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Noncontrolling Interests (Details) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Redeemable Noncontrolling Interest [Line Items]        
Redeemable noncontrolling interests $ 3,963,895,000   $ 3,554,053,000  
Net (income) loss attributable to redeemable noncontrolling interests (11,912,000) $ (46,850,000)    
DaVinci Reinsurance Ltd.        
Redeemable Noncontrolling Interest [Line Items]        
Sale of shares to redeemable noncontrolling interests, net of adjustments 102,900,000 40,000,000    
Third-Party Investors        
Redeemable Noncontrolling Interest [Line Items]        
Redemption of shares from redeemable noncontrolling interest $ 87,400,000 $ 156,700,000    
DaVinci Reinsurance Ltd.        
Redeemable Noncontrolling Interest [Line Items]        
Parent company ownership in redeemable noncontrolling interest 30.90% 28.70% 28.70%  
Medici        
Redeemable Noncontrolling Interest [Line Items]        
Parent company ownership in redeemable noncontrolling interest 13.60% 15.40%    
DaVinciRe Holdings Ltd.        
Redeemable Noncontrolling Interest [Line Items]        
Redeemable noncontrolling interests $ 1,775,503,000 $ 1,555,714,000 $ 1,499,451,000 $ 1,560,693,000
Net (income) loss attributable to redeemable noncontrolling interests (25,323,000) (39,934,000)    
Sale of shares to redeemable noncontrolling interests, net of adjustments 500,000,000 250,000,000    
Redemption of shares from redeemable noncontrolling interest 87,428,000 155,971,000    
DaVinciRe Holdings Ltd. | Third-Party Investors        
Redeemable Noncontrolling Interest [Line Items]        
Sale of shares to redeemable noncontrolling interests, net of adjustments 284,800,000 150,900,000    
DaVinciRe Holdings Ltd. | RenaissanceRe Holdings Ltd.        
Redeemable Noncontrolling Interest [Line Items]        
Sale of shares to redeemable noncontrolling interests, net of adjustments $ 215,200,000 99,100,000    
DaVinciRe Holdings Ltd. | Maximum        
Redeemable Noncontrolling Interest [Line Items]        
Share repurchase requests, limit 25.00%      
Medici        
Redeemable Noncontrolling Interest [Line Items]        
Redeemable noncontrolling interests $ 941,912,000 737,702,000 856,820,000 717,999,000
Net (income) loss attributable to redeemable noncontrolling interests (5,287,000) (13,443,000)    
Sale of shares to redeemable noncontrolling interests, net of adjustments 167,287,000 40,845,000    
Redemption of shares from redeemable noncontrolling interest $ 76,908,000 7,699,000    
Redemption provision, notice period 30 days      
Medici | Vermeer Reinsurance Ltd. | Voting, Non-participating Shares        
Redeemable Noncontrolling Interest [Line Items]        
Parent company ownership in redeemable noncontrolling interest 100.00%      
Vermeer Reinsurance Ltd.        
Redeemable Noncontrolling Interest [Line Items]        
Redeemable noncontrolling interests $ 1,246,480,000 1,116,154,000 $ 1,197,782,000 $ 1,109,627,000
Net (income) loss attributable to redeemable noncontrolling interests 18,698,000 6,527,000    
Sale of shares to redeemable noncontrolling interests, net of adjustments $ 30,000,000 $ 0    
PFZW | Vermeer Reinsurance Ltd. | Participating, Non-voting Common Shares        
Redeemable Noncontrolling Interest [Line Items]        
Parent company ownership in redeemable noncontrolling interest 100.00%