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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 |

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