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Schedule II. Condensed Financial Information Of Registrant (Statements of Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]                      
Net income $ 197,101 $ 55,088 $ 583,134 $ (72,918) $ 42,962 $ 45,887 $ 377,043 $ 282,906 $ 762,405 $ 748,798 $ 227,364
Change in net unrealized gains on investments, net of tax                 606 2,173 (1,657)
Foreign currency translation adjustments, net of tax                 (11,309) (2,679) 0
Comprehensive income attributable to RenaissanceRe                 751,702 748,292 225,707
Parent Company                      
Condensed Financial Statements, Captions [Line Items]                      
Net income                 762,405 748,798 227,364
Change in net unrealized gains on investments, net of tax                 606 2,173 (1,657)
Foreign currency translation adjustments, net of tax                 (11,309) (2,679) 0
Comprehensive income attributable to RenaissanceRe                 $ 751,702 $ 748,292 $ 225,707