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Convertible Senior Notes - Interest Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Debt Disclosure [Abstract] |  |  |
Coupon interest | $ 5.9 | $ 8.5 | $ 11.4
Amortization of debt discount and issuance costs | 1.2 | 17.3 | 21.4
Interest Expense, Total | $ 7.1 | $ 25.8 | $ 32.8

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