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Credit Facilities (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
May 05, 2021
Feb. 23, 2021
Line of Credit Facility [Line Items]              
Line of credit facility, commitment $ 1,200,000,000   $ 1,200,000,000        
Uncommitted amount available $ 340,000,000   $ 340,000,000        
Maximum percentage of admitted assets allowed for borrowing base 10.00%   10.00%        
Borrowings from FHLB $ 519,000,000   $ 519,000,000   $ 519,000,000    
Bermuda Re Wells Fargo Bank Bilateral Letter of Credit Facility [Member]              
Line of Credit Facility [Line Items]              
Line of credit facility, commitment 500,000,000   500,000,000   500,000,000 $ 500,000,000 $ 50,000,000
Bermuda Re Citibank LOC Facility [Member]              
Line of Credit Facility [Line Items]              
Line of credit facility, commitment 370,000,000   $ 370,000,000   $ 370,000,000    
Bermuda Re Citibank Letter of Credit Facility One [Member]              
Line of Credit Facility [Line Items]              
Line of credit facility, expiration date     Dec. 31, 2022   Feb. 28, 2022    
Line of credit facility, commitment 230,000,000   $ 230,000,000   $ 230,000,000    
Bermuda Re Citibank LOC Facility - Uncommitted [Member]              
Line of Credit Facility [Line Items]              
Line of credit facility, expiration date     Dec. 31, 2022   Dec. 31, 2022    
Line of credit facility, commitment 140,000,000   $ 140,000,000   $ 140,000,000    
Bermuda Re Bayerische Landesbank Bilateral Letter of Credit Facility [Member]              
Line of Credit Facility [Line Items]              
Line of credit facility, expiration date     Dec. 31, 2022   Dec. 31, 2022    
Line of credit facility, commitment 200,000,000   $ 200,000,000   $ 200,000,000    
Bermuda Re Lloyd's Bank Credit Facility [Member]              
Line of Credit Facility [Line Items]              
Line of credit facility, commitment 250,000,000   $ 250,000,000   $ 50,000,000    
Bermuda Re Lloyd's Bank Credit Facility One [Member]              
Line of Credit Facility [Line Items]              
Line of credit facility, expiration date     Dec. 31, 2022   Dec. 31, 2022    
Line of credit facility, commitment 50,000,000   $ 50,000,000   $ 50,000,000    
Bermuda Re Barclays Bilateral Letter of Credit Facility [Member]              
Line of Credit Facility [Line Items]              
Line of credit facility, expiration date     Dec. 31, 2022   Dec. 31, 2022    
Line of credit facility, commitment 200,000,000   $ 200,000,000   $ 200,000,000    
Federal Home Loan Bank Of New York [Member]              
Line of Credit Facility [Line Items]              
Admitted assets for FHLB 22,000,000,000.0   22,000,000,000.0        
Maximum amount available under FHLB 2,200,000,000   2,200,000,000        
Borrowings from FHLB 519,000,000   $ 519,000,000        
Amount of borrowed funds required to be used to acquire additional membership stock, percentage     4.50%        
Interest expense incurred $ 800,000 $ 300,000 $ 2,300,000 $ 800,000      
Federal Home Loan Bank Of New York [Member] | Minimum [Member]              
Line of Credit Facility [Line Items]              
FHLB advance interest rate 0.53%   0.53%        
FHLB advance maturity     Nov. 30, 2021        
Federal Home Loan Bank Of New York [Member] | Maximum [Member]              
Line of Credit Facility [Line Items]              
FHLB advance interest rate 0.65%   0.65%        
FHLB advance maturity     Dec. 31, 2021