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INVESTMENTS - Schedule of Investments (Details) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 USD ($) borrower | Dec. 31, 2022 USD ($) borrower
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 21,864.0 | $ 22,043.0
Fair Value | $ 21,928.5 | $ 21,779.8
Loans on non-accrual status, as a percent of total investments at amortized cost | 1.20% | 1.70%
Loans on non-accrual status, as a percent of total investments at fair value | 0.60% | 1.10%
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] |  |
Amortized Cost | $ 4,991.0 | $ 5,166.0
Fair Value | $ 4,848.0 | $ 4,958.0
Number of borrowers | borrower | 21 | 22
Ivy Hill Asset Management, L.P. |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 2,314.0 | $ 2,370.0
Fair Value | $ 9,491.0 | $ 8,998.0
Number of borrowers | borrower | 23 |
Midwest | Investments, At Fair Value | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 25.40% | 23.90%
West | Investments, At Fair Value | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 24.40% | 24.50%
West | Senior Direct Lending Program | Investments, At Fair Value | Customer Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 5.50% | 5.70%
West | Ivy Hill Asset Management, L.P. | Investments, At Fair Value | Customer Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 9.20% | 10.10%
Southeast | Investments, At Fair Value | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 17.60% | 17.10%
Mid-Atlantic | Investments, At Fair Value | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 13.60% | 14.90%
Northeast | Investments, At Fair Value | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 13.00% | 14.00%
International | Investments, At Fair Value | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 6.00% | 5.60%
Software and Services |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 5,174.8 | $ 4,950.2
Fair Value | $ 5,079.5 | $ 4,760.6
Software and Services | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 23.20% | 21.90%
Financial Services |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 2,491.7 | $ 2,755.3
Fair Value | $ 2,680.3 | $ 2,890.6
Financial Services | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 12.20% | 13.30%
Health Care Services |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 2,619.9 | $ 2,525.9
Fair Value | $ 2,482.8 | $ 2,341.9
Health Care Services | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 11.30% | 10.80%
Commercial and Professional Services |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 2,182.5 | $ 2,116.3
Fair Value | $ 2,163.3 | $ 2,077.0
Commercial and Professional Services | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 9.90% | 9.50%
Investment Funds and Vehicles |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 1,280.6 | $ 1,305.8
Fair Value | $ 1,255.4 | $ 1,296.8
Investment Funds and Vehicles | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 5.70% | 6.00%
Insurance Services |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 1,091.0 | $ 1,152.6
Fair Value | $ 1,111.2 | $ 1,132.8
Insurance Services | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 5.10% | 5.20%
Power Generation |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 907.8 | $ 942.8
Fair Value | $ 967.8 | $ 988.3
Power Generation | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 4.40% | 4.50%
Consumer Services | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 3.90% | 4.20%
Consumer Durables and Apparel |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 905.4 | $ 923.9
Fair Value | $ 750.0 | $ 814.3
Consumer Durables and Apparel | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 3.40% | 3.70%
Media and Entertainment |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 551.8 | $ 422.3
Fair Value | $ 602.8 | $ 452.1
Media and Entertainment | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 2.80% | 2.10%
Capital Goods |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 458.0 | $ 758.3
Fair Value | $ 511.7 | $ 783.9
Capital Goods | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 2.30% | 3.60%
Energy |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 456.1 | $ 380.6
Fair Value | $ 509.6 | $ 425.3
Energy | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 2.30% | 2.00%
Food and Beverage |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 437.0 | $ 420.4
Fair Value | $ 453.0 | $ 431.7
Food and Beverage | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 2.10% | 2.00%
Retailing and Distribution |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 434.3 | $ 442.3
Fair Value | $ 441.9 | $ 475.2
Retailing and Distribution | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 2.00% | 2.20%
Consumer Staples Distribution and Retail |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 384.4 | $ 320.7
Fair Value | $ 426.5 | $ 346.5
Consumer Staples Distribution and Retail | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 1.90% | 1.60%
Other | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 7.50% | 7.40%
First lien senior secured loans |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 9,689.0 | $ 9,684.0
Fair Value | 9,450.0 | 9,373.0
Second lien senior secured loans |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 4,023.0 | 4,218.0
Fair Value | 3,775.0 | 3,934.0
Subordinated certificates of the SDLP |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 1,259.0 | 1,274.0
Fair Value | 1,216.0 | 1,249.0
Senior subordinated loans |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 1,057.0 | 1,163.0
Fair Value | 1,006.0 | 1,079.0
Preferred equity |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 2,345.0 | 2,095.0
Fair Value | 2,347.0 | 2,027.0
Ivy Hill Asset Management, L.P. |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 1,825.0 | 2,048.0
Fair Value | 2,020.0 | 2,201.0
Other equity |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 1,666.0 | 1,561.0
Fair Value | 2,115.0 | 1,917.0
Unitranche loans |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 5,254.0 | 4,983.0
Fair Value | $ 5,128.0 | $ 4,841.0

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