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Income Taxes - Significant Loss and Tax Credit Carryforwards and Years of Expiration (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Federal
Operating Loss Carryforwards [Line Items]
Net Operating Loss	$ 169.1	$ 438.8
Tax Credits	73.1	54.4
State | California
Operating Loss Carryforwards [Line Items]
Net Operating Loss	236.3	235.3
Tax Credits	66.2	52.7
State | Other States
Operating Loss Carryforwards [Line Items]
Net Operating Loss	36.1	88.8
Foreign | UK
Operating Loss Carryforwards [Line Items]
Net Operating Loss	$ 113.2	$ 124.1

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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