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Debt and Credit Facilities (Narrative) (Details) £ in Thousands | May. 04, 2015 USD ($) | Mar. 24, 2015 USD ($) | Mar. 17, 2010 USD ($) | Nov. 02, 2005 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2015 GBP (£) | May. 15, 2015 USD ($) | Mar. 31, 2015 USD ($) | Mar. 02, 2015 USD ($)
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Margin facility amount outstanding |  |  |  |  | $ 613,249,000 | £ 70,000 |  |  |
Bridge Loan |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  |  |  |  |  |  | $ 300,000,000
Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  | $ 0 |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Letter of credit aggregate commitment |  |  |  |  |  |  | $ 250,000,000 |  |
Line of credit faciltiy, maximum borrowing capacity |  |  |  |  |  |  | $ 350,000,000 |  |
Debt to capital ratio |  |  |  |  | 0.35 | 0.35 |  |  |
Minimum net worth requirements |  |  |  |  | $ 2,900,000,000 |  |  |  |
Standby Letter of Credit Facility | National Australia Bank Limited |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  | 0 |  |  |  |
RenaissanceRe Finance, Inc. | 3.700% Senior Notes Due April 1, 2025 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior notes interest rate |  | 3.70% |  |  |  |  |  |  |
Debt Instrument, face amount |  | $ 300,000,000 |  |  |  |  |  |  |
Debt instrument maturity date |  | April 1, 2025 |  |  |  |  |  |  |
RenRe North America Holdings Inc. | 5.75% Senior Notes Due March 15, 2020 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior notes interest rate |  |  | 5.75% |  |  |  |  |  |
Debt Instrument, face amount |  |  | $ 250,000,000 |  |  |  |  |  |
Debt instrument maturity date |  |  | March 15, 2020 |  |  |  |  |  |
Platinum Underwriters Finance, Inc. | Series B 7.50% Notes Due June 1, 2017 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior notes interest rate |  |  |  | 7.50% |  |  |  |  |
Debt Instrument, face amount |  |  |  | $ 250,000,000 |  |  |  |  |
Debt instrument maturity date |  |  |  | June 1, 2017 |  |  |  |  |
Bilateral Facility Participants | Bilateral Facility | Letter of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit faciltiy, maximum borrowing capacity |  |  |  |  |  |  |  | $ 300,000,000 |
Bilateral Facility Participants | Bilateral Facility | Letter of Credit | Citibank Europe PLC |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  | 143,778,000 |  |  |  |
Loan agreement, remaining borrowing capacity |  |  |  |  | 156,200,000 |  |  |  |
DaVinciRe Holdings Ltd. |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Loan agreement with related party | $ 100,000,000 |  |  |  |  |  |  |  |
DaVinciRe Holdings Ltd. | 4.750% Senior Notes Due May 1, 2025 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior notes interest rate | 4.75% |  |  |  |  |  |  |  |
Debt Instrument, face amount | $ 150,000,000 |  |  |  |  |  |  |  |
Debt instrument maturity date | May 1, 2025 |  |  |  |  |  |  |  |
Syndicate 1458 | Letter of Credit | Citibank Europe PLC |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  | 300,000,000 |  |  |  |
Margin facility amount outstanding | £ |  |  |  |  |  | £ 70,000 |  |  |
RenaissanceRe Specialty Risks Ltd. | Letter of Credit | Citibank Europe PLC |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  | 9,129,000 |  |  |  |
RenaissanceRe Specialty Risks Ltd. | Bilateral Facility | Letter of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit faciltiy, maximum borrowing capacity |  |  |  |  |  |  |  | 50,000,000 |
Platinum Underwriters Bermuda, Ltd. and Renaissance Reinsurance U.S. Inc. | Bilateral Facility | Letter of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit faciltiy, maximum borrowing capacity |  |  |  |  |  |  |  | $ 25,000,000 |
Top Layer Reinsurance Ltd. | Letter of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Collateralized letter of credit and reimbursement agreement |  |  |  |  | 37,500,000 |  |  |  |
Top Layer Reinsurance Ltd. | Letter of Credit | Capital Support Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mandatory capital contribution in the event of capital and surplus reduction below a specified level |  |  |  |  | $ 50,000,000 |  |  |  |

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