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Income Taxes, Valuation allowance and tax carryforwards (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Income taxes |  |
Valuation allowance, related to the foreign net operating loss carryforwards and U.S. state tax credits | $ 73.6 | $ 46.6
Change in the valuation allowance, related to foreign net operating loss and foreign and U.S. state credit carryforwards | 27.0 | $ 4.4
Foreign |  |
Income taxes |  |
Loss carryforwards | 246.8 |
Operating loss carryforwards to expire or be refunded | 40.2 |
U.S. Federal |  |
Income taxes |  |
Loss carryforwards | 35.7 |
Operating loss carryforwards to expire or be refunded | 1.6 |
Tax credit carryforwards | 16.4 |
Tax credit carryforwards to expire or be refunded | 16.4 |
U.S. State |  |
Income taxes |  |
Loss carryforwards | 151.9 |
Operating loss carryforwards to expire or be refunded | 151.9 |
Tax credit carryforwards | 19.5 |
Tax credit carryforwards to expire or be refunded | $ 12.1 |

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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://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-3 + Details
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