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NONCONTROLLING INTERESTS - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023
Redeemable Noncontrolling Interest [Line Items]
Assets	$ 54,498,074,000		$ 54,498,074,000			$ 50,707,550,000
Liabilities	35,526,649,000		35,526,649,000			33,155,789,000
Redeemable noncontrolling interests	7,469,059,000		7,469,059,000			6,977,749,000
Variable Interest Entity, Primary Beneficiary
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests	7,469,059,000		7,469,059,000			6,977,749,000
DaVinciRe Holdings Ltd. | Variable Interest Entity, Primary Beneficiary
Redeemable Noncontrolling Interest [Line Items]
Sale of shares to redeemable noncontrolling interests			69,700,000	$ 300,000,000.0
Proceeds from noncontrolling interests			0
Third-Party Investors | Variable Interest Entity, Primary Beneficiary
Redeemable Noncontrolling Interest [Line Items]
Redemption of shares from redeemable noncontrolling interest			26,900,000	225,900,000
RenaissanceRe Holdings Ltd. | Variable Interest Entity, Primary Beneficiary
Redeemable Noncontrolling Interest [Line Items]
Proceeds from noncontrolling interests				114,200,000
Redemptions of third-party redeemable noncontrolling interest shares				(270,000,000)
DaVinci Holdings Ltd. | Variable Interest Entity, Primary Beneficiary
Redeemable Noncontrolling Interest [Line Items]
Proceeds from noncontrolling interests				0
Redemptions of third-party redeemable noncontrolling interest shares			(26,900,000)	(225,900,000)
Medici | Variable Interest Entity, Primary Beneficiary
Redeemable Noncontrolling Interest [Line Items]
Proceeds from noncontrolling interests			121,600,000
Redemptions of third-party redeemable noncontrolling interest shares			(367,700,000)
Fontana Third Party Investors | Variable Interest Entity, Primary Beneficiary
Redeemable Noncontrolling Interest [Line Items]
Sale of shares to redeemable noncontrolling interests			100,000,000.0	50,000,000.0
Redemption of shares from redeemable noncontrolling interest			72,000,000.0
Proceeds from noncontrolling interests			0	0
Redemptions of third-party redeemable noncontrolling interest shares			(72,000,000.0)
DaVinciRe Holdings Ltd. | Variable Interest Entity, Primary Beneficiary
Redeemable Noncontrolling Interest [Line Items]
Redemption of shares from redeemable noncontrolling interest	0	$ 25,000,000	26,929,000	406,849,000
Assets	7,500,000,000		7,500,000,000			6,100,000,000
Liabilities	2,900,000,000		2,900,000,000			2,000,000,000.0
Redeemable noncontrolling interests	$ 3,454,255,000	2,958,452,000	$ 3,454,255,000	2,958,452,000	$ 3,210,791,000	3,061,708,000	$ 2,760,164,000	$ 2,541,482,000
DaVinciRe Holdings Ltd. | Third-Party Investors | Variable Interest Entity, Primary Beneficiary
Redeemable Noncontrolling Interest [Line Items]
Redemptions of third-party redeemable noncontrolling interest shares				(180,600,000)
DaVinciRe Holdings Ltd. | RenaissanceRe Holdings Ltd. | Variable Interest Entity, Primary Beneficiary
Redeemable Noncontrolling Interest [Line Items]
Redemptions of third-party redeemable noncontrolling interest shares				(69,400,000)
DaVinciRe Holdings Ltd. | Maximum | Variable Interest Entity, Primary Beneficiary
Redeemable Noncontrolling Interest [Line Items]
Share repurchase requests, limit	25.00%		25.00%
Medici | Variable Interest Entity, Primary Beneficiary
Redeemable Noncontrolling Interest [Line Items]
Sale of shares to redeemable noncontrolling interests	$ 17,895,000	15,319,000	$ 160,827,000	183,040,000
Redemption of shares from redeemable noncontrolling interest	7,143,000	83,614,000	302,672,000	311,164,000
Assets	1,800,000,000		1,800,000,000			2,100,000,000
Liabilities	4,000,000.0		4,000,000.0			151,800,000
Redeemable noncontrolling interests	1,623,315,000	1,680,520,000	$ 1,623,315,000	1,680,520,000	1,532,990,000	1,646,745,000	1,631,508,000	1,650,229,000
Redemption provision, notice period			30 days
Medici | Third-Party Investors | Variable Interest Entity, Primary Beneficiary
Redeemable Noncontrolling Interest [Line Items]
Sale of shares to redeemable noncontrolling interests			$ 210,800,000	233,000,000.0
Redemption of shares from redeemable noncontrolling interest			502,700,000	311,200,000
Payments of dividends			15,300,000	24,600,000
Medici | RenaissanceRe Holdings Ltd. | Variable Interest Entity, Primary Beneficiary
Redeemable Noncontrolling Interest [Line Items]
Sale of shares to redeemable noncontrolling interests			50,200,000	50,600,000
Redemption of shares from redeemable noncontrolling interest			200,000,000.0	300,000
RenaissanceRe Medici UCITS Fund
Redeemable Noncontrolling Interest [Line Items]
Transfer in kind from existing investors			316,500,000
RenaissanceRe Medici UCITS Fund | Variable Interest Entity, Primary Beneficiary
Redeemable Noncontrolling Interest [Line Items]
Transfer in kind from existing investors			316,500,000
RenaissanceRe Medici UCITS Fund | Third-Party Investors
Redeemable Noncontrolling Interest [Line Items]
Sale of shares to redeemable noncontrolling interests			356,500,000
RenaissanceRe Medici UCITS Fund | RenaissanceRe Holdings Ltd. | Variable Interest Entity, Primary Beneficiary
Redeemable Noncontrolling Interest [Line Items]
Sale of shares to redeemable noncontrolling interests			140,000,000.0
Vermeer | Variable Interest Entity, Primary Beneficiary
Redeemable Noncontrolling Interest [Line Items]
Sale of shares to redeemable noncontrolling interests	0	175,000,000	0	175,000,000
Assets	2,100,000,000		2,100,000,000			1,900,000,000
Liabilities	234,800,000		234,800,000			93,000,000.0
Redeemable noncontrolling interests	1,821,183,000	1,738,426,000	1,821,183,000	1,738,426,000	1,750,202,000	1,799,857,000	1,489,892,000	1,555,297,000
Vermeer | PFZW | Variable Interest Entity, Primary Beneficiary
Redeemable Noncontrolling Interest [Line Items]
Payments of dividends			0	175,000,000.0
Fontana | Variable Interest Entity, Primary Beneficiary
Redeemable Noncontrolling Interest [Line Items]
Sale of shares to redeemable noncontrolling interests	0	0	129,155,000	100,000,000
Redemption of shares from redeemable noncontrolling interest	0	0	72,044,000	0
Assets	2,700,000,000		2,700,000,000			2,200,000,000
Liabilities	1,900,000,000		1,900,000,000			1,600,000,000
Redeemable noncontrolling interests	$ 570,306,000	$ 483,601,000	570,306,000	483,601,000	$ 549,124,000	$ 469,439,000	$ 453,744,000	$ 353,823,000
Fontana | Third-Party Investors | Variable Interest Entity, Primary Beneficiary
Redeemable Noncontrolling Interest [Line Items]
Sale of shares to redeemable noncontrolling interests			100,000,000.0	100,000,000.0
Fontana | RenaissanceRe Holdings Ltd. | Variable Interest Entity, Primary Beneficiary
Redeemable Noncontrolling Interest [Line Items]
Sale of shares to redeemable noncontrolling interests			$ 70,800,000	$ 50,000,000.0
DaVinciRe Holdings Ltd. | Variable Interest Entity, Primary Beneficiary
Redeemable Noncontrolling Interest [Line Items]
Noncontrolling ownership percentage	24.30%	25.40%	24.30%	25.40%		25.40%
Medici | Variable Interest Entity, Primary Beneficiary
Redeemable Noncontrolling Interest [Line Items]
Noncontrolling ownership percentage	9.60%	15.10%	9.60%	15.10%
Vermeer | Medici | Variable Interest Entity, Primary Beneficiary | Voting, Non-participating Shares
Redeemable Noncontrolling Interest [Line Items]
Parent company ownership in redeemable noncontrolling interest	100.00%		100.00%
Vermeer | PFZW | Variable Interest Entity, Primary Beneficiary | Participating, Non-voting Common Shares
Redeemable Noncontrolling Interest [Line Items]
Parent company ownership in redeemable noncontrolling interest	100.00%		100.00%
Fontana | Variable Interest Entity, Primary Beneficiary
Redeemable Noncontrolling Interest [Line Items]
Noncontrolling ownership percentage	28.70%	26.50%	28.70%	26.50%

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