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DEBT AND CREDIT FACILITIES - Credit Facilities Narrative (Details)	Dec. 31, 2024 USD ($)	Oct. 03, 2024 USD ($)	Nov. 01, 2023 USD ($)	Oct. 31, 2023 USD ($)	Nov. 18, 2022 USD ($)	Sep. 08, 2022 USD ($)	Dec. 16, 2021 USD ($)	Jun. 21, 2019 USD ($)
Line of Credit Facility [Line Items]
Credit facilities outstanding	$ 619,611,000
Top Layer Reinsurance Ltd. | Letter of Credit
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	37,500,000
Top Layer Reinsurance Ltd. | Letter of Credit | Capital Support Agreement
Line of Credit Facility [Line Items]
Mandatory capital contribution in the event of capital and surplus reduction below a specified level	50,000,000.0
Revolving Credit Facility
Line of Credit Facility [Line Items]
Credit facilities outstanding	0
Revolving Credit Facility | Medici
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	75,000,000.0
Credit facilities outstanding	$ 0
Revolving Credit Facility
Line of Credit Facility [Line Items]
Letter of credit aggregate commitment					$ 500,000,000.0
Line of credit facility, maximum borrowing capacity					700,000,000.0
Debt to capital ratio	0.35
Minimum net worth requirements	$ 4,000,000,000.0
Revolving Credit Facility | Bridge Loan
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity					$ 50,000,000.0
Secured Bilateral Facility | Letter of Credit | Wells Fargo
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity								$ 200,000,000.0
Credit facilities outstanding	20,100,000
Secured Bilateral Facility | Letter of Credit | Citibank Europe plc
Line of Credit Facility [Line Items]
Credit facilities outstanding	232,600,000
Secured Bilateral Facility | Letter of Credit | Citibank Europe plc | Bilateral Facility Participants
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity			$ 320,000,000.0	$ 180,000,000
Accordion feature, maximum borrowing capacity			$ 350,000,000
Loan agreement, remaining borrowing capacity	87,400,000
Unsecured Bilateral Facility | Letter of Credit | Wells Fargo
Line of Credit Facility [Line Items]
Credit facilities outstanding	0
Unsecured Bilateral Facility | Letter of Credit | Citibank Europe plc
Line of Credit Facility [Line Items]
Credit facilities outstanding	293,000,000.0
Unsecured Bilateral Facility | Letter of Credit | Credit Suisse (Switzerland) Ltd.
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity							$ 200,000,000.0
Credit facilities outstanding	19,100,000
Standby Letter of Credit Agreement | Letter of Credit | Nordea Bank Abp, New York Branch
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 250,000,000.0
Credit facilities outstanding	45,300,000
Uncommitted Letter of Credit Facility | Letter of Credit | Société Générale, New York Branch (“SocGen”)
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity						$ 250,000,000.0
Credit facilities outstanding
Percentage of maximum aggregate amount to be secured						40.00%
Secured Letter of Credit Facility | Letter of Credit | Citibank Europe
Line of Credit Facility [Line Items]
Credit facilities outstanding	$ 9,400,000

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Line Of Credit Facility, Accordion Feature, Maximum Borrowing Capacity

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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