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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