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DEBT AND CREDIT FACILITIES - Debt Obligations Narrative (Details) - USD ($)							12 Months Ended
	May 01, 2025	Apr. 01, 2025	Mar. 05, 2025	Feb. 25, 2025	Jun. 05, 2023	Apr. 02, 2019	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Nov. 03, 2025	Jun. 29, 2017	May 04, 2015	Mar. 24, 2015
Debt Instrument [Line Items]
Repayments of debt							$ 450,000,000	$ 75,000,000	$ 30,000,000
Issuance of debt, net of expenses							$ 889,114,000	$ 0	$ 740,581,000
7.003% Senior Notes due 2035 (Fontana) \| Senior Notes \| Fontana
Debt Instrument [Line Items]
Interest rate							7.003%			7.003%
Face amount										$ 100,000,000.0
5.950% Senior Notes due 2035 (DaVinci) \| Senior Notes \| DaVinci
Debt Instrument [Line Items]
Interest rate			5.95%				5.95%
Face amount			$ 300,000,000.0
4.750% Senior Notes Due May 1, 2025 \| Senior Notes \| DaVinci
Debt Instrument [Line Items]
Interest rate	4.75%		4.75%				4.75%					4.75%
Repayments of debt	$ 150,000,000.0		$ 150,000,000.0
4.750% Senior Notes Due May 1, 2025 \| Senior Notes \| DaVinci
Debt Instrument [Line Items]
Face amount												$ 150,000,000.0
5.800% Senior Notes due 2035 \| Senior Notes
Debt Instrument [Line Items]
Interest rate				5.80%			5.80%
Face amount				$ 500,000,000.0
Issuance of debt, net of expenses				$ 493,500,000
5.750% Senior Notes due 2033 \| Senior Notes
Debt Instrument [Line Items]
Interest rate					5.75%		5.75%
Face amount					$ 750,000,000.0
Issuance of debt, net of expenses					$ 741,000,000.0
3.600% Senior Notes due 2029 \| Senior Notes
Debt Instrument [Line Items]
Interest rate						3.60%	3.60%
Face amount						$ 400,000,000.0
Repayments of long-term lines of credit						$ 200,000,000.0
3.450% Senior Notes due 2027 \| Senior Notes \| RenaissanceRe Finance, Inc.
Debt Instrument [Line Items]
Interest rate							3.45%				3.45%
Face amount											$ 300,000,000.0
3.700% Senior Notes due 2025 \| Senior Notes \| RenaissanceRe Finance, Inc.
Debt Instrument [Line Items]
Interest rate		3.70%					3.70%						3.70%
Face amount													$ 300,000,000.0
Repayments of debt		$ 300,000,000.0