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Credit Facilities (Narrative) (Details) - USD ($)			3 Months Ended		6 Months Ended		12 Months Ended
Credit Facilities (Narrative) (Details) - USD ($)	May 26, 2016	Jun. 22, 2012	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 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			$ 340,000,000.0		$ 340,000,000.0
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
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
Wells Fargo Bank Group Credit Facility Tranche One [Member]
Line of Credit Facility [Line Items]
Line of credit facility, expiration date							Dec. 30, 2022
Line of credit facility, commitment							$ 39,198,000
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		Dec. 30, 2022
Line of credit facility, commitment			500,000,000		$ 500,000,000		$ 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		$ 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. 16, 2022		Feb. 28, 2022
Line of credit facility, commitment			230,000,000.0		$ 230,000,000.0		$ 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			200,000,000.0		$ 200,000,000.0		$ 200,000,000
Bermuda Re Lloyd's Bank Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment			250,000,000.0		$ 250,000,000.0		$ 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			50,000,000.0		$ 50,000,000.0		$ 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			200,000,000.0		$ 200,000,000.0		$ 200,000,000
Federal Home Loan Bank Of New York [Member]
Line of Credit Facility [Line Items]
Admitted assets for FHLB			20,800,000,000		20,800,000,000
Maximum amount available under FHLB			2,100,000,000		2,100,000,000
Borrowings from FHLB			519,000,000.0		$ 519,000,000.0
Amount of borrowed funds required to be used to acquire additional membership stock, percentage					4.50%
Interest expense incurred			$ 800,000	$ 300,000	$ 1,500,000	$ 600,000
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