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Acquisition of Tokio Millennium Re (Schedule of Financial Results) (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
Business Acquisition [Line Items]                      
Total revenues $ 1,395,323 $ 1,332,293 $ 1,548,436 $ 896,264 $ 1,105,305 $ 1,051,148 $ 1,238,380 $ 807,121 $ 5,172,316 $ 4,201,954 $ 2,074,941
Net income available to RenaissanceRe common shareholders $ 189,812 $ 47,799 $ 575,845 $ (81,974) $ 33,773 $ 36,698 $ 367,854 $ 273,717 731,482 712,042 $ 197,276
TMR                      
Business Acquisition [Line Items]                      
Total revenues                   922,727  
Net income available to RenaissanceRe common shareholders                   99,169  
Corporate expenses associated with the acquisition                 $ 9,100 $ 49,700