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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

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