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NONCONTROLLING INTERESTS - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2025
Mar. 31, 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 26,900,000 175,000,000.0  
RenaissanceRe Holdings Ltd.      
Redeemable Noncontrolling Interest [Line Items]      
Proceeds from noncontrolling interests   70,700,000  
Payments to noncontrolling interests   59,400,000  
DaVinci Holdings Ltd.      
Redeemable Noncontrolling Interest [Line Items]      
Proceeds from noncontrolling interests   0  
Payments to noncontrolling interests 26,900,000 355,600,000  
Medici      
Redeemable Noncontrolling Interest [Line Items]      
Proceeds from noncontrolling interests 25,500,000    
Payments to noncontrolling interests 264,100,000    
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 64,800,000    
DaVinci Holdings Ltd.      
Redeemable Noncontrolling Interest [Line Items]      
Redemption of shares from redeemable noncontrolling interest $ 26,929,000 355,702,000  
DaVinci Holdings Ltd. | RenaissanceRe Holdings Ltd.      
Redeemable Noncontrolling Interest [Line Items]      
Payments to noncontrolling interests   69,400,000  
DaVinci Holdings Ltd. | DaVinci Holdings Ltd.      
Redeemable Noncontrolling Interest [Line Items]      
Payments to noncontrolling interests   355,600,000  
DaVinci Holdings Ltd. | Maximum      
Redeemable Noncontrolling Interest [Line Items]      
Share repurchase requests, limit 25.00%    
Medici      
Redeemable Noncontrolling Interest [Line Items]      
Sale of shares to redeemable noncontrolling interests $ 61,603,000 146,242,000  
Redemption of shares from redeemable noncontrolling interest $ 238,795,000 45,567,000  
Redemption provision, notice period 30 days    
Medici | Third-Party Investors      
Redeemable Noncontrolling Interest [Line Items]      
Sale of shares to redeemable noncontrolling interests $ 111,600,000 146,200,000  
Redemption of shares from redeemable noncontrolling interest 378,800,000 45,600,000  
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 140,000,000.0    
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 341,500,000    
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 129,155,000 100,000,000  
Redemption of shares from redeemable noncontrolling interest 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% 23.90% 25.40%
Medici      
Redeemable Noncontrolling Interest [Line Items]      
Noncontrolling ownership percentage 13.00% 11.40%  
Vermeer | Medici | Voting, Non-participating Shares      
Redeemable Noncontrolling Interest [Line Items]      
Parent company ownership in redeemable noncontrolling interest 100.00%    
Vermeer | PFZW | Participating, Non-voting Common Shares      
Redeemable Noncontrolling Interest [Line Items]      
Parent company ownership in redeemable noncontrolling interest 100.00%    
Fontana      
Redeemable Noncontrolling Interest [Line Items]      
Noncontrolling ownership percentage 28.70% 26.50%