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BUSINESS, BASIS OF PRESENTATION, AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Market Risk Benefit [Line Items] |  |  |  |  |  |
Goodwill | $ 69.5 |  |  | $ 69.5 |  |
Intangible assets | 27.2 |  |  | 27.2 |  |
Goodwill and other asset impairment | 96.7 |  | $ 0.0 | 96.7 | $ 0.0 |
Change in fair value of market risk benefits | $ 12.4 |  | 20.9 | $ 8.0 | 45.6 |
Overstatement of embedded derivative |  | $ 31.7 |  |  |  | $ 21.6
Fixed maturities, available for sale, fair value, decrease |  |  |  |  |  | 110.4
Investments held by variable interest entities increased |  |  |  |  |  | $ 1.5
Market Risk Benefits | Adjustments |  |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |  |
Change in fair value of market risk benefits |  |  | $ (4.8) |  | $ (15.6) |

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