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DERIVATIVE INSTRUMENTS - Narrative (Details) - Not Designated as Hedging Instrument - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Long | Interest rate futures |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 7,100.0 | $ 5,900.0
Long | Foreign currency forward contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 1,000.0 | 805.2
Long | Foreign currency forward contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 345.0 | 420.7
Long | Credit default swaps |  |
Derivative [Line Items] |  |
Derivative, notional amount |  | 1,500.0
Long | Equity futures |  |
Derivative [Line Items] |  |
Derivative, notional amount | 437.2 | 0.0
Long | Commodity futures |  |
Derivative [Line Items] |  |
Derivative, notional amount | 684.3 | 255.2
Long | Commodity options |  |
Derivative [Line Items] |  |
Derivative, notional amount | 0.5 | 0.4
Short | Interest rate futures |  |
Derivative [Line Items] |  |
Derivative, notional amount | 3,100.0 | 2,700.0
Short | Foreign currency forward contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 508.8 | 496.4
Short | Foreign currency forward contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 107.0 | 130.0
Short | Credit default swaps |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 1,400.0 | $ 22.1

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