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VARIABLE INTEREST ENTITIES (Details) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 10, 2023 USD ($) note | Jul. 26, 2023 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Assets |  |  | $ 41,399,915,000 |  |  | $ 41,399,915,000 |  | $ 36,552,878,000 |  |
Liabilities |  |  | 28,320,840,000 |  |  | 28,320,840,000 |  | 26,692,215,000 |  |
Investments in other ventures, under equity method |  |  | 89,505,000 |  |  | 89,505,000 |  | 79,750,000 |  |
Redeemable noncontrolling interests |  |  | 5,676,262,000 |  |  | 5,676,262,000 |  | 4,535,389,000 |  |
Ceded premiums written |  |  | 455,818,000 |  | $ 601,023,000 | 982,376,000 | $ 1,378,770,000 |  |  |
Ceded premiums earned |  |  | 399,474,000 |  | 432,440,000 | 816,612,000 | 879,044,000 |  |  |
Vermeer Reinsurance Ltd. |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interests |  |  | 1,590,408,000 | $ 1,538,245,000 | 1,269,417,000 | 1,590,408,000 | 1,269,417,000 | 1,490,840,000 | $ 1,246,480,000 | $ 1,197,782,000
Fontana |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interests |  |  | 277,886,000 | 276,859,000 | $ 268,143,000 | 277,886,000 | 268,143,000 | 268,031,000 | $ 0 | $ 0
Variable Interest Entity, Primary Beneficiary | Upsilon Diversified |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Investments in other ventures, under equity method |  |  | 1,400,000 |  |  | 1,400,000 |  | 1,900,000 |  |
Variable Interest Entity, Primary Beneficiary | NOC1 |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Investments in other ventures, under equity method |  |  | 1,500,000 |  |  | 1,500,000 |  |  |  |
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Assets |  |  | 3,000,000,000 |  |  | 3,000,000,000 |  | 3,700,000,000 |  |
Liabilities |  |  | 3,000,000,000 |  |  | 3,000,000,000 |  | 3,700,000,000 |  |
Net assets |  |  | 133,200,000 |  |  | 133,200,000 |  | 165,300,000 |  |
Variable Interest Entity, Primary Beneficiary | Upsilon Diversified |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Assets |  |  | 956,300,000 |  |  | 956,300,000 |  | 1,200,000,000 |  |
Liabilities |  |  | 78,800,000 |  |  | 78,800,000 |  | 32,100,000 |  |
Variable Interest Entity, Primary Beneficiary | Upsilon Diversified | Upsilon RFO Re Ltd. |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Investment owned, fair value |  |  | 952,400,000 |  |  | 952,400,000 |  | 1,200,000,000 |  |
Variable Interest Entity, Primary Beneficiary | NOC1 |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Assets |  |  | 153,100,000 |  |  | 153,100,000 |  |  |  |
Liabilities |  |  | 200,000 |  |  | 200,000 |  |  |  |
Variable Interest Entity, Primary Beneficiary | Vermeer Reinsurance Ltd. |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Assets |  |  | 2,000,000,000 |  |  | 2,000,000,000 |  | 1,600,000,000 |  |
Liabilities |  |  | 388,700,000 |  |  | 388,700,000 |  | 144,900,000 |  |
Redeemable noncontrolling interests |  |  | 1,600,000,000 |  |  | 1,600,000,000 |  | 1,500,000,000 |  |
Variable Interest Entity, Primary Beneficiary | Fontana |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Assets |  |  | 1,100,000,000 |  |  | 1,100,000,000 |  | 711,000,000 |  |
Liabilities |  |  | 733,800,000 |  |  | 733,800,000 |  | 319,200,000 |  |
Redeemable noncontrolling interests |  |  | 277,900,000 |  |  | 277,900,000 |  | 268,000,000 |  |
Variable Interest Entity, Primary Beneficiary | Third Party Investor | Upsilon RFO Re Ltd. |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Payments of capital distribution |  |  |  |  |  | 489,600,000 | 188,100,000 |  |  |
Net assets |  |  | 900,000,000 |  |  | 900,000,000 |  | 1,200,000,000 |  |
Variable Interest Entity, Primary Beneficiary | Third Party Investor | Upsilon RFO Re Ltd. | Preference shares |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Contributions to subsidiaries |  |  |  |  |  | 39,800,000 | 89,000,000.0 |  |  |
Variable Interest Entity, Primary Beneficiary | Third Party Investor | Upsilon Diversified |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Payments of capital distribution |  |  |  |  |  | 420,800,000 | 143,500,000 |  |  |
Variable Interest Entity, Primary Beneficiary | Third Party Investor | Upsilon Diversified | Preference shares |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Contributions to subsidiaries |  |  |  |  |  | 30,000,000.0 | $ 82,500,000 |  |  |
Variable Interest Entity, Primary Beneficiary | Third Party Investor | NOC1 | Preference shares |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Contributions to subsidiaries |  |  |  |  |  | 151,500,000 |  |  |  |
Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd. | Upsilon RFO Re Ltd. |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Payments of capital distribution |  |  |  |  |  | $ 62,300,000 |  |  |  |
Variable interest entity, ownership percentage |  |  |  |  |  | 13.10% | 12.70% |  |  |
Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd. | Upsilon RFO Re Ltd. | Preference shares |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Contributions to subsidiaries |  |  |  |  |  | $ 10,200,000 | $ 10,000,000.0 |  |  |
Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd. | Upsilon Diversified |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Payments of capital distribution |  |  |  |  |  | 700,000 | 0 |  |  |
Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd. | Upsilon Diversified | Preference shares |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Contributions to subsidiaries |  |  |  |  |  | 100,000 | 0 |  |  |
Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd. | NOC1 | Preference shares |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Contributions to subsidiaries |  |  |  |  |  | 1,500,000 |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Assets |  |  | 463,500,000 |  |  | 463,500,000 |  | 654,800,000 |  |
Liabilities |  |  | 463,500,000 |  |  | 463,500,000 |  | 654,800,000 |  |
Number of notes issued | note | 2 |  |  |  |  |  |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re | Term loans |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Investment in participating notes |  |  | 3,300,000 |  |  | 3,300,000 |  | 5,700,000 |  |
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re | Eighty Five Million Principal At Risk Variable Rate Note |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount | $ 85,000,000 |  |  |  |  |  |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re | One Hundred Million Principal At Risk Variable Rate Note |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount | $ 100,000,000 |  |  |  |  |  |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re | Four Hundred Million Principal At Risk Variable Rate Note |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount |  |  | 400,000,000 |  |  | 400,000,000 |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | Langhorne Partners |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Investments in other ventures, under equity method |  |  | $ 100,000 |  |  | 100,000 |  | $ 100,000 |  |
Variable Interest Entity, Not Primary Beneficiary | RenaissanceRe Holdings Ltd. | Langhorne Holdings LLC |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Payments of capital distribution |  |  |  | $ 1,500,000 |  |  |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | RenaissanceRe Holdings Ltd. | Langhorne Holdings LLC | Subsequent Event |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Payments of capital distribution |  | $ 800,000 |  |  |  |  |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | Renaissance Reinsurance Ltd. | Mona Lisa Re |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Ceded premiums written |  |  |  |  |  | 18,300,000 | 25,100,000 |  |  |
Ceded premiums earned |  |  |  |  |  | 16,000,000 | 19,500,000 |  |  |
Variable Interest Entity, Not Primary Beneficiary | DaVinci Reinsurance Ltd. | Mona Lisa Re |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Ceded premiums written |  |  |  |  |  | 4,600,000 | 6,200,000 |  |  |
Ceded premiums earned |  |  |  |  |  | 4,000,000 | $ 4,800,000 |  |  |
Variable Interest Entity, Not Primary Beneficiary | Medici | Mona Lisa Re |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Payments of capital distribution |  |  |  |  |  | $ 16,500,000 |  |  |  |

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