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Debt and Credit Facilities - Credit Facilities Narrative (Details) | Nov. 07, 2019 USD ($) | Dec. 31, 2023 USD ($) | Nov. 01, 2023 USD ($) | Oct. 31, 2023 USD ($) | Nov. 18, 2022 USD ($) | Sep. 08, 2022 USD ($) | Dec. 16, 2021 USD ($) | Jun. 21, 2019 USD ($)
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Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Credit facilities outstanding |  | $ 1,581,365,000 |  |  |  |  |  |
Top Layer Reinsurance Ltd. | Letter of Credit |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | 37,500,000 |  |  |  |  |  |
Top Layer Reinsurance Ltd. | Letter of Credit | 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] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | 75,000,000 |  |  |  |  |  |
Credit facilities outstanding |  | $ 75,000,000 |  |  |  |  |  |
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 |  | $ 4,000,000,000 |  |  |  |  |  |
Revolving Credit Facility | Bridge Loan |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | $ 50,000,000 |  |  |
Secured Bilateral Facility | Letter of Credit | Wells Fargo |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | $ 200,000,000
Credit facilities outstanding |  | 175,000,000 |  |  |  |  |  |
Secured Bilateral Facility | Letter of Credit | Citibank Europe plc |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Credit facilities outstanding |  | 280,100,000 |  |  |  |  |  |
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 |  |  | $ 320,000,000 | $ 180,000,000 |  |  |  |
Accordion feature, maximum borrowing capacity |  |  | $ 350,000,000 |  |  |  |  |
Loan agreement, remaining borrowing capacity |  | 39,900,000 |  |  |  |  |  |
Unsecured Bilateral Facility | Letter of Credit | Wells Fargo |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Credit facilities outstanding |  | 0 |  |  |  |  |  |
Unsecured Bilateral Facility | Letter of Credit | Citibank Europe plc |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Credit facilities outstanding |  | 366,500,000 |  |  |  |  |  |
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 |  | 193,300,000 |  |  |  |  |  |
Debt to capital ratio |  |  |  |  |  |  | 0.35 |
Minimum net worth requirements |  |  |  |  |  |  | $ 4,000,000,000 |
Uncommitted Letter of Credit Facility | Letter of Credit | Société Générale, New York Branch (“SocGen”) |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | $ 250,000,000 |  |
Credit facilities outstanding |  | 250,000,000 |  |  |  |  |  |
Percentage of maximum aggregate amount to be secured |  |  |  |  |  | 40.00% |  |
Secured Letter of Credit Facility | Letter of Credit | Citibank Europe |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Credit facilities outstanding |  | 16,500,000 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Credit facilities outstanding |  | $ 225,000,000 |  |  |  |  |  |
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 |  |  |  |  |  |  |
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 | Minimum |  |  |  |  |  |  |  |
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 | Maximum |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Collateral amount, percent of aggregate outstanding letters of credit | 100.00% |  |  |  |  |  |  |

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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 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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