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Contractholder Funds (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Contract holder Funds |  |  |
Total policyholder account balances for contracts with significant insurance risk or investment contracts with significant fee revenue | $ 25,488.8 | $ 26,349.6 |
Investment contracts without significant fee revenue | 16,453.4 | 16,104.0 |
Embedded derivatives | 78.8 | 46.4 |
Other balances | 282.9 | 325.3 |
Total contract holder funds per consolidated statements of financial position | 42,303.9 | 42,825.3 |
Retirement and Income Solutions |  |  |
Contract holder Funds |  |  |
Total policyholder account balances for contracts with significant insurance risk or investment contracts with significant fee revenue | 18,957.1 | 19,764.4 |
Retirement and Income Solutions | Workplace savings and retirement solutions |  |  |
Contract holder Funds |  |  |
Total policyholder account balances for contracts with significant insurance risk or investment contracts with significant fee revenue | 12,571.2 | 12,154.7 | $ 10,996.2
Retirement and Income Solutions | Individual variable annuities |  |  |
Contract holder Funds |  |  |
Total policyholder account balances for contracts with significant insurance risk or investment contracts with significant fee revenue | 436.6 | 381.4 | 380.9
Retirement and Income Solutions | Individual fixed deferred annuities |  |  |
Contract holder Funds |  |  |
Total policyholder account balances for contracts with significant insurance risk or investment contracts with significant fee revenue | 5,949.3 | 7,228.3 | 9,646.3
Benefits and Protection | Life Insurance | Universal life |  |  |
Contract holder Funds |  |  |
Total policyholder account balances for contracts with significant insurance risk or investment contracts with significant fee revenue | 6,888.1 | 6,947.9 | $ 6,962.5
Corporate | Inter-segment eliminations |  |  |
Contract holder Funds |  |  |
Total policyholder account balances for contracts with significant insurance risk or investment contracts with significant fee revenue | $ (356.4) | $ (362.7) |

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