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FAIR VALUE MEASUREMENTS - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) day | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other investments | $ 4,432,389 |  | $ 4,432,389 |  | $ 4,324,761
Fixed maturity investments trading | 23,772,222 |  | 23,772,222 |  | 23,562,514
Other liabilities | 197 |  | 197 |  | 2,434
Debt (Note 7) | 2,229,135 |  | 2,229,135 |  | 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 | $ 916,510 | $ 1,182,487 | $ 1,921,852 | $ 2,060,019 |
RenaissanceRe Medici UCITS Fund |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Noncontrolling ownership percentage | 37.90% |  | 37.90% |  |
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 |  |  | 356,500 |  |
RenaissanceRe Medici UCITS Fund |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Net income | $ 7,500 |  | 11,000 |  |
Net Investment Income | Term Loans |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Net unrealized (losses) gains recognized in earnings | 74,200 | 208,500 | 94,000 | 197,100 |
Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other investments | 4,432,389 |  | 4,432,389 |  | 4,324,761
Fixed maturity investments trading | 23,772,222 |  | 23,772,222 |  | 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 | 1,456,067 |  | 1,456,067 |  | 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 | 1,859,028 |  | 1,859,028 |  | 2,152,485
Fixed maturity investments trading | 13,310,346 |  | 13,310,346 |  | 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 | 149,751 |  | 149,751 |  | 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 | 1,417,242 |  | 1,417,242 |  | 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 | 149,800 |  | 149,800 |  | 168,100
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other investments | 32,512 |  | 32,512 |  | 43,777
Fixed maturity investments trading | 38,825 |  | 38,825 |  | 0
Other liabilities | 93 |  | 93 |  | 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 | 32,512 |  | 32,512 |  | 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 | 38,825 |  | 38,825 |  | 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 | 93 |  | 93 |  | 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 | 32,512 |  | 32,512 |  | 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 |  | $ 94,600 |  | $ 94,600 |
Fair Value Measured at Net Asset Value Per Share |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Total net asset value | $ 2,540,849 |  | $ 2,540,849 |  | $ 2,128,499
U.S. Treasuries |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 3.80% |  | 3.80% |  | 4.40%
Corporate |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 4.80% |  | 4.80% |  | 5.50%
Agencies |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 4.40% |  | 4.40% |  | 4.70%
Non-U.S. Government |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 4.00% |  | 4.00% |  | 4.50%
Residential Mortgage-backed |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 5.00% |  | 5.00% |  | 5.40%
Weighted average life |  |  | 6 years 9 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 | 5.10% |  | 5.10% |  | 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 | 5.50% |  | 5.50% |  | 5.90%
Weighted average life |  |  | 2 years 10 months 24 days |  | 4 years 8 months 12 days
Short Term Investments |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 3.90% |  | 3.90% |  | 4.20%
Other Short Term Investments |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 4.00% |  | 4.00% |  | 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 | $ 1,295,385 |  | $ 1,295,385 |  | $ 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 | 689,750 |  | $ 689,750 |  | $ 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 | 150,979 |  | 150,979 |  |
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 | $ 398,300 |  | $ 398,300 |  |

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