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INVESTMENTS - Restricted Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Restricted Investments [Line Items]
Collateral in trust for inter-company agreements	$ 614,089	$ 790,449
Collateral for secured letter of credit facility	423,522	424,624
Funds at Lloyd's	893,177	748,573
Collateral in trust for third-party agreements	2,597,633	2,491,317
Securities on deposit or in trust with regulatory authorities	772,472	731,660
Total restricted investments and cash	5,300,893	5,186,623
Syndicate 1686 | Fixed maturities
Restricted Investments [Line Items]
Collateral in trust for third-party agreements	550,000	539,000
Syndicate 1686 | Cash
Restricted Investments [Line Items]
Collateral in trust for third-party agreements	$ 296,000	$ 217,000
Axis Corporate Capital UK Limited
Restricted Investments [Line Items]
Capital support, percentage	70.00%
Axis Corporate Capital UK Limited II
Restricted Investments [Line Items]
Capital support, percentage	30.00%

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- Definition

The amount of capital support provided to Lloyd's Syndicate 1686.

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The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for inter-company insurance and reinsurance agreements, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

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- Definition

Pledged Financial Instruments, Not Separately Reported, Securities For Letter Of Credit Facility

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The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for insurance and reinsurance agreements with third parties, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

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- Definition

Pledged Financial Instruments, Underwriting Support

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- Definition

Restricted Investments [Line Items]

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- Definition

Carrying amount of cash and investment securities on deposit with state regulatory authorities in connection with capital requirements.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 825
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479383/944-825-50-1A

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- Definition

Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481420/860-30-50-1A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 954
-SubTopic 210
-Name Accounting Standards Codification
-Section 45
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480632/954-210-45-4

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 954
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480602/954-210-50-2

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