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LIABILITIES FOR INSURANCE PRODUCTS - Fixed Indexed Annuity Insurance Liability (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023
--- | --- | --- | ---
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balances | $ 16,637.9 | $ 15,667.8 | $ 15,387.7
Total fixed indexed annuity insurance liabilities | 10,171.4 | 9,863.7 |
Fixed Indexed Annuity |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balances | 10,409.5 | 10,138.6 |
Future policy benefits | $ (238.1) | $ (274.9) |

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