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Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Tax at federal statutory rate	$ (4.2)	$ (7.9)	$ 0.4
Permanent items	0.3	0.0	0.5
Foreign rate differential	0.9	(0.2)	0.2
Stock-based compensation	1.0	(2.0)	(3.1)
Tax credits	(6.1)	(5.6)	(4.9)
Change in valuation allowance	(3.7)	15.1	1.1
Tax contingency and interest	1.3	1.9	1.1
State taxes	(0.7)	(0.4)	0.1
Non-deductible contingent consideration	1.4	4.1	0.0
Other	0.0	(0.2)	0.2
Provision for (benefit from) income taxes	$ (9.8)	$ 4.8	$ (4.4)

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Effective Income Tax Rate Reconciliation, Nondeductible Expense, Contingent Consideration, Amount

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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