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Deferred Acquisition Costs and Other Actuarial Balances - Disaggregated DAC amounts (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Deferred Acquisition Costs |  |  |
Deferred acquisition costs | $ 4,057.3 | $ 4,006.9 |
Short-duration contracts |  |  |
Deferred Acquisition Costs |  |  |
Deferred acquisition costs | 34.5 | 30.6 |
Other balances |  |  |
Deferred Acquisition Costs |  |  |
Deferred acquisition costs | 1.2 | 5.9 |
Retirement and Income Solutions |  |  |
Deferred Acquisition Costs |  |  |
Deferred acquisition costs | 1,000.4 | 957.2 |
Retirement and Income Solutions | Workplace savings and retirement solutions |  |  |
Deferred Acquisition Costs |  |  |
Deferred acquisition costs | 525.0 | 515.5 | $ 506.4
Retirement and Income Solutions | Individual variable annuities |  |  |
Deferred Acquisition Costs |  |  |
Deferred acquisition costs | 368.6 | 323.4 | 279.5
Retirement and Income Solutions | Pension risk transfer |  |  |
Deferred Acquisition Costs |  |  |
Deferred acquisition costs | 23.8 | 21.1 | 15.4
Retirement and Income Solutions | Individual fixed deferred annuities |  |  |
Deferred Acquisition Costs |  |  |
Deferred acquisition costs | 71.1 | 84.2 | 106.1
Retirement and Income Solutions | Investment only |  |  |
Deferred Acquisition Costs |  |  |
Deferred acquisition costs | 11.9 | 13.0 | 11.5
Benefits and Protection |  |  |
Deferred Acquisition Costs |  |  |
Deferred acquisition costs | 3,021.2 | 3,013.2 |
Benefits and Protection | Life Insurance | Universal life |  |  |
Deferred Acquisition Costs |  |  |
Deferred acquisition costs excluding short-duration contracts and other balances | 1,517.8 | 1,527.7 | 1,545.3
Benefits and Protection | Life Insurance | Term life |  |  |
Deferred Acquisition Costs |  |  |
Deferred acquisition costs excluding short-duration contracts and other balances | 720.0 | 710.8 | 695.1
Benefits and Protection | Life Insurance | Participating life |  |  |
Deferred Acquisition Costs |  |  |
Deferred acquisition costs excluding short-duration contracts and other balances | 72.8 | 77.8 | 84.7
Benefits and Protection | Specialty Benefits | Individual disability |  |  |
Deferred Acquisition Costs |  |  |
Deferred acquisition costs excluding short-duration contracts and other balances | $ 710.6 | $ 696.9 | $ 667.7

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