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Acquisition of Tokio Millennium Re (Schedule of Financial Results) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]      
Total revenues $ 5,277,709 $ 5,172,316 $ 4,201,954
Net income (loss) available (attributable) to RenaissanceRe common shareholders $ (73,421) 731,482 712,042
TMR      
Business Acquisition [Line Items]      
Total revenues     922,727
Net income (loss) available (attributable) to RenaissanceRe common shareholders     99,169
Corporate expenses associated with the acquisition   $ 9,100 $ 49,700