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Debt and Credit Facilities (Credit Facilities Narrative) (Details) | Nov. 23, 2015 USD ($) | Dec. 31, 2019 USD ($) | Nov. 07, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 21, 2019 USD ($) | Mar. 22, 2019 USD ($) | Nov. 09, 2018 USD ($) | May 31, 2016 USD ($) | Sep. 17, 2010 USD ($)
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Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit facilities outstanding |  |  |  | $ 1,110,756,000 |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Letter of credit aggregate commitment |  |  |  |  |  |  | $ 500,000,000.0 |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  | 750,000,000.0 |  |
Debt to capital ratio |  | 0.35 |  |  |  |  |  |  |
Minimum net worth requirements |  | $ 2,900,000,000 |  |  |  |  |  |  |
Unsecured Bilateral Facility | Wells Fargo | Letter of Credit |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | $ 25,000,000.0 |  |  |  |
Credit facilities outstanding |  | 0 |  |  |  |  |  |  |
Unsecured Bilateral Facility | Citibank Europe PLC | Letter of Credit |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit facilities outstanding |  | 270,700,000 |  |  |  |  |  |  |
Unsecured Bilateral Facility | Credit Suisse (Switzerland) Ltd. | Letter of Credit |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | $ 125,000,000.0 |  |  |
Debt to capital ratio |  |  |  |  |  | 0.35 |  |  |
Minimum net worth requirements |  |  |  |  |  | $ 3,000,000,000.0 |  |  |
Credit facilities outstanding |  | 111,100,000 |  |  |  |  |  |  |
Secured Bilateral Facility | Wells Fargo | Letter of Credit |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit facilities outstanding |  | 31,500,000 |  |  |  |  |  |  |
Secured Bilateral Facility | Citibank Europe PLC | Letter of Credit |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit facilities outstanding |  | 266,500,000 |  |  |  |  |  |  |
Renaissance Reinsurance FAL Facility | Letter of Credit |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit facilities outstanding |  | 290,000,000.0 |  |  |  |  |  |  |
Bridge Loan | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  | $ 50,000,000.0 |  |
Line of Credit | Bank of Montreal, Citibank Europe and ING Bank | Letter of Credit |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit facilities outstanding |  |  |  | 290,000,000 |  |  |  |  |
Line of Credit | Unsecured Bilateral Facility | Letter of Credit |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit facilities outstanding |  |  |  | 381,770,000 |  |  |  |  |
Line of Credit | Secured Bilateral Facility | Letter of Credit |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit facilities outstanding |  |  |  | $ 298,063,000 |  |  |  |  |
Bilateral Facility Participants | Letter of Credit | Secured Bilateral Facility | Citibank Europe PLC |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 300,000,000.0
Loan agreement, remaining borrowing capacity |  | $ 33,500,000 |  |  |  |  |  |  |
Renaissance Reinsurance U.S. Inc. | Letter of Credit | Secured Bilateral Facility | Citibank Europe PLC |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 25,000,000.0
Syndicate 1458 | Letter of Credit | Renaissance Reinsurance FAL Facility | Bank of Montreal, Citibank Europe and ING Bank |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Collateral amount, percent of aggregate outstanding letters of credit in case of Full Collateralization Event |  | 100.00% |  |  |  |  |  |  |
Syndicate 1458 | Line of Credit | Renaissance Reinsurance FAL Facility | Bank of Montreal, Citibank Europe and ING Bank |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Aggregate amount of issuances | $ 140,000,000.0 |  |  |  |  |  |  |  |
Termination period from date of notice | 4 years |  |  |  |  |  |  |  |
Syndicate 1458 | Line of Credit | Renaissance Reinsurance FAL Facility | Bank of Montreal, Citibank Europe and ING Bank | Line of Credit |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 290,000,000.0 |  |  |  |  | $ 255,000,000.0 |
Greater than or equal to | Syndicate 1458 | Letter of Credit | Renaissance Reinsurance FAL Facility | Bank of Montreal, Citibank Europe and ING Bank |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Collateral amount, percent of aggregate outstanding letters of credit | 60.00% |  |  |  |  |  |  |  |
Less than | Syndicate 1458 | Letter of Credit | Renaissance Reinsurance FAL Facility | Bank of Montreal, Citibank Europe and ING Bank |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Collateral amount, percent of aggregate outstanding letters of credit | 100.00% |  |  |  |  |  |  |  |
Letter of Credit | Top Layer Reinsurance Ltd. |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Collateralized letter of credit and reimbursement agreement |  | $ 37,500,000 |  |  |  |  |  |  |
Capital Support Agreement | Letter of Credit | Top Layer Reinsurance Ltd. |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Mandatory capital contribution in the event of capital and surplus reduction below a specified level |  | $ 50,000,000.0 |  |  |  |  |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=119400593&loc=d3e572229-122910 + Details
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