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Convertible Senior Notes - Interest Expense (Details) - USD ($) $ in Millions	12 Months Ended
	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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Debt Instrument, Coupon Interest

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Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

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Amount of the cost of borrowed funds accounted for as interest expense.

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