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Fair Value Measurements - Other Financial Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Jun. 30, 2025
May 31, 2024
Feb. 28, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Carrying Amount $ 1,332.5 $ 1,539.0    
Estimated Fair Value 1,462.0 1,818.1    
Unamortized debt discount 19.0 22.7    
Debt issuance costs, net $ 14.1 $ 17.4    
0.00% Convertible Senior Notes due 2026        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Convertible debt, stated interest rate       0.00%
0.00% Convertible Senior Notes due 2026 | Convertible senior notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Convertible debt, stated interest rate 0.00% 0.00%    
Carrying Amount $ 0.0 $ 199.0    
Estimated Fair Value 0.0 192.3    
Debt issuance costs, net $ 0.0 $ 0.5    
5.50% Convertible Senior Notes due 2029 | Convertible senior notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Convertible debt, stated interest rate 5.50% 5.50% 5.50%  
Carrying Amount $ 350.0 $ 350.0    
Estimated Fair Value 479.5 635.8    
Debt issuance costs, net 5.4 6.4    
Term Loan due and payable on May 30, 2029 | Convertible senior notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Carrying Amount 982.5 990.0    
Estimated Fair Value $ 982.5 $ 990.0