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COMMITMENTS AND CONTINGENCIES - Reinsurance Purchase Commitment, Investments and Funds at Lloyd's (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Unrecorded Unconditional Purchase Obligation [Line Items]
Unfunded commitments related to other investments	$ 526,000	$ 502,000
Purchase commitment	0	6,000
Collateral in trust for third-party agreements	2,602,306	2,597,633
Corporate debt
Unrecorded Unconditional Purchase Obligation [Line Items]
Purchase commitment	94,000	16,000
CMBS
Unrecorded Unconditional Purchase Obligation [Line Items]
Purchase commitment	9,000	10,000
Lloyd's
Unrecorded Unconditional Purchase Obligation [Line Items]
Collateral in trust for third-party agreements	$ 883,000	$ 893,000

X

- Definition

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.

+ References

No definition available.

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X

- Definition

The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments).

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
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- Definition

Amount of unrecorded obligation to transfer funds in future for fixed or minimum amount or quantity of product and service at fixed or minimum price. Includes, but is not limited to, lease not yet commenced and take-or-pay and throughput contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 440
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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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-Topic 440
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