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Income Taxes - Schedule of Tax Credits and Operating Loss Carryforwards (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss	$ 28.7	$ 38.0
Federal | R&D credits
Operating Loss Carryforwards [Line Items]
Tax credits	0.0	80.1
Federal | Foreign tax credits
Operating Loss Carryforwards [Line Items]
Tax credits	0.0	1.5
State | California
Operating Loss Carryforwards [Line Items]
Net operating loss	185.0	236.3
State | California | R&D credits
Operating Loss Carryforwards [Line Items]
Tax credits	96.4	81.4
State | Other states
Operating Loss Carryforwards [Line Items]
Net operating loss	8.5	21.3
Foreign | UK
Operating Loss Carryforwards [Line Items]
Net operating loss	90.5	102.4
Foreign | Other foreign
Operating Loss Carryforwards [Line Items]
Net operating loss	$ 9.7	$ 0.0

X

- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
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