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INVESTMENTS - Amortized Cost and Fair Value of the Investment in IHAM (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Schedule of Investments [Line Items] |  |
Amortized Cost | $ 22,043.0 | $ 19,810.0
Fair Value | 21,779.8 | 20,009.5
Ivy Hill Asset Management, L.P. |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 2,048.0 | 781.0
Fair Value | 2,201.0 | 936.0
Subordinated debt |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 500.0 | 16.0
Fair Value | 500.0 | 16.0
Equity investment |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 1,548.0 | 765.0
Fair Value | $ 1,701.0 | $ 920.0

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- Definition 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 -Subparagraph (b) -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 -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column C)) -URI https://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010 + Details
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