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Income Taxes - Net Operating Losses and Income Tax Concessions (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Income taxes |  |
Net operating loss carryforward, Total | $ 69.1 | $ 56.7
2024-2043 |  |
Income taxes |  |
Net operating Loss carryforward, US | 8.5 |
Indefinite |  |
Income taxes |  |
Net operating Loss carryforward, US | 3.8 |
Net operating Loss carryforward, Foreign | 48.7 |
2024-2043 |  |
Income taxes |  |
Net operating Loss carryforward, Foreign | $ 8.1 |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local 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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