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DEBT AND CREDIT FACILITIES - Debt Obligations Narrative (Details) - USD ($) |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 05, 2023 | Apr. 02, 2019 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Jun. 29, 2017 | May 04, 2015 | Mar. 24, 2015 | Feb. 25, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Issuance of debt, net of expenses |  |  | $ 0 | $ 740,581,000 | $ 0 |  |  |  |
Bridge Loan | Platinum Underwriters Holdings, Ltd. |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  |  |  |  |  |  | $ 300,000,000.0
3.600% Senior Notes due 2029 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate |  | 3.60% | 3.60% |  |  |  |  |  |
3.450% Senior Notes due 2027 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate |  |  | 3.45% |  |  | 3.45% |  |  |
3.700% Senior Notes due 2025 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate |  |  | 3.70% |  |  |  |  | 3.70% |
Senior Notes | 5.750% Senior Notes due 2033 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | 5.75% |  | 5.75% |  |  |  |  |  |
Face amount | $ 750,000,000.0 |  |  |  |  |  |  |  |
Issuance of debt, net of expenses | $ 741,000,000 |  |  |  |  |  |  |  |
Senior Notes | 3.600% Senior Notes due 2029 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  | $ 400,000,000.0 |  |  |  |  |  |  |
Repayments of long-term lines of credit |  | $ 200,000,000.0 |  |  |  |  |  |  |
RenaissanceRe Finance, Inc. | 3.700% Senior Notes due 2025 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  | $ 300,000,000.0 |
RenaissanceRe Finance, Inc. | Senior Notes | 3.450% Senior Notes due 2027 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  | $ 300,000,000.0 |  |  |
DaVinci |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Loan agreement with related party |  |  |  |  |  |  | $ 100,000,000.0 |  |
DaVinci | 4.750% Senior Notes Due May 1, 2025 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate |  |  | 4.75% |  |  |  | 4.75% |  |
Face amount |  |  |  |  |  |  | $ 150,000,000.0 |  |

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