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Statutory Requirements (Statutory Capital and Surplus) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Bermuda |  |
Statutory Accounting Practices [Line Items] |  |
Statutory capital and surplus | $ 7,462,710 | $ 6,698,377
Required statutory capital and surplus | 1,753,078 | 1,391,621
Unrestricted net assets | 1,575,526 | 1,705,739
Switzerland |  |
Statutory Accounting Practices [Line Items] |  |
Statutory capital and surplus | 874,665 | 814,837
Required statutory capital and surplus | 780,000 | 587,300
Unrestricted net assets | 300,438 | 232,917
U.K. |  |
Statutory Accounting Practices [Line Items] |  |
Statutory capital and surplus | 983,449 | 874,170
Required statutory capital and surplus | 983,449 | 874,170
Unrestricted net assets | 0 | 0
U.S. |  |
Statutory Accounting Practices [Line Items] |  |
Statutory capital and surplus | 819,811 | 722,721
Required statutory capital and surplus | 716,118 | 474,622
Unrestricted net assets | $ 81,981 | $ 72,272

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- Definition Amount of dividends that can be declared or paid without approval of regulatory agency. + References No definition available. + Details
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- Definition The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country. + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529 + Details
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- Definition Amount of statutory capital required to be maintained as of the balance sheet date under prescribed or permitted statutory accounting practices. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529 + Details
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