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Income Taxes - Significant Loss and Tax Credit Carryforwards and Years of Expiration (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss	$ 38.0	$ 169.1
Federal | R&D credits
Operating Loss Carryforwards [Line Items]
Tax credits	80.1	73.1
Federal | Foreign tax credits
Operating Loss Carryforwards [Line Items]
Tax credits	1.5	0.0
State | California
Operating Loss Carryforwards [Line Items]
Net operating loss	236.3	236.3
State | California | R&D credits
Operating Loss Carryforwards [Line Items]
Tax credits	81.4	66.2
State | Other states
Operating Loss Carryforwards [Line Items]
Net operating loss	21.3	36.1
Foreign | UK
Operating Loss Carryforwards [Line Items]
Net operating loss	$ 102.4	$ 113.2

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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