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Convertible Senior Notes - 2024 Notes (Details) - USD ($)	Jun. 30, 2022	Dec. 31, 2021	May 02, 2017
Debt Instrument [Line Items]
Net Carrying Amount	$ 169,000,000.0	$ 335,100,000
2.25% Convertible senior notes due 2024
Debt Instrument [Line Items]
Principal Amount	170,400,000	381,200,000	$ 517,500,000
Unamortized Debt, Discount	0	(43,200,000)
Unamortized Debt, Issuance Costs	(1,400,000)	(2,900,000)
Net Carrying Amount	169,000,000.0	335,100,000
Fair Value, Amount	$ 224,800,000	$ 464,700,000

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