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VARIABLE INTEREST ENTITIES (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
account
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
account
Jun. 30, 2024
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Variable Interest Entity [Line Items]                
Number of segregated accounts | account 4   4          
Assets $ 54,727,523   $ 54,727,523     $ 50,707,550    
Liabilities 36,884,722   36,884,722     33,155,789    
Investments in other ventures, under equity method 112,580   112,580     102,770    
Redeemable noncontrolling interests 7,043,107   7,043,107     6,977,749    
Ceded premiums written 650,910 $ 586,984 1,362,884 $ 1,378,095        
Ceded premiums earned 449,130 435,876 835,570 868,906        
Vermeer                
Variable Interest Entity [Line Items]                
Redeemable noncontrolling interests 1,750,202 1,489,892 1,750,202 1,489,892 $ 1,692,777 1,799,857 $ 1,433,268 $ 1,555,297
Fontana                
Variable Interest Entity [Line Items]                
Redeemable noncontrolling interests 549,124 $ 453,744 549,124 453,744 $ 535,656 469,439 $ 451,397 $ 353,823
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd.                
Variable Interest Entity [Line Items]                
Assets 1,300,000   1,300,000     1,900,000    
Liabilities 1,300,000   1,300,000     1,900,000    
Net assets 34,800   34,800     60,500    
Variable Interest Entity, Primary Beneficiary | Vermeer                
Variable Interest Entity [Line Items]                
Assets 2,200,000   2,200,000     1,900,000    
Liabilities 477,300   477,300     93,000    
Redeemable noncontrolling interests 1,800,000   1,800,000     1,800,000    
Variable Interest Entity, Primary Beneficiary | Fontana                
Variable Interest Entity [Line Items]                
Assets 2,600,000   2,600,000     2,200,000    
Liabilities 1,800,000   1,800,000     1,600,000    
Redeemable noncontrolling interests 549,100   549,100     469,400    
Variable Interest Entity, Primary Beneficiary | Investors Of Upsilon RFO Diversified I, II and III | Upsilon RFO Re Ltd.                
Variable Interest Entity [Line Items]                
Payments of capital distribution     191,700 190,600        
Net assets 253,600   253,600     282,200    
Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd. | Upsilon RFO Re Ltd.                
Variable Interest Entity [Line Items]                
Payments of capital distribution     $ 23,600 $ 33,000        
Variable interest entity, ownership percentage     12.60% 12.50%        
Variable Interest Entity, Primary Beneficiary | Investors Of Upsilon RFO Diversified IV | Upsilon RFO Re Ltd.                
Variable Interest Entity [Line Items]                
Payments of capital distribution     $ 21,900          
Variable Interest Entity, Not Primary Beneficiary | Upsilon Diversified                
Variable Interest Entity [Line Items]                
Investments in other ventures, under equity method 400   400     500    
Variable Interest Entity, Not Primary Beneficiary | NOC1                
Variable Interest Entity [Line Items]                
Investments in other ventures, under equity method 1,800   1,800     1,700    
Variable Interest Entity, Not Primary Beneficiary | AlphaCat Managers Ltd                
Variable Interest Entity [Line Items]                
Investments in other ventures, under equity method 3,200   3,200     3,600    
Variable Interest Entity, Not Primary Beneficiary | Upsilon Diversified                
Variable Interest Entity [Line Items]                
Assets 307,400   307,400     440,600    
Liabilities 79,300   79,300     140,900    
Variable Interest Entity, Not Primary Beneficiary | Upsilon Diversified | Upsilon RFO Re Ltd.                
Variable Interest Entity [Line Items]                
Investment owned, fair value 231,400   231,400     304,000    
Variable Interest Entity, Not Primary Beneficiary | NOC1                
Variable Interest Entity [Line Items]                
Assets 178,200   178,200     173,400    
Liabilities 400   400     2,200    
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re                
Variable Interest Entity [Line Items]                
Assets 975,000   975,000     936,100    
Liabilities 975,000   975,000     936,100    
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re | Term Loans                
Variable Interest Entity [Line Items]                
Investment in participating notes 4,300   4,300     7,000    
Variable Interest Entity, Not Primary Beneficiary | Tailwind Re Ltd                
Variable Interest Entity [Line Items]                
Assets 100   100     416,800    
Liabilities 100   100     416,800    
Variable Interest Entity, Not Primary Beneficiary | AlphaCat Managers Ltd                
Variable Interest Entity [Line Items]                
Assets 1,500,000   1,500,000     3,000,000    
Liabilities 900,000   900,000     1,300,000    
Variable Interest Entity, Not Primary Beneficiary | RenaissanceRe Holdings Ltd. | Upsilon Diversified                
Variable Interest Entity [Line Items]                
Payments of capital distribution     200          
Variable Interest Entity, Not Primary Beneficiary | RenaissanceRe Holdings Ltd. | Tailwind Re Ltd                
Variable Interest Entity [Line Items]                
Ceded premiums written       $ 42,700        
Ceded premiums earned       21,200        
Variable Interest Entity, Not Primary Beneficiary | Investors Of Upsilon RFO Diversified IV | Upsilon RFO Re Ltd.                
Variable Interest Entity [Line Items]                
Net assets $ 108,000   108,000     $ 115,900    
Variable Interest Entity, Not Primary Beneficiary | Third Party Investor | Upsilon Diversified                
Variable Interest Entity [Line Items]                
Payments of capital distribution     177,400 165,100        
Variable Interest Entity, Not Primary Beneficiary | Third Party Investor | Upsilon Diversified | Preference shares                
Variable Interest Entity [Line Items]                
Investment in variable interest entity     17,500 16,900        
Variable Interest Entity, Not Primary Beneficiary | Third Party Investor | NOC1 | Preference shares                
Variable Interest Entity [Line Items]                
Investment in variable interest entity       20,000        
Variable Interest Entity, Not Primary Beneficiary | Renaissance Reinsurance Ltd. | Mona Lisa Re                
Variable Interest Entity [Line Items]                
Ceded premiums written     57,500 31,200        
Ceded premiums earned     35,700 17,000        
Variable Interest Entity, Not Primary Beneficiary | DaVinci Reinsurance Ltd. | Mona Lisa Re                
Variable Interest Entity [Line Items]                
Ceded premiums written     14,300 7,800        
Ceded premiums earned     $ 8,900 $ 4,200