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INVESTMENTS - Schedule of Investments (Details) $ in Millions | 12 Months Ended
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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.

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