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ACCOUNTING FOR DERIVATIVES - FAIR VALUE BY BALANCE SHEET LOCATION (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fixed indexed call options |  |
Derivatives, Fair Value [Line Items] |  |
Fixed indexed call options | $ 373.6 | $ 239.2
Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Total assets | 358.0 | 221.7
Total liabilities | 1,551.9 | 1,376.7
Not Designated as Hedging Instrument | Fixed indexed call options | Other invested assets |  |
Derivatives, Fair Value [Line Items] |  |
Fixed indexed call options | 373.6 | 239.2
Not Designated as Hedging Instrument | Reinsurance receivables | Reinsurance receivables |  |
Derivatives, Fair Value [Line Items] |  |
Reinsurance receivables | (15.6) | (17.5)
Not Designated as Hedging Instrument | Embedded derivatives related to fixed indexed annuities at fair value | Policyholder account balances |  |
Derivatives, Fair Value [Line Items] |  |
Total liabilities | 1,655.1 | 1,651.6
Not Designated as Hedging Instrument | Embedded derivatives related to fixed indexed annuities at fair value | Future policy benefits |  |
Derivatives, Fair Value [Line Items] |  |
Total liabilities | $ (103.2) | $ (274.9)

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