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INVESTMENTS - Schedule of Investments (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 USD ($) borrower | Dec. 31, 2022 USD ($) borrower
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 21,429.6 | $ 22,043.0
Fair Value | $ 21,148.0 | $ 21,779.8
Loans on non-accrual status, as a percent of total investments at amortized cost | 2.30% | 1.70%
Loans on non-accrual status, as a percent of total investments at fair value | 1.30% | 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 | $ 5,210.0 | $ 5,166.0
Fair Value | $ 4,932.0 | $ 4,958.0
Number of borrowers | borrower | 22 | 22
Ivy Hill Asset Management, L.P. |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 2,444.0 | $ 2,370.0
Fair Value | $ 9,549.0 | $ 8,998.0
Number of borrowers | borrower | 22 |
West | Investments, At Fair Value | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 25.30% | 24.50%
West | Senior Direct Lending Program | Investments, At Fair Value | Customer Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 5.80% | 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 | 10.90% | 10.10%
Midwest | Investments, At Fair Value | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 23.80% | 23.90%
Southeast | Investments, At Fair Value | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 17.30% | 17.10%
Northeast | Investments, At Fair Value | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 15.00% | 14.00%
Mid-Atlantic | Investments, At Fair Value | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 13.80% | 14.90%
International | Investments, At Fair Value | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 4.80% | 5.60%
Software and Services |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 4,700.8 | $ 4,950.2
Fair Value | $ 4,557.7 | $ 4,760.6
Software and Services | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 21.60% | 21.90%
Financial Services |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 2,792.5 | $ 2,755.3
Fair Value | $ 2,929.7 | $ 2,890.6
Financial Services | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 13.80% | 13.30%
Health Care Services |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 2,623.2 | $ 2,525.9
Fair Value | $ 2,382.6 | $ 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 | $ 2,132.0 | $ 2,116.3
Fair Value | $ 2,067.8 | $ 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 | $ 1,313.4 | $ 1,305.8
Fair Value | $ 1,280.4 | $ 1,296.8
Investment Funds and Vehicles | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 6.10% | 6.00%
Insurance Services |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 1,059.3 | $ 1,152.6
Fair Value | $ 1,042.1 | $ 1,132.8
Insurance Services | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 4.90% | 5.20%
Power Generation |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 957.4 | $ 942.8
Fair Value | $ 1,002.6 | $ 988.3
Power Generation | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 4.70% | 4.50%
Consumer Durables and Apparel |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 946.1 | $ 923.9
Fair Value | $ 799.3 | $ 814.3
Consumer Durables and Apparel | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 3.80% | 3.70%
Consumer Services | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 3.30% | 4.20%
Capital Goods |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 577.0 | $ 758.3
Fair Value | $ 609.3 | $ 783.9
Capital Goods | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 2.90% | 3.60%
Media and Entertainment |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 428.1 | $ 422.3
Fair Value | $ 472.1 | $ 452.1
Media and Entertainment | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 2.20% | 2.10%
Retailing and Distribution |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 440.3 | $ 442.3
Fair Value | $ 466.4 | $ 475.2
Retailing and Distribution | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 2.20% | 2.20%
Automobiles and Components |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 473.4 | $ 473.2
Fair Value | $ 459.5 | $ 452.6
Automobiles and Components | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 2.20% | 2.10%
Food and Beverage |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 431.8 | $ 420.4
Fair Value | $ 443.8 | $ 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%
Energy |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 393.7 | $ 380.6
Fair Value | $ 430.7 | $ 425.3
Energy | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 2.00% | 2.00%
Other | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 7.10% | 6.90%
First lien senior secured loans |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 9,020.0 | $ 9,684.0
Fair Value | 8,689.0 | 9,373.0
Second lien senior secured loans |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 4,230.0 | 4,218.0
Fair Value | 3,887.0 | 3,934.0
Subordinated certificates of the SDLP |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 1,282.0 | 1,274.0
Fair Value | 1,231.0 | 1,249.0
Senior subordinated loans |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 1,136.0 | 1,163.0
Fair Value | 1,048.0 | 1,079.0
Preferred equity |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 2,045.0 | 2,095.0
Fair Value | 2,069.0 | 2,027.0
Ivy Hill Asset Management, L.P. |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 2,139.0 | 2,048.0
Fair Value | 2,295.0 | 2,201.0
Other equity |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 1,578.0 | 1,561.0
Fair Value | 1,929.0 | 1,917.0
Unitranche loans |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 4,721.0 | 4,983.0
Fair Value | $ 4,575.0 | $ 4,841.0

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