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Statutory Requirements (Statutory Capital and Surplus) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
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

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.

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- Definition

Amount of dividends that can be declared or paid without approval of regulatory agency.

+ References

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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

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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

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