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Debt and Credit Facilities (Narrative) (Details) £ in Thousands |  |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 23, 2015 facility | May. 04, 2015 USD ($) | Mar. 24, 2015 USD ($) | Mar. 17, 2010 USD ($) | Nov. 02, 2005 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2015 GBP (£) | May. 15, 2015 USD ($) | Mar. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Margin facility amount outstanding |  |  |  |  |  | $ 712,126,000 |  |  | £ 85,000 |  |
Interest paid |  |  |  |  |  | 40,800,000 | $ 17,200,000 | $ 20,100,000 |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  |  | 837,400,000 |  |  |  |  |
DaVinciRe Holdings Ltd. |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loan agreement with related party |  | $ 100,000,000 |  |  |  |  |  |  |  |  |
RenaissanceRe Specialty Risks Ltd. | Citibank Europe PLC | Letter of Credit |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  |  | 8,861,000 |  |  |  |  |
Syndicate 1458 | Citibank Europe PLC | Letter of Credit |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  |  | $ 360,000,000 |  |  | £ 85,000 |  |
Number of letters of credit | facility | 2 |  |  |  |  |  |  |  |  |  |
Collateral amount, percent of aggregate outstanding letters of credit in option 1 | 100.00% |  |  |  |  |  |  |  |  |  |
Collateral amount, percent of aggregate outstanding letters of credit in case of Full Collateralization Event |  |  |  |  |  | 100.00% |  |  | 100.00% |  |
Syndicate 1458 | Citibank Europe PLC | Letter of Credit | Greater than or equal to |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Collateral amount, percent of aggregate outstanding letters of credit, option 2 | 60.00% |  |  |  |  |  |  |  |  |  |
Syndicate 1458 | Citibank Europe PLC | Letter of Credit | Less than |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Collateral amount, percent of aggregate outstanding letters of credit, option 2 | 100.00% |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, outstanding amount |  |  |  |  |  | $ 0 |  |  |  |  |
3.700% Senior Notes Due April 1, 2025 | RenaissanceRe Finance, Inc. |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 300,000,000 |  |  |  |  |  |  |  |
Senior notes interest rate |  |  | 3.70% |  |  |  |  |  |  |  |
Debt instrument maturity date |  |  | April 1, 2025 |  |  |  |  |  |  |  |
5.75% Senior Notes Due March 15, 2020 | RenRe North America Holdings Inc |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 250,000,000 |  |  |  |  |  |  |
Senior notes interest rate |  |  |  | 5.75% |  |  |  |  |  |  |
Debt instrument maturity date |  |  |  | March 15, 2020 |  |  |  |  |  |  |
Series B 7.50% Notes Due June 1, 2017 | Platinum Underwriters Finance, Inc |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 250,000,000 |  |  |  |  |  |
Senior notes interest rate |  |  |  |  | 7.50% |  |  |  |  |  |
Debt instrument maturity date |  |  |  |  | June 1, 2017 |  |  |  |  |  |
4.750% Senior Notes Due May 1, 2025 | DaVinciRe Holdings Ltd. |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 150,000,000 |  |  |  |  |  |  |  |  |
Senior notes interest rate |  | 4.75% |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  | May 1, 2025 |  |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Letter of credit aggregate commitment |  |  |  |  |  |  |  |  |  | $ 250,000,000 |
Line of credit facility, 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 | Wells Fargo |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  |  | 163,264,000 |  |  |  |  |
Standby Letter of Credit Facility | National Australia Bank Limited |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  |  | 0 |  |  |  |  |
Bilateral Facility | Bilateral Facility Participants | Letter of Credit |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 300,000,000
Bilateral Facility | Bilateral Facility Participants | Citibank Europe PLC | Letter of Credit |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  |  | 180,001,000 |  |  |  |  |
Loan agreement, remaining borrowing capacity |  |  |  |  |  | $ 120,000,000 |  |  |  |  |
Bilateral Facility | Platinum Underwriters Bermuda, Ltd. and Renaissance Reinsurance U.S. Inc. [Member] | Letter of Credit |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 25,000,000

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