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Convertible Senior Notes - Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Debt Disclosure [Abstract]
Coupon interest	$ 0.9	$ 1.0	$ 2.9	$ 5.0
Amortization of debt discount and issuance costs	0.2	0.2	0.6	1.0
Total interest expense	$ 1.1	$ 1.2	$ 3.5	$ 6.0

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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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