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INVESTMENTS - Amortized Cost and Fair Value of the Investment in IHAM (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Amortized Cost	$ 21,429.6	$ 22,043.0
Fair Value	21,148.0	21,779.8
Ivy Hill Asset Management, L.P.
Schedule of Investments [Line Items]
Amortized Cost	2,139.0	2,048.0
Fair Value	2,295.0	2,201.0
Subordinated loan
Schedule of Investments [Line Items]
Amortized Cost	438.0	500.0
Fair Value	438.0	500.0
Equity
Schedule of Investments [Line Items]
Amortized Cost	1,701.0	1,548.0
Fair Value	$ 1,857.0	$ 1,701.0

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- Definition

Cost of the investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841

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Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
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-URI https://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 5D
-Subparagraph (SX 210.12-13D(Column C))
-URI https://asc.fasb.org/extlink&oid=122147990&loc=SL120429264-123010

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 946
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