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FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details) $ in Millions	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	$ 21,148.0	$ 21,779.8
Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	20,683.0	21,361.0
Level 3 | Yield analysis | First lien senior secured loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	8,368.0	9,165.0
Level 3 | Yield analysis | Second lien senior secured loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	3,802.0	3,841.0
Level 3 | Yield analysis | Senior subordinated loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	1,040.0	1,021.0
Level 3 | Discounted cash flow analysis | Subordinated certificates of the SDLP
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	1,231.0	1,249.0
Level 3 | Discounted cash flow analysis | Ivy Hill Asset Management, L.P.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	2,295.0	2,201.0
Level 3 | EV market multiple analysis | Preferred equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	2,069.0	2,023.0
Level 3 | EV market multiple analysis | Other equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	$ 1,878.0	$ 1,861.0
Level 3 | Market yield | Yield analysis | Minimum | First lien senior secured loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable Input	3.7	7.6
Level 3 | Market yield | Yield analysis | Minimum | Second lien senior secured loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable Input	11.4	11
Level 3 | Market yield | Yield analysis | Minimum | Senior subordinated loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable Input	9.5	8
Level 3 | Market yield | Yield analysis | Maximum | First lien senior secured loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable Input	29.5	26.1
Level 3 | Market yield | Yield analysis | Maximum | Second lien senior secured loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable Input	42.9	32.4
Level 3 | Market yield | Yield analysis | Maximum | Senior subordinated loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable Input	17.6	16.3
Level 3 | Market yield | Yield analysis | Weighted Average | First lien senior secured loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable Input	12.6	12.3
Level 3 | Market yield | Yield analysis | Weighted Average | Second lien senior secured loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable Input	15.2	14.9
Level 3 | Market yield | Yield analysis | Weighted Average | Senior subordinated loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable Input	14.1	12.9
Level 3 | Discount rate | Discounted cash flow analysis | Minimum | Subordinated certificates of the SDLP
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable Input	12.8	12.4
Level 3 | Discount rate | Discounted cash flow analysis | Minimum | Ivy Hill Asset Management, L.P.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable Input	13.1	12.9
Level 3 | Discount rate | Discounted cash flow analysis | Maximum | Subordinated certificates of the SDLP
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable Input	15	14.8
Level 3 | Discount rate | Discounted cash flow analysis | Maximum | Ivy Hill Asset Management, L.P.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable Input	20.6	25.7
Level 3 | Discount rate | Discounted cash flow analysis | Weighted Average | Subordinated certificates of the SDLP
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable Input	13.5	13.5
Level 3 | Discount rate | Discounted cash flow analysis | Weighted Average | Ivy Hill Asset Management, L.P.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable Input	14.8	14.2
Level 3 | EBITDA multiple | EV market multiple analysis | Minimum | Preferred equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable Input	2.5	2.6
Level 3 | EBITDA multiple | EV market multiple analysis | Minimum | Other equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable Input	2.4	2.1
Level 3 | EBITDA multiple | EV market multiple analysis | Maximum | Preferred equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable Input	40	40.6
Level 3 | EBITDA multiple | EV market multiple analysis | Maximum | Other equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable Input	51.9	52.1
Level 3 | EBITDA multiple | EV market multiple analysis | Weighted Average | Preferred equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable Input	16.0	15.7
Level 3 | EBITDA multiple | EV market multiple analysis | Weighted Average | Other equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable Input	17.4	15.6

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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.

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