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Convertible Senior Notes - Interest Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Debt Disclosure [Abstract] |  |  |
Coupon interest | $ 3.9 | $ 5.9 | $ 8.5
Amortization of debt discount and issuance costs | 0.7 | 1.2 | 17.3
Interest Expense, Total | $ 4.6 | $ 7.1 | $ 25.8

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