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INVESTMENTS IN VARIABLE INTEREST ENTITIES - NARRATIVE (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 USD ($) investment | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) investment | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |
Total amortized cost | $ 440.6 |  | $ 440.6 |  |
Variable interest entity, gross unrealized gains fixed maturity securities | 1.3 |  | 1.3 |  |
Variable interest entity gross unrealized losses fixed maturity securities | (13.6) |  | (13.6) |  |
Variable interest entity, allowance for credit losses fixed maturity securities | 2.8 |  | 2.8 |  |
Estimated fair value of fixed maturity securities | 425.5 |  | 425.5 |  |
Variable interest entities net realized gain (losses) on investments |  |  | (5.7) | $ (4.0) |
Variable interest entities net loss from sale of fixed maturity investments |  |  | (9.8) | (5.0) |
Gain on liquidation of variable interest entity | 0.0 | $ 0.0 | 3.8 | 0.0 |
Variable interest entities, change in allowance for current expected credit losses | $ (1.5) | $ 1.0 | (0.3) | (1.0) |
Variable interest entity, gross investment losses |  |  | 10.6 | 5.2 |
Variable interest entities, investments sold |  |  | $ 103.1 | $ 11.0 |
Number of investments held by VIE, in default | investment | 0 |  | 0 |  |
Fair value of investments in unrealized loss position for less than 12 months | $ 2,246.0 |  | $ 2,246.0 |  | $ 1,169.9
Gross unrealized losses of investments in unrealized loss position for less than 12 months | 28.7 |  | 28.7 |  | 24.5
Fair value of investments in unrealized loss position for more than 12 months | 10,191.3 |  | 10,191.3 |  | 10,886.4
Gross unrealized losses of investments in unrealized loss position for more than 12 months | 1,403.7 |  | 1,403.7 |  | 1,365.0
Investments held in limited partnerships | 477.8 |  | 477.8 |  |
Unfunded commitments to limited partnerships | 398.1 |  | 398.1 |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Fair value of investments in unrealized loss position for less than 12 months | 56.6 |  | 56.6 |  | 24.8
Gross unrealized losses of investments in unrealized loss position for less than 12 months | 0.3 |  | 0.3 |  | 0.1
Fair value of investments in unrealized loss position for more than 12 months | 89.6 |  | 89.6 |  | 302.3
Gross unrealized losses of investments in unrealized loss position for more than 12 months | $ 2.2 |  | $ 2.2 |  | $ 8.7

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