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Convertible Senior Notes - Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Debt Disclosure [Abstract]
Coupon interest	$ 1.8	$ 1.9	$ 4.0	$ 4.1
Amortization of debt discount and issuance costs	0.4	4.3	0.8	8.5
Total interest expense	$ 2.2	$ 6.2	$ 4.8	$ 12.6

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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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