Percentage of NXT Capital's ordinary shares outstanding held by Stone Point Capital.

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Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund.

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Amount of written premiums ceded to other entities.

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Amount of reduction of provision for policy benefits and costs incurred for policies ceded.

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The carrying amount as of the balance sheet date of the known and estimated amounts owed to insurers under reinsurance treaties or other arrangements.

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Amount, after valuation allowance, recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, policy benefits and policy reserves. Excludes premiums paid under reinsurance contracts.

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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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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Identify the stated interest rate per the agreement, for example, leasing and debt arrangements between related parties.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands		12 Months Ended
	Jun. 29, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Other investments		$ 996,751	$ 947,982
Ceded premiums		2,951,539	2,759,360	$ 2,490,529
Ceded losses and loss expenses		1,754,000	1,782,000	1,914,000
Insurance and reinsurance balances payable		1,522,764	1,324,620
Stone Point Group
Related Party Transaction [Line Items]
Fees paid to related party		2,000	2,000	3,000
Freedom Consumer Credit Fund, LLC Series B
Related Party Transaction [Line Items]
Fees paid to related party		2,000	3,000	2,000
Other investments		39,000
Stone Point Trident Fund VIII
Related Party Transaction [Line Items]
Fees paid to related party		2,000	4,000	1,000
Other investments		82,000
Stone Point Trident VIII Co-Invest
Related Party Transaction [Line Items]
Other investments		26,000
Trident IX L.P. ("Trident IX")
Related Party Transaction [Line Items]
Fees paid to related party		1,000	0	0
Other investments		9,000
Rialto Real Estate Fund IV-Property
Related Party Transaction [Line Items]
Fees paid to related party		2,000	1,000	0
Other investments		17,000
Stone Point Credit Corporation
Related Party Transaction [Line Items]
Fees paid to related party		300	0	0
Other investments		18,000
Stone Point Credit Corporation Bond
Related Party Transaction [Line Items]
Other investments		17,000
Income earned from related party		600
Sound Point Capital Bond
Related Party Transaction [Line Items]
Other investments		6,000
Gordon Brothers
Related Party Transaction [Line Items]
Other investments		24,000
Chairman
Related Party Transaction [Line Items]
Fees paid to related party				400
Significant influence
Related Party Transaction [Line Items]
Other investments		462,000	555,000
Harrington Re
Related Party Transaction [Line Items]
Ceded premiums		324,000	283,000	256,000
Ceded losses and loss expenses		234,000	188,000	$ 187,000
Reinsurance recoverable on unpaid and paid losses		819,000	717,000
Insurance and reinsurance balances payable		220,000	$ 189,000
Senior Unsecured Notes Due 2031 \| Investment In Related Party
Related Party Transaction [Line Items]
Other investments	$ 10,000
Related party transaction floating rate (as a percent)	7.25%
Rialto Real Estate IV-Property
Related Party Transaction [Line Items]
Other investments		$ 40,000
Stone Point Group \| Pantheon
Related Party Transaction [Line Items]
Percentage ownership by related parties		14.50%