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FAIR VALUE MEASUREMENTS - Narrative (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
day
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Other investments $ 4,239,952   $ 4,324,761
Other liabilities 1,334   2,434
Debt (Note 7) 2,753,738   1,886,689
Long-term debt, fair value $ 2,700,000   1,900,000
Number of business days required for redemption notice | day 4    
Net income $ 169,991 $ 373,642  
RenaissanceRe Medici UCITS Fund      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Noncontrolling ownership percentage 40.40%    
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 341,500    
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 1,100    
Net Investment Income | Term Loans      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Net unrealized (losses) gains recognized in earnings (49,000) 26,000  
Fair Value, Measurements, Recurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Other investments 4,239,952   4,324,761
Other liabilities     41,745
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Other investments 1,821,837   2,152,485
Other liabilities 6,181   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 168,689   168,089
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 168,700   168,100
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Other investments 38,987   43,777
Other liabilities 234   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 38,987   43,777
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 234   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 38,987   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   $ 97,400  
Fair Value Measured at Net Asset Value Per Share      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total net asset value $ 2,379,128   $ 2,128,499
U.S. Treasuries      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Weighted average effective yield 4.00%   4.40%
Corporate      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Weighted average effective yield 5.30%   5.50%
Agencies      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Weighted average effective yield 4.50%   4.70%
Non-U.S. Government      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Weighted average effective yield 4.20%   4.50%
Residential Mortgage-backed      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Weighted average effective yield 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 5.60%   5.70%
Weighted average life 3 years 7 months 6 days   3 years 9 months 18 days
Asset-backed      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Weighted average effective yield 5.90%   5.90%
Weighted average life 4 years 7 months 6 days   4 years 8 months 12 days
Short Term Investments      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Weighted average effective yield 4.30%   4.20%
Other Short Term Investments      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Weighted average effective yield 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 $ 1,268,388   $ 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 $ 630,765   $ 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 141,084    
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 $ 348,800