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Deferred Policy Acquisition Costs - Reconciliation of DAC (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Deferred Policy Acquisition Cost [Line Items] |  |  |
Total DAC, net | $ 3,863,442 | $ 3,680,430 |
Term Life Insurance [Member] |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Total DAC, net | 3,792,788 | 3,608,599 | $ 3,366,281
Segregated Funds (Canada) [Member] |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Total DAC, net | 54,973 | 55,303 | $ 63,029
Other [Member] |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Total DAC, net | $ 15,681 | $ 16,528 |

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