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FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details) $ in Millions | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
--- | --- | ---
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | $ 21,779.8 | $ 20,009.5
Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 21,361.0 | 19,908.0
Level 3 | Yield analysis | First lien senior secured loans |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 9,165.0 | 9,456.0
Level 3 | Yield analysis | Second lien senior secured loans |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 3,841.0 | 4,432.0
Level 3 | Yield analysis | Senior subordinated loans |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 1,021.0 | 889.0
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 | 1,249.0 | 987.0
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 | 2,201.0 | 936.0
Level 3 | EV market multiple analysis | Preferred equity |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 2,023.0 | 1,561.0
Level 3 | EV market multiple analysis | Other equity |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | $ 1,861.0 | $ 1,647.0
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 | 7.6 | 2
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 | 6.8
Level 3 | Market yield | Yield analysis | Minimum | Senior subordinated loans |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Unobservable Input | 8 | 7.1
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 | 26.1 | 16.5
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 | 32.4 | 22.9
Level 3 | Market yield | Yield analysis | Maximum | Senior subordinated loans |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Unobservable Input | 16.3 | 27.8
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 | 12.3 | 7.6
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 | 14.9 | 9.5
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 | 12.9 | 11.5
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 | 12.4 | 8.8
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 | 12.9 | 9.9
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 | 14.8 | 9.7
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 | 25.7 | 27.9
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 | 9.3
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 | 14.2 | 16.3
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 | 2.6 | 3.2
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 | 2.1 | 4.9
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 | 40.6 | 64.4
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 | 52.1 | 32.1
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 | 15.7 | 16.5
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 | 15.6 | 14.9

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