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Variable Interest Entities (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Variable Interest Entity [Line Items]          
Assets $ 17,023,378,000   $ 17,023,378,000   $ 15,226,131,000
Liabilities 10,669,889,000   10,669,889,000   9,538,250,000
Ceded premiums written 372,834,000 $ 271,670,000 869,442,000 $ 649,624,000  
Ceded premiums earned 242,254,000 $ 194,439,000 477,487,000 385,561,000  
Investments in other ventures, under equity method 111,935,000   111,935,000   101,974,000
Upsilon RFO Re Ltd. | Variable Interest Entity, Primary Beneficiary          
Variable Interest Entity [Line Items]          
Return of capital         84,300,000
Assets 1,500,000,000   1,500,000,000   1,200,000,000
Liabilities 1,500,000,000   1,500,000,000   1,200,000,000
Upsilon RFO Re Ltd. | Variable Interest Entity, Primary Beneficiary | Non-Voting Preference Shares          
Variable Interest Entity [Line Items]          
Issuance of equity to third party investors         180,600,000
Contributions to subsidiaries     $ 107,800,000   27,200,000
Upsilon RFO Re Ltd. | Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd.          
Variable Interest Entity [Line Items]          
Return of capital         $ 33,000,000
Variable interest entity, ownership percentage     14.60%   20.80%
Upsilon RFO Re Ltd. | Variable Interest Entity, Primary Beneficiary | Third party investor | Non-Voting Preference Shares          
Variable Interest Entity [Line Items]          
Contributions to subsidiaries     $ 805,900,000   $ 7,500,000
Renaissance Reinsurance Ltd. | Variable Interest Entity, Primary Beneficiary | Fibonacci Reinsurance Ltd.          
Variable Interest Entity [Line Items]          
Ceded premiums written     9,100,000 9,400,000  
Ceded premiums earned     3,100,000 3,800,000  
Mona Lisa Re Ltd | Variable Interest Entity, Not Primary Beneficiary          
Variable Interest Entity [Line Items]          
Assets 25,400,000   25,400,000   25,900,000
Liabilities 25,400,000   25,400,000   25,900,000
Mona Lisa Re Ltd | Variable Interest Entity, Not Primary Beneficiary | Renaissance Reinsurance Ltd.          
Variable Interest Entity [Line Items]          
Ceded premiums written     200,000 100,000  
Ceded premiums earned     200,000 3,600,000  
Mona Lisa Re Ltd | Variable Interest Entity, Not Primary Beneficiary | DaVinci Reinsurance Ltd.          
Variable Interest Entity [Line Items]          
Ceded premiums written     200,000 37,000  
Ceded premiums earned     200,000 $ 2,500,000  
Fibonacci Reinsurance Ltd. | Variable Interest Entity, Primary Beneficiary | Other Investments          
Variable Interest Entity [Line Items]          
Investment in participating notes 6,900,000   6,900,000   14,100,000
Langhorne Holdings LLC | Variable Interest Entity, Not Primary Beneficiary          
Variable Interest Entity [Line Items]          
Investments in other ventures, under equity method 1,300,000   1,300,000   600,000
Langhorne Partners          
Variable Interest Entity [Line Items]          
Investments in other ventures, under equity method $ 100,000   $ 100,000    
Langhorne Partners | Variable Interest Entity, Not Primary Beneficiary          
Variable Interest Entity [Line Items]          
Investments in other ventures, under equity method         $ 0