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Debt and Credit Facilities (Narrative) (Details) £ in Thousands |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |
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Nov. 23, 2015 USD ($) letter_of_credit | May 04, 2015 USD ($) | Mar. 24, 2015 USD ($) | Mar. 17, 2010 USD ($) | Nov. 02, 2005 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2016 GBP (£) | May 31, 2016 USD ($) | May 31, 2016 GBP (£) | Mar. 31, 2016 USD ($) | Mar. 31, 2016 GBP (£) | Nov. 23, 2015 GBP (£) | May 15, 2015 USD ($) | Sep. 17, 2010 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin facility amount outstanding |  |  |  |  |  |  |  |  |  |  |  | $ 770,593,000 | £ 100,000 |  |  |
Interest paid |  |  |  |  |  | $ 54,000,000 | $ 40,800,000 | $ 17,200,000 |  |  |  |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  |  | 894,200,000 |  |  |  |  |  |  |  |  |  |
DaVinciRe Holdings Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan agreement with related party |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | Less than |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | 140,829,000 |  |  |  |  |  |  |  |  |  |
Standby Letter of Credit Facility | National Australia Bank Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  |  | 4,855,000 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | 244,909,000 |  |  |  |  |  |  |  |  |  |
Loan agreement, remaining borrowing capacity |  |  |  |  |  | 55,100,000 |  |  |  |  |  |  |  |  |  |
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
Renaissance Reinsurance FAL Facility | Syndicate 1458 | Bank Of Montreal, Citibank Europe and ING Bank | Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of credit aggregate commitment | $ 360,000,000 |  |  |  |  |  |  |  |  | $ 380,000,000 | £ 90,000 |  |  | £ 85,000 |  |
Letters of credit outstanding |  |  |  |  |  | $ 380,000,000 |  |  | £ 90,000 |  |  |  |  |  |  |
Number of letters of credit | letter_of_credit | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral amount, percent of aggregate outstanding letters of credit in option 1 | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
Collateral amount, percent of aggregate outstanding letters of credit in case of Full Collateralization Event | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
Renaissance Reinsurance FAL Facility | Syndicate 1458 | Bank Of Montreal, Citibank Europe and ING Bank | 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% |  |  |  |  |  |  |  |  |  |  |  |  | 60.00% |  |
Renaissance Reinsurance FAL Facility | Syndicate 1458 | Bank Of Montreal, Citibank Europe and ING Bank | Letter of Credit | Less than |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral amount, percent of aggregate outstanding letters of credit, option 2 | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
Specialty Risks FAL Facility | Syndicate 1458 | Citibank Europe PLC | Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding | £ |  |  |  |  |  |  |  |  | £ 10,000 |  |  |  |  |  |  |
Platinum Underwriters Holdings, Ltd. | Bridge Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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