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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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