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Income Taxes - Operating loss carry forwards (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Net operating loss carry forwards |  |  |
Net operating loss carry forward | $ 6.7 | $ 6.6 |
Valuation allowance | 23.8 | 20.3 |
Restructuring of manufacturing supply chain operations |  | (16.1) | $ 29.3
Valuation allowance on foreign tax credits |  |  | 22.1
Income tax expense (benefit) supply chain restructuring |  |  | $ 7.2
Restructuring of manufacturing supply chain operations, Deferred tax asset recognized | $ 16.1 |  |
Amortization period | 10 years |  |
Foreign |  |  |
Net operating loss carry forwards |  |  |
Net operating loss carryforward, not subject to expiration | $ 23.9 |  |
Net operating loss carryforward, subject to expiration | 9.1 |  |
Operating loss carryforward | 33.0 |  |
Tax credit carryforward | 17.4 | 13.6 |
Austrian Operations |  |  |
Net operating loss carry forwards |  |  |
Operating loss carryforward | 23.9 |  |
United States Operations |  |  |
Net operating loss carry forwards |  |  |
Operating loss carryforward | 1.0 |  |
Switzerland operations |  |  |
Net operating loss carry forwards |  |  |
Operating loss carryforward | 9.1 |  |
U.S. |  |  |
Net operating loss carry forwards |  |  |
Capital loss carry forward | 1.6 |  |
Domestic |  |  |
Net operating loss carry forwards |  |  |
Net operating loss carryforward, not subject to expiration | 0.4 |  |
Net operating loss carryforward, subject to expiration | 0.6 |  |
Operating loss carryforward | 1.0 |  |
Capital loss carry forward | $ 1.6 | $ 1.7 |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-6 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-8 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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