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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