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SUBSEQUENT EVENTS (Details) - USD ($)		1 Months Ended		12 Months Ended
SUBSEQUENT EVENTS (Details) - USD ($)	Jan. 01, 2026	Feb. 06, 2026	Jan. 31, 2026	Dec. 31, 2025	Dec. 31, 2024	Feb. 11, 2026	Nov. 05, 2025
Subsequent Event [Line Items]
Other liabilities				$ 856,302,000	$ 1,060,129,000
Primary Beneficiary \| DaVinci
Subsequent Event [Line Items]
Noncontrolling ownership percentage				24.30%	25.40%
Primary Beneficiary \| Fontana
Subsequent Event [Line Items]
Noncontrolling ownership percentage				28.70%	26.50%
Primary Beneficiary \| Medici
Subsequent Event [Line Items]
Noncontrolling ownership percentage				11.30%	15.80%
DaVinci \| Primary Beneficiary
Subsequent Event [Line Items]
Redemption of shares from redeemable noncontrolling interests				$ 26,929,000	$ 406,849,000
Noncontrolling interest, value subscribed				70,007,000	300,020,000
Other liabilities				554,800,000	440,700,000
Medici \| Primary Beneficiary
Subsequent Event [Line Items]
Redemption of shares from redeemable noncontrolling interests				604,392,000	406,644,000
Noncontrolling interest, value subscribed				208,451,000	200,219,000
Other liabilities				133,200,000	151,100,000
Vermeer \| Primary Beneficiary
Subsequent Event [Line Items]
Noncontrolling interest, value subscribed				0	175,000,000
Other liabilities				320,200,000	58,400,000
Third-Party Investors \| Primary Beneficiary
Subsequent Event [Line Items]
Redemption of shares from redeemable noncontrolling interests				26,900,000	225,900,000
Third-Party Investors \| Medici \| Primary Beneficiary
Subsequent Event [Line Items]
Redemption of shares from redeemable noncontrolling interests				804,400,000	382,000,000.0
Noncontrolling interest, value subscribed				258,500,000	250,200,000
Other liabilities				43,000,000.0
Payments of dividends				15,300,000	24,600,000
RenaissanceRe Holdings Ltd. \| Medici \| Primary Beneficiary
Subsequent Event [Line Items]
Redemption of shares from redeemable noncontrolling interests				200,000,000.0	300,000
Noncontrolling interest, value subscribed				50,200,000	50,600,000
Fontana \| Primary Beneficiary
Subsequent Event [Line Items]
Redemption of shares from redeemable noncontrolling interests				72,000,000.0
Noncontrolling interest, value subscribed				$ 100,000,000.0	$ 50,000,000.0
Common Stock
Subsequent Event [Line Items]
Share repurchase program, shares repurchased (in shares)				6,400,000
Value of shares repurchased				$ 1,600,000,000
Shares repurchased, average price per share (in usd per share)				$ 247.62
Share repurchase program, authorized aggregate amount							$ 750,000,000.0
Subsequent Event \| Primary Beneficiary \| DaVinci
Subsequent Event [Line Items]
Noncontrolling ownership percentage	26.30%
Subsequent Event \| Primary Beneficiary \| Fontana
Subsequent Event [Line Items]
Noncontrolling ownership percentage	38.40%
Subsequent Event \| Primary Beneficiary \| Medici
Subsequent Event [Line Items]
Noncontrolling ownership percentage			11.50%
Subsequent Event \| Medici \| Primary Beneficiary
Subsequent Event [Line Items]
Redemption of shares from redeemable noncontrolling interests			$ 27,400,000
Subsequent Event \| Third-Party Investors \| Primary Beneficiary
Subsequent Event [Line Items]
Redemption of shares from redeemable noncontrolling interests	$ 81,300,000
Subsequent Event \| Third-Party Investors \| DaVinci
Subsequent Event [Line Items]
Redemption of shares from redeemable noncontrolling interests	750,000,000.0
Subsequent Event \| Third-Party Investors \| Medici \| Primary Beneficiary
Subsequent Event [Line Items]
Noncontrolling interest, value subscribed			43,000,000.0
Subsequent Event \| Third-Party Investors \| Vermeer
Subsequent Event [Line Items]
Payments of dividends			$ 150,000,000.0
Subsequent Event \| RenaissanceRe Holdings Ltd. \| DaVinci
Subsequent Event [Line Items]
Redemption of shares from redeemable noncontrolling interests	182,500,000
Subsequent Event \| Fontana \| Primary Beneficiary
Subsequent Event [Line Items]
Redemption of shares from redeemable noncontrolling interests	$ 79,300,000
Subsequent Event \| Common Stock
Subsequent Event [Line Items]
Share repurchase program, shares repurchased (in shares)		470,930
Value of shares repurchased		$ 130,000,000.0
Shares repurchased, average price per share (in usd per share)		$ 276.04
Share repurchase program, authorized aggregate amount						$ 750,000,000