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Credit Facilities (Narrative) (Details) - USD ($) |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
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 |  |  |  |

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