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Acquisition of Tokio Millennium Re (Financial Results) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Business Acquisition [Line Items] |  |  |  |  |  |
Total revenues |  | $ 1,238,380 |  | $ 479,204 | $ 2,045,501 | $ 897,190
Net income available to RenaissanceRe common shareholders |  | 367,854 |  | $ 191,788 | 641,571 | $ 248,501
TMR Group Entities |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Total revenues |  | 416,830 |  |  | 416,830 |
Net income available to RenaissanceRe common shareholders |  | 90,915 |  |  | 65,396 |
Corporate expenses associated with the acquisition | $ 40,003 | $ 14,488 | $ 25,500 |  | $ 40,000 |

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