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FAIR VALUE MEASUREMENTS - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) day | Jun. 30, 2024 USD ($) | Dec. 31, 2024 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other investments | $ 4,476,056 |  | $ 4,476,056 |  | $ 4,324,761
Fixed maturity investments trading | 23,332,063 |  | 23,332,063 |  | 23,562,514
Other liabilities | 317 |  | 317 |  | 2,434
Debt (Note 7) | 2,263,379 |  | 2,263,379 |  | 1,886,689
Long-term debt, fair value | 2,300,000 |  | $ 2,300,000 |  | 1,900,000
Number of business days required for redemption notice | day |  |  | 4 |  |
Net income | $ 835,351 | $ 503,890 | $ 1,005,342 | $ 877,532 |
RenaissanceRe Medici UCITS Fund |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Noncontrolling ownership percentage | 38.50% |  | 38.50% |  |
RenaissanceRe Medici UCITS Fund |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Transfer in kind from existing investors |  |  | $ 316,500 |  |
Third-Party Investors | RenaissanceRe Medici UCITS Fund |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Sale of shares to redeemable noncontrolling interests |  |  | 348,700 |  |
RenaissanceRe Holdings Ltd. | RenaissanceRe Medici UCITS Fund |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Sale of shares to redeemable noncontrolling interests |  |  | 140,000 |  |
RenaissanceRe Medici UCITS Fund |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Net income | $ 2,400 |  | 3,500 |  |
Net Investment Income | Term Loans |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Net unrealized (losses) gains recognized in earnings | 68,700 | (37,500) | 19,800 | (11,400) |
Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other investments | 4,476,056 |  | 4,476,056 |  | 4,324,761
Fixed maturity investments trading | 23,332,063 |  | 23,332,063 |  | 23,562,514
Other liabilities |  |  |  |  | 41,745
Fair Value, Measurements, Recurring | Asset-backed |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fixed maturity investments trading | 1,454,458 |  | 1,454,458 |  | 1,422,393
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other investments | 1,877,795 |  | 1,877,795 |  | 2,152,485
Fixed maturity investments trading | 12,467,505 |  | 12,467,505 |  | 12,560,621
Other liabilities |  |  |  |  | 44,082
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Direct private equity investments |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other investments | 191,009 |  | 191,009 |  | 168,089
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Asset-backed |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fixed maturity investments trading | 1,413,522 |  | 1,413,522 |  | 1,422,393
Significant Other Observable Inputs (Level 2) | Quoted Prices | Fair Value, Measurements, Recurring | Direct private equity investments |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other investments | 191,000 |  | 191,000 |  | 168,100
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other investments | 35,308 |  | 35,308 |  | 43,777
Fixed maturity investments trading | 40,936 |  | 40,936 |  | 0
Other liabilities | 150 |  | 150 |  | 405
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Direct private equity investments |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other investments | 35,308 |  | 35,308 |  | 43,777
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Asset-backed |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fixed maturity investments trading | 40,936 |  | 40,936 |  | 0
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other liabilities | 150 |  | 150 |  | 405
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Direct private equity investments |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other investments | 35,308 |  | 35,308 |  | 43,777
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Term Loans |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other investments |  | $ 96,600 |  | $ 96,600 |
Fair Value Measured at Net Asset Value Per Share |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Total net asset value | $ 2,562,953 |  | $ 2,562,953 |  | $ 2,128,499
U.S. Treasuries |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 3.90% |  | 3.90% |  | 4.40%
Corporate |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 5.00% |  | 5.00% |  | 5.50%
Agencies |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 4.50% |  | 4.50% |  | 4.70%
Non-U.S. Government |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 4.10% |  | 4.10% |  | 4.50%
Residential Mortgage-backed |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 5.20% |  | 5.20% |  | 5.40%
Weighted average life |  |  | 7 years 3 months 18 days |  | 7 years 8 months 12 days
Commercial Mortgage-backed |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 5.30% |  | 5.30% |  | 5.70%
Weighted average life |  |  | 3 years 7 months 6 days |  | 3 years 9 months 18 days
Asset-backed | Significant Other Observable Inputs (Level 2) |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 5.80% |  | 5.80% |  | 5.90%
Weighted average life |  |  | 2 years 9 months 18 days |  | 4 years 8 months 12 days
Short Term Investments |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 4.20% |  | 4.20% |  | 4.20%
Other Short Term Investments |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 4.30% |  | 4.30% |  | 4.40%
Private Credit Funds | Minimum |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Liquidation period for fund assets |  |  | 5 years |  |
Private Credit Funds | Maximum |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Liquidation period for fund assets |  |  | 10 years |  |
Private Credit Funds | Fair Value Measured at Net Asset Value Per Share |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Total net asset value | $ 1,337,818 |  | $ 1,337,818 |  | $ 1,181,146
Direct private equity investments | Minimum |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Liquidation period for fund assets |  |  | 5 years |  |
Direct private equity investments | Maximum |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Liquidation period for fund assets |  |  | 10 years |  |
Direct private equity investments | Fair Value Measured at Net Asset Value Per Share |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Total net asset value | 702,066 |  | $ 702,066 |  | $ 609,105
Insurance-linked securities funds | Fair Value Measured at Net Asset Value Per Share |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Total net asset value | 143,454 |  | 143,454 |  |
Insurance-linked securities funds | Fair Value Measured at Net Asset Value Per Share | RenaissanceRe Medici UCITS Fund |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Total net asset value | $ 372,300 |  | $ 372,300 |  |

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