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Income Taxes, Valuation allowance and tax carryforwards (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Income taxes |  |
Valuation allowance, related to the foreign net operating loss carryforwards and U.S. state tax credits | $ 35.2 | $ 34.7
Foreign |  |
Income taxes |  |
Loss carryforwards | 146.4 |
Operating loss carryforwards to expire or be refunded | 95.8 |
Tax credit carryforwards | 3.8 |
Tax credit carryforwards to expire or be refunded | 3.8 |
U.S. Federal |  |
Income taxes |  |
Loss carryforwards | 0.7 |
Operating loss carryforwards to expire or be refunded | 0.7 |
U.S. State |  |
Income taxes |  |
Loss carryforwards | 56.0 |
Operating loss carryforwards to expire or be refunded | 56.0 |
Tax credit carryforwards | 13.7 |
Tax credit carryforwards to expire or be refunded | $ 7.9 |

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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=84230637&loc=d3e32559-109319 + Details
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