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Reinsurance and Policy Provisions (AeBe) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | [2] | Oct. 03, 2022 USD ($) | Oct. 01, 2022 USD ($)
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Other liabilities | $ 1,614,479 | [1] | $ 3,172,554 | $ 1,614,479 | [1] |  |  |
Other revenue |  |  | 75,866 | 42,245 | [2] | $ 16,160 |  |
Coinsurance deposits | 13,254,956 | [1] | $ 14,582,728 | 13,254,956 | [1] |  |  |
AeBe ISA LTD |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Reinsurance liabilities, amount ceded |  |  |  |  |  |  |  | $ 4,200,000
Funds withheld coinsurance basis, percentage |  |  | 75.00% |  |  |  |  |
Coinsurance basis, percentage |  |  | 25.00% |  |  |  |  |
Closing ceding commission received at close of reinsurance agreement |  |  |  |  |  |  | $ 70,000 |
Coinsurance deposits | 4,100,000 |  | $ 3,700,000 | 4,100,000 |  |  |  |
Reinsurance recoverable |  |  | 41,600 |  |  |  |  |
Reinsurance payable | 38,000 |  |  | 38,000 |  |  |  |
Ceding commission, net present value |  |  | $ 4,600 |  |  |  |  |
AeBe ISA LTD | Maximum |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Annual ceding commission, basis points |  |  | 0.0035 |  |  |  |  |
AeBe ISA LTD | Other Liabilities, Deferred Gain |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Other liabilities | 51,600 |  | $ 61,100 | 51,600 |  |  |  |
AeBe ISA LTD | Reinsurance Contract [Axis]: AeBe ISA LTD, Coinsurance Basis |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Cash and investments transferred at close of reinsurance agreement |  |  |  |  |  |  | 1,000,000 |
AeBe ISA LTD | Reinsurance Contract [Axis]: AeBe ISA LTD, Funds Withheld Coinsurance Basis |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Cash and investments transferred at close of reinsurance agreement |  |  |  |  |  |  | $ 3,000,000 |
AeBe ISA LTD | Other Revenue, Deferred Gain |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Other revenue | 1,100 |  | 6,500 |  |  |  |  |
AeBe ISA LTD | Other Revenue, Management Services Fee |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Other revenue |  |  | 4,500 | $ 1,200 |  |  |  |
26North |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Net investment income earned by assets in funds withheld account | $ 42,300 |  | $ 176,200 |  |  |  |  |
[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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