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Income Taxes - Carryforwards (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Operating Loss Carryforwards |  |
Foreign pre-tax loss | $ 0.0 | $ 3.0
Federal |  |
Operating Loss Carryforwards |  |
Net operating loss carryforwards | 638.9 |
Net operating loss carryforwards with no expiration date | 146.0 |
Federal | R&D credit |  |
Operating Loss Carryforwards |  |
Tax credit carryforwards | 33.4 |
State |  |
Operating Loss Carryforwards |  |
Net operating loss carryforwards | 595.1 |
State | R&D credit |  |
Operating Loss Carryforwards |  |
Tax credit carryforwards | 11.7 |
Australian Subsidiary |  |
Operating Loss Carryforwards |  |
Foreign Net Operating Loss written off | $ 14.9 |

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