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INVESTMENTS IN VARIABLE INTEREST ENTITIES - NARRATIVE (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) investment | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) investment | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |
Total amortized cost | $ 298.6 |  | $ 298.6 |  |
Variable interest entity, gross unrealized gains fixed maturity securities | 0.5 |  | 0.5 |  |
Variable interest entity gross unrealized losses fixed maturity securities | 1.8 |  | 1.8 |  |
Variable interest entity, allowance for credit losses fixed maturity securities | 0.5 |  | 0.5 |  |
Estimated fair value of fixed maturity securities | 296.8 |  | 296.8 |  |
Variable interest entities net realized gain (losses) on investments |  |  | (6.1) | $ (12.5) |
Variable interest entities net loss from sale of fixed maturity investments |  |  | (6.9) | (17.7) |
Variable interest entities, change in allowance for current expected credit losses |  |  | (0.8) | (1.3) |
Variable interest entity, gross investment losses |  |  | 7.3 | 18.9 |
Variable interest entities, investments sold |  |  | 88.2 | 176.9 |
Gain on liquidation of variable interest entities | $ 0.0 | $ 0.1 | $ 0.0 | $ 3.9 |
Number of investments held by VIE, in default | investment | 0 |  | 0 |  |
Fair value of investments in unrealized loss position for less than 12 months | $ 1,019.0 |  | $ 1,019.0 |  | $ 2,982.1
Gross unrealized losses of investments in unrealized loss position for less than 12 months | 10.9 |  | 10.9 |  | 70.6
Fair value of investments in unrealized loss position for more than 12 months | 6,920.8 |  | 6,920.8 |  | 8,482.0
Gross unrealized losses of investments in unrealized loss position for more than 12 months | 873.1 |  | 873.1 |  | 1,357.8
Investments held in limited partnerships | 598.3 |  | 598.3 |  |
Unfunded commitments to limited partnerships | 639.4 |  | 639.4 |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Fair value of investments in unrealized loss position for less than 12 months | 169.5 |  | 169.5 |  | 183.2
Gross unrealized losses of investments in unrealized loss position for less than 12 months | $ 1.4 |  | $ 1.4 |  | 0.9
Fair value of investments in unrealized loss position for more than 12 months |  |  |  |  | 25.6
Gross unrealized losses of investments in unrealized loss position for more than 12 months |  |  |  |  | $ 0.3

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