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DEBT AND CREDIT FACILITIES - Narrative (Details) - USD ($)					9 Months Ended
	May 01, 2025	Apr. 01, 2025	Mar. 05, 2025	Feb. 25, 2025	Sep. 30, 2025	Sep. 30, 2024	May 04, 2015	Mar. 24, 2015
Debt Instrument [Line Items]
Repayment of debt					$ 450,000,000	$ 0
5.950% Senior Notes due 2035 (DaVinci) | Senior Notes | DaVinciRe Holdings Ltd.
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			5.95%		5.95%
Principal amount			$ 300,000,000.0
4.750% Senior Notes due 2025 (DaVinci) | Senior Notes | DaVinciRe Holdings Ltd.
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	4.75%		4.75%		4.75%		4.75%
Principal amount							$ 150,000,000.0
Repayment of debt	$ 150,000,000.0		$ 150,000,000.0
5.800% Senior Notes due 2035 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				5.80%	5.80%
Principal amount				$ 500,000,000.0
Issuance of debt, net of expenses				$ 493,500,000
3.700% Senior Notes due 2025 | Senior Notes | RenaissanceRe Finance, Inc.
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage		3.70%			3.70%			3.70%
Principal amount								$ 300,000,000.0
Repayment of debt		$ 300,000,000.0

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