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INVESTMENTS - Schedule of Investments (Details) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 USD ($) borrower | Dec. 31, 2021 USD ($) borrower
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 21,468.5 | $ 19,810.0
Fair Value | $ 21,338.5 | $ 20,009.5
Loans on non-accrual status, as a percent of total investments at amortized cost | 1.60% | 0.80%
Loans on non-accrual status, as a percent of total investments at fair value | 0.90% | 0.50%
Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 100.00% | 100.00%
Investments, At Fair Value | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 100.00% | 100.00%
Senior Direct Lending Program |  |
Schedule of Investments [Line Items] |  |
Number of borrowers | borrower | 21 | 19
West | Investments, At Fair Value | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 34.50% | 31.20%
West | Senior Direct Lending Program | Investments, At Fair Value | Customer Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 5.30% | 4.90%
Midwest | Investments, At Fair Value | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 25.00% | 27.90%
Southeast | Investments, At Fair Value | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 17.80% | 17.20%
Mid-Atlantic | Investments, At Fair Value | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 13.10% | 14.50%
Northeast | Investments, At Fair Value | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 4.60% | 4.80%
International | Investments, At Fair Value | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 5.00% | 4.40%
Software & Services |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 4,924.8 | $ 4,308.2
Fair Value | $ 4,816.4 | $ 4,378.1
Software & Services | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 22.50% | 21.90%
Diversified Financials |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 2,512.7 | $ 1,363.8
Fair Value | $ 2,631.3 | $ 1,505.3
Diversified Financials | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 12.30% | 7.50%
Health Care Services |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 2,231.9 | $ 2,133.9
Fair Value | $ 2,155.8 | $ 2,157.1
Health Care Services | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 10.10% | 10.80%
Commercial & Professional Services |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 1,768.3 | $ 1,820.0
Fair Value | $ 1,746.8 | $ 1,833.4
Commercial & Professional Services | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 8.20% | 9.20%
Investment Funds and Vehicles |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 1,152.9 | $ 1,020.0
Fair Value | $ 1,166.2 | $ 1,032.4
Investment Funds and Vehicles | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 5.50% | 5.20%
Insurance Services |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 1,101.3 | $ 1,144.0
Fair Value | $ 1,081.3 | $ 1,167.3
Insurance Services | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 5.10% | 5.80%
Power Generation |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 953.2 | $ 877.8
Fair Value | $ 1,007.2 | $ 898.9
Power Generation | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 4.70% | 4.50%
Consumer Services | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 4.00% | 3.90%
Capital Goods |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 818.9 | $ 945.3
Fair Value | $ 854.0 | $ 957.0
Capital Goods | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 4.00% | 4.80%
Consumer Durables & Apparel |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 925.8 | $ 918.7
Fair Value | $ 838.8 | $ 874.4
Consumer Durables & Apparel | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 3.90% | 4.40%
Automobiles & Components |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 736.4 | $ 933.1
Fair Value | $ 674.5 | $ 910.5
Automobiles & Components | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 3.20% | 4.60%
Food & Beverage |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 508.5 | $ 446.6
Fair Value | $ 508.8 | $ 445.3
Food & Beverage | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 2.40% | 2.20%
Pharmaceuticals, Biotechnology & Life Sciences |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 465.3 | $ 394.2
Fair Value | $ 490.1 | $ 386.8
Pharmaceuticals, Biotechnology & Life Sciences | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 2.30% | 1.90%
Retailing and Distribution | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 2.20% | 2.80%
Media & Entertainment |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 442.2 | $ 434.7
Fair Value | $ 468.8 | $ 448.2
Media & Entertainment | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 2.20% | 2.20%
Other | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 7.40% | 8.30%
First lien senior secured loans |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 9,821.0 | $ 9,583.0
Fair Value | 9,509.0 | 9,459.0
Second lien senior secured loans |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 4,011.0 | 4,614.0
Fair Value | 3,797.0 | 4,524.0
Subordinated certificates of the SDLP |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 1,121.0 | 987.0
Fair Value | 1,121.0 | 987.0
Senior subordinated loans |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 1,102.0 | 896.0
Fair Value | 1,051.0 | 890.0
Preferred equity |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 2,071.0 | 1,547.0
Fair Value | 2,052.0 | 1,561.0
Ivy Hill Asset Management, L.P. |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 1,809.0 | 781.0
Fair Value | 1,958.0 | 936.0
Other equity |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 1,534.0 | 1,402.0
Fair Value | 1,851.0 | 1,652.0
Unitranche loans |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 5,127.0 | 5,210.0
Fair Value | $ 4,998.0 | $ 5,163.0

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