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Acquisition of Platinum (Purchase Price) (Details) - USD ($) $ / shares in Units, $ in Thousands | Dec. 29, 2017 | Sep. 29, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Mar. 02, 2015
--- | --- | --- | --- | --- | ---
Common Shares |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Dividends per common share (in usd per share) | $ 0.32 | $ 0.32 | $ 0.32 | $ 0.32 |
Share price (in usd per share) |  |  |  |  | $ 102.47
Platinum Underwriters Holdings, Ltd. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Agreed cash price paid to common shareholders of Platinum and Platinum Awards (in usd per share) |  |  |  |  | $ 76
Cash consideration paid by RenaissanceRe to common shareholders of Platinum and holders of Platinum equity awards |  |  |  |  | $ 1,160,000
Total purchase price |  |  |  |  | 1,932,405
Net purchase price |  |  |  |  | $ 1,679,202
Platinum Underwriters Holdings, Ltd. | Common Shares |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of Platinum common shares and Platinum equity awards canceled in the acquisition of Platinum (in shares) |  |  |  |  | 25,320,312
Shares issued (in shares) |  |  |  |  | 7,434,561
Market value of RenaissanceRe common shares issued by RenaissanceRe to common shareholders of Platinum and holders of Platinum equity awards |  |  |  |  | $ 761,819
Fair value of Platinum common shares owned by RenaissanceRe and canceled in connection with the acquisition of Platinum |  |  |  |  | $ 12,950
Platinum common shares owned by RenaissanceRe and canceled in connection with the acquisition of Platinum (in shares) |  |  |  |  | (169,220)
Number of Platinum common shares and Platinum equity awards canceled in the acquisition of Platinum excluding those owned by RenaissanceRe and canceled in connection with the acquisition of Platinum (in shares) |  |  |  |  | 25,151,092
Agreed cash price paid to common shareholders of Platinum and Platinum Awards (in usd per share) |  |  |  |  | $ 35.96
Cash consideration paid by RenaissanceRe to common shareholders of Platinum and holders of Platinum equity awards |  |  |  |  | $ 904,433
Platinum Underwriters Holdings, Ltd. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of Platinum common shares and Platinum equity awards canceled in the acquisition of Platinum (in shares) |  |  |  |  | 25,320,312
Dividends per common share (in usd per share) |  |  |  |  | $ 10
Dividends paid, value |  |  |  |  | $ (253,203)

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