Fair Value Measurements - Other Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024	May 31, 2024	Feb. 28, 2021
0% Convertible Senior Notes Due February 15, 2026
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt, stated interest rate				0.00%
0% Convertible Senior Notes Due February 15, 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%
Convertible senior notes	$ 180.5	$ 175.0
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%
Convertible senior notes	$ 463.4	$ 353.0
Level 1 \| 0% Convertible Senior Notes Due February 15, 2026 \| Convertible senior notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior notes	0.0	0.0
Level 1 \| 5.50% Convertible Senior Notes Due 2029 \| Convertible senior notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior notes	0.0	0.0
Level 2 \| 0% Convertible Senior Notes Due February 15, 2026 \| Convertible senior notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior notes	180.5	175.0
Level 2 \| 5.50% Convertible Senior Notes Due 2029 \| Convertible senior notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior notes	463.4	353.0
Level 3 \| 0% Convertible Senior Notes Due February 15, 2026 \| Convertible senior notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior notes	0.0	0.0
Level 3 \| 5.50% Convertible Senior Notes Due 2029 \| Convertible senior notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior notes	$ 0.0	$ 0.0