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Reinsurance and Policy Provisions (North End Re) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2021 USD ($) | Sep. 30, 2023 | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jan. 31, 2022 | Oct. 08, 2021 USD ($) | Jul. 01, 2021 USD ($)
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other revenue |  |  |  | $ 75,866 | $ 42,245 | [1] | $ 16,160 | [1] |  |  |
Other liabilities | $ 3,172,554 |  |  | 3,172,554 | 1,614,479 | [2] |  |  |  |  |
Coinsurance deposits | $ 14,582,728 |  |  | $ 14,582,728 | 13,254,956 | [2] |  |  |  |  |
Third party ownership interest in Company's common stock | 20.10% |  |  | 20.10% |  |  |  |  | 16.00% |  |
North End Re, Reinsurance Agreement, In Force as of July 1, 2021 |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reinsurance liabilities, amount ceded |  |  |  |  |  |  |  |  |  |  | $ 4,400,000
Modified coinsurance basis, percentage |  |  |  | 70.00% |  |  |  |  |  |  |
Coinsurance basis, percentage |  |  |  | 30.00% |  |  |  |  |  |  |
Annual ceding commission, basis points | 0.0049 |  |  | 0.0049 |  |  |  |  |  |  |
Annual asset liability management fee, basis points | 0.0030 |  |  | 0.0030 |  |  |  |  |  |  |
Ceding commission, net present value |  | $ 114,100 |  |  |  |  |  |  |  |  |
North End Re, Reinsurance Agreement, In Force as of July 1, 2021 | Minimum |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contractually guaranteed fees, duration |  |  |  | 6 years |  |  |  |  |  |  |
North End Re, Reinsurance Agreement, In Force as of July 1, 2021 | Maximum |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contractually guaranteed fees, duration |  |  |  | 7 years |  |  |  |  |  |  |
North End Re, Reinsurance Agreement, In Force as of July 1, 2021 | Reinsurance Contract [Axis]: North End Re, Coinsurance Basis |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash transferred at close of reinsurance agreement |  |  |  |  |  |  |  |  |  | $ 1,100,000 |
North End Re, Reinsurance Agreement, In Force as of July 1, 2021 | Reinsurance Contract [Axis]: North End Re, Modified Coinsurance Basis |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash transferred at close of reinsurance agreement |  |  |  |  |  |  |  |  |  | $ 2,600,000 |
North End Re, Reinsurance Agreement, July 1, 2021 Going Forward |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Modified coinsurance basis, percentage |  |  | 70.00% |  |  |  |  |  |  |  |
Coinsurance basis, percentage |  |  | 30.00% |  |  |  |  |  |  |  |
Annual ceding commission, basis points | 0.0140 |  |  | 0.0140 |  |  |  |  |  |  |
Annual asset liability management fee, basis points | 0.0030 |  |  | 0.0030 |  |  |  |  |  |  |
Ceding commission, net present value |  | $ 27,100 |  | $ 123,600 | 67,700 |  |  |  |  |  |
Coninsurance on certain annuities, percentage |  |  | 75.00% |  |  |  |  |  |  |  |
North End Re, Reinsurance Agreement, July 1, 2021 Going Forward | Minimum |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contractually guaranteed fees, duration |  |  |  | 6 years |  |  |  |  |  |  |
North End Re, Reinsurance Agreement, July 1, 2021 Going Forward | Maximum |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contractually guaranteed fees, duration |  |  |  | 7 years |  |  |  |  |  |  |
North End Re, Reinsurance Agreement Amendment, In Force Issued After July 1, 2021 |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Modified coinsurance basis, percentage |  |  | 70.00% |  |  |  |  |  |  |  |
Coinsurance basis, percentage |  |  | 30.00% |  |  |  |  |  |  |  |
Coninsurance on certain annuities, percentage | 0.00% |  | 75.00% |  |  |  |  |  |  |  |
Coninsurance on certain annuities, future potential | 75.00% |  |  |  |  |  |  |  |  |  |
North End Re |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net investment income earned by assets in modco account |  |  |  | $ 259,500 | 95,400 |  | 11,400 |  |  |  |
Coinsurance deposits | $ 7,500,000 |  |  | 7,500,000 | 5,800,000 |  |  |  |  |  |
Reinsurance recoverable | 32,400 |  |  | 32,400 |  |  |  |  |  |  |
Reinsurance payable |  |  |  |  | 124,200 |  |  |  |  |  |
North End Re | Other Liabilities, Deferred Gain |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other liabilities | $ 776,300 |  |  | 776,300 | 480,500 |  |  |  |  |  |
North End Re | Other Revenue, Asset Liability Management Fee |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other revenue |  |  |  | 16,800 | 12,700 |  | $ 5,500 |  |  |  |
North End Re | Other Revenue, Deferred Gain |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other revenue |  |  |  | $ 38,500 | $ 24,200 |  |  |  |  |  |
[1] | Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.
[2] | Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

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