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Deferred Acquisition Costs and Other Actuarial Balances - Disaggregated DAC amounts (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Deferred Acquisition Costs |  |  |  |
Deferred acquisition costs | $ 3,948.4 | $ 3,948.0 |  | $ 3,822.3
Short-duration contracts |  |  |  |
Deferred Acquisition Costs |  |  |  |
Deferred acquisition costs | 34.2 | 34.7 |  |
Other balances |  |  |  |
Deferred Acquisition Costs |  |  |  |
Deferred acquisition costs | 7.7 | 8.8 |  |
Retirement and Income Solutions |  |  |  |
Deferred Acquisition Costs |  |  |  |
Deferred acquisition costs | 920.5 | 930.0 |  | 964.4
Retirement and Income Solutions | Workplace savings and retirement solutions |  |  |  |
Deferred Acquisition Costs |  |  |  |
Deferred acquisition costs | 504.1 | 498.0 | $ 489.0 | 477.2
Retirement and Income Solutions | Individual variable annuities |  |  |  |
Deferred Acquisition Costs |  |  |  |
Deferred acquisition costs | 277.7 | 278.0 | 281.2 | 281.9
Retirement and Income Solutions | Pension risk transfer |  |  |  |
Deferred Acquisition Costs |  |  |  |
Deferred acquisition costs | 13.8 | 8.1 | 2.7 |
Retirement and Income Solutions | Individual fixed deferred annuities |  |  |  |
Deferred Acquisition Costs |  |  |  |
Deferred acquisition costs | 112.2 | 131.0 | 162.2 | 192.7
Retirement and Income Solutions | Investment only |  |  |  |
Deferred Acquisition Costs |  |  |  |
Deferred acquisition costs | 12.7 | 14.9 | 18.1 | 12.6
Benefits and Protection |  |  |  |
Deferred Acquisition Costs |  |  |  |
Deferred acquisition costs | 2,986.0 | 2,974.5 |  | 2,857.9
Benefits and Protection | Life Insurance | Universal life |  |  |  |
Deferred Acquisition Costs |  |  |  |
Deferred acquisition costs | 1,549.3 | 1,569.7 | 1,596.2 | 1,608.3
Benefits and Protection | Life Insurance | Term life |  |  |  |
Deferred Acquisition Costs |  |  |  |
Deferred acquisition costs | 692.1 | 685.7 | 678.9 | 607.9
Benefits and Protection | Life Insurance | Participating life |  |  |  |
Deferred Acquisition Costs |  |  |  |
Deferred acquisition costs | 86.6 | 93.0 | 102.3 | 111.9
Benefits and Protection | Specialty Benefits | Individual disability |  |  |  |
Deferred Acquisition Costs |  |  |  |
Deferred acquisition costs | $ 658.0 | $ 626.1 | $ 580.7 | $ 529.8

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