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Debt - Components of Convertible Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Feb. 28, 2026
Jun. 30, 2025
May 31, 2024
Feb. 28, 2021
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net [Abstract]          
Unamortized debt issuance costs $ (13.2)   $ (17.4)    
Unamortized debt discount (17.7)   (22.7)    
Net carrying amount 1,330.0        
5.50% Convertible Senior Notes due 2029 | Convertible senior notes          
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net [Abstract]          
Principal 350.0   350.0 $ 350.0  
Unamortized debt issuance costs (5.1)   (6.4)    
Net carrying amount 344.9   343.6    
0.00% Convertible Senior Notes due 2026 | Convertible senior notes          
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net [Abstract]          
Principal 199.0   199.0   $ 1,000.0
Unamortized debt issuance costs 0.0   (0.5)    
Principal payments (199.0) $ (199.0) 0.0    
Net carrying amount 0.0   198.5    
Convertible Senior Notes Outstanding On November 16, 2025 | Convertible senior notes | Term Loan Facility          
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net [Abstract]          
Principal 1,000.0   1,000.0    
Unamortized debt issuance costs (8.1)   (10.4)    
Principal payments (20.0)   (10.0)    
Unamortized debt discount (17.7)   (22.7)    
Net carrying amount $ 954.2   $ 956.9