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Credit Facilities (Narrative) (Details)
£ in Thousands
 12 Months Ended
May 26, 2016
USD ($)
Jun. 22, 2012
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2021
GBP (£)
Dec. 31, 2021
USD ($)
May 05, 2021
USD ($)
Feb. 23, 2021
USD ($)
Dec. 31, 2020
GBP (£)
Dec. 31, 2020
USD ($)
Line of Credit Facility [Line Items]                    
Line of credit facility, commitment           $ 1,200,000,000        
Uncommitted amount available           340,000,000.0        
Borrowings from FHLB           519,000,000       $ 310,000,000
Wells Fargo Bank Group Credit Facility [Member]                    
Line of Credit Facility [Line Items]                    
Line of credit facility, term of credit facility 5 years 4 years                
Line of credit facility, commitment $ 800,000,000.0 $ 800,000,000.0       39,198,000       800,000,000
Bermuda Re Wells Fargo Bank Bilateral Letter of Credit Facility [Member]                    
Line of Credit Facility [Line Items]                    
Line of credit facility, expiration date     Dec. 30, 2022              
Line of credit facility, commitment           500,000,000 $ 500,000,000.0 $ 50,000,000.0    
Bermuda Re Citibank LOC Facility [Member]                    
Line of Credit Facility [Line Items]                    
Line of credit facility, commitment           370,000,000       200,000,000
Uncommitted amount available           140,000,000.0        
Bermuda Re Citibank Letter of Credit Facility One [Member]                    
Line of Credit Facility [Line Items]                    
Line of credit facility, expiration date     Feb. 28, 2022 Feb. 28, 2021            
Line of credit facility, commitment           230,000,000       $ 200,000,000
Everest International Credit Facility [Member]                    
Line of Credit Facility [Line Items]                    
Line of credit facility, expiration date       Dec. 31, 2024            
Line of credit facility, commitment | £               £ 52,175  
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              
Line of credit facility, commitment           200,000,000.0        
Bermuda Re Lloyd's Bank Credit Facility [Member]                    
Line of Credit Facility [Line Items]                    
Line of credit facility, expiration date     Dec. 31, 2022              
Line of credit facility, commitment           50,000,000        
Uncommitted amount available           250,000,000.0        
Bermuda Re Barclays Bilateral Letter of Credit Facility [Member]                    
Line of Credit Facility [Line Items]                    
Line of credit facility, expiration date     Dec. 31, 2022              
Line of credit facility, commitment           $ 200,000,000        
Federal Home Loan Bank Of New York [Member]                    
Line of Credit Facility [Line Items]                    
Maximum percentage of admitted assets allowed for borrowing base         10.00% 10.00%        
Admitted assets for FHLB           $ 20,300,000,000        
Maximum amount available under FHLB           2,000,000,000.0        
Borrowings from FHLB           $ 519,000,000.0        
Amount of borrowed funds required to be used to acquire additional membership stock, percentage     4.50%              
Interest expense incurred     $ 1,200,000 $ 200,000            
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