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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revision of Prior Period Amounts (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Market Risk Benefit [Line Items] |  |  |
Decrease to market risk benefit | $ 0.0 | $ 0.0 |
Market risk benefit liability | 60.0 | 117.1 |
Policyholder account balance | (17,615.8) | (15,222.5) |
Insurance policy benefits | 2,471.9 | 2,331.1 | $ 1,616.7
Decreased insurance policy benefits | (60.5) | (34.2) | (141.5)
Net liability for future policy benefits | $ 11,705.5 | 12,188.4 |
Market Risk Benefits | Restatement Adjustment |  |  |
Market Risk Benefit [Line Items] |  |  |
Decrease to market risk benefit |  | (75.4) |
Market risk benefit liability |  | 109.7 |
Policyholder account balance |  | 185.1 |
Insurance policy benefits |  | 12.9 | 1.3
Decreased insurance policy benefits |  | 12.9 | $ 1.3
Embedded Derivatives | Restatement Adjustment |  |  |
Market Risk Benefit [Line Items] |  |  |
Policyholder account balance |  | 260.2 |
Net liability for future policy benefits |  | $ 260.2 |

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