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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Cash interest expense:        
Contractual coupon interest $ 1.9 $ 1.8 $ 5.8 $ 7.0
Non-cash interest expense:        
Amortization of debt issuance costs 1.8 2.0 5.4 5.5
Total interest expense recognized on senior notes $ 3.7 $ 3.8 $ 11.2 $ 12.5
Senior Convertible Notes due 2023        
Non-cash interest expense:        
Effective interest rate (as percent)   1.10%   1.10%
Senior Convertible Notes due 2025        
Non-cash interest expense:        
Effective interest rate (as percent) 0.50% 0.50% 0.50% 0.50%
Senior Convertible Notes due 2028        
Non-cash interest expense:        
Effective interest rate (as percent) 0.70% 0.70% 0.70% 0.70%