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STATUTORY REQUIREMENTS - Statutory Capital and Surplus (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Bermuda
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	$ 11,793,261	$ 12,141,907
Required statutory capital and surplus	2,686,108	2,284,208
Switzerland
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	1,908,106	2,644,998
Required statutory capital and surplus	1,049,922	987,707
U.K.
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	952,309	935,776
Required statutory capital and surplus	952,309	935,776
U.S.
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	1,255,304	1,044,010
Required statutory capital and surplus	$ 967,735	$ 794,061

X

- 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

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://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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-Name Accounting Standards Codification
-Topic 944
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477908/944-505-50-1

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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
-Name Accounting Standards Codification
-Topic 944
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477908/944-505-50-1

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