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DERIVATIVE INSTRUMENTS - Narrative (Details) - Derivative instruments not designated as hedges - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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Interest rate futures | Long |  |
Derivative [Line Items] |  |
Notional amount | $ 2,700.0 | $ 2,400.0
Interest rate futures | Short |  |
Derivative [Line Items] |  |
Notional amount | 1,000.0 | 500.0
Foreign currency forward contracts, underwriting and non-investment operations | Long |  |
Derivative [Line Items] |  |
Notional amount | 821.0 | 861.7
Foreign currency forward contracts, underwriting and non-investment operations | Short |  |
Derivative [Line Items] |  |
Notional amount | 262.1 | 172.4
Foreign currency forward contracts, investment operations | Long |  |
Derivative [Line Items] |  |
Notional amount | 416.3 | 225.6
Foreign currency forward contracts, investment operations | Short |  |
Derivative [Line Items] |  |
Notional amount | 161.3 | 86.3
Credit default swaps | Long |  |
Derivative [Line Items] |  |
Notional amount | 13.4 | 953.4
Credit default swaps | Short |  |
Derivative [Line Items] |  |
Notional amount | 1,300.0 | 13.1
Equity futures | Long |  |
Derivative [Line Items] |  |
Notional amount |  | $ 116.0
Equity futures | Short |  |
Derivative [Line Items] |  |
Notional amount | $ 108.2 |

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