v3.25.4
NONCONTROLLING INTERESTS - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 18, 2025
Dec. 31, 2023
Redeemable Noncontrolling Interest [Line Items]        
Assets $ 53,800,390,000 $ 50,707,550,000    
Liabilities 34,589,641,000 33,155,789,000    
Investments 36,073,209,000 32,639,456,000    
Other assets 328,087,000 444,037,000    
Reserve for claims and claim expenses 22,302,345,000 21,303,491,000   $ 20,486,869,000
Debt 2,329,201,000 1,886,689,000    
Other liabilities 856,302,000 1,060,129,000    
Medici | Revolving Credit Facility        
Redeemable Noncontrolling Interest [Line Items]        
Line of credit facility, maximum borrowing capacity     $ 75,000,000  
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 limited partner interest to redeemable noncontrolling interest 399,000,000.0      
Primary Beneficiary | DaVinci        
Redeemable Noncontrolling Interest [Line Items]        
Sale of limited partner interest to redeemable noncontrolling interest 69,700,000 300,000,000.0    
Proceeds from noncontrolling interests 0      
Primary Beneficiary | Third-Party Investors        
Redeemable Noncontrolling Interest [Line Items]        
Redemption of shares from redeemable noncontrolling interests 26,900,000 225,900,000    
Primary Beneficiary | DaVinci        
Redeemable Noncontrolling Interest [Line Items]        
Proceeds from noncontrolling interests   69,700,000    
Payments to noncontrolling interests 26,900,000 225,900,000    
Primary Beneficiary | Medici        
Redeemable Noncontrolling Interest [Line Items]        
Proceeds from noncontrolling interests 212,200,000 163,600,000    
Payments to noncontrolling interests 639,900,000 361,800,000    
Primary Beneficiary | Fontana        
Redeemable Noncontrolling Interest [Line Items]        
Sale of limited partner interest to redeemable noncontrolling interest 100,000,000.0 50,000,000.0    
Redemption of shares from redeemable noncontrolling interests 72,000,000.0      
Proceeds from noncontrolling interests 0 $ 129,200,000    
Payments to noncontrolling interests $ 72,000,000.0      
Primary Beneficiary | DaVinci        
Redeemable Noncontrolling Interest [Line Items]        
Noncontrolling ownership percentage 24.30% 25.40%    
Primary Beneficiary | Medici        
Redeemable Noncontrolling Interest [Line Items]        
Noncontrolling ownership percentage 11.30% 15.80%    
Primary Beneficiary | Fontana        
Redeemable Noncontrolling Interest [Line Items]        
Noncontrolling ownership percentage 28.70% 26.50%    
Primary Beneficiary | DaVinci        
Redeemable Noncontrolling Interest [Line Items]        
Sale of limited partner interest to redeemable noncontrolling interest $ 70,007,000 $ 300,020,000    
Redemption of shares from redeemable noncontrolling interests 26,929,000 406,849,000    
Assets 7,200,000,000 6,100,000,000    
Liabilities 2,300,000,000 2,000,000,000.0    
Investments 6,200,000,000 5,300,000,000    
Other assets 978,500,000 805,400,000    
Reserve for claims and claim expenses 1,500,000,000 1,400,000,000    
Debt 297,000,000.0 149,900,000    
Other liabilities 554,800,000 440,700,000    
Primary Beneficiary | DaVinci | Third-Party Investors        
Redeemable Noncontrolling Interest [Line Items]        
Payments to noncontrolling interests   180,600,000    
Primary Beneficiary | DaVinci | RenaissanceRe Holdings Ltd.        
Redeemable Noncontrolling Interest [Line Items]        
Payments to noncontrolling interests   69,400,000    
Primary Beneficiary | Medici        
Redeemable Noncontrolling Interest [Line Items]        
Sale of limited partner interest to redeemable noncontrolling interest 208,451,000 200,219,000    
Redemption of shares from redeemable noncontrolling interests 604,392,000 406,644,000    
Assets 1,700,000,000 2,100,000,000    
Liabilities 133,200,000 151,100,000    
Investments 1,700,000,000 2,100,000,000    
Other assets 23,300,000 26,700,000    
Other liabilities $ 133,200,000 151,100,000    
Written notice period for redemption 30 days      
Primary Beneficiary | Medici | Revolving Credit Facility        
Redeemable Noncontrolling Interest [Line Items]        
Line of credit facility, maximum borrowing capacity     $ 75,000,000  
Primary Beneficiary | Medici | Third-Party Investors        
Redeemable Noncontrolling Interest [Line Items]        
Sale of limited partner interest to redeemable noncontrolling interest $ 258,500,000 250,200,000    
Redemption of shares from redeemable noncontrolling interests 804,400,000 382,000,000.0    
Other liabilities 43,000,000.0      
Payments of dividends 15,300,000 24,600,000    
Primary Beneficiary | Medici | RenaissanceRe Holdings Ltd.        
Redeemable Noncontrolling Interest [Line Items]        
Sale of limited partner interest to redeemable noncontrolling interest 50,200,000 50,600,000    
Redemption of shares from redeemable noncontrolling interests $ 200,000,000.0 300,000    
Primary Beneficiary | Medici | Vermeer | Voting, Non-participating Shares        
Redeemable Noncontrolling Interest [Line Items]        
Parent company ownership in redeemable noncontrolling interest 100.00%      
Primary Beneficiary | RenaissanceRe Medici UCITS Fund        
Redeemable Noncontrolling Interest [Line Items]        
Transfer in kind from existing investors $ 316,500,000      
Primary Beneficiary | RenaissanceRe Medici UCITS Fund | RenaissanceRe Holdings Ltd.        
Redeemable Noncontrolling Interest [Line Items]        
Sale of limited partner interest to redeemable noncontrolling interest 140,000,000.0      
Primary Beneficiary | Stratos        
Redeemable Noncontrolling Interest [Line Items]        
Transfer in kind from existing investors 260,400,000      
Primary Beneficiary | Vermeer        
Redeemable Noncontrolling Interest [Line Items]        
Sale of limited partner interest to redeemable noncontrolling interest 0 175,000,000    
Assets 2,300,000,000 1,900,000,000    
Liabilities 411,400,000 93,000,000.0    
Investments 2,000,000,000.0 1,800,000,000    
Other assets 332,700,000 68,500,000    
Reserve for claims and claim expenses 91,200,000 34,700,000    
Other liabilities 320,200,000 58,400,000    
Primary Beneficiary | Vermeer | Stichting Pensioenfonds Zorg en Welzijn        
Redeemable Noncontrolling Interest [Line Items]        
Payments of dividends $ 0 175,000,000.0    
Primary Beneficiary | PFZW | Vermeer | Participating, Non-voting Common Shares        
Redeemable Noncontrolling Interest [Line Items]        
Parent company ownership in redeemable noncontrolling interest 100.00%      
Primary Beneficiary | Fontana        
Redeemable Noncontrolling Interest [Line Items]        
Sale of limited partner interest to redeemable noncontrolling interest $ 129,155,000 100,000,000    
Redemption of shares from redeemable noncontrolling interests 72,044,000 0    
Assets 2,900,000,000 2,200,000,000    
Liabilities 2,100,000,000 1,600,000,000    
Investments 2,000,000,000.0 1,300,000,000    
Other assets 889,000,000.0 943,000,000.0    
Reserve for claims and claim expenses 1,400,000,000 913,100,000    
Debt 99,200,000    
Other liabilities 620,600,000 679,600,000    
Primary Beneficiary | Fontana | Third-Party Investors        
Redeemable Noncontrolling Interest [Line Items]        
Sale of limited partner interest to redeemable noncontrolling interest 100,000,000.0 100,000,000.0    
Primary Beneficiary | Fontana | RenaissanceRe Holdings Ltd.        
Redeemable Noncontrolling Interest [Line Items]        
Sale of limited partner interest to redeemable noncontrolling interest $ 70,800,000 $ 50,000,000.0    
Primary Beneficiary | Maximum | DaVinci        
Redeemable Noncontrolling Interest [Line Items]        
Share repurchase requests, limit 25.00%