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Income Taxes, Valuation allowance and tax carryforwards (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Income taxes |  |
Valuation allowance, related to the foreign net operating loss carryforwards and U.S. state tax credits | $ 44.9 | $ 40.1
Change in the valuation allowance, related to foreign net operating loss and foreign and U.S. state credit carryforwards | 4.8 | $ 4.9
Foreign |  |
Income taxes |  |
Loss carryforwards | 156.7 |
Operating loss carryforwards to expire or be refunded | 114.3 |
Tax credit carryforwards | 0.6 |
Tax credit carryforwards to expire or be refunded | 0.4 |
U.S. Federal |  |
Income taxes |  |
Loss carryforwards | 13.8 |
Operating loss carryforwards to expire or be refunded | 13.8 |
Tax credit carryforwards | 0.9 |
Tax credit carryforwards to expire or be refunded | 0.9 |
U.S. State |  |
Income taxes |  |
Loss carryforwards | 84.1 |
Operating loss carryforwards to expire or be refunded | 84.1 |
Tax credit carryforwards | 17.0 |
Tax credit carryforwards to expire or be refunded | $ 11.0 |

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319 + Details
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