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INVESTMENTS - Investments (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 USD ($) borrower | Dec. 31, 2023 USD ($) borrower
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 26,374.0 | [1] | $ 22,667.6 | [2]
Fair Value | $ 26,719.9 | [1] | $ 22,873.7 | [2]
Loans on non-accrual status, as a percent of total investments at amortized cost | 1.70% |  | 1.30% |
Loans on non-accrual status, as a percent of total investments at fair value | 1.00% |  | 0.60% |
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 | $ 4,591.0 |  | $ 5,267.0 |
Fair Value | $ 4,390.0 |  | $ 5,129.0 |
Number of borrowers | borrower | 20 |  | 22 |
Ivy Hill Asset Management, L.P. |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 2,237.0 |  | $ 2,288.0 |
Fair Value | $ 8,173.0 |  | $ 9,401.0 |
Number of borrowers | borrower | 20 |  |  |
West | Investments, At Fair Value | Geographic Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Composition, percent of fair value | 25.20% |  | 24.30% |
West | Senior Direct Lending Program | Investments, At Fair Value | Customer Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Composition, percent of fair value | 4.50% |  | 5.60% |
West | Ivy Hill Asset Management, L.P. | Investments, At Fair Value | Customer Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Composition, percent of fair value | 7.10% |  | 8.70% |
Midwest | Investments, At Fair Value | Geographic Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Composition, percent of fair value | 20.90% |  | 24.70% |
Southeast | Investments, At Fair Value | Geographic Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Composition, percent of fair value | 19.30% |  | 18.50% |
Mid-Atlantic | Investments, At Fair Value | Geographic Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Composition, percent of fair value | 16.10% |  | 13.30% |
Northeast | Investments, At Fair Value | Geographic Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Composition, percent of fair value | 12.20% |  | 13.20% |
International | Investments, At Fair Value | Geographic Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Composition, percent of fair value | 6.30% |  | 6.00% |
Software and Services |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 6,561.9 |  | $ 5,362.2 |
Fair Value | $ 6,544.6 |  | $ 5,293.6 |
Software and Services | Investments, At Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Composition, percent of fair value | 24.50% |  | 23.20% |
Health Care Equipment and Services |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 3,333.6 |  | $ 2,914.8 |
Fair Value | $ 3,211.9 |  | $ 2,768.9 |
Health Care Equipment and Services | Investments, At Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Composition, percent of fair value | 12.00% |  | 12.10% |
Financial Services |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 2,400.2 |  | $ 2,391.6 |
Fair Value | $ 2,644.8 |  | $ 2,617.8 |
Financial Services | Investments, At Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Composition, percent of fair value | 9.90% |  | 11.40% |
Commercial and Professional Services |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 2,486.8 |  | $ 2,317.0 |
Fair Value | $ 2,510.0 |  | $ 2,329.5 |
Commercial and Professional Services | Investments, At Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Composition, percent of fair value | 9.40% |  | 10.20% |
Insurance |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 1,510.1 |  | $ 1,113.4 |
Fair Value | $ 1,573.5 |  | $ 1,176.0 |
Insurance | Investments, At Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Composition, percent of fair value | 5.90% |  | 5.10% |
Consumer Distribution and Retail | Investments, At Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Composition, percent of fair value | 5.70% |  | 4.60% |
Consumer Services | Investments, At Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Composition, percent of fair value | 5.10% |  | 4.10% |
Investment Funds And Vehicles |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 1,288.2 |  | $ 1,338.3 |
Fair Value | $ 1,238.4 |  | $ 1,329.2 |
Investment Funds And Vehicles | Investments, At Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Composition, percent of fair value | 4.60% |  | 5.80% |
Media and Entertainment |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 1,214.2 |  | $ 584.7 |
Fair Value | $ 1,218.3 |  | $ 649.7 |
Media and Entertainment | Investments, At Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Composition, percent of fair value | 4.60% |  | 2.80% |
Independent Power and Renewable Electricity Producers |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost |  |  | $ 804.0 |
Fair Value |  |  | $ 880.9 |
Independent Power and Renewable Electricity Producers | Investments, At Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Composition, percent of fair value | 3.70% |  | 3.80% |
Capital Goods |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 710.9 |  | $ 496.6 |
Fair Value | $ 736.5 |  | $ 549.4 |
Capital Goods | Investments, At Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Composition, percent of fair value | 2.70% |  | 2.40% |
Pharmaceuticals, Biotechnology and Life Sciences |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 705.8 |  | $ 334.1 |
Fair Value | $ 695.4 |  | $ 353.8 |
Pharmaceuticals, Biotechnology and Life Sciences | Investments, At Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Composition, percent of fair value | 2.60% |  | 1.50% |
Consumer Durables and Apparel |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 644.7 |  | $ 877.9 |
Fair Value | $ 606.4 |  | $ 718.6 |
Consumer Durables and Apparel | Investments, At Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Composition, percent of fair value | 2.30% |  | 3.10% |
Food and Beverage |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 479.4 |  |  |
Fair Value | $ 479.6 |  |  |
Food and Beverage | Investments, At Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Composition, percent of fair value | 1.80% |  | 2.10% |
Automobiles and Components |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 392.9 |  | $ 393.9 |
Fair Value | $ 383.8 |  | $ 381.5 |
Automobiles and Components | Investments, At Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Composition, percent of fair value | 1.40% |  | 1.70% |
Other | Investments, At Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Composition, percent of fair value | 3.80% |  | 6.10% |
First lien senior secured loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 15,519.0 |  | $ 10,313.0 |
Fair Value | 15,179.0 |  | 10,081.0 |
Second lien senior secured loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | 1,935.0 |  | 3,980.0 |
Fair Value | 1,847.0 |  | 3,753.0 |
Subordinated certificates of the SDLP |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | 1,263.0 |  | 1,316.0 |
Fair Value | 1,192.0 |  | 1,288.0 |
Senior subordinated loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | 1,384.0 |  | 1,150.0 |
Fair Value | 1,351.0 |  | 1,096.0 |
Preferred equity |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | 2,667.0 |  | 2,457.0 |
Fair Value | 2,649.0 |  | 2,460.0 |
Ivy Hill Asset Management, L.P. |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | 1,701.0 |  | 1,763.0 |
Fair Value | 1,915.0 |  | 1,987.0 |
Other equity |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | 1,905.0 |  | 1,689.0 |
Fair Value | 2,587.0 |  | 2,209.0 |
Unitranche loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | 8,772.0 |  | 5,786.0 |
Fair Value | $ 8,624.0 |  | $ 5,667.0 |
[1] | 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.
[2] | 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.

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