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FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Significant Unobservable Inputs (Details) $ in Millions | Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
--- | --- | ---
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | $ 21,928.5 | $ 21,779.8
Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 21,198.0 | 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 | 9,003.0 | 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 | 3,561.0 | 3,841.0
Level 3 | Yield analysis | Senior subordinated loans |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 997.0 | 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 | 1,216.0 | 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 | 2,020.0 | 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 | 2,343.0 | 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 | $ 2,058.0 | $ 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 | 7.4 | 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 | 10 | 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 | 8 | 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 | 25.3 | 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 | 22.1 | 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 | 18.2 | 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 | 12.7 | 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 | 14.6 | 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 | 14.7 | 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 | 12.6 | 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 | 12.9 | 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 | 14.9 | 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 | 31.4 | 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 | 14.6 | 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 | 4.7 | 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 | 4.8 | 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 | 32.7 | 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 | 16.5 | 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 | 14.3 | 15.6

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