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VARIABLE INTEREST ENTITIES (Details)
 3 Months Ended 6 Months Ended
Jan. 10, 2023
USD ($)
note
Jun. 30, 2024
USD ($)
account
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
account
Jun. 30, 2023
USD ($)
Jun. 18, 2024
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Variable Interest Entity [Line Items]                    
Number of segregated accounts | account   4   4            
Assets   $ 51,567,589,000   $ 51,567,589,000       $ 49,007,105,000    
Liabilities   35,053,386,000   35,053,386,000       33,451,316,000    
Investments in other ventures, under equity method   151,608,000   151,608,000       112,624,000    
Redeemable noncontrolling interests   6,335,308,000   6,335,308,000       6,100,831,000    
Ceded premiums written   586,984,000 $ 455,818,000 1,378,095,000 $ 982,376,000          
Ceded premiums earned   435,876,000 399,474,000 868,906,000 816,612,000          
Vermeer                    
Variable Interest Entity [Line Items]                    
Redeemable noncontrolling interests   1,489,892,000 1,590,408,000 1,489,892,000 1,590,408,000   $ 1,433,268,000 1,555,297,000 $ 1,538,245,000 $ 1,490,840,000
Fontana                    
Variable Interest Entity [Line Items]                    
Redeemable noncontrolling interests   453,744,000 $ 277,886,000 453,744,000 277,886,000   $ 451,397,000 353,823,000 $ 276,859,000 $ 268,031,000
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd.                    
Variable Interest Entity [Line Items]                    
Assets   2,000,000,000.0   2,000,000,000.0       2,400,000,000    
Liabilities   2,000,000,000.0   2,000,000,000.0       2,400,000,000    
Net assets   56,800,000   56,800,000       74,200,000    
Variable Interest Entity, Primary Beneficiary | Vermeer                    
Variable Interest Entity [Line Items]                    
Assets   1,900,000,000   1,900,000,000       1,700,000,000    
Liabilities   374,400,000   374,400,000       102,700,000    
Redeemable noncontrolling interests   1,500,000,000   1,500,000,000       1,600,000,000    
Variable Interest Entity, Primary Beneficiary | Fontana                    
Variable Interest Entity [Line Items]                    
Assets   1,800,000,000   1,800,000,000       1,500,000,000    
Liabilities   1,200,000,000   1,200,000,000       1,000,000,000.0    
Redeemable noncontrolling interests   453,700,000   453,700,000       353,800,000    
Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd. | Upsilon RFO Re Ltd.                    
Variable Interest Entity [Line Items]                    
Payments of capital distribution       $ 33,000,000.0 $ 62,300,000          
Variable interest entity, ownership percentage       12.50% 13.10%          
Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd. | Upsilon RFO Re Ltd. | Preference shares                    
Variable Interest Entity [Line Items]                    
Investment in variable interest entity         $ 10,200,000          
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       $ 190,600,000 489,600,000          
Net assets   409,000,000.0   409,000,000.0       500,000,000.0    
Variable Interest Entity, Primary Beneficiary | Third Party Investor | Upsilon RFO Re Ltd. | Preference shares                    
Variable Interest Entity [Line Items]                    
Investment in variable interest entity         39,800,000          
Variable Interest Entity, Not Primary Beneficiary | Upsilon Diversified                    
Variable Interest Entity [Line Items]                    
Investments in other ventures, under equity method   600,000   600,000       800,000    
Variable Interest Entity, Not Primary Beneficiary | NOC1                    
Variable Interest Entity [Line Items]                    
Investments in other ventures, under equity method   2,000,000.0   2,000,000.0       1,700,000    
Variable Interest Entity, Not Primary Beneficiary | AlphaCat Managers Ltd                    
Variable Interest Entity [Line Items]                    
Investments in other ventures, under equity method   5,100,000   5,100,000       4,400,000    
Variable Interest Entity, Not Primary Beneficiary | Upsilon Diversified                    
Variable Interest Entity [Line Items]                    
Assets   416,800,000   416,800,000       600,800,000    
Liabilities   18,300,000   18,300,000       108,000,000.0    
Variable Interest Entity, Not Primary Beneficiary | Upsilon Diversified | Upsilon RFO Re Ltd.                    
Variable Interest Entity [Line Items]                    
Investment owned, fair value   409,100,000   409,100,000       503,100,000    
Variable Interest Entity, Not Primary Beneficiary | NOC1                    
Variable Interest Entity [Line Items]                    
Assets   204,200,000   204,200,000       196,500,000    
Liabilities   49,200,000   49,200,000       22,800,000    
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re                    
Variable Interest Entity [Line Items]                    
Assets   615,200,000   615,200,000       436,900,000    
Liabilities   615,200,000   615,200,000       436,900,000    
Number of notes issued | note 2                  
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re | Term Loans                    
Variable Interest Entity [Line Items]                    
Investment in participating notes   3,400,000   3,400,000       2,200,000    
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re | One Hundred Fifty Million Principal At Risk Variable Rate Note                    
Variable Interest Entity [Line Items]                    
Face amount           $ 150,000,000        
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re | Eighty Five Million Principal At Risk Variable Rate Note                    
Variable Interest Entity [Line Items]                    
Face amount $ 85,000,000                  
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re | One Hundred Million Principal At Risk Variable Rate Note                    
Variable Interest Entity [Line Items]                    
Face amount $ 100,000,000                  
Variable Interest Entity, Not Primary Beneficiary | Tailwind Re Ltd                    
Variable Interest Entity [Line Items]                    
Assets   418,600,000   418,600,000       417,100,000    
Liabilities   418,600,000   418,600,000       417,100,000    
Variable Interest Entity, Not Primary Beneficiary | Tailwind Re Ltd | Term Loans                    
Variable Interest Entity [Line Items]                    
Investment in participating notes   0   0       800,000    
Variable Interest Entity, Not Primary Beneficiary | AlphaCat Managers Ltd                    
Variable Interest Entity [Line Items]                    
Assets   4,300,000,000   4,300,000,000       5,000,000,000.0    
Liabilities   2,000,000,000.0   2,000,000,000.0       2,400,000,000    
Variable Interest Entity, Not Primary Beneficiary | Investors Of Upsilon RFO Diversified IV | Upsilon RFO Re Ltd.                    
Variable Interest Entity [Line Items]                    
Net assets   $ 111,000,000.0   111,000,000.0       $ 88,300,000    
Variable Interest Entity, Not Primary Beneficiary | Third Party Investor | Upsilon Diversified                    
Variable Interest Entity [Line Items]                    
Payments of capital distribution       165,100,000 420,800,000          
Variable Interest Entity, Not Primary Beneficiary | Third Party Investor | Upsilon Diversified | Preference shares                    
Variable Interest Entity [Line Items]                    
Investment in variable interest entity       16,900,000 30,000,000.0          
Variable Interest Entity, Not Primary Beneficiary | Third Party Investor | NOC1 | Preference shares                    
Variable Interest Entity [Line Items]                    
Investment in variable interest entity       20,000,000.0            
Variable Interest Entity, Not Primary Beneficiary | Renaissance Reinsurance Ltd. | Mona Lisa Re                    
Variable Interest Entity [Line Items]                    
Ceded premiums written       31,200,000 18,300,000          
Ceded premiums earned       17,000,000.0 16,000,000.0          
Variable Interest Entity, Not Primary Beneficiary | DaVinci Reinsurance Ltd. | Mona Lisa Re                    
Variable Interest Entity [Line Items]                    
Ceded premiums written       7,800,000 4,600,000          
Ceded premiums earned       4,200,000 $ 4,000,000.0          
Variable Interest Entity, Not Primary Beneficiary | Validus Acquisition | Tailwind Re Ltd                    
Variable Interest Entity [Line Items]                    
Ceded premiums written       42,700,000            
Ceded premiums earned       $ 21,200,000