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Financial Instruments and Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025	Jun. 30, 2025	Jun. 23, 2025	Feb. 20, 2025
2029 Convertible Notes \| Convertible Notes Payable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Coupon Interest	3.50%		3.50%				3.50%
2028 Convertible Notes \| Convertible Notes Payable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Coupon Interest	2.25%		2.25%				2.25%
2030 Convertible Notes \| Convertible Notes Payable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Coupon Interest	0.00%		0.00%			0.00%
Level 1 \| Marketable equity security
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized (loss) gain on investments	$ (0.5)	$ (1.3)	$ 8.5	$ (0.2)
Level 3 \| Auction Rate Security
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments credit loss	0.0	$ 0.0	0.0	$ 0.0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of debt outstanding	4,113.7		4,113.7		$ 112.5
Level 2 \| 2029 Convertible Notes \| Convertible Notes Payable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of convertible debt	1,381.7		1,381.7		1,801.9
Level 2 \| 2028 Convertible Notes \| Convertible Notes Payable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of convertible debt	601.9		601.9		818.5
Level 2 \| 2030 Convertible Notes \| Convertible Notes Payable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of convertible debt	$ 1,684.3		$ 1,684.3		$ 2,576.6