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DEBT AND CREDIT FACILITIES - Schedule of Debt Obligations (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Mar. 05, 2025	Feb. 25, 2025	Dec. 31, 2024	Mar. 24, 2015
Debt Instrument [Line Items]
Long-term debt	$ 2,700,000			$ 1,900,000
Fair Value
Debt Instrument [Line Items]
Long-term debt	2,739,289			1,871,492
Carrying Value
Debt Instrument [Line Items]
Long-term debt	2,753,738			1,886,689
Senior Notes | Fair Value
Debt Instrument [Line Items]
Long-term debt	2,664,289			1,871,492
Senior Notes | Carrying Value
Debt Instrument [Line Items]
Long-term debt	$ 2,678,738			1,886,689
Senior Notes | 5.950% Senior Notes due 2035 (DaVinci) | DaVinci Holdings Ltd.
Debt Instrument [Line Items]
Stated interest rate	5.95%	5.95%
Senior Notes | 5.950% Senior Notes due 2035 (DaVinci) | DaVinci Holdings Ltd. | Fair Value
Debt Instrument [Line Items]
Long-term debt	$ 293,652			0
Senior Notes | 5.950% Senior Notes due 2035 (DaVinci) | DaVinci Holdings Ltd. | Carrying Value
Debt Instrument [Line Items]
Long-term debt	$ 297,593			0
Senior Notes | 5.800% Senior Notes Due 2035 | RenaissanceRe Finance, Inc.
Debt Instrument [Line Items]
Stated interest rate	5.80%		5.80%
Senior Notes | 5.800% Senior Notes Due 2035 | RenaissanceRe Finance, Inc. | Fair Value
Debt Instrument [Line Items]
Long-term debt	$ 497,925			0
Senior Notes | 5.800% Senior Notes Due 2035 | RenaissanceRe Finance, Inc. | Carrying Value
Debt Instrument [Line Items]
Long-term debt	$ 493,704			0
Senior Notes | 5.750% Senior Notes due 2033 | RenaissanceRe Finance, Inc.
Debt Instrument [Line Items]
Stated interest rate	5.75%
Senior Notes | 5.750% Senior Notes due 2033 | RenaissanceRe Finance, Inc. | Fair Value
Debt Instrument [Line Items]
Long-term debt	$ 748,148			755,693
Senior Notes | 5.750% Senior Notes due 2033 | RenaissanceRe Finance, Inc. | Carrying Value
Debt Instrument [Line Items]
Long-term debt	$ 742,300			742,068
Senior Notes | 3.600% Senior Notes due 2029 | RenaissanceRe Finance, Inc.
Debt Instrument [Line Items]
Stated interest rate	3.60%
Senior Notes | 3.600% Senior Notes due 2029 | RenaissanceRe Finance, Inc. | Fair Value
Debt Instrument [Line Items]
Long-term debt	$ 381,672			376,816
Senior Notes | 3.600% Senior Notes due 2029 | RenaissanceRe Finance, Inc. | Carrying Value
Debt Instrument [Line Items]
Long-term debt	$ 396,279			396,051
Senior Notes | 3.450% Senior Notes due 2027 | RenaissanceRe Finance, Inc.
Debt Instrument [Line Items]
Stated interest rate	3.45%
Senior Notes | 3.450% Senior Notes due 2027 | RenaissanceRe Finance, Inc. | Fair Value
Debt Instrument [Line Items]
Long-term debt	$ 293,037			290,070
Senior Notes | 3.450% Senior Notes due 2027 | RenaissanceRe Finance, Inc. | Carrying Value
Debt Instrument [Line Items]
Long-term debt	$ 298,888			298,765
Senior Notes | 3.700% Senior Notes due 2025 | RenaissanceRe Finance, Inc.
Debt Instrument [Line Items]
Stated interest rate	3.70%				3.70%
Senior Notes | 3.700% Senior Notes due 2025 | RenaissanceRe Finance, Inc. | Fair Value
Debt Instrument [Line Items]
Long-term debt	$ 299,904			299,550
Senior Notes | 3.700% Senior Notes due 2025 | RenaissanceRe Finance, Inc. | Carrying Value
Debt Instrument [Line Items]
Long-term debt	$ 300,000			299,908
Senior Notes | 4.750% Senior Notes due 2025 (DaVinci) | DaVinci Holdings Ltd.
Debt Instrument [Line Items]
Stated interest rate	4.75%	4.75%
Senior Notes | 4.750% Senior Notes due 2025 (DaVinci) | DaVinci Holdings Ltd. | Fair Value
Debt Instrument [Line Items]
Long-term debt	$ 149,951			149,363
Senior Notes | 4.750% Senior Notes due 2025 (DaVinci) | DaVinci Holdings Ltd. | Carrying Value
Debt Instrument [Line Items]
Long-term debt	149,974			149,897
Line of Credit | Medici Revolving Credit Facility | Fair Value | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	75,000			0
Line of Credit | Medici Revolving Credit Facility | Carrying Value | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	$ 75,000			$ 0

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