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INVESTMENTS - Schedule of Investments (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
borrower
Dec. 31, 2022
USD ($)
borrower
Schedule of Investments [Line Items]    
Amortized Cost $ 22,667.6 [1] $ 22,043.0 [2]
Fair Value $ 22,873.7 [1] $ 21,779.8 [2]
Loans on non-accrual status, as a percent of total investments at amortized cost 1.30% 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 $ 5,267.0 $ 5,166.0
Fair Value $ 5,129.0 $ 4,958.0
Number of borrowers | borrower 22 22
Ivy Hill Asset Management, L.P.    
Schedule of Investments [Line Items]    
Amortized Cost $ 2,288.0 $ 2,370.0
Fair Value $ 9,401.0 $ 8,998.0
Number of borrowers | borrower 20  
Midwest | Investments, At Fair Value | Geographic Concentration Risk    
Schedule of Investments [Line Items]    
Composition, percent of fair value 24.70% 23.90%
West | Investments, At Fair Value | Geographic Concentration Risk    
Schedule of Investments [Line Items]    
Composition, percent of fair value 24.30% 24.50%
West | Senior Direct Lending Program | Investments, At Fair Value | Customer Concentration Risk    
Schedule of Investments [Line Items]    
Composition, percent of fair value 5.60% 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 8.70% 10.10%
Southeast | Investments, At Fair Value | Geographic Concentration Risk    
Schedule of Investments [Line Items]    
Composition, percent of fair value 18.50% 17.10%
Mid-Atlantic | Investments, At Fair Value | Geographic Concentration Risk    
Schedule of Investments [Line Items]    
Composition, percent of fair value 13.30% 14.90%
Northeast | Investments, At Fair Value | Geographic Concentration Risk    
Schedule of Investments [Line Items]    
Composition, percent of fair value 13.20% 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 $ 5,362.2 $ 4,950.2
Fair Value $ 5,293.6 $ 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%
Health Care Services    
Schedule of Investments [Line Items]    
Amortized Cost $ 2,914.8 $ 2,525.9
Fair Value $ 2,768.9 $ 2,341.9
Health Care Services | Investments, At Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Composition, percent of fair value 12.10% 10.80%
Financial Services    
Schedule of Investments [Line Items]    
Amortized Cost $ 2,391.6 $ 2,755.3
Fair Value $ 2,617.8 $ 2,890.6
Financial Services | Investments, At Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Composition, percent of fair value 11.50% 13.30%
Commercial and Professional Services    
Schedule of Investments [Line Items]    
Amortized Cost $ 2,239.1 $ 2,116.3
Fair Value $ 2,251.7 $ 2,077.0
Commercial and Professional Services | Investments, At Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Composition, percent of fair value 9.80% 9.50%
Investment Funds and Vehicles    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,338.3 $ 1,305.8
Fair Value $ 1,329.2 $ 1,296.8
Investment Funds and Vehicles | Investments, At Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Composition, percent of fair value 5.80% 6.00%
Insurance Services    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,113.4 $ 1,152.6
Fair Value $ 1,176.0 $ 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%
Consumer Services | Investments, At Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Composition, percent of fair value 4.30% 4.20%
Power Generation    
Schedule of Investments [Line Items]    
Amortized Cost $ 899.4 $ 942.8
Fair Value $ 970.4 $ 988.3
Power Generation | Investments, At Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Composition, percent of fair value 4.20% 4.50%
Consumer Durables and Apparel    
Schedule of Investments [Line Items]    
Amortized Cost $ 877.9 $ 923.9
Fair Value $ 718.6 $ 814.3
Consumer Durables and Apparel | Investments, At Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Composition, percent of fair value 3.10% 3.70%
Media and Entertainment    
Schedule of Investments [Line Items]    
Amortized Cost $ 584.7 $ 422.3
Fair Value $ 649.7 $ 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%
Retailing and Distribution    
Schedule of Investments [Line Items]    
Amortized Cost $ 583.9 $ 442.3
Fair Value $ 580.7 $ 475.2
Retailing and Distribution | Investments, At Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Composition, percent of fair value 2.50% 2.20%
Capital Goods    
Schedule of Investments [Line Items]    
Amortized Cost $ 497.6 $ 758.3
Fair Value $ 550.4 $ 783.9
Capital Goods | Investments, At Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Composition, percent of fair value 2.40% 3.60%
Energy    
Schedule of Investments [Line Items]    
Amortized Cost $ 445.3 $ 380.6
Fair Value $ 492.3 $ 425.3
Energy | Investments, At Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Composition, percent of fair value 2.20% 2.00%
Food and Beverage    
Schedule of Investments [Line Items]    
Amortized Cost $ 460.7 $ 420.4
Fair Value $ 476.8 $ 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%
Consumer Staples Distribution and Retail    
Schedule of Investments [Line Items]    
Amortized Cost $ 380.3 $ 320.7
Fair Value $ 417.2 $ 346.5
Consumer Staples Distribution and Retail | Investments, At Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Composition, percent of fair value 1.80% 1.60%
Other | Investments, At Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Composition, percent of fair value 7.10% 7.40%
First lien senior secured loans    
Schedule of Investments [Line Items]    
Amortized Cost $ 10,313.0 $ 9,684.0
Fair Value 10,081.0 9,373.0
Second lien senior secured loans    
Schedule of Investments [Line Items]    
Amortized Cost 3,980.0 4,218.0
Fair Value 3,753.0 3,934.0
Subordinated certificates of the SDLP    
Schedule of Investments [Line Items]    
Amortized Cost 1,316.0 1,274.0
Fair Value 1,288.0 1,249.0
Senior subordinated loans    
Schedule of Investments [Line Items]    
Amortized Cost 1,150.0 1,163.0
Fair Value 1,096.0 1,079.0
Preferred equity    
Schedule of Investments [Line Items]    
Amortized Cost 2,457.0 2,095.0
Fair Value 2,460.0 2,027.0
Ivy Hill Asset Management, L.P.    
Schedule of Investments [Line Items]    
Amortized Cost 1,763.0 2,048.0
Fair Value 1,987.0 2,201.0
Other equity    
Schedule of Investments [Line Items]    
Amortized Cost 1,689.0 1,561.0
Fair Value 2,209.0 1,917.0
Unitranche loans    
Schedule of Investments [Line Items]    
Amortized Cost 5,786.0 4,983.0
Fair Value $ 5,667.0 $ 4,841.0
[1] As of December 31, 2023, the estimated net unrealized loss for federal tax purposes was $0.4 billion based on a tax cost basis of $22.5 billion. As of December 31, 2023, the estimated aggregate gross unrealized loss for federal income tax purposes was $1.7 billion and the estimated aggregate gross unrealized gain for federal income tax purposes was $1.3 billion.     
[2] As of December 31, 2022, the estimated net unrealized loss for federal tax purposes was $0.2 billion based on a tax cost basis of $22.0 billion. As of December 31, 2022, the estimated aggregate gross unrealized loss for federal income tax purposes was $1.2 billion and the estimated aggregate gross unrealized gain for federal income tax purposes was $1.0 billion.