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STATUTORY REQUIREMENTS - Statutory Net Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Bermuda
Statutory Accounting Practices [Line Items]
Statutory Net Income (Loss)	$ 2,056,265	$ 2,699,083	$ (706,676)
Switzerland
Statutory Accounting Practices [Line Items]
Statutory Net Income (Loss)	312,000	225,751	(244,035)
U.K.
Statutory Accounting Practices [Line Items]
Statutory Net Income (Loss)	89,169	158,258	(24,573)
U.S.
Statutory Accounting Practices [Line Items]
Statutory Net Income (Loss)	$ (87,897)	$ (17,618)	$ 35,344

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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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

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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://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

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