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VARIABLE INTEREST ENTITIES (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2025 USD ($) account | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) account | Jun. 30, 2024 USD ($) | Mar. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Number of segregated accounts | account | 4 |  | 4 |  |  |  |  |
Assets | $ 54,727,523 |  | $ 54,727,523 |  |  | $ 50,707,550 |  |
Liabilities | 36,884,722 |  | 36,884,722 |  |  | 33,155,789 |  |
Investments in other ventures, under equity method | 112,580 |  | 112,580 |  |  | 102,770 |  |
Redeemable noncontrolling interests | 7,043,107 |  | 7,043,107 |  |  | 6,977,749 |  |
Ceded premiums written | 650,910 | $ 586,984 | 1,362,884 | $ 1,378,095 |  |  |  |
Ceded premiums earned | 449,130 | 435,876 | 835,570 | 868,906 |  |  |  |
Vermeer |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Redeemable noncontrolling interests | 1,750,202 | 1,489,892 | 1,750,202 | 1,489,892 | $ 1,692,777 | 1,799,857 | $ 1,433,268 | $ 1,555,297
Fontana |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Redeemable noncontrolling interests | 549,124 | $ 453,744 | 549,124 | 453,744 | $ 535,656 | 469,439 | $ 451,397 | $ 353,823
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Assets | 1,300,000 |  | 1,300,000 |  |  | 1,900,000 |  |
Liabilities | 1,300,000 |  | 1,300,000 |  |  | 1,900,000 |  |
Net assets | 34,800 |  | 34,800 |  |  | 60,500 |  |
Variable Interest Entity, Primary Beneficiary | Vermeer |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Assets | 2,200,000 |  | 2,200,000 |  |  | 1,900,000 |  |
Liabilities | 477,300 |  | 477,300 |  |  | 93,000 |  |
Redeemable noncontrolling interests | 1,800,000 |  | 1,800,000 |  |  | 1,800,000 |  |
Variable Interest Entity, Primary Beneficiary | Fontana |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Assets | 2,600,000 |  | 2,600,000 |  |  | 2,200,000 |  |
Liabilities | 1,800,000 |  | 1,800,000 |  |  | 1,600,000 |  |
Redeemable noncontrolling interests | 549,100 |  | 549,100 |  |  | 469,400 |  |
Variable Interest Entity, Primary Beneficiary | Investors Of Upsilon RFO Diversified I, II and III | Upsilon RFO Re Ltd. |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Payments of capital distribution |  |  | 191,700 | 190,600 |  |  |  |
Net assets | 253,600 |  | 253,600 |  |  | 282,200 |  |
Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd. | Upsilon RFO Re Ltd. |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Payments of capital distribution |  |  | $ 23,600 | $ 33,000 |  |  |  |
Variable interest entity, ownership percentage |  |  | 12.60% | 12.50% |  |  |  |
Variable Interest Entity, Primary Beneficiary | Investors Of Upsilon RFO Diversified IV | Upsilon RFO Re Ltd. |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Payments of capital distribution |  |  | $ 21,900 |  |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | Upsilon Diversified |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Investments in other ventures, under equity method | 400 |  | 400 |  |  | 500 |  |
Variable Interest Entity, Not Primary Beneficiary | NOC1 |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Investments in other ventures, under equity method | 1,800 |  | 1,800 |  |  | 1,700 |  |
Variable Interest Entity, Not Primary Beneficiary | AlphaCat Managers Ltd |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Investments in other ventures, under equity method | 3,200 |  | 3,200 |  |  | 3,600 |  |
Variable Interest Entity, Not Primary Beneficiary | Upsilon Diversified |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Assets | 307,400 |  | 307,400 |  |  | 440,600 |  |
Liabilities | 79,300 |  | 79,300 |  |  | 140,900 |  |
Variable Interest Entity, Not Primary Beneficiary | Upsilon Diversified | Upsilon RFO Re Ltd. |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Investment owned, fair value | 231,400 |  | 231,400 |  |  | 304,000 |  |
Variable Interest Entity, Not Primary Beneficiary | NOC1 |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Assets | 178,200 |  | 178,200 |  |  | 173,400 |  |
Liabilities | 400 |  | 400 |  |  | 2,200 |  |
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Assets | 975,000 |  | 975,000 |  |  | 936,100 |  |
Liabilities | 975,000 |  | 975,000 |  |  | 936,100 |  |
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re | Term Loans |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Investment in participating notes | 4,300 |  | 4,300 |  |  | 7,000 |  |
Variable Interest Entity, Not Primary Beneficiary | Tailwind Re Ltd |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Assets | 100 |  | 100 |  |  | 416,800 |  |
Liabilities | 100 |  | 100 |  |  | 416,800 |  |
Variable Interest Entity, Not Primary Beneficiary | AlphaCat Managers Ltd |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Assets | 1,500,000 |  | 1,500,000 |  |  | 3,000,000 |  |
Liabilities | 900,000 |  | 900,000 |  |  | 1,300,000 |  |
Variable Interest Entity, Not Primary Beneficiary | RenaissanceRe Holdings Ltd. | Upsilon Diversified |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Payments of capital distribution |  |  | 200 |  |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | RenaissanceRe Holdings Ltd. | Tailwind Re Ltd |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Ceded premiums written |  |  |  | $ 42,700 |  |  |  |
Ceded premiums earned |  |  |  | 21,200 |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | Investors Of Upsilon RFO Diversified IV | Upsilon RFO Re Ltd. |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Net assets | $ 108,000 |  | 108,000 |  |  | $ 115,900 |  |
Variable Interest Entity, Not Primary Beneficiary | Third Party Investor | Upsilon Diversified |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Payments of capital distribution |  |  | 177,400 | 165,100 |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | Third Party Investor | Upsilon Diversified | Preference shares |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Investment in variable interest entity |  |  | 17,500 | 16,900 |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | Third Party Investor | NOC1 | Preference shares |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Investment in variable interest entity |  |  |  | 20,000 |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | Renaissance Reinsurance Ltd. | Mona Lisa Re |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Ceded premiums written |  |  | 57,500 | 31,200 |  |  |  |
Ceded premiums earned |  |  | 35,700 | 17,000 |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | DaVinci Reinsurance Ltd. | Mona Lisa Re |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Ceded premiums written |  |  | 14,300 | 7,800 |  |  |  |
Ceded premiums earned |  |  | $ 8,900 | $ 4,200 |  |  |  |

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