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Acquisition of Platinum (Narrative) (Details) - USD ($) |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 29, 2017 | Sep. 29, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Mar. 02, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 24, 2015
3.700% Senior Notes Due April 1, 2025 |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Senior notes interest rate |  |  |  |  |  | 3.70% |  |  |
Common Shares |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Dividends per common share (in usd per share) | $ 0.32 | $ 0.32 | $ 0.32 | $ 0.32 |  |  |  |  |
Platinum Underwriters Holdings, Ltd. |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Dividends per common share (in usd per share) |  |  |  |  | $ 10 |  |  |  |
Dividends paid, value |  |  |  |  | $ 253,203,000 |  |  |  |
RenaissanceRe Finance, Inc. | 3.700% Senior Notes Due April 1, 2025 |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  | $ 300,000,000
Senior notes interest rate |  |  |  |  |  |  |  |  | 3.70%
Platinum Underwriters Holdings, Ltd. |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percent acquired |  |  |  |  | 100.00% |  |  |  |
Share price (in usd per share) |  |  |  |  | $ 76 |  |  |  |
Aggregate consideration transferred |  |  |  |  | $ 1,932,405,000 |  |  |  |
Cash consideration paid by RenaissanceRe to common shareholders of Platinum and holders of Platinum equity awards |  |  |  |  | 1,160,000,000 |  |  |  |
Funds available to fund acquisition |  |  |  |  | 604,400,000 |  |  |  |
Transaction-related costs |  |  |  |  |  | $ 300,000 | $ 2,100,000 | $ 53,500,000 |
Goodwill |  |  |  |  | 191,729,000 |  |  |  |
Finite lived intangible assets acquired |  |  |  |  | $ 75,200,000 |  |  |  |
Weighted average useful life |  |  |  |  | 8 years |  |  |  |
Indefinite lived intangible assets acquired |  |  |  |  | $ 8,400,000 |  |  |  |
Adjustment to deferred tax asset |  |  |  |  | 29,069,000 |  |  |  |
Other liabilities - deferred tax liability on identifiable intangible assets |  |  |  |  | $ (13,115,000) |  |  |  |
Platinum Underwriters Holdings, Ltd. | Bridge Loan |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  |  |  |  |  |  | $ 300,000,000
Platinum Underwriters Holdings, Ltd. | Common Shares |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Share price (in usd per share) |  |  |  |  | $ 35.96 |  |  |  |
Shares issued (in shares) |  |  |  |  | 7,434,561 |  |  |  |
Shares issued, value |  |  |  |  | $ 761,819,000 |  |  |  |
Cash consideration paid by RenaissanceRe to common shareholders of Platinum and holders of Platinum equity awards |  |  |  |  | $ 904,433,000 |  |  |  |

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