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Income Taxes - Carryforwards (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating Loss Carryforwards |  |  |
Foreign pre-tax loss | $ 0.0 | $ 0.0 |
Federal |  |  |
Operating Loss Carryforwards |  |  |
Net operating loss carryforwards | 611.0 | 611.0 | $ 611.0
Net operating loss carryforwards with no expiration date |  | 214.8 |
Federal | R&D credit |  |  |
Operating Loss Carryforwards |  |  |
Tax credit carryforwards | 35.1 |  |
State |  |  |
Operating Loss Carryforwards |  |  |
Net operating loss carryforwards | 704.8 |  |
State | R&D credit |  |  |
Operating Loss Carryforwards |  |  |
Tax credit carryforwards | $ 12.4 |  |
Australian Subsidiary |  |  |
Operating Loss Carryforwards |  |  |
Foreign Net Operating Loss written off |  | $ 14.9 |

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