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Income Taxes - Operating loss carryfowards and tax credits (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Operating Loss Carryforwards [Line Items] |  |
Foreign tax credit carryforward | $ 16.0 | $ 17.0
United Kingdom |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 198.0 |
Foreign tax credit carryforward | 10.0 |
Ireland |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 24.0 |
Australia |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 47.0 |
Hong Kong |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 32.0 |
Gibraltar |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 24.0 |
Cyprus |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 1.0 |
United States |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 78.0 |
Foreign tax credit carryforward | 6.0 |
United States | Tax Years 2024 To 2027 |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforward, annual utilization limit | 2.0 |
United States | Tax Years 2028 To 2038 |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforward, annual utilization limit | 1.0 |
United States | Tax Years After 2038 |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforward, annual utilization limit | $ 0.3 |

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