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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% |  |  |  |

X
- Definition This item limits the aggregate of all share repurchase requests to 25% of DaVinciRe's capital in any given year and satisfying all applicable regulatory requirements. If total shareholder requests exceed 25% of DaVinciRe's capital, the number of shares repurchased will be reduced among the requesting shareholders pro-rata, based on the amounts desired to be repurchased. + References No definition available. + Details
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