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Convertible Senior Notes - Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Debt Disclosure [Abstract]
Coupon interest	$ 1.0	$ 2.2	$ 5.0	$ 6.3
Amortization of debt discount and issuance costs	0.2	4.4	1.0	12.9
Total interest expense	$ 1.2	$ 6.6	$ 6.0	$ 19.2

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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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