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Debt - Components of Interest Expense and Effective Interest Rates of Senior Convertible Notes (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Cash interest expense:        
Contractual coupon interest $ 1.9 $ 1.9 $ 5.8 $ 5.8
Non-cash interest expense:        
Amortization of debt issuance costs 1.8 1.8 5.4 5.4
Total interest expense recognized on senior notes $ 3.7 $ 3.7 $ 11.2 $ 11.2
Senior Convertible Notes due 2025        
Non-cash interest expense:        
Effective interest rate 0.50% 0.50% 0.50% 0.50%
Senior Convertible Notes due 2028        
Non-cash interest expense:        
Effective interest rate 0.70% 0.70% 0.70% 0.70%