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Sale of RenaissanceRe UK (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Transfers and Servicing [Abstract]      
Loss on sale of RenaissanceRe UK $ 30,200 $ 30,242 $ 0