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Statutory Requirements (Statutory Capital and Surplus) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Bermuda
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	$ 6,692,333	$ 6,328,887
Required statutory capital and surplus	1,307,919	1,336,597
Unrestricted net assets	1,720,899	1,246,201
Switzerland
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	819,481	542,584
Required statutory capital and surplus	587,300	465,900
Unrestricted net assets	237,822	65,292
U.K.
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	874,170	675,864
Required statutory capital and surplus	874,170	675,864
Unrestricted net assets	0	0
U.S.
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	715,171	677,729
Required statutory capital and surplus	476,340	394,204
Unrestricted net assets	$ 71,517	$ 46,630

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

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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

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-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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Amount of statutory capital required to be maintained as of the balance sheet date under prescribed or permitted statutory accounting practices.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (b)
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