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Debt and Credit Facilities (Narrative) (Details) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 GBP (£) | Jun. 29, 2017 USD ($) | Jun. 01, 2017 USD ($) | May 25, 2017 USD ($) | Dec. 31, 2016 | May 31, 2016 USD ($) | May 31, 2016 GBP (£) | Nov. 23, 2015 USD ($) | Nov. 23, 2015 GBP (£) | May 15, 2015 USD ($) | May 04, 2015 USD ($) | Mar. 24, 2015 USD ($) | Sep. 17, 2010 USD ($) | Mar. 17, 2010 USD ($)
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin facility amount outstanding | $ 487,857,000 | £ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin facility amount outstanding | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
3.450% Senior Notes due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes interest rate | 3.45% | 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 |  |  |  |  |  |  |  |  |  |  |  |
3.700% Senior Notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes interest rate | 3.70% | 3.70% |  |  |  |  |  |  |  |  |  |  |  |  |
3.700% Senior Notes due 2025 | RenaissanceRe Finance, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 3.70% |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 |  |
5.75% Senior Notes Due March 15, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes interest rate | 5.75% | 5.75% |  |  |  |  |  |  |  |  |  |  |  |  |
5.75% Senior Notes Due March 15, 2020 | RenRe North America Holdings Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.75%
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000
Series B 7.50% Notes Due June 1, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes interest rate |  |  |  |  |  | 7.50% |  |  |  |  |  |  |  |  |
Series B 7.50% Notes Due June 1, 2017 | Platinum Underwriters Finance, Inc | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes interest rate |  |  |  | 7.50% |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |
4.750% Senior Notes Due May 1, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes interest rate | 4.75% | 4.75% |  |  |  |  |  |  |  |  |  |  |  |  |
4.750% Senior Notes Due May 1, 2025 | DaVinciRe Holdings Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes interest rate |  |  |  |  |  |  |  |  |  |  |  | 4.75% |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000 |  |  |
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 | Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin facility amount outstanding | 106,794,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Standby Letter of Credit Facility | National Australia Bank Limited | Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin facility amount outstanding | 3,785,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bilateral Facility | Citibank Europe PLC | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin facility amount outstanding | 197,278,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan agreement, remaining borrowing capacity | 102,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bilateral Facility | Platinum Underwriters Bermuda, Ltd. and Renaissance Reinsurance U.S. Inc. | Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000 |
Renaissance Reinsurance FAL Facility | Bank Of Montreal, Citibank Europe and ING Bank | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin facility amount outstanding | $ 180,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Renaissance Reinsurance FAL Facility | Syndicate 1458 | Bank Of Montreal, Citibank Europe and ING Bank | Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  | 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 in 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 in option 2 |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |  |  |
Renaissance Reinsurance FAL Facility | Syndicate 1458 | Bank Of Montreal, Citibank Europe and ING Bank | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount of issuances |  |  |  |  |  |  |  |  | $ 150,000,000.0 |  |  |  |  |  |
Renaissance Reinsurance FAL Facility | Line of Credit | Syndicate 1458 | Bank Of Montreal, Citibank Europe and ING Bank | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of credit aggregate commitment |  |  |  |  |  |  |  |  | $ 360,000,000 | £ 85,000,000 |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | $ 180,000,000 |  | $ 380,000,000 |  |  |  |  |  |  |  |
Renaissance Reinsurance FAL Facility | Line Of Credit Two | Syndicate 1458 | Bank Of Montreal, Citibank Europe and ING Bank | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | £ |  |  |  |  |  |  |  | £ 90,000,000 |  |  |  |  |  |  |
Specialty Risks FAL Facility | Bank Of Montreal, Citibank Europe and ING Bank | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin facility amount outstanding | £ |  | £ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Platinum Underwriters Holdings, Ltd. | Bridge Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 |  |

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- Definition Contractual interest rate for funds borrowed, under the debt 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying amount, as of the date of the latest financial statement presented, of all assets that are pledged as collateral for the payment of the related debt obligation primarily arising from secured borrowings, repurchase agreements or other current or potential obligations, where the secured party does not have the right by contract or custom to sell or re-pledge the collateral and therefore are not reclassified and separately reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729 + Details
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