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Statutory Requirements (Statutory Net Income (Loss)) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Bermuda |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Net Income (Loss) | $ (89,267) | $ 836,707 | $ 705,808
Switzerland |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Net Income (Loss) | 80,500 | 71,829 | (52,699)
U.K. |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Net Income (Loss) | (46,352) | (37,427) | (667)
U.S. |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Net Income (Loss) | $ 10,465 | $ 17,403 | $ 37,827

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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 No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(c)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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