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Income Taxes, Valuation allowance and tax carryforwards (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Income taxes |  |
Valuation allowance, related to the foreign net operating loss carryforwards and U.S. state tax credits | $ 40.1 | $ 35.2
Change in the valuation allowance, related to foreign net operating loss and foreign and U.S. state credit carryforwards | 4.9 |
Foreign |  |
Income taxes |  |
Loss carryforwards | 165.0 |
Operating loss carryforwards to expire or be refunded | 126.1 |
Tax credit carryforwards | 3.2 |
Tax credit carryforwards to expire or be refunded | 3.2 |
U.S. Federal |  |
Income taxes |  |
Loss carryforwards | 8.2 |
Operating loss carryforwards to expire or be refunded | 8.2 |
Tax credit carryforwards | 0.4 |
Tax credit carryforwards to expire or be refunded | 0.4 |
U.S. State |  |
Income taxes |  |
Loss carryforwards | 78.6 |
Operating loss carryforwards to expire or be refunded | 78.6 |
Tax credit carryforwards | 15.4 |
Tax credit carryforwards to expire or be refunded | $ 9.6 |

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