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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 1,105,305 | $ 1,051,148 | $ 1,238,380 | $ 807,121 | $ 547,997 | $ 629,754 | $ 479,204 | $ 417,986 | $ 4,201,954 | $ 2,074,941 | $ 2,103,679
Net income (loss) available (attributable) to RenaissanceRe common shareholders | $ 33,773 | $ 36,698 | $ 367,854 | $ 273,717 | $ (83,906) | $ 32,681 | $ 191,788 | $ 56,713 | 712,042 | 197,276 | $ (244,770)
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 |  |  |  |  |  |  |  |  | $ 49,700 | $ 3,400 |

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