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NONCONTROLLING INTERESTS - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
DaVinci Reinsurance Ltd.          
Redeemable Noncontrolling Interest [Line Items]          
Sale of shares to redeemable noncontrolling interests     $ 69,700,000 $ 300,000,000.0  
Proceeds from noncontrolling interests     0    
Third-Party Investors          
Redeemable Noncontrolling Interest [Line Items]          
Redemption of shares from redeemable noncontrolling interest     26,900,000 201,100,000  
RenaissanceRe Holdings Ltd.          
Redeemable Noncontrolling Interest [Line Items]          
Proceeds from noncontrolling interests       92,400,000  
Payments to noncontrolling interests       200,900,000  
DaVinci Holdings Ltd.          
Redeemable Noncontrolling Interest [Line Items]          
Proceeds from noncontrolling interests       0  
Payments to noncontrolling interests     26,900,000 381,700,000  
Medici          
Redeemable Noncontrolling Interest [Line Items]          
Proceeds from noncontrolling interests     103,800,000    
Payments to noncontrolling interests     359,600,000    
Fontana Third Party Investors          
Redeemable Noncontrolling Interest [Line Items]          
Sale of shares to redeemable noncontrolling interests     100,000,000.0 50,000,000  
Redemption of shares from redeemable noncontrolling interest     72,000,000.0    
Proceeds from noncontrolling interests     0 0  
Payments to noncontrolling interests     72,000,000.0    
DaVinci Holdings Ltd.          
Redeemable Noncontrolling Interest [Line Items]          
Redemption of shares from redeemable noncontrolling interest $ 0 $ 26,147,000 $ 26,929,000 381,849,000  
DaVinci Holdings Ltd. | Third-Party Investors          
Redeemable Noncontrolling Interest [Line Items]          
Payments to noncontrolling interests       180,600,000  
DaVinci Holdings Ltd. | RenaissanceRe Holdings Ltd.          
Redeemable Noncontrolling Interest [Line Items]          
Payments to noncontrolling interests       69,400,000  
DaVinci Holdings Ltd. | Maximum          
Redeemable Noncontrolling Interest [Line Items]          
Share repurchase requests, limit 25.00%   25.00%    
Medici          
Redeemable Noncontrolling Interest [Line Items]          
Sale of shares to redeemable noncontrolling interests $ 81,329,000 21,479,000 $ 142,932,000 167,721,000  
Redemption of shares from redeemable noncontrolling interest 56,734,000 181,983,000 $ 295,529,000 227,550,000  
Redemption provision, notice period     30 days    
Medici | Third-Party Investors          
Redeemable Noncontrolling Interest [Line Items]          
Sale of shares to redeemable noncontrolling interests     $ 192,900,000 167,200,000  
Redemption of shares from redeemable noncontrolling interest     495,500,000 227,300,000  
Payments of dividends     15,300,000 18,400,000  
Medici | RenaissanceRe Holdings Ltd.          
Redeemable Noncontrolling Interest [Line Items]          
Sale of shares to redeemable noncontrolling interests     50,100,000    
Redemption of shares from redeemable noncontrolling interest     200,000,000.0    
RenaissanceRe Medici UCITS Fund          
Redeemable Noncontrolling Interest [Line Items]          
Transfer in kind from existing investors     316,500,000    
RenaissanceRe Medici UCITS Fund | Third-Party Investors          
Redeemable Noncontrolling Interest [Line Items]          
Sale of shares to redeemable noncontrolling interests     348,700,000    
RenaissanceRe Medici UCITS Fund | RenaissanceRe Holdings Ltd.          
Redeemable Noncontrolling Interest [Line Items]          
Sale of shares to redeemable noncontrolling interests     140,000,000.0    
Vermeer          
Redeemable Noncontrolling Interest [Line Items]          
Sale of shares to redeemable noncontrolling interests     0    
Vermeer | PFZW          
Redeemable Noncontrolling Interest [Line Items]          
Payments of dividends     0 175,000,000.0  
Fontana          
Redeemable Noncontrolling Interest [Line Items]          
Sale of shares to redeemable noncontrolling interests 0 0 129,155,000 100,000,000  
Redemption of shares from redeemable noncontrolling interest $ 0 $ 0 72,044,000 0  
Fontana | Third-Party Investors          
Redeemable Noncontrolling Interest [Line Items]          
Sale of shares to redeemable noncontrolling interests     100,000,000.0 100,000,000.0  
Fontana | RenaissanceRe Holdings Ltd.          
Redeemable Noncontrolling Interest [Line Items]          
Sale of shares to redeemable noncontrolling interests     $ 70,800,000 $ 50,000,000  
DaVinci Reinsurance Ltd.          
Redeemable Noncontrolling Interest [Line Items]          
Noncontrolling ownership percentage 24.30% 24.70% 24.30% 24.70% 25.40%
Medici          
Redeemable Noncontrolling Interest [Line Items]          
Noncontrolling ownership percentage 9.70% 12.40% 9.70% 12.40%  
Vermeer | Medici | Voting, Non-participating Shares          
Redeemable Noncontrolling Interest [Line Items]          
Parent company ownership in redeemable noncontrolling interest 100.00%   100.00%    
Vermeer | PFZW | Participating, Non-voting Common Shares          
Redeemable Noncontrolling Interest [Line Items]          
Parent company ownership in redeemable noncontrolling interest 100.00%   100.00%    
Fontana          
Redeemable Noncontrolling Interest [Line Items]          
Noncontrolling ownership percentage 28.70% 26.50% 28.70% 26.50%