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Acquisition of Tokio Millennium Re (Financial Results) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Business Acquisition [Line Items] |  |  |  |
Total revenues | $ 1,051,148 | $ 629,754 | $ 3,096,649 | $ 1,526,944
Net income available to RenaissanceRe common shareholders | 36,698 | $ 32,681 | 678,269 | $ 281,182
TMR Group Entities |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total revenues | 313,250 |  | 730,080 |
Net income available to RenaissanceRe common shareholders | 31,672 |  | 97,068 |
Corporate expenses associated with the acquisition | $ 4,000 |  | $ 44,000 |

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