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VARIABLE INTEREST ENTITIES - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
account
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Variable Interest Entity [Line Items]      
Number of segregated accounts | account 4    
Assets $ 50,707,550 $ 49,007,105  
Liabilities 33,155,789 33,451,316  
Investments in other ventures, under equity method (Note 5) 102,770 112,624  
Redeemable noncontrolling interests 6,977,749 6,100,831  
Ceded premiums written 1,780,850 1,394,553 $ 2,017,380
Ceded premiums earned 1,817,302 1,614,432 1,850,807
Vermeer      
Variable Interest Entity [Line Items]      
Redeemable noncontrolling interests 1,799,857 1,555,297 1,490,840
Fontana      
Variable Interest Entity [Line Items]      
Redeemable noncontrolling interests 469,439 353,823 268,031
Primary Beneficiary | Upsilon RFO Re Ltd.      
Variable Interest Entity [Line Items]      
Assets 1,900,000 2,400,000  
Liabilities 1,900,000 2,400,000  
Net assets 60,500 74,200  
Primary Beneficiary | Investors of Upsilon RFO Diversified I, II and III | Upsilon RFO Re Ltd.      
Variable Interest Entity [Line Items]      
Payments of capital distributions 397,600 988,500  
Net assets 282,200 500,000  
Primary Beneficiary | RenaissanceRe Holdings Ltd. | Upsilon RFO Re Ltd.      
Variable Interest Entity [Line Items]      
Payments of capital distributions $ 59,800 $ 125,500  
Variable interest entity, ownership percentage 12.70% 14.30%  
Primary Beneficiary | RenaissanceRe Holdings Ltd. | Upsilon RFO Re Ltd. | Preference shares      
Variable Interest Entity [Line Items]      
Investment in variable interest entity   $ 10,200  
Primary Beneficiary | Investor | Upsilon RFO Re Ltd. | Preference shares      
Variable Interest Entity [Line Items]      
Investment in variable interest entity   39,800  
Not Primary Beneficiary | RenaissanceRe Upsilon Diversified Fund      
Variable Interest Entity [Line Items]      
Investments in other ventures, under equity method (Note 5) $ 500 800  
Not Primary Beneficiary | NOC1      
Variable Interest Entity [Line Items]      
Investments in other ventures, under equity method (Note 5) 1,700 1,700  
Not Primary Beneficiary | Alpha Cat entities      
Variable Interest Entity [Line Items]      
Investments in other ventures, under equity method (Note 5) 3,600 4,400  
Not Primary Beneficiary | RenaissanceRe Upsilon Diversified Fund      
Variable Interest Entity [Line Items]      
Assets 440,600 600,800  
Liabilities 140,900 108,000  
Not Primary Beneficiary | RenaissanceRe Upsilon Diversified Fund | Upsilon RFO Re Ltd.      
Variable Interest Entity [Line Items]      
Investment owned, fair value 304,000 503,100  
Not Primary Beneficiary | NOC1      
Variable Interest Entity [Line Items]      
Assets 173,400 196,500  
Liabilities 2,200 22,800  
Not Primary Beneficiary | Vermeer      
Variable Interest Entity [Line Items]      
Assets 1,900,000 1,700,000  
Liabilities 93,000 102,700  
Redeemable noncontrolling interests 1,800,000 1,600,000  
Not Primary Beneficiary | Fontana      
Variable Interest Entity [Line Items]      
Assets 2,200,000 1,500,000  
Liabilities 1,600,000 968,500  
Redeemable noncontrolling interests 469,400 353,800  
Not Primary Beneficiary | Mona Lisa Re      
Variable Interest Entity [Line Items]      
Assets 936,100 436,900  
Liabilities 936,100 436,900  
Not Primary Beneficiary | Mona Lisa Re | Other Investments      
Variable Interest Entity [Line Items]      
Investment in participating notes 7,000 2,200  
Not Primary Beneficiary | Tailwind Re Ltd      
Variable Interest Entity [Line Items]      
Assets 416,800 417,100  
Liabilities 416,800 417,100  
Not Primary Beneficiary | Tailwind Re Ltd | Other Investments      
Variable Interest Entity [Line Items]      
Investment in participating notes 0 800  
Not Primary Beneficiary | Alpha Cat entities      
Variable Interest Entity [Line Items]      
Assets 3,000,000 5,000,000  
Liabilities 1,300,000 2,400,000  
Not Primary Beneficiary | RenaissanceRe Holdings Ltd. | RenaissanceRe Upsilon Diversified Fund      
Variable Interest Entity [Line Items]      
Payments of capital distributions 500 1,200  
Not Primary Beneficiary | RenaissanceRe Holdings Ltd. | RenaissanceRe Upsilon Diversified Fund | Preference shares      
Variable Interest Entity [Line Items]      
Investment in variable interest entity   100  
Not Primary Beneficiary | RenaissanceRe Holdings Ltd. | NOC1 | Preference shares      
Variable Interest Entity [Line Items]      
Investment in variable interest entity 200 1,600  
Redemption of preference shares 500    
Not Primary Beneficiary | RenaissanceRe Holdings Ltd. | Tailwind Re Ltd      
Variable Interest Entity [Line Items]      
Ceded premiums written 42,700 0  
Ceded premiums earned 42,700 6,500  
Not Primary Beneficiary | Investors of Upsilon RFO Diversified IV | Upsilon RFO Re Ltd.      
Variable Interest Entity [Line Items]      
Net assets 115,900 88,300  
Not Primary Beneficiary | Investors of Upsilon RFO Diversified IV | Upsilon RFO Re Ltd. | Preference shares      
Variable Interest Entity [Line Items]      
Investment in variable interest entity   81,400  
Not Primary Beneficiary | Investor | RenaissanceRe Upsilon Diversified Fund      
Variable Interest Entity [Line Items]      
Payments of capital distributions 333,400 844,100  
Not Primary Beneficiary | Investor | RenaissanceRe Upsilon Diversified Fund | Preference shares      
Variable Interest Entity [Line Items]      
Investment in variable interest entity 16,900 30,000  
Not Primary Beneficiary | Investor | NOC1 | Preference shares      
Variable Interest Entity [Line Items]      
Investment in variable interest entity 20,000 161,500  
Redemption of preference shares 48,800    
Not Primary Beneficiary | Renaissance Reinsurance | Mona Lisa Re      
Variable Interest Entity [Line Items]      
Ceded premiums written 45,200 32,800 39,600
Ceded premiums earned 39,500 32,800 39,400
Not Primary Beneficiary | DaVinci Reinsurance | Mona Lisa Re      
Variable Interest Entity [Line Items]      
Ceded premiums written 11,700 8,200 9,900
Ceded premiums earned $ 10,300 $ 8,200 $ 9,800