
Senior Secured Term Loan | Senior Secured Term Loan            
Debt Instrument            
Principal balance 297,600,000   350,400,000   $ 516,000,000.0  
Unamortized original issue discount (3,300,000)   (5,200,000)      
Unamortized deferred financing costs (700,000)   (1,100,000)      
Secured debt 293,600,000   344,100,000      
Senior Secured Term Loan | 2026 Senior Notes            
Debt Instrument            
Principal balance       $ 30,000,000.0    
Senior Notes | 2026 Senior Notes            
Debt Instrument            
Principal balance 278,500,000   291,600,000   $ 400,000,000  
Unamortized original issue discount (4,100,000)   (5,800,000)      
Unamortized deferred financing costs (3,200,000)   (4,600,000)      
Long-term debt 271,200,000   281,200,000      
Convertible Debt | 2027 Notes            
Debt Instrument            
Principal balance 485,300,000   485,300,000     $ 497,100,000
Unamortized original issue discount (56,800,000)   (67,800,000)      
Unamortized deferred financing costs (1,200,000)   (1,500,000)      
Long-term debt 427,300,000   416,000,000.0      
Convertible Debt | 2024 Notes            
Debt Instrument            
Principal balance 0 $ 3,300,000 3,300,000      
Unamortized original issue discount 0   0      
Unamortized deferred financing costs 0   0      
Long-term debt $ 0   $ 3,300,000