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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 ($)
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