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Income Taxes - Carryforwards (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Carryforwards |  |
Valuation allowance against deferred tax assets | $ 64.2 | $ 45.7
UK |  |
Carryforwards |  |
Valuation allowance against deferred tax assets | 14.9 |
UK | Capital loss carryforwards |  |
Carryforwards |  |
Tax credit carryforwards | 2.7 |
Germany |  |
Carryforwards |  |
Net operating loss carryforwards | 54.4 |
Valuation allowance against net operating loss carryforwards | 18.0 |
New Zealand |  |
Carryforwards |  |
Net operating loss carryforwards | 4.6 |
Italy |  |
Carryforwards |  |
Net operating loss carryforwards | 0.1 |
Federal and state | U.S. |  |
Carryforwards |  |
Net operating loss carryforwards | 484.5 |
Tax credit carryforwards | 4.9 |
Net operating loss carryforwards utilized | 157.4 |
Valuation allowance against net operating loss carryforwards | 0.8 |
Valuation allowance against tax credit carryforwards | 0.4 |
Foreign | U.S. |  |
Carryforwards |  |
Tax credit carryforwards | 53.2 |
Valuation allowance against tax credit carryforwards | $ 30.2 |

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