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Subsequent events (Details)
3 Months Ended 9 Months Ended
Oct. 15, 2024
USD ($)
Dec. 31, 2024
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Oct. 15, 2021
USD ($)
Nov. 17, 2020
USD ($)
Subsequent Event                      
Principal balance     $ 1,061,400,000   $ 1,061,400,000   $ 1,130,600,000        
Aggregate principal amount of debt     992,100,000   992,100,000   1,044,600,000        
Gain on early extinguishment of debt     (176,000) $ 2,717,000 354,000 $ 3,213,000          
Subsequent Event                      
Subsequent Event                      
Debt outstanding $ 1,100,000,000                    
2029 Term Loan Facility | Senior Secured Term Loan | Subsequent Event                      
Subsequent Event                      
Principal balance 900,000,000.0                    
Debt outstanding $ 850,400,000                    
2029 Term Loan Facility | Senior Secured Term Loan | Subsequent Event | Base Rate                      
Subsequent Event                      
Variable rate (as a percent) 4.00%                    
2029 Term Loan Facility | Senior Secured Term Loan | Subsequent Event | Base Rate | Minimum                      
Subsequent Event                      
Stated interest rate (as a percent) 2.50%                    
2029 Term Loan Facility | Senior Secured Term Loan | Subsequent Event | Adjusted Term SOFR                      
Subsequent Event                      
Variable rate (as a percent) 5.00%                    
2029 Term Loan Facility | Senior Secured Term Loan | Subsequent Event | Adjusted Term SOFR | Minimum                      
Subsequent Event                      
Stated interest rate (as a percent) 1.50%                    
2029 Initial Draw Facility | Senior Secured Term Loan | Subsequent Event                      
Subsequent Event                      
Principal balance $ 850,400,000                    
2029 Delayed Draw Facility | Line of Credit | Subsequent Event                      
Subsequent Event                      
Principal balance $ 49,600,000                    
Debt instrument term (in years) 6 months                    
Line of credit facility available for borrowing $ 49,600,000                    
2026 Senior Notes | Subsequent Event                      
Subsequent Event                      
Upfront fee (as a percent) 1.50%                    
2026 Senior Notes | Senior Secured Term Loan                      
Subsequent Event                      
Principal balance               $ 30,000,000.0      
2026 Senior Notes | Senior Notes                      
Subsequent Event                      
Principal balance     278,500,000   278,500,000   291,600,000     $ 400,000,000  
Stated interest rate (as a percent)                   6.00%  
Gain on early extinguishment of debt       $ 3,300,000 600,000 $ 4,200,000          
2026 Senior Notes | Senior Notes | Subsequent Event                      
Subsequent Event                      
Principal balance $ 274,700,000                    
Aggregate cash consideration 234,900,000                    
Aggregate principal amount of debt 3,900,000                    
Debt outstanding 3,900,000                    
Loan Option Consideration | Senior Notes | Subsequent Event                      
Subsequent Event                      
Principal balance 40,400,000                    
Cash Option Consideration | Senior Notes | Subsequent Event                      
Subsequent Event                      
Principal balance 234,300,000                    
2027 Notes | Senior Notes | Subsequent Event                      
Subsequent Event                      
Principal balance 223,600,000                    
Aggregate principal amount of debt 38,100,000                    
Repurchased face amount 223,600,000                    
Repurchase amount 248,200,000                    
Debt outstanding $ 38,100,000                    
2027 Notes | Convertible Debt                      
Subsequent Event                      
Principal balance     $ 485,300,000   $ 485,300,000   $ 485,300,000       $ 497,100,000
Stated interest rate (as a percent)                     6.00%
Repurchased face amount                 $ 11,800,000    
2027 Notes | Convertible Debt | Subsequent Event                      
Subsequent Event                      
Excess of repurchase amount per dollar of debt 1.11                    
Senior Secured Convertible Notes Due 2031 | Subsequent Event                      
Subsequent Event                      
Principal balance $ 110,000                    
Senior Secured Convertible Notes Due 2031 | Senior Notes | Subsequent Event                      
Subsequent Event                      
Aggregate principal amount of debt $ 223,700,000                    
Senior Secured Convertible Notes Due 2031 | Convertible Debt | Subsequent Event                      
Subsequent Event                      
Stated interest rate (as a percent) 6.00%                    
Debt outstanding $ 223,700,000                    
Senior Secured Term Loan, 2026 Senior Notes and 2027 Senior Notes | Forecast                      
Subsequent Event                      
Gain on early extinguishment of debt   $ 50,000,000                  
Other fees   $ 10,000,000