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INVESTMENTS - Investments (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2025
USD ($)
borrower
Mar. 31, 2024
Dec. 31, 2024
USD ($)
borrower
Schedule of Investments [Line Items]      
Amortized Cost $ 26,777.5 [1]   $ 26,374.0 [2]
Fair Value $ 27,130.3 [1]   $ 26,719.9 [2]
Loans on non-accrual status, as a percent of total investments at amortized cost 1.50%   1.70%
Loans on non-accrual status, as a percent of total investments at fair value 0.90%   1.00%
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 20   20
Ivy Hill Asset Management, L.P.      
Schedule of Investments [Line Items]      
Amortized Cost $ 2,419.0   $ 2,237.0
Fair Value $ 9,349.0   8,172.0
Number of borrowers | borrower 22    
West | Investments, At Fair Value | Geographic Concentration Risk      
Schedule of Investments [Line Items]      
Composition, percent of fair value 23.60% 25.20%  
West | Senior Direct Lending Program | Investments, At Fair Value | Customer Concentration Risk      
Schedule of Investments [Line Items]      
Composition, percent of fair value 4.10% 4.50%  
West | Ivy Hill Asset Management, L.P. | Investments, At Fair Value | Customer Concentration Risk      
Schedule of Investments [Line Items]      
Composition, percent of fair value 7.00% 7.10%  
Midwest | Investments, At Fair Value | Geographic Concentration Risk      
Schedule of Investments [Line Items]      
Composition, percent of fair value 21.60% 20.90%  
Southeast | Investments, At Fair Value | Geographic Concentration Risk      
Schedule of Investments [Line Items]      
Composition, percent of fair value 18.50% 19.30%  
Mid-Atlantic | Investments, At Fair Value | Geographic Concentration Risk      
Schedule of Investments [Line Items]      
Composition, percent of fair value 16.50% 16.10%  
Northeast | Investments, At Fair Value | Geographic Concentration Risk      
Schedule of Investments [Line Items]      
Composition, percent of fair value 13.60% 12.20%  
International | Investments, At Fair Value | Geographic Concentration Risk      
Schedule of Investments [Line Items]      
Composition, percent of fair value 6.20% 6.30%  
Software and Services      
Schedule of Investments [Line Items]      
Amortized Cost $ 6,435.5   6,561.9
Fair Value $ 6,404.5   6,544.6
Software and Services | Investments, At Fair Value | Industry Concentration Risk      
Schedule of Investments [Line Items]      
Composition, percent of fair value 23.60% 24.50%  
Health Care Equipment and Services      
Schedule of Investments [Line Items]      
Amortized Cost $ 3,796.3   3,333.6
Fair Value $ 3,629.7   3,211.9
Health Care Equipment and Services | Investments, At Fair Value | Industry Concentration Risk      
Schedule of Investments [Line Items]      
Composition, percent of fair value 13.40% 12.00%  
Financial Services      
Schedule of Investments [Line Items]      
Amortized Cost $ 2,334.0   2,400.2
Fair Value $ 2,593.9   2,644.8
Financial Services | Investments, At Fair Value | Industry Concentration Risk      
Schedule of Investments [Line Items]      
Composition, percent of fair value 9.60% 9.90%  
Commercial and Professional Services      
Schedule of Investments [Line Items]      
Amortized Cost $ 2,582.1   2,486.8
Fair Value $ 2,568.4   2,510.0
Commercial and Professional Services | Investments, At Fair Value | Industry Concentration Risk      
Schedule of Investments [Line Items]      
Composition, percent of fair value 9.50% 9.40%  
Insurance      
Schedule of Investments [Line Items]      
Amortized Cost $ 1,588.4   1,510.1
Fair Value $ 1,669.2   1,573.5
Insurance | Investments, At Fair Value | Industry Concentration Risk      
Schedule of Investments [Line Items]      
Composition, percent of fair value 6.20% 5.90%  
Consumer Services      
Schedule of Investments [Line Items]      
Amortized Cost $ 1,290.1   1,284.0
Fair Value $ 1,415.4   1,357.6
Consumer Services | Investments, At Fair Value | Industry Concentration Risk      
Schedule of Investments [Line Items]      
Composition, percent of fair value 5.20% 5.10%  
Consumer Distribution and Retail | Investments, At Fair Value | Industry Concentration Risk      
Schedule of Investments [Line Items]      
Composition, percent of fair value 5.00% 5.70%  
Sports, Media and Entertainment      
Schedule of Investments [Line Items]      
Amortized Cost $ 1,280.8   1,214.2
Fair Value $ 1,283.0   1,218.3
Sports, Media and Entertainment | Investments, At Fair Value | Industry Concentration Risk      
Schedule of Investments [Line Items]      
Composition, percent of fair value 4.70% 4.60%  
Investment Funds and Vehicles      
Schedule of Investments [Line Items]      
Amortized Cost $ 1,245.5   1,288.2
Fair Value $ 1,138.0   1,238.4
Investment Funds and Vehicles | Investments, At Fair Value | Industry Concentration Risk      
Schedule of Investments [Line Items]      
Composition, percent of fair value 4.20% 4.60%  
Independent Power and Renewable Electricity Producers      
Schedule of Investments [Line Items]      
Amortized Cost $ 766.7    
Fair Value $ 1,069.5    
Independent Power and Renewable Electricity Producers | Investments, At Fair Value | Industry Concentration Risk      
Schedule of Investments [Line Items]      
Composition, percent of fair value 3.90% 3.70%  
Capital Goods      
Schedule of Investments [Line Items]      
Amortized Cost $ 769.6   710.9
Fair Value $ 780.4   736.5
Capital Goods | Investments, At Fair Value | Industry Concentration Risk      
Schedule of Investments [Line Items]      
Composition, percent of fair value 2.90% 2.70%  
Pharmaceuticals, Biotechnology and Life Sciences      
Schedule of Investments [Line Items]      
Amortized Cost $ 707.6   705.8
Fair Value $ 692.2   695.4
Pharmaceuticals, Biotechnology and Life Sciences | Investments, At Fair Value | Industry Concentration Risk      
Schedule of Investments [Line Items]      
Composition, percent of fair value 2.50% 2.60%  
Consumer Durables and Apparel      
Schedule of Investments [Line Items]      
Amortized Cost $ 641.3   644.7
Fair Value $ 601.9   606.4
Consumer Durables and Apparel | Investments, At Fair Value | Industry Concentration Risk      
Schedule of Investments [Line Items]      
Composition, percent of fair value 2.20% 2.30%  
Food and Beverage      
Schedule of Investments [Line Items]      
Amortized Cost $ 526.6   479.4
Fair Value $ 508.6   479.6
Food and Beverage | Investments, At Fair Value | Industry Concentration Risk      
Schedule of Investments [Line Items]      
Composition, percent of fair value 1.90% 1.80%  
Automobiles and Components      
Schedule of Investments [Line Items]      
Amortized Cost $ 357.8   392.9
Fair Value $ 350.9   383.8
Automobiles and Components | Investments, At Fair Value | Industry Concentration Risk      
Schedule of Investments [Line Items]      
Composition, percent of fair value 1.30% 1.40%  
Other | Investments, At Fair Value | Industry Concentration Risk      
Schedule of Investments [Line Items]      
Composition, percent of fair value 3.90% 3.80%  
First lien senior secured loans      
Schedule of Investments [Line Items]      
Amortized Cost $ 16,207.0   15,519.0
Fair Value 15,901.0   15,179.0
Second lien senior secured loans      
Schedule of Investments [Line Items]      
Amortized Cost 1,627.0   1,935.0
Fair Value 1,532.0   1,847.0
Subordinated certificates of the SDLP      
Schedule of Investments [Line Items]      
Amortized Cost 1,230.0   1,263.0
Fair Value 1,115.0   1,192.0
Senior subordinated loans      
Schedule of Investments [Line Items]      
Amortized Cost 1,405.0   1,384.0
Fair Value 1,366.0   1,351.0
Preferred equity      
Schedule of Investments [Line Items]      
Amortized Cost 2,680.0   2,667.0
Fair Value 2,645.0   2,649.0
Ivy Hill Asset Management, L.P.      
Schedule of Investments [Line Items]      
Amortized Cost 1,701.0   1,701.0
Fair Value 1,920.0   1,915.0
Other equity      
Schedule of Investments [Line Items]      
Amortized Cost 1,928.0   1,905.0
Fair Value 2,651.0   2,587.0
Unitranche loans      
Schedule of Investments [Line Items]      
Amortized Cost 9,983.0   8,772.0
Fair Value $ 9,828.0   $ 8,624.0
[1] As of March 31, 2025, the estimated net unrealized gain for federal tax purposes was $0.4 billion based on a tax cost basis of $26.7 billion. As of March 31, 2025, the estimated aggregate gross unrealized gain for federal income tax purposes was $1.7 billion and the estimated aggregate gross unrealized loss for federal income tax purposes was $1.3 billion.
[2] As of December 31, 2024, the estimated net unrealized gain for federal tax purposes was $0.2 billion based on a tax cost basis of $26.5 billion. As of December 31, 2024, the estimated aggregate gross unrealized gain for federal income tax purposes was $1.7 billion and the estimated aggregate gross unrealized loss for federal income tax purposes was $1.5 billion.