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LIABILITIES FOR INSURANCE PRODUCTS - RECONCILIATION OF LIABILITY FOR POLICYHOLDER ACCOUNT BALANCES (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023
--- | --- | --- | ---
Policyholder Account Balance [Line Items] |  |  |
Balance | $ 17,240.5 | $ 15,667.8 | $ 15,481.8
Fixed indexed annuities |  |  |
Policyholder Account Balance [Line Items] |  |  |
Balance | 10,594.8 |  | 9,960.6
Fixed interest annuities |  |  |
Policyholder Account Balance [Line Items] |  |  |
Balance | 2,160.4 |  | 2,234.7
Other annuities |  |  |
Policyholder Account Balance [Line Items] |  |  |
Balance | 136.0 |  | 141.4
Interest-sensitive life |  |  |
Policyholder Account Balance [Line Items] |  |  |
Balance | 1,401.1 |  | 1,344.8
Funding agreements |  |  |
Policyholder Account Balance [Line Items] |  |  |
Balance | 2,573.7 |  | 1,408.2
Other |  |  |
Policyholder Account Balance [Line Items] |  |  |
Balance | $ 374.5 |  | $ 392.1

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