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DERIVATIVE INSTRUMENTS - Narrative (Details) - Derivative instruments not designated as hedges - USD ($) | Sep. 30, 2025 | Dec. 31, 2024
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Interest rate futures | Long |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 6,900,000,000 | $ 7,100,000,000
Interest rate futures | Short |  |
Derivative [Line Items] |  |
Derivative, notional amount | 3,400,000,000 | 3,100,000,000
Foreign currency forward contracts, underwriting and non-investment operations | Long |  |
Derivative [Line Items] |  |
Derivative, notional amount | 941,400,000 | 1,000,000,000.0
Foreign currency forward contracts, underwriting and non-investment operations | Short |  |
Derivative [Line Items] |  |
Derivative, notional amount | 168,800,000 | 508,800,000
Foreign currency forward contracts, investment operations | Long |  |
Derivative [Line Items] |  |
Derivative, notional amount | 428,500,000 | 345,000,000.0
Foreign currency forward contracts, investment operations | Short |  |
Derivative [Line Items] |  |
Derivative, notional amount | 120,000,000.0 | 107,000,000.0
Credit default swaps | Long |  |
Derivative [Line Items] |  |
Derivative, notional amount | 845,700,000 | 1,400,000,000
Equity futures | Long |  |
Derivative [Line Items] |  |
Derivative, notional amount | 1,300,000,000 | 437,200,000
Commodity futures | Long |  |
Derivative [Line Items] |  |
Derivative, notional amount | 1,100,000,000 | 684,300,000
Commodity options | Long |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 0 | $ 500,000

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