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Statutory Requirements - Statutory Net Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Bermuda |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Net Income (Loss) | $ 2,904,049 | $ (700,666) | $ (89,267)
Switzerland |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Net Income (Loss) | 233,904 | (237,003) | 80,500
U.K. |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Net Income (Loss) | 158,258 | (24,573) | (46,352)
U.S. |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Net Income (Loss) | $ (17,268) | $ 35,344 | $ 10,465

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
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- Definition Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
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