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Statutory Requirements (Statutory Net Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Bermuda
Statutory Accounting Practices [Line Items]
Statutory Net Income (Loss)	$ 836,707	$ 705,808	$ 326,386
Switzerland
Statutory Accounting Practices [Line Items]
Statutory Net Income (Loss)	76,473	(52,699)	0
U.K.
Statutory Accounting Practices [Line Items]
Statutory Net Income (Loss)	(37,427)	(666,595)	(6,692)
U.S.
Statutory Accounting Practices [Line Items]
Statutory Net Income (Loss)	$ 16,991	$ 37,827	$ 25,851

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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 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

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