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Convertible Senior Notes - Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Debt Disclosure [Abstract]
Coupon interest	$ 1.1	$ 1.8	$ 2.0	$ 4.0
Amortization of debt discount and issuance costs	0.2	0.4	0.4	0.8
Total interest expense	$ 1.3	$ 2.2	$ 2.4	$ 4.8

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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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