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INVESTMENTS IN VARIABLE INTEREST ENTITIES - NARRATIVE (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 USD ($) investment | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) investment | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |
Total amortized cost | $ 258.8 |  | $ 258.8 |  |
Variable interest entity, gross unrealized gains fixed maturity securities | 0.7 |  | 0.7 |  |
Variable interest entity gross unrealized losses fixed maturity securities | 7.6 |  | 7.6 |  |
Variable interest entity, allowance for credit losses fixed maturity securities | 1.8 |  | 1.8 |  |
Estimated fair value of fixed maturity securities | 250.1 |  | 250.1 |  |
Variable interest entities net realized gain (losses) on investments |  |  | (12.5) | $ (4.2) |
Variable interest entities net loss from sale of fixed maturity investments |  |  | (17.7) | (6.8) |
Gain on liquidation of variable interest entities | 0.1 | $ 0.0 | 3.9 | 0.0 |
Variable interest entities, change in allowance for current expected credit losses | $ (1.0) | $ (1.6) | (1.3) | (2.6) |
Variable interest entity, gross investment losses |  |  | 18.9 | 6.9 |
Variable interest entities, investments sold |  |  | $ 176.9 | $ 18.5 |
Number of investments held by VIE, in default | investment | 0 |  | 0 |  |
Fair value of investments in unrealized loss position for less than 12 months | $ 597.9 |  | $ 597.9 |  | $ 1,169.9
Gross unrealized losses of investments in unrealized loss position for less than 12 months | 3.4 |  | 3.4 |  | 24.5
Fair value of investments in unrealized loss position for more than 12 months | 10,076.8 |  | 10,076.8 |  | 10,886.4
Gross unrealized losses of investments in unrealized loss position for more than 12 months | 1,099.3 |  | 1,099.3 |  | 1,365.0
Investments held in limited partnerships | 476.4 |  | 476.4 |  |
Unfunded commitments to limited partnerships | 416.9 |  | 416.9 |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Fair value of investments in unrealized loss position for less than 12 months | 51.7 |  | 51.7 |  | 24.8
Gross unrealized losses of investments in unrealized loss position for less than 12 months | 0.1 |  | 0.1 |  | 0.1
Fair value of investments in unrealized loss position for more than 12 months | 46.3 |  | 46.3 |  | 302.3
Gross unrealized losses of investments in unrealized loss position for more than 12 months | $ 1.1 |  | $ 1.1 |  | $ 8.7

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