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DERIVATIVE INSTRUMENTS - Narrative (Details) - Not Designated as Hedging Instrument - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
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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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-Paragraph 1A
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