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Debt and Credit Facilities (Credit Facilities Narrative) (Details)
Nov. 07, 2019
USD ($)
Dec. 31, 2021
Dec. 31, 2020
USD ($)
Oct. 30, 2020
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     $ 1,080,600,000              
Revolving Credit Facility                    
Line of Credit Facility [Line Items]                    
Credit facilities outstanding     0              
Bank of Montreal, Citibank Europe and ING Bank | Letter of Credit                    
Line of Credit Facility [Line Items]                    
Credit facilities outstanding     $ 225,000,000              
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               700,000,000.0    
Debt to capital ratio     0.35              
Minimum net worth requirements     $ 2,900,000,000              
Unsecured Bilateral Facility | Letter of Credit                    
Line of Credit Facility [Line Items]                    
Credit facilities outstanding     448,193,000              
Unsecured Bilateral Facility | Wells Fargo | Letter of Credit                    
Line of Credit Facility [Line Items]                    
Line of credit facility, maximum borrowing capacity           $ 100,000,000.0        
Credit facilities outstanding     0              
Unsecured Bilateral Facility | Citibank Europe plc | Letter of Credit                    
Line of Credit Facility [Line Items]                    
Credit facilities outstanding     262,400,000              
Unsecured Bilateral Facility | Credit Suisse (Switzerland) Ltd. | Letter of Credit                    
Line of Credit Facility [Line Items]                    
Line of credit facility, maximum borrowing capacity         $ 200,000,000.0          
Credit facilities outstanding     185,800,000              
Debt to capital ratio             0.35      
Minimum net worth requirements             $ 3,000,000,000.0      
Secured Bilateral Facility | Letter of Credit                    
Line of Credit Facility [Line Items]                    
Credit facilities outstanding     407,407,000              
Secured Bilateral Facility | Wells Fargo | Letter of Credit                    
Line of Credit Facility [Line Items]                    
Credit facilities outstanding     111,900,000              
Secured Bilateral Facility | Citibank Europe plc | Letter of Credit                    
Line of Credit Facility [Line Items]                    
Credit facilities outstanding     295,500,000              
Renaissance Reinsurance FAL Facility | Letter of Credit                    
Line of Credit Facility [Line Items]                    
Credit facilities outstanding     225,000,000.0              
Bridge Loan | Revolving Credit Facility                    
Line of Credit Facility [Line Items]                    
Line of credit facility, maximum borrowing capacity               $ 50,000,000.0    
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     4,500,000              
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 | 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 | Renaissance Reinsurance FAL Facility | Bank of Montreal, Citibank Europe and ING Bank | Letter of Credit                    
Line of Credit Facility [Line Items]                    
Line of credit facility, maximum borrowing capacity $ 290,000,000.0     $ 225,000,000.0            
Syndicate 1458 | Letter of Credit | Renaissance Reinsurance FAL Facility | Bank of Montreal, Citibank Europe and ING Bank | Forecast                    
Line of Credit Facility [Line Items]                    
Collateral amount, percent of aggregate outstanding letters of credit in case of Full Collateralization Event   100.00%                
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