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INVESTMENTS - Schedule of Investments (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($) borrower | Dec. 31, 2021 USD ($) borrower
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 22,043.0 | $ 19,810.0
Fair Value | $ 21,779.8 | $ 20,009.5
Loans on non-accrual status, as a percent of total investments at amortized cost | 1.70% | 0.80%
Loans on non-accrual status, as a percent of total investments at fair value | 1.10% | 0.50%
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 | $ 5,166.0 | $ 4,193.0
Fair Value | $ 4,958.0 | $ 4,127.0
Number of borrowers | borrower | 22 | 19
Ivy Hill Asset Management, L.P. |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 2,370.0 | $ 966.0
Fair Value | $ 8,998.0 | $ 5,549.0
Number of borrowers | borrower | 21 |
West | Investments, At Fair Value | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 24.50% | 26.60%
West | Senior Direct Lending Program | Investments, At Fair Value | Customer Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 5.70% | 4.90%
West | Ivy Hill Asset Management, L.P. | Investments, At Fair Value | Customer Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 10.10% | 4.70%
Midwest | Investments, At Fair Value | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 23.90% | 27.90%
Southeast | Investments, At Fair Value | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 17.10% | 17.20%
Mid-Atlantic | Investments, At Fair Value | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 14.90% | 14.50%
Northeast | Investments, At Fair Value | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 14.00% | 9.40%
International | Investments, At Fair Value | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 5.60% | 4.40%
Software & Services |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 4,950.2 | $ 4,308.2
Fair Value | $ 4,760.6 | $ 4,378.1
Software & Services | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 21.90% | 21.90%
Diversified Financials |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 2,755.3 | $ 1,363.8
Fair Value | $ 2,890.6 | $ 1,505.3
Diversified Financials | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 13.30% | 7.50%
Health Care Services |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 2,525.9 | $ 2,133.9
Fair Value | $ 2,341.9 | $ 2,157.1
Health Care Services | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 10.80% | 10.80%
Commercial & Professional Services |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 2,116.4 | $ 1,820.0
Fair Value | $ 2,077.1 | $ 1,833.4
Commercial & Professional Services | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 9.50% | 9.20%
Investment Funds and Vehicles |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 1,305.8 | $ 1,020.0
Fair Value | $ 1,296.8 | $ 1,032.4
Investment Funds and Vehicles | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 6.00% | 5.20%
Insurance Services |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 1,152.6 | $ 1,144.0
Fair Value | $ 1,132.8 | $ 1,167.3
Insurance Services | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 5.20% | 5.80%
Power Generation |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 942.8 | $ 877.8
Fair Value | $ 988.3 | $ 898.9
Power Generation | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 4.50% | 4.50%
Consumer Services | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 4.20% | 3.90%
Consumer Durables & Apparel |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 923.9 | $ 918.7
Fair Value | $ 814.3 | $ 874.4
Consumer Durables & Apparel | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 3.70% | 4.40%
Capital Goods |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 758.3 | $ 945.3
Fair Value | $ 783.9 | $ 957.0
Capital Goods | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 3.60% | 4.80%
Automobiles & Components |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 574.8 | $ 933.1
Fair Value | $ 562.3 | $ 910.5
Automobiles & Components | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 2.60% | 4.60%
Media & Entertainment |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 422.3 | $ 434.7
Fair Value | $ 452.1 | $ 448.2
Media & Entertainment | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 2.10% | 2.20%
Food & Beverage |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 420.4 | $ 446.6
Fair Value | $ 431.7 | $ 445.3
Food & Beverage | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 2.00% | 2.20%
Energy |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 380.6 | $ 363.4
Fair Value | $ 425.3 | $ 372.2
Energy | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 2.00% | 1.90%
Pharmaceuticals, Biotechnology & Life Sciences |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 346.9 | $ 394.2
Fair Value | $ 367.5 | $ 386.8
Pharmaceuticals, Biotechnology & Life Sciences | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 1.70% | 1.90%
Other | Investments, At Fair Value | Industry Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Composition, percent of fair value | 6.90% | 9.20%
First lien senior secured loans |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 9,684.0 | $ 9,583.0
Fair Value | 9,373.0 | 9,459.0
Second lien senior secured loans |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 4,218.0 | 4,614.0
Fair Value | 3,934.0 | 4,524.0
Subordinated certificates of the SDLP |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 1,274.0 | 987.0
Fair Value | 1,249.0 | 987.0
Senior subordinated loans |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 1,163.0 | 896.0
Fair Value | 1,079.0 | 890.0
Preferred equity |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 2,095.0 | 1,547.0
Fair Value | 2,027.0 | 1,561.0
Ivy Hill Asset Management, L.P. |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 2,048.0 | 781.0
Fair Value | 2,201.0 | 936.0
Other equity |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 1,561.0 | 1,402.0
Fair Value | 1,917.0 | 1,652.0
Unitranche loans |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 4,983.0 | 5,210.0
Fair Value | $ 4,841.0 | $ 5,163.0

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