v3.26.3
NONCONTROLLING INTERESTS - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Redeemable Noncontrolling Interest [Line Items]          
Assets $ 54,831,196,000   $ 54,831,196,000   $ 53,800,390,000
Liabilities 36,044,895,000   36,044,895,000   34,589,641,000
Investments 36,191,038,000   36,191,038,000   36,073,209,000
Other assets 452,618,000   452,618,000   328,087,000
Reserve for claims and claim expenses 22,294,195,000 $ 22,712,860,000 22,294,195,000 $ 22,712,860,000 22,302,345,000
Debt 2,331,768,000   2,331,768,000   2,329,201,000
Other liabilities $ 662,632,000   662,632,000   $ 856,302,000
Fontana Third Party Investors          
Redeemable Noncontrolling Interest [Line Items]          
Redemption of shares from redeemable noncontrolling interest       72,000,000.0  
Payments to noncontrolling interests       72,000,000.0  
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]          
Redemption of shares from redeemable noncontrolling interest     23,400,000    
Sale of shares to redeemable noncontrolling interest, net of adjustments     $ 20,500,000 356,500,000  
RenaissanceRe Medici UCITS Fund | RenaissanceRe Holdings Ltd.          
Redeemable Noncontrolling Interest [Line Items]          
Sale of shares to redeemable noncontrolling interest, net of adjustments       140,000,000.0  
Variable Interest Entity, Primary Beneficiary | DaVinciRe Holdings Ltd.          
Redeemable Noncontrolling Interest [Line Items]          
Noncontrolling ownership percentage 26.30%   26.30%   24.30%
Variable Interest Entity, Primary Beneficiary | Medici          
Redeemable Noncontrolling Interest [Line Items]          
Noncontrolling ownership percentage 11.60%   11.60%   11.30%
Variable Interest Entity, Primary Beneficiary | Fontana          
Redeemable Noncontrolling Interest [Line Items]          
Noncontrolling ownership percentage 38.40%   38.40%   28.70%
Variable Interest Entity, Primary Beneficiary | Third-Party Investors          
Redeemable Noncontrolling Interest [Line Items]          
Redemption of shares from redeemable noncontrolling interest     $ 81,300,000 26,900,000  
Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd.          
Redeemable Noncontrolling Interest [Line Items]          
Proceeds from noncontrolling interests       121,600,000  
Payments to noncontrolling interests       367,700,000  
Variable Interest Entity, Primary Beneficiary | DaVinciRe Holdings Ltd.          
Redeemable Noncontrolling Interest [Line Items]          
Proceeds from noncontrolling interests     0    
Sale of shares to redeemable noncontrolling interest, net of adjustments       69,700,000  
Variable Interest Entity, Primary Beneficiary | DaVinci Holdings Ltd.          
Redeemable Noncontrolling Interest [Line Items]          
Proceeds from noncontrolling interests       0  
Payments to noncontrolling interests     648,800,000 26,900,000  
Variable Interest Entity, Primary Beneficiary | Medici          
Redeemable Noncontrolling Interest [Line Items]          
Proceeds from noncontrolling interests     10,600,000    
Payments to noncontrolling interests     77,100,000    
Variable Interest Entity, Primary Beneficiary | Fontana Third Party Investors          
Redeemable Noncontrolling Interest [Line Items]          
Redemption of shares from redeemable noncontrolling interest     79,300,000    
Proceeds from noncontrolling interests     0 0  
Payments to noncontrolling interests     140,900,000    
Sale of shares to redeemable noncontrolling interest, net of adjustments       100,000,000.0  
Variable Interest Entity, Primary Beneficiary | DaVinciRe Holdings Ltd.          
Redeemable Noncontrolling Interest [Line Items]          
Redemption of shares from redeemable noncontrolling interest $ 0 0 649,164,000 26,929,000  
Assets 7,200,000,000   7,200,000,000   $ 7,200,000,000
Liabilities 2,500,000,000   2,500,000,000   2,300,000,000
Investments 6,000,000,000.0   6,000,000,000.0   6,200,000,000
Other assets 1,200,000,000   1,200,000,000   978,500,000
Reserve for claims and claim expenses 1,200,000,000   1,200,000,000   1,500,000,000
Debt 297,200,000   297,200,000   297,000,000.0
Other liabilities 1,000,000,000.0   1,000,000,000.0   554,800,000
Sale of shares to redeemable noncontrolling interest, net of adjustments 0 0 0 70,000,000  
Variable Interest Entity, Primary Beneficiary | DaVinciRe Holdings Ltd. | Third-Party Investors          
Redeemable Noncontrolling Interest [Line Items]          
Redemption of shares from redeemable noncontrolling interest     750,000,000.0    
Variable Interest Entity, Primary Beneficiary | DaVinciRe Holdings Ltd. | RenaissanceRe Holdings Ltd.          
Redeemable Noncontrolling Interest [Line Items]          
Redemption of shares from redeemable noncontrolling interest     182,500,000    
Variable Interest Entity, Primary Beneficiary | Vermeer          
Redeemable Noncontrolling Interest [Line Items]          
Assets 2,400,000,000   2,400,000,000   2,300,000,000
Liabilities 423,000,000.0   423,000,000.0   411,400,000
Investments 2,000,000,000.0   2,000,000,000.0   2,000,000,000.0
Other assets 363,600,000   363,600,000   332,700,000
Reserve for claims and claim expenses 63,700,000   63,700,000   91,200,000
Other liabilities 359,300,000   359,300,000   320,200,000
Sale of shares to redeemable noncontrolling interest, net of adjustments     0 0  
Variable Interest Entity, Primary Beneficiary | Vermeer | PFZW          
Redeemable Noncontrolling Interest [Line Items]          
Payments of dividends     150,000,000.0 0  
Variable Interest Entity, Primary Beneficiary | Medici          
Redeemable Noncontrolling Interest [Line Items]          
Redemption of shares from redeemable noncontrolling interest 1,338,000 7,143,000 47,274,000 302,672,000  
Assets 1,700,000,000   1,700,000,000   1,700,000,000
Liabilities 10,800,000   10,800,000   133,200,000
Investments 1,700,000,000   1,700,000,000   1,700,000,000
Other assets 22,700,000   22,700,000   23,300,000
Other liabilities 10,800,000   10,800,000   133,200,000
Sale of shares to redeemable noncontrolling interest, net of adjustments 2,600,000 17,895,000 $ 48,600,000 160,827,000  
Redemption provision, notice period     30 days    
Variable Interest Entity, Primary Beneficiary | Medici | Revolving Credit Facility          
Redeemable Noncontrolling Interest [Line Items]          
Maximum borrowing capacity $ 75,000,000.0   $ 75,000,000.0    
Variable Interest Entity, Primary Beneficiary | Medici | Vermeer | Voting, Non-participating Shares          
Redeemable Noncontrolling Interest [Line Items]          
Parent company ownership in redeemable noncontrolling interest 100.00%   100.00%    
Variable Interest Entity, Primary Beneficiary | Medici | Third-Party Investors          
Redeemable Noncontrolling Interest [Line Items]          
Redemption of shares from redeemable noncontrolling interest     $ 197,300,000 502,700,000  
Sale of shares to redeemable noncontrolling interest, net of adjustments     198,600,000 210,800,000  
Payments of dividends       15,300,000  
Variable Interest Entity, Primary Beneficiary | Medici | RenaissanceRe Holdings Ltd.          
Redeemable Noncontrolling Interest [Line Items]          
Redemption of shares from redeemable noncontrolling interest     150,000,000.0    
Sale of shares to redeemable noncontrolling interest, net of adjustments     $ 150,000,000.0 50,200,000  
Variable Interest Entity, Primary Beneficiary | RenaissanceRe Medici UCITS Fund          
Redeemable Noncontrolling Interest [Line Items]          
Transfer in kind from existing investors       316,500,000  
Variable Interest Entity, Primary Beneficiary | RenaissanceRe Medici UCITS Fund | RenaissanceRe Holdings Ltd.          
Redeemable Noncontrolling Interest [Line Items]          
Sale of shares to redeemable noncontrolling interest, net of adjustments       200,000,000.0  
Variable Interest Entity, Primary Beneficiary | PFZW | Vermeer | Participating, Non-voting Common Shares          
Redeemable Noncontrolling Interest [Line Items]          
Parent company ownership in redeemable noncontrolling interest 100.00%   100.00%    
Variable Interest Entity, Primary Beneficiary | Fontana          
Redeemable Noncontrolling Interest [Line Items]          
Return of limited partner interest     $ 100,000,000.0    
Redemption of shares from redeemable noncontrolling interest $ 61,555,000 0 140,892,000 72,044,000  
Assets 3,100,000,000   3,100,000,000   2,900,000,000
Liabilities 2,400,000,000   2,400,000,000   2,100,000,000
Investments 2,200,000,000   2,200,000,000   2,000,000,000.0
Other assets 865,200,000   865,200,000   889,000,000.0
Reserve for claims and claim expenses 1,600,000,000   1,600,000,000   1,400,000,000
Debt 99,300,000   99,300,000   99,200,000
Other liabilities 660,700,000   660,700,000   $ 620,600,000
Sale of shares to redeemable noncontrolling interest, net of adjustments $ 0 $ 0 0 129,155,000  
Variable Interest Entity, Primary Beneficiary | Fontana | Third-Party Investors          
Redeemable Noncontrolling Interest [Line Items]          
Sale of shares to redeemable noncontrolling interest, net of adjustments       100,000,000.0  
Variable Interest Entity, Primary Beneficiary | Fontana | RenaissanceRe Holdings Ltd.          
Redeemable Noncontrolling Interest [Line Items]          
Return of limited partner interest     $ 38,400,000    
Sale of shares to redeemable noncontrolling interest, net of adjustments       $ 70,800,000  
Variable Interest Entity, Primary Beneficiary | Maximum | DaVinciRe Holdings Ltd.          
Redeemable Noncontrolling Interest [Line Items]          
Share repurchase requests, limit 25.00%   25.00%