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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fixed Indexed Annuity Insurance Liability (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Policyholder Account Balance [Line Items] |  |
Total fixed indexed annuity insurance liabilities | $ 10,465.8 | $ 9,678.6
Fixed Indexed Annuity |  |
Policyholder Account Balance [Line Items] |  |
Host contract liability | 8,972.6 | 8,301.9
Embedded derivatives at fair value | $ 1,493.2 | $ 1,376.7

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