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VARIABLE INTEREST ENTITIES (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Jan. 10, 2023
USD ($)
note
Jul. 26, 2023
USD ($)
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Variable Interest Entity [Line Items]                    
Assets     $ 41,399,915,000     $ 41,399,915,000   $ 36,552,878,000    
Liabilities     28,320,840,000     28,320,840,000   26,692,215,000    
Investments in other ventures, under equity method     89,505,000     89,505,000   79,750,000    
Redeemable noncontrolling interests     5,676,262,000     5,676,262,000   4,535,389,000    
Ceded premiums written     455,818,000   $ 601,023,000 982,376,000 $ 1,378,770,000      
Ceded premiums earned     399,474,000   432,440,000 816,612,000 879,044,000      
Vermeer Reinsurance Ltd.                    
Variable Interest Entity [Line Items]                    
Redeemable noncontrolling interests     1,590,408,000 $ 1,538,245,000 1,269,417,000 1,590,408,000 1,269,417,000 1,490,840,000 $ 1,246,480,000 $ 1,197,782,000
Fontana                    
Variable Interest Entity [Line Items]                    
Redeemable noncontrolling interests     277,886,000 276,859,000 $ 268,143,000 277,886,000 268,143,000 268,031,000 $ 0 $ 0
Variable Interest Entity, Primary Beneficiary | Upsilon Diversified                    
Variable Interest Entity [Line Items]                    
Investments in other ventures, under equity method     1,400,000     1,400,000   1,900,000    
Variable Interest Entity, Primary Beneficiary | NOC1                    
Variable Interest Entity [Line Items]                    
Investments in other ventures, under equity method     1,500,000     1,500,000        
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd.                    
Variable Interest Entity [Line Items]                    
Assets     3,000,000,000     3,000,000,000   3,700,000,000    
Liabilities     3,000,000,000     3,000,000,000   3,700,000,000    
Net assets     133,200,000     133,200,000   165,300,000    
Variable Interest Entity, Primary Beneficiary | Upsilon Diversified                    
Variable Interest Entity [Line Items]                    
Assets     956,300,000     956,300,000   1,200,000,000    
Liabilities     78,800,000     78,800,000   32,100,000    
Variable Interest Entity, Primary Beneficiary | Upsilon Diversified | Upsilon RFO Re Ltd.                    
Variable Interest Entity [Line Items]                    
Investment owned, fair value     952,400,000     952,400,000   1,200,000,000    
Variable Interest Entity, Primary Beneficiary | NOC1                    
Variable Interest Entity [Line Items]                    
Assets     153,100,000     153,100,000        
Liabilities     200,000     200,000        
Variable Interest Entity, Primary Beneficiary | Vermeer Reinsurance Ltd.                    
Variable Interest Entity [Line Items]                    
Assets     2,000,000,000     2,000,000,000   1,600,000,000    
Liabilities     388,700,000     388,700,000   144,900,000    
Redeemable noncontrolling interests     1,600,000,000     1,600,000,000   1,500,000,000    
Variable Interest Entity, Primary Beneficiary | Fontana                    
Variable Interest Entity [Line Items]                    
Assets     1,100,000,000     1,100,000,000   711,000,000    
Liabilities     733,800,000     733,800,000   319,200,000    
Redeemable noncontrolling interests     277,900,000     277,900,000   268,000,000    
Variable Interest Entity, Primary Beneficiary | Third Party Investor | Upsilon RFO Re Ltd.                    
Variable Interest Entity [Line Items]                    
Payments of capital distribution           489,600,000 188,100,000      
Net assets     900,000,000     900,000,000   1,200,000,000    
Variable Interest Entity, Primary Beneficiary | Third Party Investor | Upsilon RFO Re Ltd. | Preference shares                    
Variable Interest Entity [Line Items]                    
Contributions to subsidiaries           39,800,000 89,000,000.0      
Variable Interest Entity, Primary Beneficiary | Third Party Investor | Upsilon Diversified                    
Variable Interest Entity [Line Items]                    
Payments of capital distribution           420,800,000 143,500,000      
Variable Interest Entity, Primary Beneficiary | Third Party Investor | Upsilon Diversified | Preference shares                    
Variable Interest Entity [Line Items]                    
Contributions to subsidiaries           30,000,000.0 $ 82,500,000      
Variable Interest Entity, Primary Beneficiary | Third Party Investor | NOC1 | Preference shares                    
Variable Interest Entity [Line Items]                    
Contributions to subsidiaries           151,500,000        
Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd. | Upsilon RFO Re Ltd.                    
Variable Interest Entity [Line Items]                    
Payments of capital distribution           $ 62,300,000        
Variable interest entity, ownership percentage           13.10% 12.70%      
Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd. | Upsilon RFO Re Ltd. | Preference shares                    
Variable Interest Entity [Line Items]                    
Contributions to subsidiaries           $ 10,200,000 $ 10,000,000.0      
Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd. | Upsilon Diversified                    
Variable Interest Entity [Line Items]                    
Payments of capital distribution           700,000 0      
Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd. | Upsilon Diversified | Preference shares                    
Variable Interest Entity [Line Items]                    
Contributions to subsidiaries           100,000 0      
Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd. | NOC1 | Preference shares                    
Variable Interest Entity [Line Items]                    
Contributions to subsidiaries           1,500,000        
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re                    
Variable Interest Entity [Line Items]                    
Assets     463,500,000     463,500,000   654,800,000    
Liabilities     463,500,000     463,500,000   654,800,000    
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     3,300,000     3,300,000   5,700,000    
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 | Mona Lisa Re | Four Hundred Million Principal At Risk Variable Rate Note                    
Variable Interest Entity [Line Items]                    
Face amount     400,000,000     400,000,000        
Variable Interest Entity, Not Primary Beneficiary | Langhorne Partners                    
Variable Interest Entity [Line Items]                    
Investments in other ventures, under equity method     $ 100,000     100,000   $ 100,000    
Variable Interest Entity, Not Primary Beneficiary | RenaissanceRe Holdings Ltd. | Langhorne Holdings LLC                    
Variable Interest Entity [Line Items]                    
Payments of capital distribution       $ 1,500,000            
Variable Interest Entity, Not Primary Beneficiary | RenaissanceRe Holdings Ltd. | Langhorne Holdings LLC | Subsequent Event                    
Variable Interest Entity [Line Items]                    
Payments of capital distribution   $ 800,000                
Variable Interest Entity, Not Primary Beneficiary | Renaissance Reinsurance Ltd. | Mona Lisa Re                    
Variable Interest Entity [Line Items]                    
Ceded premiums written           18,300,000 25,100,000      
Ceded premiums earned           16,000,000 19,500,000      
Variable Interest Entity, Not Primary Beneficiary | DaVinci Reinsurance Ltd. | Mona Lisa Re                    
Variable Interest Entity [Line Items]                    
Ceded premiums written           4,600,000 6,200,000      
Ceded premiums earned           4,000,000 $ 4,800,000      
Variable Interest Entity, Not Primary Beneficiary | Medici | Mona Lisa Re                    
Variable Interest Entity [Line Items]                    
Payments of capital distribution           $ 16,500,000