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Debt and Credit Facilities (Credit Facilities Narrative) (Details) | Nov. 07, 2019 USD ($) | Dec. 31, 2021 USD ($) | Dec. 21, 2021 USD ($) | Nov. 03, 2021 USD ($) | Jun. 26, 2020 USD ($) | Jun. 11, 2020 USD ($) | Mar. 22, 2019 USD ($) | Nov. 09, 2018 USD ($) | Nov. 23, 2015 | Sep. 17, 2010 USD ($)
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Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facilities outstanding |  | $ 1,084,764,000 |  |  |  |  |  |  |  |
Letter of Credit | Top Layer Reinsurance Ltd. |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Collateralized letter of credit and reimbursement agreement |  | 37,500,000 |  |  |  |  |  |  |  |
Letter of Credit | Top Layer Reinsurance Ltd. | Capital Support Agreement |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Mandatory capital contribution in the event of capital and surplus reduction below a specified level |  | 50,000,000 |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facilities outstanding |  | 0 |  |  |  |  |  |  |  |
Revolving Credit Facility | Medici |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Collateralized letter of credit and reimbursement agreement |  | $ 40,000,000 |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Letter of credit aggregate commitment |  |  |  |  |  |  |  | $ 500,000,000 |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | 700,000,000 |  |
Debt to capital ratio |  | 0.35 |  |  |  |  |  |  |  |
Minimum net worth requirements |  | $ 2,900,000,000 |  |  |  |  |  |  |  |
Revolving Credit Facility | Bridge Loan |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | $ 50,000,000 |  |
Unsecured Bilateral Facility | Letter of Credit | Wells Fargo |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | $ 100,000,000 |  |  |  |
Credit facilities outstanding |  | 0 |  |  |  |  |  |  |  |
Unsecured Bilateral Facility | Letter of Credit | Citibank Europe plc |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facilities outstanding |  | 298,300,000 |  |  |  |  |  |  |  |
Unsecured Bilateral Facility | Letter of Credit | Credit Suisse (Switzerland) Ltd. |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | $ 200,000,000 |  |  |  |  |
Credit facilities outstanding |  | 71,000,000 |  |  |  |  |  |  |  |
Debt to capital ratio |  |  |  |  |  |  | 0.35 |  |  |
Minimum net worth requirements |  |  |  |  |  |  | $ 3,000,000,000 |  |  |
Secured Bilateral Facility | Letter of Credit | Citibank Europe plc | Bilateral Facility Participants |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 350,000,000 |  |  |  |  |  |  | $ 300,000,000
Loan agreement, remaining borrowing capacity |  | 48,100,000 |  |  |  |  |  |  |  |
Secured Bilateral Facility | Letter of Credit | Citibank Europe plc | Renaissance Reinsurance U.S. Inc. |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 25,000,000
Secured Bilateral Facility | Letter of Credit | Wells Fargo |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facilities outstanding |  | 97,000,000 |  |  |  |  |  |  |  |
Secured Bilateral Facility | Letter of Credit | Citibank Europe plc |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facilities outstanding |  | 301,900,000 |  |  |  |  |  |  |  |
Secured Letter of Credit Facility | Letter of Credit | Citibank Europe |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facilities outstanding |  | $ 11,500,000 |  |  |  |  |  |  |  |
Renaissance Reinsurance FAL Facility | Bank of Montreal, Citibank Europe and ING Bank | Syndicate 1458 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate amount of issuances | $ 140,000,000 |  |  |  |  |  |  |  |  |
Termination period from date of notice | 4 years |  |  |  |  |  |  |  |  |
Renaissance Reinsurance FAL Facility | Letter of Credit | Bank of Montreal, Citibank Europe and ING Bank | Syndicate 1458 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Collateral amount, percent of aggregate outstanding letters of credit in case of Full Collateralization Event |  | 100.00% |  |  |  |  |  |  |  |
Renaissance Reinsurance FAL Facility | Letter of Credit | Bank of Montreal, Citibank Europe and ING Bank | Syndicate 1458 | Greater than or equal to |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Collateral amount, percent of aggregate outstanding letters of credit |  |  |  |  |  |  |  |  | 60.00% |
Renaissance Reinsurance FAL Facility | Letter of Credit | Bank of Montreal, Citibank Europe and ING Bank | Syndicate 1458 | Less than |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Collateral amount, percent of aggregate outstanding letters of credit |  |  |  |  |  |  |  |  | 100.00% |
Renaissance Reinsurance FAL Facility | Letter of Credit |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facilities outstanding |  | $ 275,000,000 |  |  |  |  |  |  |  |
Renaissance Reinsurance FAL Facility | Letter of Credit | Bank of Montreal, Citibank Europe and ING Bank | Syndicate 1458 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 225,000,000 |  |  | $ 275,000,000 |  |  |  |  |  |

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- Definition Line of Credit Facility, Maximum Increases In Or Issuances Of Borrowing Capacity + References No definition available. + 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://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=120391452&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=120398452&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=120400017&loc=d3e572229-122910 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12021-110248 + Details
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