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Convertible Senior Notes - Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Debt Disclosure [Abstract]
Coupon interest	$ 2.2	$ 2.2
Amortization of debt discount and issuance costs	0.4	4.2
Interest Expense	$ 2.6	$ 6.4

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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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