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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fixed Indexed Annuity Insurance Liability (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jan. 01, 2021
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Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances | $ 15,481.8 | $ 15,234.2 | $ 15,079.7 | $ 12,367.7
Total fixed indexed annuity insurance liabilities | 9,497.9 | 9,153.4 |  |
Fixed Indexed Annuity |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances | 9,960.6 | 9,644.8 |  |
Future policy benefits | $ (462.7) | $ (491.4) |  |

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- Definition Liability for Future Policy Benefits, Adjusted, Net + References No definition available. + Details
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