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Debt and Credit Facilities (Narrative) (Details) | May 24, 2017 USD ($) letter_of_credit | Sep. 30, 2017 | Jun. 29, 2017 USD ($) | Jun. 01, 2017 USD ($) | May 25, 2017 USD ($) | May 25, 2017 GBP (£) | Dec. 31, 2016
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3.450% Senior Notes due 2027 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes interest rate |  | 3.45% |  |  |  |  |
3.450% Senior Notes due 2027 | RenaissanceRe Finance, Inc. | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes interest rate |  |  | 3.45% |  |  |  |
Debt instrument, Face amount |  |  | $ 300,000,000 |  |  |  |
Series B 7.50% Senior Notes due 2017 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes interest rate |  |  |  |  |  |  | 7.50%
Series B 7.50% Senior Notes due 2017 | Platinum Underwriters Finance, Inc | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes interest rate |  |  |  | 7.50% |  |  |
Debt instrument, Face amount |  |  |  | $ 250,000,000 |  |  |
Renaissance Reinsurance FAL Facility | Syndicate 1458 | Line of Credit | Bank Of Montreal, Citibank Europe and ING Bank |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of letters of credit | letter_of_credit | 2 |  |  |  |  |  |
Maximum increases in or issuances of borrowing capacity |  |  |  |  | $ 75,000,000 |  |
Renaissance Reinsurance FAL Facility | Syndicate 1458 | Line of Credit | Bank Of Montreal, Citibank Europe and ING Bank | Line of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Letter of credit aggregate commitment | $ 380,000,000 |  |  |  | $ 180,000,000 |  |
Renaissance Reinsurance FAL Facility | Syndicate 1458 | Line of Credit | Bank Of Montreal, Citibank Europe and ING Bank | Line Of Credit Two |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Letter of credit aggregate commitment | £ |  |  |  |  |  | £ 90,000,000 |

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