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ACQUISITION OF VALIDUS - Schedule of Identifiable Intangible Assets (Details) - Validus - USD ($) $ in Thousands		2 Months Ended
	Nov. 01, 2023	Dec. 31, 2023
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward]
Accumulated amortization (from November 1, 2023 through December 31, 2023), net of foreign exchange		$ 7,818
Net identifiable intangible assets related to the acquisition of Validus at December 31, 2023	$ 460,884	$ 453,066
Insurance licenses
Business Acquisition [Line Items]
Intangible assets acquired	13,884
Agent relationships - top four
Business Acquisition [Line Items]
Prepaid reinsurance premiums	$ 195,000
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward]
Economic Useful Life	15 years
Agent relationships - other
Business Acquisition [Line Items]
Prepaid reinsurance premiums	$ 9,000
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward]
Economic Useful Life	5 years
Managing General Agent (“MGA”) relationships
Business Acquisition [Line Items]
Prepaid reinsurance premiums	$ 3,000
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward]
Economic Useful Life	15 years
Trade name
Business Acquisition [Line Items]
Prepaid reinsurance premiums	$ 5,000
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward]
Economic Useful Life	6 months
Renewal rights
Business Acquisition [Line Items]
Prepaid reinsurance premiums	$ 215,000
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward]
Economic Useful Life	15 years
Asset management contracts
Business Acquisition [Line Items]
Prepaid reinsurance premiums	$ 20,000
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward]
Economic Useful Life	4 years

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Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date.

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