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Income Taxes - Carryforwards (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Carryforwards |  |
Valuation allowance against deferred tax assets | $ 40.5 | $ 36.6
UK |  |
Carryforwards |  |
Valuation allowance against deferred tax assets | 8.3 |
UK | Capital loss carryforwards |  |
Carryforwards |  |
Tax credit carryforwards | 3.4 |
Germany |  |
Carryforwards |  |
Net operating loss carryforwards | 30.6 |
Valuation allowance against net operating loss carryforwards | 13.0 |
Australia |  |
Carryforwards |  |
Net operating loss carryforwards | 10.0 |
New Zealand |  |
Carryforwards |  |
Net operating loss carryforwards | 1.7 |
Italy |  |
Carryforwards |  |
Net operating loss carryforwards | 0.1 |
State | U.S. |  |
Carryforwards |  |
Net operating loss carryforwards | 558.7 |
Net operating loss carryforwards utilized | 86.3 |
Valuation allowance against net operating loss carryforwards | 0.9 |
Federal and state | U.S. |  |
Carryforwards |  |
Tax credit carryforwards | 5.4 |
Valuation allowance against tax credit carryforwards | 0.4 |
Foreign | U.S. |  |
Carryforwards |  |
Tax credit carryforwards | 31.5 |
Valuation allowance against tax credit carryforwards | $ 17.9 |

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