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NONCONTROLLING INTERESTS - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Third-Party Investors      
Redeemable Noncontrolling Interest [Line Items]      
Redemption of shares from redeemable noncontrolling interest $ 50,200,000 $ 87,400,000  
DaVinci Reinsurance Ltd.      
Redeemable Noncontrolling Interest [Line Items]      
Sale of shares to redeemable noncontrolling interests, net of adjustments 275,000,000 $ 102,900,000  
DavinciRe Third-Party Investors      
Redeemable Noncontrolling Interest [Line Items]      
Proceeds from noncontrolling interests 0    
Payments to noncontrolling interests 45,200,000    
Medici      
Redeemable Noncontrolling Interest [Line Items]      
Proceeds from noncontrolling interests 253,300,000    
Payments to noncontrolling interests $ 17,600,000    
DaVinci Reinsurance Ltd.      
Redeemable Noncontrolling Interest [Line Items]      
Parent company ownership in redeemable noncontrolling interest 25.40% 30.90% 30.90%
Medici      
Redeemable Noncontrolling Interest [Line Items]      
Parent company ownership in redeemable noncontrolling interest 10.80% 13.60%  
Fontana      
Redeemable Noncontrolling Interest [Line Items]      
Parent company ownership in redeemable noncontrolling interest 31.60%    
DaVinciRe Holdings Ltd.      
Redeemable Noncontrolling Interest [Line Items]      
Sale of shares to redeemable noncontrolling interests, net of adjustments $ 250,000,000 $ 500,000,000  
Redemption of shares from redeemable noncontrolling interest 50,175,000 87,428,000  
DaVinciRe Holdings Ltd. | Third-Party Investors      
Redeemable Noncontrolling Interest [Line Items]      
Sale of shares to redeemable noncontrolling interests, net of adjustments 102,200,000 284,800,000  
DaVinciRe Holdings Ltd. | RenaissanceRe Holdings Ltd.      
Redeemable Noncontrolling Interest [Line Items]      
Sale of shares to redeemable noncontrolling interests, net of adjustments $ 147,800,000 215,200,000  
DaVinciRe 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, net of adjustments $ 244,102,000 167,287,000  
Redemption of shares from redeemable noncontrolling interest $ 17,648,000 76,908,000  
Redemption provision, notice period 30 days    
Medici | Third-Party Investors      
Redeemable Noncontrolling Interest [Line Items]      
Sale of shares to redeemable noncontrolling interests, net of adjustments $ 244,100,000    
Medici | RenaissanceRe Holdings Ltd.      
Redeemable Noncontrolling Interest [Line Items]      
Sale of shares to redeemable noncontrolling interests, net of adjustments $ 100,000    
Medici | Vermeer Reinsurance Ltd. | Voting, Non-participating Shares      
Redeemable Noncontrolling Interest [Line Items]      
Parent company ownership in redeemable noncontrolling interest 100.00%    
PFZW | Vermeer Reinsurance Ltd. | Participating, Non-voting Common Shares      
Redeemable Noncontrolling Interest [Line Items]      
Parent company ownership in redeemable noncontrolling interest 100.00%    
Vermeer Reinsurance Ltd.      
Redeemable Noncontrolling Interest [Line Items]      
Sale of shares to redeemable noncontrolling interests, net of adjustments $ 0 30,000,000  
Fontana      
Redeemable Noncontrolling Interest [Line Items]      
Sale of shares to redeemable noncontrolling interests, net of adjustments $ 0 $ 0