Consolidated Schedule of Investments (Parenthetical) € in Millions, £ in Millions, kr in Millions, kr in Millions, $ in Millions, $ in Millions, $ in Millions		3 Months Ended				12 Months Ended
		Mar. 31, 2023 USD ($)		Mar. 31, 2023 EUR (€)	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)		Mar. 31, 2023 AUD ($)	Mar. 31, 2023 CAD ($)	Mar. 31, 2023 EUR (€)	Mar. 31, 2023 GBP (£)	Mar. 31, 2023 NOK (kr)	Mar. 31, 2023 SEK (kr)	Dec. 31, 2022 AUD ($)	Dec. 31, 2022 CAD ($)	Dec. 31, 2022 EUR (€)	Dec. 31, 2022 GBP (£)	Dec. 31, 2022 NOK (kr)	Dec. 31, 2022 SEK (kr)
Derivative [Line Items]
Value at Settlement		$ 199.7				$ 236.9
Current Value		180.0				213.3
Derivative Assets Subject to Master Netting Agreement		21.0				25.0
Derivatives Available for Offset		(1.0)				(1.0)
Derivative asset		$ 19.7				$ 23.6
Qualifying assets, percent of total assets		76.10%				75.30%		76.10%	76.10%	76.10%	76.10%	76.10%	76.10%	75.30%	75.30%	75.30%	75.30%	75.30%	75.30%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1]	$ 15,377.3
Net Realized Gain (Loss)		(58.0)			$ (32.0)
Net Change in Unrealized Appreciation (Depreciation)		31.0			27.0
Fair Value, ending balance		15,277.1				$ 15,377.3	[1]
PIK Income		$ 28.0			34.0
LIBOR
Derivative [Line Items]
Variable rate		5.19%				4.77%		5.19%	5.19%	5.19%	5.19%	5.19%	5.19%	4.77%	4.77%	4.77%	4.77%	4.77%	4.77%
EURIBOR
Derivative [Line Items]
Variable rate		3.04%						3.04%	3.04%	3.04%	3.04%	3.04%	3.04%
CDOR
Derivative [Line Items]
Variable rate		5.03%				4.94%		5.03%	5.03%	5.03%	5.03%	5.03%	5.03%	4.94%	4.94%	4.94%	4.94%	4.94%	4.94%
BBSY
Derivative [Line Items]
Variable rate		3.77%						3.77%	3.77%	3.77%	3.77%	3.77%	3.77%
REIBOR
Derivative [Line Items]
Variable rate		8.25%				6.55%		8.25%	8.25%	8.25%	8.25%	8.25%	8.25%	6.55%	6.55%	6.55%	6.55%	6.55%	6.55%
STIBOR
Derivative [Line Items]
Variable rate		3.36%				2.70%		3.36%	3.36%	3.36%	3.36%	3.36%	3.36%	2.70%	2.70%	2.70%	2.70%	2.70%	2.70%
Sterling Interbank Offered Rate, SONIA
Derivative [Line Items]
Variable rate		4.18%				3.43%		4.18%	4.18%	4.18%	4.18%	4.18%	4.18%	3.43%	3.43%	3.43%	3.43%	3.43%	3.43%
Secured Overnight Financing Rate (SOFR)
Derivative [Line Items]
Variable rate		4.91%				4.59%		4.91%	4.91%	4.91%	4.91%	4.91%	4.91%	4.59%	4.59%	4.59%	4.59%	4.59%	4.59%
Pime
Derivative [Line Items]
Variable rate		8.00%				7.50%		8.00%	8.00%	8.00%	8.00%	8.00%	8.00%	7.50%	7.50%	7.50%	7.50%	7.50%	7.50%
Euro Interbank Offer Rate (EURIBOR)
Derivative [Line Items]
Variable rate						2.13%								2.13%	2.13%	2.13%	2.13%	2.13%	2.13%
Bank Bill Swap Bid Rate
Derivative [Line Items]
Variable rate						3.32%								3.32%	3.32%	3.32%	3.32%	3.32%	3.32%
Non-controlled/affiliated investments
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		$ 443.4			859.0	$ 859.0
Gross Additions		4.2	[2]			373.5	[3]
Gross Reductions		(24.1)	[4]			(741.3)	[5]
Net Realized Gain (Loss)		0.2			(6.0)	83.6
Net Change in Unrealized Appreciation (Depreciation)		15.5			30.0	(131.4)
Fair Value, ending balance		439.2				443.4
Investment Income		3.2	[6]			28.2	[7]
PIK Income		9.1	[6]		11.0	48.2	[7]
Fee income		0.0	[6]		2.0	5.6	[7]
Dividend and Other Income		0.0	[6]		5.0	6.5	[7]
Controlled/affiliated investments
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		2,908.4			2,684.1	2,684.1
Gross Additions		63.5	[2]			801.5	[3]
Gross Reductions		(5.1)	[4]			(334.7)	[5]
Net Realized Gain (Loss)		0.0			0.0	(71.4)
Net Change in Unrealized Appreciation (Depreciation)		10.2			37.0	(171.1)
Fair Value, ending balance		2,977.0				2,908.4
Investment Income		19.1	[6]			58.2	[7]
PIK Income		10.0	[6]		14.0	43.1	[7]
Fee income		0.0	[6]		0.0	0.0	[7]
Dividend and Other Income		62.9	[6]		50.0	228.7	[7]
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,AUD February 2023
Derivative [Line Items]
Value at Settlement						1.6								$ 2.2
Current Value						1.5
Derivative Assets Subject to Master Netting Agreement						0.1
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,AUD October, 2024 2
Derivative [Line Items]
Value at Settlement		1.5						$ 2.2
Current Value		1.5
Derivative Assets Subject to Master Netting Agreement		0.0
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,AUD October, 2024 1
Derivative [Line Items]
Value at Settlement		5.2						$ 8.3
Current Value		5.6
Derivatives Available for Offset		(0.4)
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,AUD, October 2024
Derivative [Line Items]
Value at Settlement						5.2								$ 8.3
Current Value						5.7
Derivatives Available for Offset						(0.5)
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,CAD, January 2023 ,1
Derivative [Line Items]
Value at Settlement						1.2									$ 1.5
Current Value						1.1
Derivative Assets Subject to Master Netting Agreement						0.1
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,CAD, January 2023 ,2
Derivative [Line Items]
Value at Settlement						1.1									1.5
Current Value						1.1
Derivative Assets Subject to Master Netting Agreement						0.0
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,CAD, July 2023 1
Derivative [Line Items]
Value at Settlement		1.5				1.5			$ 1.9						1.9
Current Value		1.4				1.4
Derivative Assets Subject to Master Netting Agreement		0.1				0.1
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,CAD, July 2023 2
Derivative [Line Items]
Value at Settlement		1.1				1.1			1.4						1.4
Current Value		1.0				1.0
Derivative Assets Subject to Master Netting Agreement		0.1				0.1
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,CAD, November 2024 1
Derivative [Line Items]
Value at Settlement						3.2									4.0
Current Value						2.9
Derivative Assets Subject to Master Netting Agreement						0.3
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,CAD, November 2024 2
Derivative [Line Items]
Value at Settlement						1.1									1.5
Current Value						1.1
Derivative Assets Subject to Master Netting Agreement						0.0
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,CAD, November, 2024 1
Derivative [Line Items]
Value at Settlement		3.2							4.0
Current Value		2.9
Derivative Assets Subject to Master Netting Agreement		0.3
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,CAD, November, 2024 2
Derivative [Line Items]
Value at Settlement		1.1							1.5
Current Value		1.1
Derivative Assets Subject to Master Netting Agreement		0.0
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,CAD, September 2024
Derivative [Line Items]
Value at Settlement						1.6									$ 2.1
Current Value						1.6
Derivative Assets Subject to Master Netting Agreement						0.0
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,CAD, September, 2024
Derivative [Line Items]
Value at Settlement		1.6							$ 2.1
Current Value		1.6
Derivative Assets Subject to Master Netting Agreement		0.0
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,EUR, August 2025
Derivative [Line Items]
Value at Settlement						5.7
Current Value						5.3
Derivative Assets Subject to Master Netting Agreement						0.4
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,EUR, August 2025 1
Derivative [Line Items]
Value at Settlement		5.7								€ 4.8						€ 4.8
Current Value		5.3
Derivative Assets Subject to Master Netting Agreement		0.4
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,EUR, August 2025 2
Derivative [Line Items]
Value at Settlement		2.3				2.3				1.9						1.9
Current Value		2.2				2.1
Derivative Assets Subject to Master Netting Agreement		0.1				0.2
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,EUR, December 2023
Derivative [Line Items]
Value at Settlement						13.4										13.0
Current Value						14.2
Derivatives Available for Offset						(0.8)
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,EUR, February, 2024
Derivative [Line Items]
Value at Settlement		32.0				49.1				€ 27.6						42.3
Current Value		30.3				46.1
Derivative Assets Subject to Master Netting Agreement		1.7				3.0
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,EUR, July 2023
Derivative [Line Items]
Value at Settlement						1.7										€ 1.3
Current Value						1.4
Derivative Assets Subject to Master Netting Agreement						0.3
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,GBP, January 2023,1
Derivative [Line Items]
Value at Settlement						2.9											£ 1.9
Current Value						2.3
Derivative Assets Subject to Master Netting Agreement						0.6
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,GBP, January 2023,2
Derivative [Line Items]
Value at Settlement						2.6											1.7
Current Value						2.1
Derivative Assets Subject to Master Netting Agreement						0.5
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,GBP, January 2023,3
Derivative [Line Items]
Value at Settlement						4.8											3.4
Current Value						4.1
Derivative Assets Subject to Master Netting Agreement						0.7
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,GBP, January 2023,4
Derivative [Line Items]
Value at Settlement						6.6											5.0
Current Value						6.0
Derivative Assets Subject to Master Netting Agreement						0.6
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,GBP, January 2023,5
Derivative [Line Items]
Value at Settlement						1.9											1.4
Current Value						1.7
Derivative Assets Subject to Master Netting Agreement						0.2
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,GBP, November 2024, 5
Derivative [Line Items]
Value at Settlement		2.3									£ 1.9
Current Value		2.4
Derivatives Available for Offset		(0.1)
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,GBP, November, 2024 1
Derivative [Line Items]
Value at Settlement		1.7									1.4
Current Value		1.7
Derivative Assets Subject to Master Netting Agreement		0.0
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,GBP, November, 2024 2
Derivative [Line Items]
Value at Settlement		4.1									3.4
Current Value		4.2
Derivatives Available for Offset		(0.1)
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,GBP, November, 2024 3
Derivative [Line Items]
Value at Settlement		2.1									1.7
Current Value		2.1
Derivative Assets Subject to Master Netting Agreement		0.0
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,GBP, November, 2024 4
Derivative [Line Items]
Value at Settlement		6.0									5.0
Current Value		6.2
Derivatives Available for Offset		0.2
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,GBP, October 2023
Derivative [Line Items]
Value at Settlement						8.5											£ 6.2
Current Value						7.5
Derivative Assets Subject to Master Netting Agreement						1.0
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,GBP, October, 2023
Derivative [Line Items]
Value at Settlement		8.5									£ 6.2
Current Value		7.7
Derivative Assets Subject to Master Netting Agreement		0.8
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,NOK, August, 2025
Derivative [Line Items]
Value at Settlement		4.8										kr 45.0
Current Value		4.4
Derivative Assets Subject to Master Netting Agreement		0.4
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,NOK, May 2024 1
Derivative [Line Items]
Value at Settlement		26.3										kr 250.0
Current Value		24.5
Derivative Assets Subject to Master Netting Agreement		1.8
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,SEK, August 2025, 1
Derivative [Line Items]
Value at Settlement						13.3													kr 119.3
Current Value						11.8
Derivative Assets Subject to Master Netting Agreement						1.5
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,SEK, August 2025, 2
Derivative [Line Items]
Value at Settlement						3.1													27.8
Current Value						2.7
Derivative Assets Subject to Master Netting Agreement						0.4
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,SEK, May 2024 1
Derivative [Line Items]
Value at Settlement		60.1											kr 503.0
Current Value		49.3
Derivative Assets Subject to Master Netting Agreement		10.8
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,SEK, May 2024 2
Derivative [Line Items]
Value at Settlement		4.1											34.5
Current Value		3.4
Derivative Assets Subject to Master Netting Agreement		0.7
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,SEK, May 2024 3
Derivative [Line Items]
Value at Settlement		8.1											68.0
Current Value		6.7
Derivative Assets Subject to Master Netting Agreement		1.4
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,SEK, May 2024, 1
Derivative [Line Items]
Value at Settlement						60.1													503.0
Current Value						49.3
Derivative Assets Subject to Master Netting Agreement						10.8
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,SEK, May 2024, 2
Derivative [Line Items]
Value at Settlement						4.1													34.5
Current Value						3.4
Derivative Assets Subject to Master Netting Agreement						0.7
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,SEK, May 2024, 3
Derivative [Line Items]
Value at Settlement						8.1													68.0
Current Value						6.7
Derivative Assets Subject to Master Netting Agreement						1.4
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,SEK, May 2024, 4
Derivative [Line Items]
Value at Settlement						26.3													kr 250.0
Current Value						24.5
Derivative Assets Subject to Master Netting Agreement						1.8
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,SEK, May 2025,1
Derivative [Line Items]
Value at Settlement		13.3											119.3
Current Value		11.8
Derivative Assets Subject to Master Netting Agreement		1.5
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank ,SEK, May 2025,2
Derivative [Line Items]
Value at Settlement		3.1											kr 27.8
Current Value		2.7
Derivative Assets Subject to Master Netting Agreement		0.4
Open Forward Foreign Currency Contract, Identifier [Axis]: JP Morgan Chase Bank NOK, August 2025
Derivative [Line Items]
Value at Settlement						4.8												kr 45.0
Current Value						4.7
Derivative Assets Subject to Master Netting Agreement						0.1
Investment, Identifier [Axis]: Affordable Care Inc, Common Stock, Equity/Other
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		49.9			52.1	52.1
Gross Additions	[3]					0.0
Gross Reductions	[5]					0.0
Net Realized Gain (Loss)						0.0
Net Change in Unrealized Appreciation (Depreciation)						(2.2)
Fair Value, ending balance						49.9
Investment Income	[7]					0.0
PIK Income	[7]					5.5
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Belk Inc, Senior Secured Loans—Second Lien
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		3.3			6.7	6.7
Gross Additions	[3]					0.0
Gross Reductions	[5]					0.0
Net Realized Gain (Loss)						0.0
Net Change in Unrealized Appreciation (Depreciation)						(3.4)
Fair Value, ending balance						3.3
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Fairway Group Holdings Corp , Senior Secured Loans—Second Lien
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.0	0.0
Gross Additions	[3]					0.0
Gross Reductions	[5]					0.0
Net Realized Gain (Loss)						0.0
Net Change in Unrealized Appreciation (Depreciation)						0.0
Fair Value, ending balance						0.0
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Fronton BV, Common Stock, Equity/Other
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		1.0			1.4	1.4
Gross Additions	[3]					0.0
Gross Reductions	[5]					0.0
Net Realized Gain (Loss)						0.0
Net Change in Unrealized Appreciation (Depreciation)						(0.4)
Fair Value, ending balance						1.0
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Home Partners JV 2, Private Equity 1, Asset Based Finance
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.2			0.1	0.1
Gross Additions	[3]					0.1
Gross Reductions	[5]					0.0
Net Realized Gain (Loss)						0.0
Net Change in Unrealized Appreciation (Depreciation)						0.0
Fair Value, ending balance						0.2
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Home Partners JV 2, Private Equity 2, Asset Based Finance -1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		5.0			1.6	1.6
Gross Additions	[3]					2.9
Gross Reductions	[5]					0.0
Net Realized Gain (Loss)						0.0
Net Change in Unrealized Appreciation (Depreciation)						0.5
Fair Value, ending balance						5.0
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Home Partners JV, Private Equity, Asset Based Finance -1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			9.4	9.4
Gross Additions	[3]					0.0
Gross Reductions	[5]					(11.8)
Net Realized Gain (Loss)						6.4
Net Change in Unrealized Appreciation (Depreciation)						(4.0)
Fair Value, ending balance						0.0
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.7
Investment, Identifier [Axis]: Home Partners JV, Structured Mezzanine, Asset Based Finance
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			90.4	90.4
Gross Additions	[3]					7.9
Gross Reductions	[5]					(98.1)
Net Realized Gain (Loss)						4.6
Net Change in Unrealized Appreciation (Depreciation)						(4.8)
Fair Value, ending balance						0.0
Investment Income	[7]					0.3
PIK Income	[7]					7.5
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Jet Edge International LLC, Preferred Stock, Asset Based Finance -2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			16.8	16.8
Gross Additions	[3]					0.0
Gross Reductions	[5]					(30.1)
Net Realized Gain (Loss)						9.2
Net Change in Unrealized Appreciation (Depreciation)						4.1
Fair Value, ending balance						0.0
Investment Income	[7]					0.7
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Micronics Filtration Holdings Inc, Preferred Stock, Series A, Equity/Other
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.1	0.1
Gross Additions	[3]					0.0
Gross Reductions	[5]					0.0
Net Realized Gain (Loss)						(0.6)
Net Change in Unrealized Appreciation (Depreciation)						0.5
Fair Value, ending balance						0.0
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Micronics Filtration Holdings Inc, Preferred Stock, Series B PIK 2, Equity/Other
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			11.9	11.9
Gross Additions	[2]					0.0
Gross Reductions	[4]					(11.9)
Net Realized Gain (Loss)						11.9
Net Change in Unrealized Appreciation (Depreciation)						(11.9)
Fair Value, ending balance						0.0
Investment Income						0.0
PIK Income						0.0
Fee income						0.0
Dividend and Other Income						0.0
Investment, Identifier [Axis]: Micronics Filtration Holdings Inc, Preferred Stock, Series B PIK, Equity/Other
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.4	0.4
Gross Additions	[3]					0.0
Gross Reductions	[5]					(0.4)
Net Realized Gain (Loss)						0.2
Net Change in Unrealized Appreciation (Depreciation)						(0.2)
Fair Value, ending balance						0.0
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Micronics Filtration Holdings Inc, Preferred Stock, Series C PIK, Equity/Other
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			6.2	6.2
Gross Additions	[2]					0.0
Gross Reductions	[4]					(6.2)
Net Realized Gain (Loss)						6.2
Net Change in Unrealized Appreciation (Depreciation)						(6.2)
Fair Value, ending balance						0.0
Investment Income	[6]					0.0
PIK Income	[6]					0.0
Fee income	[6]					0.0
Dividend and Other Income	[6]					0.0
Investment, Identifier [Axis]: Petroplex Acidizing Inc, Warrant, Equity/Other
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.0	0.0
Gross Additions	[2]					0.0
Gross Reductions	[4]					0.0
Net Realized Gain (Loss)						0.0
Net Change in Unrealized Appreciation (Depreciation)						0.0
Fair Value, ending balance						0.0
Investment Income	[6]					0.0
PIK Income	[6]					0.0
Fee income	[6]					0.0
Dividend and Other Income	[6]					0.0
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc, Senior Secured Loans—Second Lien
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[8]	0.0			8.3	8.3
Gross Additions	[3],[8]					0.0
Gross Reductions	[5],[8]					(0.2)
Net Realized Gain (Loss)	[8]					0.0
Net Change in Unrealized Appreciation (Depreciation)	[8]					(8.1)
Fair Value, ending balance	[8]					0.0
Investment Income	[7],[8]					0.0
PIK Income	[7],[8]					0.0
Fee income	[7],[8]					0.0
Dividend and Other Income	[7],[8]					0.0
Investment, Identifier [Axis]: 3Pillar Global Inc, Software & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[9],[10],[11],[12]	96.7
Fair Value, ending balance		0.6	[13],[14]			96.7	[1],[9],[10],[11],[12]
Investment, Identifier [Axis]: 3Pillar Global Inc, Software & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	8.8
Fair Value, ending balance		92.3	[14],[16],[17],[18]			8.8	[1],[15]
Investment, Identifier [Axis]: 3Pillar Global Inc, Software & Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	23.8
Fair Value, ending balance		6.4	[13],[14]			23.8	[1],[15]
Investment, Identifier [Axis]: 3Pillar Global Inc, Software & Services 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19]	8.3
Investment, Identifier [Axis]: 3Pillar Global Inc, Software & Services 5
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19]	23.3
Investment, Identifier [Axis]: 48Forty Solutions LLC, Commercial & Professional Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[9],[10],[11],[20],[21]	177.8
Fair Value, ending balance		180.6	[13],[14],[17],[18],[22],[23]			177.8	[1],[9],[10],[11],[20],[21]
Investment, Identifier [Axis]: 48Forty Solutions LLC, Commercial & Professional Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	10.3
Fair Value, ending balance		1.1	[13],[14]			10.3	[1],[15]
Investment, Identifier [Axis]: 48Forty Solutions LLC, Commercial & Professional Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19]	9.5
Investment, Identifier [Axis]: 5 Arch Income Fund 2 LLC, Diversified Financials
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[24],[25],[26],[27],[28]	52.5
Fair Value, ending balance	[1],[24],[25],[26],[27],[28]					52.5
Investment, Identifier [Axis]: 5 Arch Income Fund 2 LLC, Financial Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[29],[30],[31],[32],[33]	37.5
Investment, Identifier [Axis]: 801 5th Ave, Seattle, Private Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		6.3			23.1	23.1
Gross Additions		0.0	[2]			0.0	[3]
Gross Reductions		0.0	[4]			(0.1)	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		(1.1)				(16.7)
Fair Value, ending balance		5.2				6.3
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: 801 5th Ave, Seattle, Private Equity, Equity Real Estate Investment Trusts (REITs)
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[32],[33],[34]	5.2
Investment, Identifier [Axis]: 801 5th Ave, Seattle, Private Equity, Real Estate
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[28],[35]	6.3
Fair Value, ending balance	[1],[11],[27],[28],[35]					6.3
Investment, Identifier [Axis]: 801 5th Ave, Seattle, Structure Mezzanine
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		58.9			57.2	57.2
Gross Additions		0.1	[2]			1.9	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		(0.1)				(0.2)
Fair Value, ending balance		58.9				58.9
Investment Income		1.2	[6]			4.7	[7]
PIK Income		0.4	[6]			1.7	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: 801 5th Ave, Seattle, Structure Mezzanine, Equity Real Estate Investment Trusts (REITs)
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[33],[34]	58.9
Investment, Identifier [Axis]: 801 5th Ave, Seattle, Structure Mezzanine, Real Estate
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28],[35]	58.9
Fair Value, ending balance	[1],[11],[28],[35]					58.9
Investment, Identifier [Axis]: ATX Networks Corp 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		40.6			46.8	46.8
Gross Additions		15.8	[2]			0.4	[3]
Gross Reductions		(0.8)	[4]			(6.6)	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0				0.0
Fair Value, ending balance		55.6				40.6
Investment Income		1.4	[6]			3.2	[7]
PIK Income		0.0	[6]			1.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: ATX Networks Corp 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		21.9			7.1	7.1
Gross Additions		9.3	[2]			3.6	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		0.1				11.2
Fair Value, ending balance		31.3				21.9
Investment Income		0.3	[6]			1.6	[7]
PIK Income		0.6	[6]			1.5	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: ATX Networks Corp, Capital Goods 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28],[35],[36]	40.6
Fair Value, ending balance		55.6	[13],[14],[33],[34],[37]			40.6	[1],[11],[28],[35],[36]
Investment, Identifier [Axis]: ATX Networks Corp, Capital Goods 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28],[35],[36],[38]	21.9
Fair Value, ending balance		31.3	[13],[33],[34],[37]			21.9	[1],[11],[28],[35],[36],[38]
Investment, Identifier [Axis]: ATX Networks Corp, Class B-1 Common Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		5.0			0.0	0.0
Gross Additions		0.0	[2]			5.0	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0				0.0
Fair Value, ending balance		5.0				5.0
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: ATX Networks Corp, Class B-1 Common Stock, Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[28],[35]	5.0
Fair Value, ending balance		5.0	[13],[14],[32],[33],[34]			5.0	[1],[11],[27],[28],[35]
Investment, Identifier [Axis]: ATX Networks Corp, Class B-2 Common Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		9.0			0.0	0.0
Gross Additions		0.0	[2]			4.0	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0				5.0
Fair Value, ending balance		9.0				9.0
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: ATX Networks Corp, Class B-2 Common Stock, Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[28],[35]	9.0
Fair Value, ending balance		9.0	[13],[14],[32],[33],[34]			9.0	[1],[11],[27],[28],[35]
Investment, Identifier [Axis]: ATX Networks Corp, Common Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		29.2			0.0	0.0
Gross Additions		8.2	[2]			1.7	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		1.1				27.5
Fair Value, ending balance		38.5				29.2
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: ATX Networks Corp, Common Stock, Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[28],[35],[36],[38]	29.2
Fair Value, ending balance		38.5	[13],[14],[32],[33],[34],[37]			29.2	[1],[11],[27],[28],[35],[36],[38]
Investment, Identifier [Axis]: AVF Parent LLC, Trade Claim, Retailing
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27]	0.0
Fair Value, ending balance	[1],[11],[27]					0.0
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Common Stock, Energy
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27]	0.5
Fair Value, ending balance		0.6	[13],[14],[32]			0.5	[1],[11],[27]
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Preferred Stock, Energy
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27]	3.7
Fair Value, ending balance		4.0	[13],[14],[32]			3.7	[1],[11],[27]
Investment, Identifier [Axis]: Abacus JV, Private Equity, Insurance
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	53.3
Fair Value, ending balance		49.2	[13],[14],[33]			53.3	[1],[11],[28]
Investment, Identifier [Axis]: Accelerator Investments Aggregator LP, Private Equity, Diversified Financials
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[28]	3.4
Fair Value, ending balance	[1],[11],[27],[28]					3.4
Investment, Identifier [Axis]: Accelerator Investments Aggregator LP, Private Equity, Financial Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[32],[33]	3.5
Investment, Identifier [Axis]: Accuride Corp, Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[39]	7.6
Fair Value, ending balance		7.1	[14],[18],[40]			7.6	[1],[10],[39]
Investment, Identifier [Axis]: Advanced Dermatology & Cosmetic Surgery, Health Care Equipment & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[21],[41]	45.6
Fair Value, ending balance		45.5	[13],[14],[23],[42]			45.6	[1],[11],[21],[41]
Investment, Identifier [Axis]: Advanced Dermatology & Cosmetic Surgery, Health Care Equipment & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	2.2
Fair Value, ending balance		3.5	[14],[19]			2.2	[1],[15]
Investment, Identifier [Axis]: Advanced Dermatology & Cosmetic Surgery, Health Care Equipment & Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	3.5
Fair Value, ending balance		2.2	[14],[19]			3.5	[1],[15]
Investment, Identifier [Axis]: Advanced Lighting Technologies Inc, Materials
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[24],[27]	3.4
Fair Value, ending balance	[1],[11],[24],[27]					3.4
Investment, Identifier [Axis]: Advania Sverige AB, Software & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	86.0
Fair Value, ending balance		87.7	[13],[14],[33]			86.0	[1],[11],[28]
Investment, Identifier [Axis]: Advania Sverige AB, Software & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	9.2
Fair Value, ending balance		9.6	[13],[14],[33]			9.2	[1],[11],[28]
Investment, Identifier [Axis]: Affordable Care Inc
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		53.1
Gross Additions	[2]	2.9
Gross Reductions	[4]	(1.5)
Net Realized Gain (Loss)		0.0
Net Change in Unrealized Appreciation (Depreciation)		0.7
Fair Value, ending balance		55.2				53.1
Investment Income	[6]	1.3
PIK Income	[6]	0.2
Fee income	[6]	0.0
Dividend and Other Income	[6]	0.0
Investment, Identifier [Axis]: Affordable Care Inc, Health Care Equipment & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[41],[43]	52.5
Fair Value, ending balance		55.7	[13],[14],[42],[44]			52.5	[1],[11],[41],[43]
Investment, Identifier [Axis]: Affordable Care Inc, Health Care Equipment & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[43]	1.4
Fair Value, ending balance		12.7	[14],[19],[44]			1.4	[1],[11],[43]
Investment, Identifier [Axis]: Affordable Care Inc, Health Care Equipment & Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15],[43]	27.8
Fair Value, ending balance		25.3	[14],[19],[44]			27.8	[1],[15],[43]
Investment, Identifier [Axis]: Affordable Care Inc, Health Care Equipment & Services 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15],[43]	11.2
Fair Value, ending balance	[1],[15],[43]					11.2
Investment, Identifier [Axis]: Affordable Care Inc, Preferred Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		49.9
Gross Additions	[2]	0.0
Gross Reductions	[4]	0.0
Net Realized Gain (Loss)		0.0
Net Change in Unrealized Appreciation (Depreciation)		(0.8)
Fair Value, ending balance		49.1				49.9
Investment Income	[6]	0.0
PIK Income	[6]	1.4
Fee income	[6]	0.0
Dividend and Other Income	[6]	0.0
Investment, Identifier [Axis]: Affordable Care Inc, Preferred Stock, Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[43]	49.9
Fair Value, ending balance		49.1	[13],[14],[44]			49.9	[1],[11],[43]
Investment, Identifier [Axis]: Affordable Care Inc, Senior Secured Loans—First Lien -1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.0	0.0
Gross Additions	[3]					0.0
Gross Reductions	[5]					0.0
Net Realized Gain (Loss)						0.0
Net Change in Unrealized Appreciation (Depreciation)						0.0
Fair Value, ending balance						0.0
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Affordable Care Inc, Senior Secured Loans—First Lien -2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		53.1			59.9	59.9
Gross Additions	[3]					16.2
Gross Reductions	[5]					(21.4)
Net Realized Gain (Loss)						0.0
Net Change in Unrealized Appreciation (Depreciation)						(1.6)
Fair Value, ending balance						53.1
Investment Income	[7]					4.1
PIK Income	[7]					0.0
Fee income	[7]					0.2
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Alacrity Solutions Group LLC, Insurance 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	27.3
Fair Value, ending balance		4.7	[13],[14]			27.3	[1],[11]
Investment, Identifier [Axis]: Alacrity Solutions Group LLC, Insurance 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	10.4
Fair Value, ending balance		27.4	[13],[14],[42]			10.4	[1],[15]
Investment, Identifier [Axis]: Alacrity Solutions Group LLC, Insurance 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19]	5.7
Investment, Identifier [Axis]: Alera Group Intermediate Holdings Inc, Insurance 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[41]	8.7
Fair Value, ending balance		8.9	[14],[42]			8.7	[1],[41]
Investment, Identifier [Axis]: Alera Group Intermediate Holdings Inc, Insurance 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[41]	21.4
Fair Value, ending balance		21.8	[13],[14],[42]			21.4	[1],[11],[41]
Investment, Identifier [Axis]: Altavair AirFinance, Private Equity, Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	162.1
Fair Value, ending balance		144.2	[13],[14],[33]			162.1	[1],[11],[28]
Investment, Identifier [Axis]: American Vision Partners, Health Care Equipment & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[12]	109.1
Fair Value, ending balance		3.0	[13],[14]			109.1	[1],[11],[12]
Investment, Identifier [Axis]: American Vision Partners, Health Care Equipment & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	7.5
Fair Value, ending balance		71.5	[13],[14],[16]			7.5	[1],[15]
Investment, Identifier [Axis]: American Vision Partners, Health Care Equipment & Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14]	37.3
Investment, Identifier [Axis]: American Vision Partners, Health Care Equipment & Services 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19]	4.5
Investment, Identifier [Axis]: American Vision Partners, Private Equity, Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27]	2.2
Fair Value, ending balance		2.2	[13],[14],[32]			2.2	[1],[11],[27]
Investment, Identifier [Axis]: Amerivet Partners Management Inc, Health Care Equipment & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	91.8
Fair Value, ending balance		109.5	[13],[14]			91.8	[1],[11]
Investment, Identifier [Axis]: Amerivet Partners Management Inc, Health Care Equipment & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	16.6
Fair Value, ending balance		8.1	[14],[19]			16.6	[1],[11]
Investment, Identifier [Axis]: Amerivet Partners Management Inc, Health Care Equipment & Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	8.1
Fair Value, ending balance		47.0	[14],[19]			8.1	[1],[15]
Investment, Identifier [Axis]: Amerivet Partners Management Inc, Health Care Equipment & Services 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	48.2
Fair Value, ending balance	[1],[15]					48.2
Investment, Identifier [Axis]: Amerivet Partners Management Inc, Preferred Stock, Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	11.8
Fair Value, ending balance		11.7	[13],[14]			11.8	[1],[11]
Investment, Identifier [Axis]: Ammeraal Beltech Holding BV, Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[20],[28],[36]	23.0
Fair Value, ending balance		23.6	[13],[14],[22],[33],[37]			23.0	[1],[11],[20],[28],[36]
Investment, Identifier [Axis]: Amtek Global Technology Pte Ltd 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		3.9			34.8	34.8
Gross Additions	[3]					0.0
Gross Reductions	[5]					(24.3)
Net Realized Gain (Loss)						(4.3)
Net Change in Unrealized Appreciation (Depreciation)						(2.3)
Fair Value, ending balance						3.9
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Amtek Global Technology Pte Ltd 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.0	0.0
Gross Additions	[3]					0.0
Gross Reductions	[5]					0.0
Net Realized Gain (Loss)						(39.1)
Net Change in Unrealized Appreciation (Depreciation)						39.1
Fair Value, ending balance						0.0
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Amtek Global Technology Pte Ltd, Common Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.0	0.0
Gross Additions		0.0	[2]			0.0	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0				0.0
Fair Value, ending balance		0.0				0.0
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: Amtek Global Technology Pte Ltd, Common Stock, Automobiles & Components
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[28],[35],[45]	0.0
Fair Value, ending balance		0.0	[13],[14],[32],[33],[34],[46]			0.0	[1],[11],[27],[28],[35],[45]
Investment, Identifier [Axis]: Amtek Global Technology Pte Ltd, Ordinary Shares
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.0	0.0
Gross Additions		0.0	[2]			0.0	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0				0.0
Fair Value, ending balance		0.0				0.0
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: Amtek Global Technology Pte Ltd, Ordinary Shares, Automobiles & Components
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[28],[35]	0.0
Fair Value, ending balance		0.0	[13],[14],[32],[33],[34]			0.0	[1],[11],[27],[28],[35]
Investment, Identifier [Axis]: Amtek Global Technology Pte Ltd, Private Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.0	0.0
Gross Additions		0.0	[2]			0.0	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0				0.0
Fair Value, ending balance		0.0				0.0
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: Amtek Global Technology Pte Ltd, Private Equity, Automobiles & Components
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[28],[35]	0.0
Fair Value, ending balance		0.0	[13],[14],[32],[33],[34]			0.0	[1],[11],[27],[28],[35]
Investment, Identifier [Axis]: Angelica Corp, Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[24],[27],[47]	0.9
Fair Value, ending balance		0.9	[14],[29],[32],[48]			0.9	[1],[24],[27],[47]
Investment, Identifier [Axis]: Angelica Corp, Limited Partnership Interest, Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[27],[47]	0.0
Fair Value, ending balance	[1],[27],[47]					0.0
Investment, Identifier [Axis]: Apex Group Limited, Diversified Financials 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28],[39]	2.4
Fair Value, ending balance	[1],[11],[28],[39]					2.4
Investment, Identifier [Axis]: Apex Group Limited, Diversified Financials 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28],[39]	2.0
Fair Value, ending balance	[1],[11],[28],[39]					2.0
Investment, Identifier [Axis]: Apex Group Limited, Diversified Financials 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	51.7
Fair Value, ending balance	[1],[11],[28]					51.7
Investment, Identifier [Axis]: Apex Group Limited, Financial Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[33],[40],[42]	2.4
Investment, Identifier [Axis]: Apex Group Limited, Financial Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[33],[40]	2.1
Investment, Identifier [Axis]: Apex Group Limited, Financial Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[33]	53.3
Investment, Identifier [Axis]: Arcfield Acquisition Corp, Capital Goods 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[12],[21]	39.4
Fair Value, ending balance		39.6	[14],[16],[23]			39.4	[1],[12],[21]
Investment, Identifier [Axis]: Arcfield Acquisition Corp, Capital Goods 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	6.9
Fair Value, ending balance		7.0	[14],[19]			6.9	[1],[15]
Investment, Identifier [Axis]: Arcos LLC/VA, Preferred Stock, Software & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	13.4
Fair Value, ending balance		13.1	[13],[14]			13.4	[1],[11]
Investment, Identifier [Axis]: Arcos LLC/VA, Software & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[41]	11.4
Fair Value, ending balance		11.3	[14],[42]			11.4	[1],[41]
Investment, Identifier [Axis]: Arcos LLC/VA, Software & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	4.2
Fair Value, ending balance		4.1	[14],[19]			4.2	[1],[15]
Investment, Identifier [Axis]: Ardonagh Group Ltd, Insurance 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	0.9
Fair Value, ending balance		1.0	[13],[14],[33]			0.9	[1],[11],[28]
Investment, Identifier [Axis]: Ardonagh Group Ltd, Insurance 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	20.2
Fair Value, ending balance		20.3	[13],[14],[33]			20.2	[1],[11],[28]
Investment, Identifier [Axis]: Ardonagh Group Ltd, Insurance 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28],[39]	0.9
Fair Value, ending balance		9.7	[13],[14],[33]			0.9	[1],[11],[28],[39]
Investment, Identifier [Axis]: Ardonagh Group Ltd, Insurance 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19],[33]	9.7
Investment, Identifier [Axis]: Ardonagh Group Ltd, Insurance 5
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[33],[40]	0.9
Investment, Identifier [Axis]: Arena Energy LP, Warrants, Energy
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	0.5
Fair Value, ending balance		0.3	[13],[14]			0.5	[1],[11]
Investment, Identifier [Axis]: Arrotex Australia Group Pty Ltd, Pharmaceuticals, Biotechnology & Life Sciences 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	29.0
Fair Value, ending balance		28.5	[13],[14],[33]			29.0	[1],[11],[28]
Investment, Identifier [Axis]: Arrotex Australia Group Pty Ltd, Pharmaceuticals, Biotechnology & Life Sciences 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	2.1
Fair Value, ending balance		2.1	[13],[14],[33]			2.1	[1],[11],[28]
Investment, Identifier [Axis]: Ascent Resources Utica Holdings LLC / ARU Finance Corp, Common Stock, Energy
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[27],[49]	3.6
Fair Value, ending balance		2.8	[14],[32],[50]			3.6	[1],[27],[49]
Investment, Identifier [Axis]: Ascent Resources Utica Holdings LLC / ARU Finance Corp, Trade Claim, Energy
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[27],[49]	30.5
Fair Value, ending balance		23.4	[14],[32],[50]			30.5	[1],[27],[49]
Investment, Identifier [Axis]: Australis Maritime, Common Stock, Transportation
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	49.3
Fair Value, ending balance		53.7	[13],[14],[33]			49.3	[1],[11],[28]
Investment, Identifier [Axis]: Avenue One PropCo, Private Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		31.0			0.0	0.0
Gross Additions		4.1	[2]			46.3	[3]
Gross Reductions		0.0	[4]			(16.2)	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		(0.6)				0.9
Fair Value, ending balance		34.5				31.0
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: Avenue One PropCo, Private Equity, Equity Real Estate Investment Trusts (REITs)
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[32],[33],[34]	34.5
Investment, Identifier [Axis]: Avenue One PropCo, Private Equity, Real Estate
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[28],[35]	31.0
Fair Value, ending balance	[1],[11],[27],[28],[35]					31.0
Investment, Identifier [Axis]: Avida Holding AB, Common Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		42.6			52.3	52.3
Gross Additions		0.0	[2]			0.0	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		(7.1)				(9.7)
Fair Value, ending balance		35.5				42.6
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: Avida Holding AB, Common Stock, Diversified Financials
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[28],[35]	42.6
Fair Value, ending balance	[1],[11],[27],[28],[35]					42.6
Investment, Identifier [Axis]: Avida Holding AB, Common Stock, Financial Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[32],[33],[34]	35.5
Investment, Identifier [Axis]: AxiomSL Ltd, Software & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[20],[21],[41]	33.7
Fair Value, ending balance		33.8	[13],[14],[22],[23],[42]			33.7	[1],[11],[20],[21],[41]
Investment, Identifier [Axis]: AxiomSL Ltd, Software & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	2.4
Fair Value, ending balance		2.4	[14],[19]			2.4	[1],[15]
Investment, Identifier [Axis]: AxiomSL Ltd, Software & Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	2.2
Fair Value, ending balance		2.2	[14],[19]			2.2	[1],[15]
Investment, Identifier [Axis]: BGB Group LLC, Media & Entertainment 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[9],[10],[12],[20],[21],[41]	108.4
Fair Value, ending balance		107.3	[14],[16],[17],[18],[22],[23],[42]			108.4	[1],[9],[10],[12],[20],[21],[41]
Investment, Identifier [Axis]: BGB Group LLC, Media & Entertainment 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	19.5
Fair Value, ending balance		19.3	[14],[19]			19.5	[1],[15]
Investment, Identifier [Axis]: Bankers Healthcare Group LLC, Term Loan, Diversified Financials
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	11.3
Fair Value, ending balance	[1],[11],[28]					11.3
Investment, Identifier [Axis]: Bankers Healthcare Group LLC, Term Loan, Financial Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[33]	11.4
Investment, Identifier [Axis]: Barbri Inc, Consumer Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[9],[10],[20],[21],[41]	61.0
Fair Value, ending balance		60.9	[14],[17],[18],[22],[23],[42]			61.0	[1],[9],[10],[20],[21],[41]
Investment, Identifier [Axis]: Barbri Inc, Consumer Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[9],[10],[11]	69.7
Fair Value, ending balance		29.7	[13],[14]			69.7	[1],[9],[10],[11]
Investment, Identifier [Axis]: Barbri Inc, Consumer Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	9.1
Fair Value, ending balance		34.4	[14],[17],[18]			9.1	[1],[15]
Investment, Identifier [Axis]: Barbri Inc, Consumer Services 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14]	5.5
Investment, Identifier [Axis]: Barbri Inc, Consumer Services 5
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19]	9.1
Investment, Identifier [Axis]: Belk Inc 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		8.8
Gross Additions	[2]	0.9
Gross Reductions	[4]	(1.3)
Net Realized Gain (Loss)		0.2
Net Change in Unrealized Appreciation (Depreciation)		3.9
Fair Value, ending balance		12.5				8.8
Investment Income	[6]	0.0
PIK Income	[6]	0.0
Fee income	[6]	0.0
Dividend and Other Income	[6]	0.0
Investment, Identifier [Axis]: Belk Inc 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		19.4
Gross Additions	[2]	0.0
Gross Reductions	[4]	0.0
Net Realized Gain (Loss)		0.0
Net Change in Unrealized Appreciation (Depreciation)		(0.7)
Fair Value, ending balance		18.7				19.4
Investment Income	[6]	0.7
PIK Income	[6]	0.0
Fee income	[6]	0.0
Dividend and Other Income	[6]	0.0
Investment, Identifier [Axis]: Belk Inc 2, Senior Secured Loans—First Lien -1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		19.4			21.9	21.9
Gross Additions	[3]					0.1
Gross Reductions	[5]					0.0
Net Realized Gain (Loss)						0.0
Net Change in Unrealized Appreciation (Depreciation)						(2.6)
Fair Value, ending balance						19.4
Investment Income	[7]					2.2
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Belk Inc 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		3.3
Gross Additions	[2]	0.0
Gross Reductions	[4]	0.0
Net Realized Gain (Loss)		0.0
Net Change in Unrealized Appreciation (Depreciation)		(3.3)
Fair Value, ending balance		0.0				3.3
Investment Income	[6]	0.0
PIK Income	[6]	0.0
Fee income	[6]	0.0
Dividend and Other Income	[6]	0.0
Investment, Identifier [Axis]: Belk Inc, Common Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0
Gross Additions	[2]	0.0
Gross Reductions	[4]	0.0
Net Realized Gain (Loss)		0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0
Fair Value, ending balance		0.0				0.0
Investment Income	[6]	0.0
PIK Income	[6]	0.0
Fee income	[6]	0.0
Dividend and Other Income	[6]	0.0
Investment, Identifier [Axis]: Belk Inc, Common Stock, Consumer Discretionary Distribution & Retail
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[32],[44]	0.0
Investment, Identifier [Axis]: Belk Inc, Common Stock, Equity/Other
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.0	0.0
Gross Additions	[3]					0.0
Gross Reductions	[5]					0.0
Net Realized Gain (Loss)						0.0
Net Change in Unrealized Appreciation (Depreciation)						0.0
Fair Value, ending balance						0.0
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Belk Inc, Common Stock, Retailing
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[43]	0.0
Fair Value, ending balance	[1],[11],[27],[43]					0.0
Investment, Identifier [Axis]: Belk Inc, Consumer Discretionary Distribution & Retail 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[40],[44]	18.7
Investment, Identifier [Axis]: Belk Inc, Consumer Discretionary Distribution & Retail 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[29],[32],[40],[44]	12.5
Investment, Identifier [Axis]: Belk Inc, Consumer Discretionary Distribution & Retail 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[29],[32],[44]	0.0
Investment, Identifier [Axis]: Belk Inc, Retailing 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[39],[43]	19.4
Fair Value, ending balance	[1],[11],[39],[43]					19.4
Investment, Identifier [Axis]: Belk Inc, Retailing 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[24],[27],[39],[43]	8.8
Fair Value, ending balance	[1],[11],[24],[27],[39],[43]					8.8
Investment, Identifier [Axis]: Belk Inc, Retailing 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[24],[27],[43]	3.3
Fair Value, ending balance	[1],[11],[24],[27],[43]					3.3
Investment, Identifier [Axis]: Belk Inc, Senior Secured Loans—First Lien -2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		8.8			49.2	49.2
Gross Additions	[3]					4.7
Gross Reductions	[5]					(2.2)
Net Realized Gain (Loss)						(0.2)
Net Change in Unrealized Appreciation (Depreciation)						(42.7)
Fair Value, ending balance						8.8
Investment Income	[7]					3.7
PIK Income	[7]					2.7
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Borden (New Dairy Opco) 2, Senior Secured Loans—First Lien
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			42.0	42.0
Gross Additions	[3]					0.1
Gross Reductions	[5]					(42.0)
Net Realized Gain (Loss)						1.7
Net Change in Unrealized Appreciation (Depreciation)						(1.8)
Fair Value, ending balance						0.0
Investment Income	[7]					0.9
PIK Income	[7]					0.0
Fee income	[7]					1.3
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Borden (New Dairy Opco), Common Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		4.8
Gross Additions	[2]	0.0
Gross Reductions	[4]	0.0
Net Realized Gain (Loss)		0.0
Net Change in Unrealized Appreciation (Depreciation)		1.9
Fair Value, ending balance		6.7				4.8
Investment Income	[6]	0.0
PIK Income	[6]	0.0
Fee income	[6]	0.0
Dividend and Other Income	[6]	0.0
Investment, Identifier [Axis]: Borden (New Dairy Opco), Common Stock, Equity/Other
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		4.8			7.7	7.7
Gross Additions	[3]					0.0
Gross Reductions	[5]					0.0
Net Realized Gain (Loss)						0.0
Net Change in Unrealized Appreciation (Depreciation)						(2.9)
Fair Value, ending balance						4.8
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Borden (New Dairy Opco), Common Stock, Food, Beverage & Tobacco
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[27],[43],[47],[51]	4.8
Fair Value, ending balance		6.7	[14],[32],[44],[48],[52]			4.8	[1],[27],[43],[47],[51]
Investment, Identifier [Axis]: Borden (New Dairy Opco), Senior Secured Loans—First Lien -2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			9.0	9.0
Gross Additions	[3]					0.0
Gross Reductions	[5]					(9.0)
Net Realized Gain (Loss)						0.6
Net Change in Unrealized Appreciation (Depreciation)						(0.6)
Fair Value, ending balance						0.0
Investment Income	[7]					0.1
PIK Income	[7]					0.0
Fee income	[7]					0.3
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Borden Dairy Co, Senior Secured Loans—First Lien
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.0	0.0
Gross Additions	[3]					0.0
Gross Reductions	[5]					0.0
Net Realized Gain (Loss)						(25.4)
Net Change in Unrealized Appreciation (Depreciation)						25.4
Fair Value, ending balance						0.0
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Bowery Farming Inc, Food, Beverage & Tobacco
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	70.3
Fair Value, ending balance		70.2	[13],[14]			70.3	[1],[11]
Investment, Identifier [Axis]: Bowery Farming Inc, Warrants, Food, Beverage & Tobacco
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27]	2.5
Fair Value, ending balance		2.1	[13],[14],[32]			2.5	[1],[11],[27]
Investment, Identifier [Axis]: Byrider Finance LLC, Private Equity, Automobiles & Components
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28],[53]	0.0
Fair Value, ending balance		0.0	[13],[14],[32],[54]			0.0	[1],[11],[28],[53]
Investment, Identifier [Axis]: Byrider Finance LLC, Structured Mezzanine, Automobiles & Components 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	16.1
Fair Value, ending balance	[1],[11]					16.1
Investment, Identifier [Axis]: Byrider Finance LLC, Structured Mezzanine, Automobiles & Components 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	6.8
Fair Value, ending balance	[1],[15]					6.8
Investment, Identifier [Axis]: Byrider Finance LLC, Term Loan, Automobiles & Components
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28],[53]	5.0
Fair Value, ending balance		3.9	[13],[14],[32],[54]			5.0	[1],[11],[28],[53]
Investment, Identifier [Axis]: CDS US Intermediate Holdings Inc, Warrant, Media & Entertainment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[28]	4.0
Fair Value, ending balance		4.4	[13],[14],[32],[33]			4.0	[1],[11],[27],[28]
Investment, Identifier [Axis]: CFC Underwriting Ltd, Insurance
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15],[28]	5.7
Fair Value, ending balance		5.7	[14],[19],[33]			5.7	[1],[15],[28]
Investment, Identifier [Axis]: CSafe Global, Capital Goods 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[9],[10],[11],[12],[20],[21],[41]	186.8
Fair Value, ending balance		186.5	[13],[14],[16],[17],[18],[22],[23],[42]			186.8	[1],[9],[10],[11],[12],[20],[21],[41]
Investment, Identifier [Axis]: CSafe Global, Capital Goods 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	32.8
Fair Value, ending balance		33.5	[13],[14]			32.8	[1],[11]
Investment, Identifier [Axis]: CSafe Global, Capital Goods 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	11.8
Fair Value, ending balance		11.8	[13],[14],[42]			11.8	[1],[11]
Investment, Identifier [Axis]: CSafe Global, Capital Goods 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	34.7
Fair Value, ending balance		34.7	[14],[19]			34.7	[1],[15]
Investment, Identifier [Axis]: CTI Foods Holding Co LLC, Common Stock, Food, Beverage & Tobacco
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27]	0.0
Fair Value, ending balance		0.0	[13],[14],[32]			0.0	[1],[11],[27]
Investment, Identifier [Axis]: Caldic BV, Consumer Discretionary Distribution & Retail 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[33],[40]	0.9
Investment, Identifier [Axis]: Caldic BV, Consumer Discretionary Distribution & Retail 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[33],[40],[42]	1.4
Investment, Identifier [Axis]: Caldic BV, Consumer Discretionary Distribution & Retail 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[33]	39.0
Investment, Identifier [Axis]: Caldic BV, Retailing 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28],[39]	0.8
Fair Value, ending balance	[1],[11],[28],[39]					0.8
Investment, Identifier [Axis]: Caldic BV, Retailing 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28],[39]	1.4
Fair Value, ending balance	[1],[11],[28],[39]					1.4
Investment, Identifier [Axis]: Caldic BV, Retailing 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	38.2
Fair Value, ending balance	[1],[11],[28]					38.2
Investment, Identifier [Axis]: Callodine Commercial Finance LLC, 2L Term Loan A, Diversified Financials
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	125.3
Fair Value, ending balance	[1],[11]					125.3
Investment, Identifier [Axis]: Callodine Commercial Finance LLC, 2L Term Loan A, Financial Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14]	125.6
Investment, Identifier [Axis]: Callodine Commercial Finance LLC, 2L Term Loan B, Diversified Financials 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	12.0
Fair Value, ending balance	[1],[11]					12.0
Investment, Identifier [Axis]: Callodine Commercial Finance LLC, 2L Term Loan B, Diversified Financials 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	36.1
Fair Value, ending balance	[1],[15]					36.1
Investment, Identifier [Axis]: Callodine Commercial Finance LLC, 2L Term Loan B, Financial Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14]	12.1
Investment, Identifier [Axis]: Callodine Commercial Finance LLC, 2L Term Loan B, Financial Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19]	36.2
Investment, Identifier [Axis]: Capital Automotive LP, Private Equity, Equity Real Estate Investment Trusts (REITs)
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[33]	31.1
Investment, Identifier [Axis]: Capital Automotive LP, Private Equity, Real Estate
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	27.0
Fair Value, ending balance	[1],[11],[28]					27.0
Investment, Identifier [Axis]: Capital Automotive LP, Structured Mezzanine, Equity Real Estate Investment Trusts (REITs)
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[33]	41.9
Investment, Identifier [Axis]: Capital Automotive LP, Structured Mezzanine, Real Estate
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	42.4
Fair Value, ending balance	[1],[11],[28]					42.4
Investment, Identifier [Axis]: Careismatic Brands Inc, Health Care Equipment & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14]	15.0
Investment, Identifier [Axis]: Careismatic Brands Inc, Health Care Equipment & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19]	15.0
Investment, Identifier [Axis]: Catalina Marketing Corp, Common Stock, Media & Entertainment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27]	0.0
Fair Value, ending balance	[1],[11],[27]					0.0
Investment, Identifier [Axis]: Cengage Learning, Inc, Common Stock, Media & Entertainment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27]	3.6
Fair Value, ending balance		3.6	[13],[14],[32]			3.6	[1],[11],[27]
Investment, Identifier [Axis]: Cimarron Energy Inc, Common Stock, Energy
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27]	0.0
Fair Value, ending balance	[1],[11],[27]					0.0
Investment, Identifier [Axis]: Cimarron Energy Inc, Energy
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[24],[27]	3.7
Fair Value, ending balance	[1],[11],[24],[27]					3.7
Investment, Identifier [Axis]: Cimarron Energy Inc, Participation Option, Energy
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27]	0.0
Fair Value, ending balance	[1],[11],[27]					0.0
Investment, Identifier [Axis]: Circana Group (f.k.a. NPD Group), Consumer Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14]	0.1
Investment, Identifier [Axis]: Circana Group (f.k.a. NPD Group), Consumer Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[42]	19.5
Investment, Identifier [Axis]: Circana Group (f.k.a. NPD Group), Consumer Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19]	0.9
Investment, Identifier [Axis]: Clarience Technologies LLC, Capital Goods 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[9],[11],[12],[20],[36],[41]	287.9
Fair Value, ending balance		287.7	[13],[14],[16],[17],[22],[37],[42]			287.9	[1],[9],[11],[12],[20],[36],[41]
Investment, Identifier [Axis]: Clarience Technologies LLC, Capital Goods 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	24.9
Fair Value, ending balance		25.0	[14],[19]			24.9	[1],[15]
Investment, Identifier [Axis]: Community Brands Inc, Software & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	31.6
Fair Value, ending balance		31.5	[13],[14]			31.6	[1],[11]
Investment, Identifier [Axis]: Community Brands Inc, Software & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	3.7
Fair Value, ending balance		3.7	[14],[19]			3.7	[1],[15]
Investment, Identifier [Axis]: Community Brands Inc, Software & Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	1.9
Fair Value, ending balance		1.9	[14],[19]			1.9	[1],[15]
Investment, Identifier [Axis]: Constellis Holdings LLC , Senior Secured Loans—Second Lien
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		13.5			12.0	12.0
Gross Additions	[3]					0.3
Gross Reductions	[5]					0.0
Net Realized Gain (Loss)						0.0
Net Change in Unrealized Appreciation (Depreciation)						1.2
Fair Value, ending balance						13.5
Investment Income	[7]					2.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Constellis Holdings LLC 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		15.0
Gross Additions	[2]	0.1
Gross Reductions	[4]	0.0
Net Realized Gain (Loss)		0.0
Net Change in Unrealized Appreciation (Depreciation)		(0.1)
Fair Value, ending balance		15.0				15.0
Investment Income	[6]	0.6
PIK Income	[6]	0.0
Fee income	[6]	0.0
Dividend and Other Income	[6]	0.0
Investment, Identifier [Axis]: Constellis Holdings LLC 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		13.5
Gross Additions	[2]	0.0
Gross Reductions	[4]	0.0
Net Realized Gain (Loss)		0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0
Fair Value, ending balance		13.5				13.5
Investment Income	[6]	0.6
PIK Income	[6]	0.0
Fee income	[6]	0.0
Dividend and Other Income	[6]	0.0
Investment, Identifier [Axis]: Constellis Holdings LLC, Capital Goods 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[43]	15.0
Fair Value, ending balance		15.0	[13],[14],[44]			15.0	[1],[11],[43]
Investment, Identifier [Axis]: Constellis Holdings LLC, Capital Goods 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[43]	13.5
Fair Value, ending balance		13.5	[13],[14],[44]			13.5	[1],[11],[43]
Investment, Identifier [Axis]: Constellis Holdings LLC, Private Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		6.3
Gross Additions	[2]	0.0
Gross Reductions	[4]	0.0
Net Realized Gain (Loss)		0.0
Net Change in Unrealized Appreciation (Depreciation)		(2.4)
Fair Value, ending balance		3.9				6.3
Investment Income	[6]	0.0
PIK Income	[6]	0.0
Fee income	[6]	0.0
Dividend and Other Income	[6]	0.0
Investment, Identifier [Axis]: Constellis Holdings LLC, Private Equity, Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[20],[27],[43]	6.3
Fair Value, ending balance		3.9	[13],[14],[22],[32],[44]			6.3	[1],[11],[20],[27],[43]
Investment, Identifier [Axis]: Constellis Holdings LLC, Private Equity, Equity/Other
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		6.3			0.2	0.2
Gross Additions	[3]					0.0
Gross Reductions	[5]					0.0
Net Realized Gain (Loss)						0.0
Net Change in Unrealized Appreciation (Depreciation)						6.1
Fair Value, ending balance						6.3
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Constellis Holdings LLC, Senior Secured Loans—First Lien -1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		15.0			15.0	15.0
Gross Additions	[3]					0.4
Gross Reductions	[5]					0.0
Net Realized Gain (Loss)						0.0
Net Change in Unrealized Appreciation (Depreciation)						(0.4)
Fair Value, ending balance						15.0
Investment Income	[7]					1.8
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Corsearch Intermediate Inc, Software & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[41]	29.8
Fair Value, ending balance		29.9	[13],[14],[42]			29.8	[1],[11],[41]
Investment, Identifier [Axis]: Corsearch Intermediate Inc, Software & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	4.4
Fair Value, ending balance		4.4	[14],[19]			4.4	[1],[15]
Investment, Identifier [Axis]: Covis Finco Sarl, Pharmaceuticals, Biotechnology & Life Sciences
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[19],[33]	20.0
Investment, Identifier [Axis]: Credit Opportunities Partners JV, LLC 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		1,428.3			1,396.2	1,396.2
Gross Additions		0.0	[2]			175.0	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		(31.7)				(142.9)
Fair Value, ending balance		1,396.6				1,428.3
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		57.5	[6]			208.3	[7]
Investment, Identifier [Axis]: Credit Opportunities Partners JV, LLC, Diversified Financials
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28],[35]	1,428.3
Fair Value, ending balance	[1],[11],[28],[35]					1,428.3
Investment, Identifier [Axis]: Credit Opportunities Partners JV, LLC, Financial Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[33],[34]	1,396.6
Investment, Identifier [Axis]: Cubic Corp, Preferred Stock, Software & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	34.7
Fair Value, ending balance		33.3	[13],[14]			34.7	[1],[11]
Investment, Identifier [Axis]: Cubic Corp, Software & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	40.6
Fair Value, ending balance		40.4	[13],[14]			40.6	[1],[11]
Investment, Identifier [Axis]: DOC Generici Srl, Pharmaceuticals, Biotechnology & Life Sciences 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	24.1
Fair Value, ending balance		24.6	[13],[14],[33]			24.1	[1],[11],[28]
Investment, Identifier [Axis]: DOC Generici Srl, Pharmaceuticals, Biotechnology & Life Sciences 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15],[28]	2.2
Fair Value, ending balance		0.1	[13],[14],[33]			2.2	[1],[15],[28]
Investment, Identifier [Axis]: DOC Generici Srl, Pharmaceuticals, Biotechnology & Life Sciences 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[15],[28]	2.2
Investment, Identifier [Axis]: Dental Care Alliance Inc, Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[17],[22],[23],[42]	134.5
Investment, Identifier [Axis]: Dental Care Alliance Inc, Health Care Equipment & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[9],[11],[20],[21],[41]	132.7
Fair Value, ending balance	[1],[9],[11],[20],[21],[41]					132.7
Investment, Identifier [Axis]: Dental Care Alliance Inc, Health Care Equipment & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	1.6
Fair Value, ending balance	[1],[15]					1.6
Investment, Identifier [Axis]: Element Materials Technology Group US Holdings Inc, Commercial & Professional Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28],[39]	0.4
Fair Value, ending balance		1.4	[13],[14],[40],[42]			0.4	[1],[11],[28],[39]
Investment, Identifier [Axis]: Element Materials Technology Group US Holdings Inc, Commercial & Professional Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28],[39]	1.4
Fair Value, ending balance		0.4	[13],[14],[33],[40]			1.4	[1],[11],[28],[39]
Investment, Identifier [Axis]: Element Materials Technology Group US Holdings Inc, Commercial & Professional Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	64.6
Fair Value, ending balance		67.3	[13],[33]			64.6	[1],[11],[28]
Investment, Identifier [Axis]: Ellucian Inc, Software & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	177.5
Fair Value, ending balance		181.1	[13],[14]			177.5	[1],[11]
Investment, Identifier [Axis]: Encora Digital Inc, Commercial & Professional Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14]	18.9
Investment, Identifier [Axis]: Encora Digital Inc, Commercial & Professional Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14]	62.6
Investment, Identifier [Axis]: Encora Digital Inc, Commercial & Professional Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13]	22.6
Investment, Identifier [Axis]: Encora Digital Inc, Software & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	61.7
Fair Value, ending balance	[1],[11]					61.7
Investment, Identifier [Axis]: Encora Digital Inc, Software & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	18.6
Fair Value, ending balance	[1],[15]					18.6
Investment, Identifier [Axis]: Encora Digital Inc, Software & Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	22.6
Fair Value, ending balance	[1],[11]					22.6
Investment, Identifier [Axis]: Envigo Laboratories Inc, Series A Warrant, Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[27],[36]	0.0
Fair Value, ending balance	[1],[27],[36]					0.0
Investment, Identifier [Axis]: Envigo Laboratories Inc, Series B Warrant, Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[27],[36]	0.0
Fair Value, ending balance	[1],[27],[36]					0.0
Investment, Identifier [Axis]: Envirotainer Ltd, Transportation
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15],[28]	2.6
Fair Value, ending balance	[15],[28]	2.7	[14]			2.6	[1]
Investment, Identifier [Axis]: Excelitas Technologies Corp, Technology Hardware & Equipment 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	1.3
Fair Value, ending balance		0.9	[13],[14]			1.3	[1],[11]
Investment, Identifier [Axis]: Excelitas Technologies Corp, Technology Hardware & Equipment 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	1.0
Fair Value, ending balance		1.6	[13],[14]			1.0	[1],[15]
Investment, Identifier [Axis]: Excelitas Technologies Corp, Technology Hardware & Equipment 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	4.6
Fair Value, ending balance		1.4	[14],[19]			4.6	[1],[15]
Investment, Identifier [Axis]: Excelitas Technologies Corp, Technology Hardware & Equipment 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19]	3.0
Investment, Identifier [Axis]: Fairway Group Holdings Corp 2, Senior Secured Loans—First Lien -1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.0	0.0
Gross Additions	[3]					0.0
Gross Reductions	[5]					0.0
Net Realized Gain (Loss)						0.0
Net Change in Unrealized Appreciation (Depreciation)						0.0
Fair Value, ending balance						0.0
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Fairway Group Holdings Corp, Common Stock, Equity/Other
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.0	0.0
Gross Additions	[3]					0.0
Gross Reductions	[5]					0.0
Net Realized Gain (Loss)						0.0
Net Change in Unrealized Appreciation (Depreciation)						0.0
Fair Value, ending balance						0.0
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Fairway Group Holdings Corp, Senior Secured Loans—First Lien -2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.7	0.7
Gross Additions	[3]					0.0
Gross Reductions	[5]					0.0
Net Realized Gain (Loss)						(1.0)
Net Change in Unrealized Appreciation (Depreciation)						0.3
Fair Value, ending balance						0.0
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Follett Software Co, Software & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[9],[10],[20],[21]	72.1
Fair Value, ending balance		72.5	[14],[17],[18],[22],[23]			72.1	[1],[9],[10],[20],[21]
Investment, Identifier [Axis]: Follett Software Co, Software & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	9.7
Fair Value, ending balance		9.7	[14],[19]			9.7	[1],[15]
Investment, Identifier [Axis]: Foundation Consumer Brands LLC, Pharmaceuticals, Biotechnology & Life Sciences 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[20],[41]	84.7
Fair Value, ending balance		82.3	[13],[14],[22],[42]			84.7	[1],[11],[20],[41]
Investment, Identifier [Axis]: Foundation Consumer Brands LLC, Pharmaceuticals, Biotechnology & Life Sciences 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	6.6
Fair Value, ending balance		6.6	[14],[19]			6.6	[1],[15]
Investment, Identifier [Axis]: Foundation Risk Partners Corp, Insurance 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	2.8
Fair Value, ending balance		77.3	[13],[14],[42]			2.8	[1],[11]
Investment, Identifier [Axis]: Foundation Risk Partners Corp, Insurance 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[41]	78.1
Fair Value, ending balance		6.8	[14],[19]			78.1	[1],[11],[41]
Investment, Identifier [Axis]: Foundation Risk Partners Corp, Insurance 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	4.0
Fair Value, ending balance	[1],[15]					4.0
Investment, Identifier [Axis]: Fox Head Inc, Common Stock, Consumer Durables & Apparel
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27]	0.0
Fair Value, ending balance		0.0	[13],[14],[55]			0.0	[1],[11],[27]
Investment, Identifier [Axis]: Fronton BV, Common Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		1.0
Gross Additions	[2]	0.0
Gross Reductions	[4]	0.0
Net Realized Gain (Loss)		0.0
Net Change in Unrealized Appreciation (Depreciation)		0.2
Fair Value, ending balance		1.2				1.0
Investment Income	[6]	0.0
PIK Income	[6]	0.0
Fee income	[6]	0.0
Dividend and Other Income	[6]	0.0
Investment, Identifier [Axis]: Fronton BV, Common Stock, Consumer Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[43]	1.0
Fair Value, ending balance		1.2	[14],[32],[52]			1.0	[1],[11],[27],[43]
Investment, Identifier [Axis]: Galaxy Universal LLC, Common Stock, Consumer Durables & Apparel
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[27],[51]	7.5
Fair Value, ending balance		0.0	[14],[32],[52]			7.5	[1],[27],[51]
Investment, Identifier [Axis]: Galaxy Universal LLC, Consumer Durables & Apparel 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	7.5
Fair Value, ending balance		7.5	[13],[14]			7.5	[1],[11]
Investment, Identifier [Axis]: Galaxy Universal LLC, Consumer Durables & Apparel 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	85.3
Fair Value, ending balance		84.6	[13],[14]			85.3	[1],[11]
Investment, Identifier [Axis]: Galaxy Universal LLC, Consumer Durables & Apparel 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	21.2
Fair Value, ending balance		17.8	[13],[14]			21.2	[1],[11]
Investment, Identifier [Axis]: Galaxy Universal LLC, Trade Claim, Consumer Durables & Apparel
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27]	1.7
Fair Value, ending balance		1.8	[13],[14],[32]			1.7	[1],[11],[27]
Investment, Identifier [Axis]: Galway Partners Holdings LLC, Insurance 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[9],[10],[11],[21],[41]	109.7
Fair Value, ending balance		2.5	[13],[14]			109.7	[1],[9],[10],[11],[21],[41]
Investment, Identifier [Axis]: Galway Partners Holdings LLC, Insurance 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	11.8
Fair Value, ending balance		108.9	[13],[14],[17],[18],[23],[42]			11.8	[1],[15]
Investment, Identifier [Axis]: Galway Partners Holdings LLC, Insurance 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	1.3
Fair Value, ending balance		9.2	[14],[19]			1.3	[1],[15]
Investment, Identifier [Axis]: Galway Partners Holdings LLC, Insurance 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19]	1.3
Investment, Identifier [Axis]: General Datatech LP, Software & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[9],[10],[11],[20],[21],[41]	146.5
Fair Value, ending balance		148.9	[13],[14],[17],[18],[22],[23],[42]			146.5	[1],[9],[10],[11],[20],[21],[41]
Investment, Identifier [Axis]: Genesys Telecommunications Laboratories Inc, Class A Shares, Technology Hardware & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27]	0.0
Fair Value, ending balance	[1],[11],[27]					0.0
Investment, Identifier [Axis]: Genesys Telecommunications Laboratories Inc, Ordinary Shares, Technology Hardware & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[13],[32]	0.0
Fair Value, ending balance	[1],[13],[32]					0.0
Investment, Identifier [Axis]: Genesys Telecommunications Laboratories Inc, Preferred Stock, Technology Hardware & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[13],[32]	0.0
Fair Value, ending balance	[1],[13],[32]					0.0
Investment, Identifier [Axis]: Gigamon Inc, Software & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	163.2
Fair Value, ending balance		164.7	[13],[14]			163.2	[1],[11]
Investment, Identifier [Axis]: Gigamon Inc, Software & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	8.9
Fair Value, ending balance		9.1	[14],[19]			8.9	[1],[15]
Investment, Identifier [Axis]: Global Jet Capital LLC, Preferred Stock, Commercial & Professional Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[53],[56]	0.0
Fair Value, ending balance		0.0	[13],[14],[32],[54],[55]			0.0	[1],[11],[27],[53],[56]
Investment, Identifier [Axis]: Global Jet Capital LLC, Preferred Stock, Commercial & Professional Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[24],[27],[53],[56]	232.2
Fair Value, ending balance		238.8	[13],[14],[29],[32],[54],[55]			232.2	[1],[11],[24],[27],[53],[56]
Investment, Identifier [Axis]: Global Jet Capital LLC, Structured Mezzanine, Commercial & Professional Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28],[53],[56]	28.0
Fair Value, ending balance		16.7	[13],[14],[33],[54],[55]			28.0	[1],[11],[28],[53],[56]
Investment, Identifier [Axis]: Global Jet Capital LLC, Structured Mezzanine, Commercial & Professional Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28],[53],[56]	20.5
Fair Value, ending balance		12.2	[13],[14],[33],[54],[55]			20.5	[1],[11],[28],[53],[56]
Investment, Identifier [Axis]: Global Jet Capital LLC, Structured Mezzanine, Commercial & Professional Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28],[53],[56]	2.4
Fair Value, ending balance		1.4	[13],[14],[33],[54],[55]			2.4	[1],[11],[28],[53],[56]
Investment, Identifier [Axis]: Global Lending Services LLC, Private Equity, Diversified Financials 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	8.2
Fair Value, ending balance	[1],[11],[28]					8.2
Investment, Identifier [Axis]: Global Lending Services LLC, Private Equity, Diversified Financials 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	10.9
Fair Value, ending balance	[1],[11],[28]					10.9
Investment, Identifier [Axis]: Global Lending Services LLC, Private Equity, Diversified Financials 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[28]	10.0
Fair Value, ending balance	[1],[11],[27],[28]					10.0
Investment, Identifier [Axis]: Global Lending Services LLC, Private Equity, Financial Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[33]	7.2
Investment, Identifier [Axis]: Global Lending Services LLC, Private Equity, Financial Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[33]	9.8
Investment, Identifier [Axis]: Global Lending Services LLC, Private Equity, Financial Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[32],[33]	14.1
Investment, Identifier [Axis]: Gracent LLC, Health Care Equipment & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	22.1
Fair Value, ending balance		22.1	[13],[14]			22.1	[1],[11]
Investment, Identifier [Axis]: Gracent LLC, Health Care Equipment & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[24],[27]	11.4
Fair Value, ending balance		9.1	[13],[14],[29],[32]			11.4	[1],[11],[24],[27]
Investment, Identifier [Axis]: Gracent LLC, NP-1 Common Stock, Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[27],[47]	0.0
Fair Value, ending balance		0.0	[14],[32],[52]			0.0	[1],[27],[47]
Investment, Identifier [Axis]: Greystone Equity Member Corp, Diversified Financials
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	188.7
Fair Value, ending balance	[1],[11],[28]					188.7
Investment, Identifier [Axis]: Greystone Equity Member Corp, Financial Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[33]	187.2
Investment, Identifier [Axis]: HKA, Commercial & Professional Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	4.2
Fair Value, ending balance		4.3	[13],[14],[33],[42]			4.2	[1],[11],[28]
Investment, Identifier [Axis]: HKA, Commercial & Professional Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15],[28]	0.2
Fair Value, ending balance		0.2	[14],[19],[33]			0.2	[1],[15],[28]
Investment, Identifier [Axis]: HM Dunn Co Inc 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		35.6			33.6	33.6
Gross Additions		0.0	[2]			2.0	[3]
Gross Reductions		(0.3)	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0				0.0
Fair Value, ending balance		35.3				35.6
Investment Income		1.0	[6]			0.8	[7]
PIK Income		0.0	[6]			2.1	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: HM Dunn Co Inc 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			2.0	2.0
Gross Additions		0.0	[2]			0.0	[3]
Gross Reductions		0.0	[4]			(2.0)	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0				0.0
Fair Value, ending balance		0.0				0.0
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: HM Dunn Co Inc, Capital Goods 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[35]	35.6
Fair Value, ending balance		35.3	[13],[14],[34]			35.6	[1],[11],[35]
Investment, Identifier [Axis]: HM Dunn Co Inc, Capital Goods 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15],[35]	2.0
Fair Value, ending balance		2.0	[14],[19],[34]			2.0	[1],[15],[35]
Investment, Identifier [Axis]: HM Dunn Co Inc, Preferred Stock, Series A
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		16.9			7.1	7.1
Gross Additions		0.0	[2]			0.0	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		(0.3)				9.8
Fair Value, ending balance		16.6				16.9
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: HM Dunn Co Inc, Preferred Stock, Series A, Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[35],[36]	16.9
Fair Value, ending balance		16.6	[13],[14],[32],[34],[37]			16.9	[1],[11],[27],[35],[36]
Investment, Identifier [Axis]: HM Dunn Co Inc, Preferred Stock, Series B
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.0	0.0
Gross Additions		0.0	[2]			0.0	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0				0.0
Fair Value, ending balance		0.0				0.0
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: HM Dunn Co Inc, Preferred Stock, Series B, Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[35],[36]	0.0
Fair Value, ending balance		0.0	[13],[14],[32],[34],[37]			0.0	[1],[11],[27],[35],[36]
Investment, Identifier [Axis]: Harvey Industries Inc, Common Stock, Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[13],[32]	5.2
Fair Value, ending balance	[13],[32]	6.2	[14]			5.2	[1]
Investment, Identifier [Axis]: Heniff Transportation Systems LLC, Transportation 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[9],[10],[11],[12],[20],[41]	131.3
Fair Value, ending balance		3.4	[13],[14]			131.3	[1],[9],[10],[11],[12],[20],[41]
Investment, Identifier [Axis]: Heniff Transportation Systems LLC, Transportation 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	18.5
Fair Value, ending balance		132.7	[13],[14],[16],[17],[18],[22],[42]			18.5	[1],[11]
Investment, Identifier [Axis]: Heniff Transportation Systems LLC, Transportation 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	17.2
Fair Value, ending balance		18.7	[13],[14]			17.2	[1],[15]
Investment, Identifier [Axis]: Heniff Transportation Systems LLC, Transportation 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19]	14.1
Investment, Identifier [Axis]: Hibu Inc, Commercial & Professional Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[9],[10],[11],[20],[21],[41]	99.8
Fair Value, ending balance		99.3	[13],[14],[17],[18],[22],[23],[42]			99.8	[1],[9],[10],[11],[20],[21],[41]
Investment, Identifier [Axis]: Higginbotham Insurance Agency Inc, Insurance 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	4.4
Fair Value, ending balance		6.6	[13],[14]			4.4	[1],[11]
Investment, Identifier [Axis]: Higginbotham Insurance Agency Inc, Insurance 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	7.0
Fair Value, ending balance		6.9	[13],[14]			7.0	[1],[11]
Investment, Identifier [Axis]: Higginbotham Insurance Agency Inc, Insurance 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	6.0
Fair Value, ending balance		3.7	[14],[19]			6.0	[1],[15]
Investment, Identifier [Axis]: Hilding Anders 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			46.6	46.6
Gross Additions		0.0	[2]			0.0	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0				(46.6)
Fair Value, ending balance		0.0				0.0
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: Hilding Anders 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.0	0.0
Gross Additions		0.0	[2]			0.0	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0				0.0
Fair Value, ending balance		0.0				0.0
Investment Income		0.5	[6]			0.3	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: Hilding Anders 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.0	0.0
Gross Additions		0.0	[2]			0.0	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0				0.0
Fair Value, ending balance		0.0				0.0
Investment Income		0.1	[6]			0.1	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: Hilding Anders, Class A Common Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.0	0.0
Gross Additions		0.0	[2]			0.0	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0				0.0
Fair Value, ending balance		0.0				0.0
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: Hilding Anders, Class A Common Stock, Consumer Durables & Apparel
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[28],[35]	0.0
Fair Value, ending balance		0.0	[13],[14],[32],[33],[34]			0.0	[1],[11],[27],[28],[35]
Investment, Identifier [Axis]: Hilding Anders, Class B Common Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.0	0.0
Gross Additions		0.0	[2]			0.0	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0				0.0
Fair Value, ending balance		0.0				0.0
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: Hilding Anders, Class B Common Stock, Consumer Durables & Apparel
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[28],[35]	0.0
Fair Value, ending balance		0.0	[13],[14],[32],[33],[34]			0.0	[1],[11],[27],[28],[35]
Investment, Identifier [Axis]: Hilding Anders, Class C Common Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.0	0.0
Gross Additions		0.0	[2]			0.0	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0				0.0
Fair Value, ending balance		0.0				0.0
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: Hilding Anders, Class C Common Stock, Consumer Durables & Apparel
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[28],[35]	0.0
Fair Value, ending balance		0.0	[13],[14],[32],[33],[34]			0.0	[1],[11],[27],[28],[35]
Investment, Identifier [Axis]: Hilding Anders, Consumer Durables & Apparel 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance | €	[1],[11],[27],[28],[35]			€ 0.0
Fair Value, ending balance	[13],[32],[33],[34]	0.0
Investment, Identifier [Axis]: Hilding Anders, Consumer Durables & Apparel 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance | €	[1],[11],[24],[27],[28],[35]			€ 0.0
Fair Value, ending balance	[13],[29],[32],[33],[34]	0.0
Investment, Identifier [Axis]: Hilding Anders, Equity Options
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.0	0.0
Gross Additions		0.0	[2]			0.0	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0				0.0
Fair Value, ending balance		0.0				0.0
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: Hilding Anders, Equity Options, Consumer Durables & Apparel
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[28],[35]	0.0
Fair Value, ending balance		0.0	[13],[14],[32],[33],[34]			0.0	[1],[11],[27],[28],[35]
Investment, Identifier [Axis]: Home Partners JV 2, Private Equity 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.2
Gross Additions	[2]	0.0
Gross Reductions	[4]	0.0
Net Realized Gain (Loss)		0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0
Fair Value, ending balance		0.2				0.2
Investment Income	[6]	0.0
PIK Income	[6]	0.0
Fee income	[6]	0.0
Dividend and Other Income	[6]	0.0
Investment, Identifier [Axis]: Home Partners JV 2, Private Equity 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		5.0
Gross Additions	[2]	0.0
Gross Reductions	[4]	0.0
Net Realized Gain (Loss)		0.0
Net Change in Unrealized Appreciation (Depreciation)		(0.5)
Fair Value, ending balance		4.5				5.0
Investment Income	[6]	0.0
PIK Income	[6]	0.0
Fee income	[6]	0.0
Dividend and Other Income	[6]	0.0
Investment, Identifier [Axis]: Home Partners JV 2, Private Equity, Equity Real Estate Investment Trusts (REITs) 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[32],[33],[44]	4.5
Investment, Identifier [Axis]: Home Partners JV 2, Private Equity, Equity Real Estate Investment Trusts (REITs) 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[32],[33],[44]	0.2
Investment, Identifier [Axis]: Home Partners JV 2, Private Equity, Real Estate 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[28],[43]	5.0
Fair Value, ending balance	[1],[11],[27],[28],[43]					5.0
Investment, Identifier [Axis]: Home Partners JV 2, Private Equity, Real Estate 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[28],[43]	0.2
Fair Value, ending balance	[1],[11],[27],[28],[43]					0.2
Investment, Identifier [Axis]: Home Partners JV 2, Structured Mezzanine
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		10.2
Gross Additions	[2]	0.3
Gross Reductions	[4]	0.0
Net Realized Gain (Loss)		0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0
Fair Value, ending balance		10.5				10.2
Investment Income	[6]	0.0
PIK Income	[6]	0.3
Fee income	[6]	0.0
Dividend and Other Income	[6]	0.0
Investment, Identifier [Axis]: Home Partners JV 2, Structured Mezzanine, Asset Based Finance
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		10.2			3.5	3.5
Gross Additions	[3]					6.7
Gross Reductions	[5]					0.0
Net Realized Gain (Loss)						0.1
Net Change in Unrealized Appreciation (Depreciation)						(0.1)
Fair Value, ending balance						10.2
Investment Income	[7]					0.0
PIK Income	[7]					0.7
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Home Partners JV 2, Structured Mezzanine, Equity Real Estate Investment Trusts (REITs)
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[33],[44]	10.5
Investment, Identifier [Axis]: Home Partners JV 2, Structured Mezzanine, Real Estate
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28],[43]	10.2
Fair Value, ending balance	[1],[11],[28],[43]					10.2
Investment, Identifier [Axis]: Home Partners JV, Common Stock, Asset Based Finance -2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			80.6	80.6
Gross Additions	[3]					0.0
Gross Reductions	[5]					(101.0)
Net Realized Gain (Loss)						53.4
Net Change in Unrealized Appreciation (Depreciation)						(33.0)
Fair Value, ending balance						0.0
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					4.3
Investment, Identifier [Axis]: Imagine Communications Corp, Common Stock, Media & Entertainment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[13],[32]	2.0
Fair Value, ending balance	[13],[32]	2.0	[14]			2.0	[1]
Investment, Identifier [Axis]: Individual FoodService, Capital Goods 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[36],[41]	68.7
Fair Value, ending balance		103.4	[13],[14],[37]			68.7	[1],[36],[41]
Investment, Identifier [Axis]: Individual FoodService, Capital Goods 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	5.2
Fair Value, ending balance		4.7	[14],[19]			5.2	[1],[11]
Investment, Identifier [Axis]: Individual FoodService, Capital Goods 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[41]	16.6
Fair Value, ending balance		1.1	[14],[19]			16.6	[1],[11],[41]
Investment, Identifier [Axis]: Individual FoodService, Capital Goods 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	5.4
Fair Value, ending balance	[1],[11]					5.4
Investment, Identifier [Axis]: Individual FoodService, Capital Goods 5
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	6.8
Fair Value, ending balance	[1],[11]					6.8
Investment, Identifier [Axis]: Individual FoodService, Capital Goods 6
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	4.7
Fair Value, ending balance	[1],[15]					4.7
Investment, Identifier [Axis]: Individual FoodService, Capital Goods 7
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	1.4
Fair Value, ending balance	[1],[15]					1.4
Investment, Identifier [Axis]: Industria Chimica Emiliana Srl, Pharmaceuticals, Biotechnology & Life Sciences
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	91.3
Fair Value, ending balance		94.0	[13],[14],[33]			91.3	[1],[11],[28]
Investment, Identifier [Axis]: Industry City TI Lessor LP, Consumer Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[36]	26.0
Fair Value, ending balance		24.8	[13],[14],[37]			26.0	[1],[11],[36]
Investment, Identifier [Axis]: Insight Global LLC, Commercial & Professional Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	8.2
Fair Value, ending balance		197.7	[13],[14],[16]			8.2	[1],[11]
Investment, Identifier [Axis]: Insight Global LLC, Commercial & Professional Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[12]	197.0
Fair Value, ending balance		20.5	[14],[19]			197.0	[1],[11],[12]
Investment, Identifier [Axis]: Insight Global LLC, Commercial & Professional Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	12.2
Fair Value, ending balance		26.2	[14],[19]			12.2	[1],[15]
Investment, Identifier [Axis]: Insight Global LLC, Commercial & Professional Services 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	26.0
Fair Value, ending balance	[1],[15]					26.0
Investment, Identifier [Axis]: Integrity Marketing Group LLC, Insurance
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	122.4
Fair Value, ending balance		122.5	[13],[14]			122.4	[1],[11]
Investment, Identifier [Axis]: J S Held LLC, Insurance 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[12],[20],[36],[41]	101.8
Fair Value, ending balance		122.8	[13],[14],[16],[22],[37]			101.8	[1],[11],[12],[20],[36],[41]
Investment, Identifier [Axis]: J S Held LLC, Insurance 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	8.8
Fair Value, ending balance		12.6	[13],[14]			8.8	[1],[11]
Investment, Identifier [Axis]: J S Held LLC, Insurance 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	22.0
Fair Value, ending balance		26.2	[13],[14],[22]			22.0	[1],[11]
Investment, Identifier [Axis]: J S Held LLC, Insurance 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[20]	24.6
Fair Value, ending balance		1.2	[14],[19]			24.6	[1],[11],[20]
Investment, Identifier [Axis]: J S Held LLC, Insurance 5
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	5.2
Fair Value, ending balance		17.1	[14],[19]			5.2	[1],[15]
Investment, Identifier [Axis]: J S Held LLC, Insurance 6
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	19.0
Fair Value, ending balance	[1],[15]					19.0
Investment, Identifier [Axis]: JW Aluminum Co
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		78.1			81.0	81.0
Gross Additions		0.1	[2]			0.2	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		(1.2)				(3.1)
Fair Value, ending balance		77.0				78.1
Investment Income		2.0	[6]			8.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: JW Aluminum Co, Common Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		2.4			0.0	0.0
Gross Additions		0.0	[2]			0.0	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0				2.4
Fair Value, ending balance		2.4				2.4
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: JW Aluminum Co, Common Stock, Materials
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[35],[56]	2.4
Fair Value, ending balance		2.4	[13],[14],[32],[34],[54],[55]			2.4	[1],[11],[27],[35],[56]
Investment, Identifier [Axis]: JW Aluminum Co, Materials
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[35],[36],[39]	78.1
Fair Value, ending balance		77.0	[13],[14],[34],[37],[40]			78.1	[1],[11],[35],[36],[39]
Investment, Identifier [Axis]: JW Aluminum Co, Preferred Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		112.5			122.6	122.6
Gross Additions		4.5	[2]			22.2	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		30.9				(32.3)
Fair Value, ending balance		147.9				112.5
Investment Income		0.1	[6]			0.6	[7]
PIK Income		4.5	[6]			19.7	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: JW Aluminum Co, Preferred Stock, Materials
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[35]	112.5
Fair Value, ending balance		147.9	[13],[14],[34],[54],[55]			112.5	[1],[11],[27],[35]
Investment, Identifier [Axis]: Jarrow Formulas Inc, Household & Personal Products
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[9],[10],[11],[12],[20],[21],[36],[41]	181.3
Fair Value, ending balance		177.9	[13],[14],[16],[17],[18],[22],[23],[37],[42]			181.3	[1],[9],[10],[11],[12],[20],[21],[36],[41]
Investment, Identifier [Axis]: Jet Edge International LLC, Term Loan , Asset Based Finance
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			75.6	75.6
Gross Additions	[3]					0.0
Gross Reductions	[5]					(75.9)
Net Realized Gain (Loss)						0.0
Net Change in Unrealized Appreciation (Depreciation)						0.3
Fair Value, ending balance						0.0
Investment Income	[7]					11.6
PIK Income	[7]					2.3
Fee income	[7]					3.3
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Jet Edge International LLC, Term Loan, Transportation 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	76.7
Fair Value, ending balance		74.2	[13],[14]			76.7	[1],[11]
Investment, Identifier [Axis]: Jet Edge International LLC, Term Loan, Transportation 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	0.7
Fair Value, ending balance		0.7	[14],[19]			0.7	[1],[15]
Investment, Identifier [Axis]: Jet Edge International LLC, Warrant, Asset Based Finance
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			4.5	4.5
Gross Additions	[3]					0.0
Gross Reductions	[5]					(13.5)
Net Realized Gain (Loss)						13.5
Net Change in Unrealized Appreciation (Depreciation)						(4.5)
Fair Value, ending balance						0.0
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					1.5
Investment, Identifier [Axis]: Jones Apparel Holdings, Inc., Common Stock, Consumer Durables & Apparel
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[13],[32]	0.0
Fair Value, ending balance	[13],[32]	0.0	[14]			0.0	[1]
Investment, Identifier [Axis]: KKR Altitude II Offshore Aggregator LP, Partnership Interest
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		44.4			0.0	0.0
Gross Additions		4.6	[2]			44.4	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		0.8
Fair Value, ending balance		49.8				44.4
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: KKR Altitude II Offshore Aggregator LP, Partnership Interest, Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[28],[35]	44.4
Fair Value, ending balance		49.8	[13],[14],[32],[33],[34]			44.4	[1],[11],[27],[28],[35]
Investment, Identifier [Axis]: KKR Central Park Leasing Aggregator L.P., Partnership Interest, Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[24],[27],[28]	16.3
Fair Value, ending balance		16.2	[13],[14],[29],[32],[33]			16.3	[1],[11],[24],[27],[28]
Investment, Identifier [Axis]: KKR Chord IP Aggregator LP, Partnership Interest, Media & Entertainment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	96.3
Fair Value, ending balance		98.7	[13],[14],[33]			96.3	[1],[11],[28]
Investment, Identifier [Axis]: KKR Residential Opportunities I LLC, Private Equity, Real Estate
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27]	17.6
Fair Value, ending balance	[1],[11],[27]					17.6
Investment, Identifier [Axis]: KKR Residential Opportunities I LLC, Private Equity, Real Estate Management & Development
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[32]	20.4
Investment, Identifier [Axis]: KKR Rocket Loans Aggregator LLC, Partnership Interest
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		4.3			1.4	1.4
Gross Additions		9.9	[2]			2.9	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		(0.3)				0.0
Fair Value, ending balance		13.9				4.3
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.3	[6]			1.3	[7]
Investment, Identifier [Axis]: KKR Rocket Loans Aggregator LLC, Partnership Interest, Diversified Financials
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28],[35]	4.3
Fair Value, ending balance	[1],[11],[28],[35]					4.3
Investment, Identifier [Axis]: KKR Rocket Loans Aggregator LLC, Partnership Interest, Financial Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[33],[34]	13.9
Investment, Identifier [Axis]: KKR Zeno Aggregator LP (K2 Aviation), Partnership Interest, Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[28]	20.0
Fair Value, ending balance		20.6	[13],[14],[32],[33]			20.0	[1],[11],[27],[28]
Investment, Identifier [Axis]: Karman Space Inc, Capital Goods 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[41]	49.7
Fair Value, ending balance		86.1	[13],[14]			49.7	[1],[11],[41]
Investment, Identifier [Axis]: Karman Space Inc, Capital Goods 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	4.4
Fair Value, ending balance		4.6	[13],[14]			4.4	[1],[11]
Investment, Identifier [Axis]: Karman Space Inc, Capital Goods 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	36.1
Fair Value, ending balance		0.8	[14],[19]			36.1	[1],[11]
Investment, Identifier [Axis]: Karman Space Inc, Capital Goods 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	0.9
Fair Value, ending balance	[1],[15]					0.9
Investment, Identifier [Axis]: Kellermeyer Bergensons Services LLC, Commercial & Professional Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[16],[17],[18],[22],[23],[37],[42]	339.2
Investment, Identifier [Axis]: Kellermeyer Bergensons Services LLC, Commercial & Professional Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[9],[10],[11],[12],[20],[21],[36],[41]	244.6
Fair Value, ending balance	[1],[9],[10],[11],[12],[20],[21],[36],[41]					244.6
Investment, Identifier [Axis]: Kellermeyer Bergensons Services LLC, Commercial & Professional Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	77.0
Fair Value, ending balance	[1],[11]					77.0
Investment, Identifier [Axis]: Kellermeyer Bergensons Services LLC, Commercial & Professional Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	14.0
Fair Value, ending balance	[1],[11]					14.0
Investment, Identifier [Axis]: Kilter Finance, Preferred Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		99.5			36.1	36.1
Gross Additions		0.0	[2]			87.3	[3]
Gross Reductions		0.0	[4]			(24.0)	[5]
Net Realized Gain (Loss)		0.0				0.7
Net Change in Unrealized Appreciation (Depreciation)		(0.1)				(0.6)
Fair Value, ending balance		99.4				99.5
Investment Income		3.7	[6]			7.4	[7]
PIK Income		0.0	[6]			1.9	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: Kilter Finance, Preferred Stock, Insurance
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28],[35]	99.5
Fair Value, ending balance		99.4	[13],[14],[33],[34]			99.5	[1],[11],[28],[35]
Investment, Identifier [Axis]: Kilter Finance, Private Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.5			0.5	0.5
Gross Additions		0.0	[2]			0.0	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0				0.0
Fair Value, ending balance		0.5				0.5
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: Kilter Finance, Private Equity, Insurance
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[28],[35]	0.5
Fair Value, ending balance		0.5	[13],[14],[32],[33],[34]			0.5	[1],[11],[27],[28],[35]
Investment, Identifier [Axis]: Laboratoires Vivacy SAS, Pharmaceuticals, Biotechnology & Life Sciences 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[33]	8.1
Investment, Identifier [Axis]: Laboratoires Vivacy SAS, Pharmaceuticals, Biotechnology & Life Sciences 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19],[33]	0.6
Investment, Identifier [Axis]: Lakefield Veterinary Group, Health Care Equipment & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[12],[20]	103.8
Fair Value, ending balance		104.6	[13],[14],[16],[22],[42]			103.8	[1],[11],[12],[20]
Investment, Identifier [Axis]: Lakefield Veterinary Group, Health Care Equipment & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	33.7
Fair Value, ending balance		33.0	[14],[19]			33.7	[1],[15]
Investment, Identifier [Axis]: Lakeview Farms Inc, Food, Beverage & Tobacco 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[41]	30.2
Fair Value, ending balance		73.8	[13],[14],[18],[42]			30.2	[1],[10],[41]
Investment, Identifier [Axis]: Lakeview Farms Inc, Food, Beverage & Tobacco 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	4.3
Fair Value, ending balance		3.8	[13],[14]			4.3	[1],[11]
Investment, Identifier [Axis]: Lakeview Farms Inc, Food, Beverage & Tobacco 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[41]	43.6
Fair Value, ending balance		10.5	[14],[19]			43.6	[1],[11],[41]
Investment, Identifier [Axis]: Lakeview Farms Inc, Food, Beverage & Tobacco 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	10.5
Fair Value, ending balance		2.8	[14],[19]			10.5	[1],[15]
Investment, Identifier [Axis]: Lakeview Farms Inc, Food, Beverage & Tobacco 5
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	2.2
Fair Value, ending balance	[1],[15]					2.2
Investment, Identifier [Axis]: Lexitas Inc, Commercial & Professional Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[9],[10],[11],[12],[41]	131.1
Fair Value, ending balance		0.8	[13],[14]			131.1	[1],[9],[10],[11],[12],[41]
Investment, Identifier [Axis]: Lexitas Inc, Commercial & Professional Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	8.3
Fair Value, ending balance		131.8	[13],[14],[16],[17],[18],[42]			8.3	[1],[15]
Investment, Identifier [Axis]: Lexitas Inc, Commercial & Professional Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19]	7.5
Investment, Identifier [Axis]: Lionbridge Technologies Inc, Media & Entertainment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[9],[11],[20],[21],[36],[41]	123.4
Fair Value, ending balance		120.2	[13],[14],[17],[22],[23],[37]			123.4	[1],[9],[11],[20],[21],[36],[41]
Investment, Identifier [Axis]: Lipari Foods LLC, Common Stock, Consumer Staples Distribution & Retail
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[32]	8.2
Investment, Identifier [Axis]: Lipari Foods LLC, Common Stock, Food & Staples Retailing
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[13],[32]	8.0
Fair Value, ending balance	[1],[13],[32]					8.0
Investment, Identifier [Axis]: Lipari Foods LLC, Consumer Staples Distribution & Retail 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[16],[22],[42]	97.3
Investment, Identifier [Axis]: Lipari Foods LLC, Consumer Staples Distribution & Retail 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19]	26.0
Investment, Identifier [Axis]: Lipari Foods LLC, Food & Staples Retailing 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[12],[20]	94.9
Fair Value, ending balance	[1],[11],[12],[20]					94.9
Investment, Identifier [Axis]: Lipari Foods LLC, Food & Staples Retailing 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	27.0
Fair Value, ending balance	[1],[15]					27.0
Investment, Identifier [Axis]: Lloyd's Register Quality Assurance Ltd, Consumer Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	6.7
Fair Value, ending balance		6.9	[13],[14],[33]			6.7	[1],[11],[28]
Investment, Identifier [Axis]: Lloyd's Register Quality Assurance Ltd, Consumer Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15],[28]	12.3
Fair Value, ending balance		12.4	[14],[19],[33]			12.3	[1],[15],[28]
Investment, Identifier [Axis]: Luxembourg Life Fund - Absolute Return Fund II, Structured Mezzanine, Insurance
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	24.6
Fair Value, ending balance	[1],[11],[28]					24.6
Investment, Identifier [Axis]: MB Precision Holdings LLC, Class A - 2 Units, Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[27],[51],[57]	0.0
Fair Value, ending balance	[1],[27],[51],[57]					0.0
Investment, Identifier [Axis]: MB2 Dental Solutions LLC, Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[9],[10],[11],[21],[41]	263.6
Fair Value, ending balance	[1],[9],[10],[11],[21],[41]					263.6
Investment, Identifier [Axis]: MB2 Dental Solutions LLC, Health Care Equipment & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14]	54.8
Investment, Identifier [Axis]: MB2 Dental Solutions LLC, Health Care Equipment & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[17],[18],[23],[42]	137.2
Investment, Identifier [Axis]: MB2 Dental Solutions LLC, Health Care Equipment & Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14]	70.7
Investment, Identifier [Axis]: Magna Legal Services LLC, Commercial & Professional Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	18.2
Fair Value, ending balance		22.9	[13],[14],[42]			18.2	[1],[11]
Investment, Identifier [Axis]: Magna Legal Services LLC, Commercial & Professional Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	2.1
Fair Value, ending balance		2.1	[14],[19]			2.1	[1],[15]
Investment, Identifier [Axis]: Magna Legal Services LLC, Commercial & Professional Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	5.1
Fair Value, ending balance		0.6	[14],[19]			5.1	[1],[15]
Investment, Identifier [Axis]: Magna Legal Services LLC, Common Stock, Commercial & Professional Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[27],[47]	4.9
Fair Value, ending balance		5.2	[14],[32],[48]			4.9	[1],[27],[47]
Investment, Identifier [Axis]: Matchesfashion Ltd, Consumer Durables & Apparel
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[24],[27],[28]	4.8
Fair Value, ending balance		2.8	[13],[14],[29],[32],[33]			4.8	[1],[11],[24],[27],[28]
Investment, Identifier [Axis]: Maverick Natural Resources LLC, Common Stock, Energy
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[52],[58]	160.9
Fair Value, ending balance	[52],[58]	143.6	[14]			160.9	[1]
Investment, Identifier [Axis]: Med-Metrix, Common Stock, Software & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[27],[47]	2.9
Fair Value, ending balance		3.3	[14],[32],[48]			2.9	[1],[27],[47]
Investment, Identifier [Axis]: Med-Metrix, Preferred Stock, Software & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[47]	1.5
Fair Value, ending balance		1.5	[14],[48]			1.5	[1],[47]
Investment, Identifier [Axis]: Med-Metrix, Software & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[12],[21]	56.6
Fair Value, ending balance		56.5	[13],[14],[16],[23],[42]			56.6	[1],[11],[12],[21]
Investment, Identifier [Axis]: Med-Metrix, Software & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	25.3
Fair Value, ending balance		25.3	[14],[19]			25.3	[1],[15]
Investment, Identifier [Axis]: Med-Metrix, Software & Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	7.8
Fair Value, ending balance		7.8	[14],[19]			7.8	[1],[15]
Investment, Identifier [Axis]: Medallia Inc, Software & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	203.0
Fair Value, ending balance		204.8	[13],[14],[42]			203.0	[1],[11]
Investment, Identifier [Axis]: Miami Beach Medical Group LLC, Common Stock, Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[13],[32]	0.0
Fair Value, ending balance	[1],[13],[32]					0.0
Investment, Identifier [Axis]: Miami Beach Medical Group LLC, Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[41]	139.8
Fair Value, ending balance	[1],[11],[41]					139.8
Investment, Identifier [Axis]: Miami Beach Medical Group LLC, Health Care Equipment & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[42]	116.2
Investment, Identifier [Axis]: Miami Beach Medical Group LLC, Health Care Equipment & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[32]	2.7
Investment, Identifier [Axis]: Micronics Filtration Holdings Inc, Common Stock, Equity/Other
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.0	0.0
Gross Additions	[3]					0.0
Gross Reductions	[5]					(0.1)
Net Realized Gain (Loss)						(0.5)
Net Change in Unrealized Appreciation (Depreciation)						0.6
Fair Value, ending balance						0.0
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Micronics Filtration Holdings Inc, Senior Secured Loans—First Lien
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			51.0	51.0
Gross Additions	[3]					5.7
Gross Reductions	[5]					(51.7)
Net Realized Gain (Loss)						0.0
Net Change in Unrealized Appreciation (Depreciation)						(5.0)
Fair Value, ending balance						0.0
Investment Income	[7]					0.2
PIK Income	[7]					0.3
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Misys Ltd, Preferred Stock, Software & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	61.1
Fair Value, ending balance		64.5	[13],[14],[33]			61.1	[1],[11],[28]
Investment, Identifier [Axis]: Misys Ltd, Software & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28],[39]	12.3
Fair Value, ending balance		13.3	[13],[14],[33],[40]			12.3	[1],[11],[28],[39]
Investment, Identifier [Axis]: Monitronics International Inc, Commercial & Professional Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[20],[39]	12.5
Fair Value, ending balance		7.7	[13],[14],[22],[29],[32],[40]			12.5	[1],[11],[20],[39]
Investment, Identifier [Axis]: Monitronics International Inc, Commercial & Professional Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	42.3
Fair Value, ending balance		50.5	[13],[14]			42.3	[1],[11]
Investment, Identifier [Axis]: Monitronics International Inc, Commercial & Professional Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	21.9
Fair Value, ending balance		14.6	[14],[19]			21.9	[1],[15]
Investment, Identifier [Axis]: Motion Recruitment Partners LLC, Commercial & Professional Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[12],[20]	63.6
Fair Value, ending balance		63.7	[13],[14],[16],[22]			63.6	[1],[11],[12],[20]
Investment, Identifier [Axis]: Motion Recruitment Partners LLC, Commercial & Professional Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[21],[41]	59.0
Fair Value, ending balance		54.4	[13],[14],[23]			59.0	[1],[11],[21],[41]
Investment, Identifier [Axis]: Motion Recruitment Partners LLC, Commercial & Professional Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	59.2
Fair Value, ending balance		4.7	[13],[14]			59.2	[1],[15]
Investment, Identifier [Axis]: Motion Recruitment Partners LLC, Commercial & Professional Services 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19]	59.5
Investment, Identifier [Axis]: My Community Homes PropCo 2, Private Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		79.0
Gross Additions	[2]	0.0
Gross Reductions	[4]	(2.5)
Net Realized Gain (Loss)		0.0
Net Change in Unrealized Appreciation (Depreciation)		4.0
Fair Value, ending balance		80.5				79.0
Investment Income	[6]	0.0
PIK Income	[6]	0.0
Fee income	[6]	0.0
Dividend and Other Income	[6]	0.0
Investment, Identifier [Axis]: My Community Homes PropCo 2, Private Equity, Equity Real Estate Investment Trusts (REITs)
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[32],[33],[34]	80.5
Investment, Identifier [Axis]: My Community Homes PropCo 2, Private Equity, Real Estate
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[13],[32],[33],[34]	79.0
Fair Value, ending balance	[1],[13],[32],[33],[34]					79.0
Investment, Identifier [Axis]: My Community Homes SFR PropCo 2, Private Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		79.0			33.0	33.0
Gross Additions	[3]					157.0
Gross Reductions	[5]					(105.7)
Net Realized Gain (Loss)						0.0
Net Change in Unrealized Appreciation (Depreciation)						(5.3)
Fair Value, ending balance						79.0
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: NBG Home, Common Stock, Consumer Durables & Apparel
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[13],[32]	0.0
Fair Value, ending balance	[13],[32]	0.0	[14]			0.0	[1]
Investment, Identifier [Axis]: NBG Home, Consumer Durables & Apparel 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[24],[27]	21.2
Fair Value, ending balance		26.1	[13],[14]			21.2	[1],[11],[24],[27]
Investment, Identifier [Axis]: NBG Home, Consumer Durables & Apparel 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[24],[27]	0.0
Fair Value, ending balance		23.4	[13],[14],[29],[32]			0.0	[1],[11],[24],[27]
Investment, Identifier [Axis]: NBG Home, Consumer Durables & Apparel 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19]	1.0
Investment, Identifier [Axis]: NBG Home, Consumer Durables & Apparel 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[29],[32]	0.0
Investment, Identifier [Axis]: NCI Inc
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		28.1			0.0	0.0
Gross Additions		0.8	[2]			79.1	[3]
Gross Reductions		0.0	[4]			(21.9)	[5]
Net Realized Gain (Loss)		0.0				(28.5)
Net Change in Unrealized Appreciation (Depreciation)		0.3				(0.6)
Fair Value, ending balance		29.2				28.1
Investment Income		(0.3)	[6]			6.5	[7]
PIK Income		0.9	[6]			0.4	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: NCI Inc, Class A-1 Common Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[8]	0.0			0.0	0.0
Gross Additions		0.0	[2]			0.0	[3],[8]
Gross Reductions		0.0	[4]			0.0	[5],[8]
Net Realized Gain (Loss)		0.0				0.0	[8]
Net Change in Unrealized Appreciation (Depreciation)		0.0				0.0	[8]
Fair Value, ending balance		0.0				0.0	[8]
Investment Income		0.0	[6]			0.0	[7],[8]
PIK Income		0.0	[6]			0.0	[7],[8]
Fee income		0.0	[6]			0.0	[7],[8]
Dividend and Other Income		0.0	[6]			0.0	[7],[8]
Investment, Identifier [Axis]: NCI Inc, Class A-1 Common Stock, Software & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[35]	0.0
Fair Value, ending balance		0.0	[13],[14],[32],[34]			0.0	[1],[11],[27],[35]
Investment, Identifier [Axis]: NCI Inc, Class B-1 Common Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[8]	0.0			0.0	0.0
Gross Additions		0.0	[2]			0.0	[3],[8]
Gross Reductions		0.0	[4]			0.0	[5],[8]
Net Realized Gain (Loss)		0.0				0.0	[8]
Net Change in Unrealized Appreciation (Depreciation)		0.0				0.0	[8]
Fair Value, ending balance		0.0				0.0	[8]
Investment Income		0.0	[6]			0.0	[7],[8]
PIK Income		0.0	[6]			0.0	[7],[8]
Fee income		0.0	[6]			0.0	[7],[8]
Dividend and Other Income		0.0	[6]			0.0	[7],[8]
Investment, Identifier [Axis]: NCI Inc, Class B-1 Common Stock, Software & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[35]	0.0
Fair Value, ending balance		0.0	[13],[14],[32],[34]			0.0	[1],[11],[27],[35]
Investment, Identifier [Axis]: NCI Inc, Class C Common Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[8]	20.2			0.0	0.0
Gross Additions		0.0	[2]			20.2	[3],[8]
Gross Reductions		0.0	[4]			0.0	[5],[8]
Net Realized Gain (Loss)		0.0				0.0	[8]
Net Change in Unrealized Appreciation (Depreciation)		(1.1)				0.0	[8]
Fair Value, ending balance		19.1				20.2	[8]
Investment Income		0.0	[6]			0.0	[7],[8]
PIK Income		0.0	[6]			0.0	[7],[8]
Fee income		0.0	[6]			0.0	[7],[8]
Dividend and Other Income		0.0	[6]			0.0	[7],[8]
Investment, Identifier [Axis]: NCI Inc, Class C Common Stock, Software & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[35]	20.2
Fair Value, ending balance		19.1	[13],[14],[32],[34]			20.2	[1],[11],[27],[35]
Investment, Identifier [Axis]: NCI Inc, Class I-1 Common Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[8]	0.0			0.0	0.0
Gross Additions		0.0	[2]			0.0	[3],[8]
Gross Reductions		0.0	[4]			0.0	[5],[8]
Net Realized Gain (Loss)		0.0				0.0	[8]
Net Change in Unrealized Appreciation (Depreciation)		0.0				0.0	[8]
Fair Value, ending balance		0.0				0.0	[8]
Investment Income		0.0	[6]			0.0	[7],[8]
PIK Income		0.0	[6]			0.0	[7],[8]
Fee income		0.0	[6]			0.0	[7],[8]
Dividend and Other Income		0.0	[6]			0.0	[7],[8]
Investment, Identifier [Axis]: NCI Inc, Class I-1 Common Stock, Software & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[35]	0.0
Fair Value, ending balance		0.0	[13],[14],[32],[34]			0.0	[1],[11],[27],[35]
Investment, Identifier [Axis]: NCI Inc, Software & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[35]	28.1
Fair Value, ending balance		29.2	[13],[14],[34]			28.1	[1],[11],[35]
Investment, Identifier [Axis]: NPD Group Inc/The, Consumer Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	0.1
Fair Value, ending balance	[1],[11]					0.1
Investment, Identifier [Axis]: NPD Group Inc/The, Consumer Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	19.2
Fair Value, ending balance	[1],[11]					19.2
Investment, Identifier [Axis]: NPD Group Inc/The, Consumer Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	0.9
Fair Value, ending balance	[1],[15]					0.9
Investment, Identifier [Axis]: Net Documents, Software & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	32.0
Fair Value, ending balance		32.0	[13],[14]			32.0	[1],[11]
Investment, Identifier [Axis]: Net Documents, Software & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	2.9
Fair Value, ending balance		0.3	[13],[14]			2.9	[1],[15]
Investment, Identifier [Axis]: Net Documents, Software & Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19]	2.6
Investment, Identifier [Axis]: New Era Technology Inc, Software & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[12],[21],[41]	50.2
Fair Value, ending balance		33.7	[13],[14],[16],[18],[23]			50.2	[1],[10],[12],[21],[41]
Investment, Identifier [Axis]: New Era Technology Inc, Software & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	2.5
Fair Value, ending balance		3.5	[13],[14]			2.5	[1],[11]
Investment, Identifier [Axis]: New Era Technology Inc, Software & Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	2.1
Fair Value, ending balance		16.5	[14],[16],[23]			2.1	[1],[15]
Investment, Identifier [Axis]: New Era Technology Inc, Software & Services 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19]	1.2
Investment, Identifier [Axis]: NewStar Clarendon 2014-1A Class D, Diversified Financials
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	3.5
Fair Value, ending balance	[1],[11],[28]					3.5
Investment, Identifier [Axis]: NewStar Clarendon 2014-1A Class D, Financial Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[33]	3.7
Investment, Identifier [Axis]: Nine West Holdings Inc, Common Stock, Consumer Durables & Apparel
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[13],[32]	0.0
Fair Value, ending balance	[13],[32]	0.0	[34]			0.0	[1]
Investment, Identifier [Axis]: Novotech Pty Ltd, Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15],[28]	5.5
Fair Value, ending balance		5.5	[14],[19],[33]			5.5	[1],[15],[28]
Investment, Identifier [Axis]: OEConnection LLC, Software & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[20]	73.6
Fair Value, ending balance		73.5	[13],[14],[22]			73.6	[1],[11],[20]
Investment, Identifier [Axis]: Omnimax International Inc, Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[9],[10],[11],[12],[20],[41]	175.0
Fair Value, ending balance		165.1	[13],[14],[16],[17],[18],[22],[42]			175.0	[1],[9],[10],[11],[12],[20],[41]
Investment, Identifier [Axis]: One Call Care Management Inc 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[59]	0.0			5.0	5.0
Gross Additions	[3],[59]					0.0
Gross Reductions	[5],[59]					(4.7)
Net Realized Gain (Loss)	[59]					0.0
Net Change in Unrealized Appreciation (Depreciation)	[59]					(0.3)
Fair Value, ending balance	[59]					0.0
Investment Income	[7],[59]					0.0
PIK Income	[7],[59]					0.0
Fee income	[7],[59]					0.0
Dividend and Other Income	[7],[59]					0.0
Investment, Identifier [Axis]: One Call Care Management Inc 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[59]	0.0			23.5	23.5
Gross Additions	[3],[59]					0.0
Gross Reductions	[5],[59]					(21.6)
Net Realized Gain (Loss)	[59]					0.0
Net Change in Unrealized Appreciation (Depreciation)	[59]					(1.9)
Fair Value, ending balance	[59]					0.0
Investment Income	[7],[59]					0.0
PIK Income	[7],[59]					0.0
Fee income	[7],[59]					0.0
Dividend and Other Income	[7],[59]					0.0
Investment, Identifier [Axis]: One Call Care Management Inc, Common Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[59]	0.0			2.4	2.4
Gross Additions	[3],[59]					0.0
Gross Reductions	[5],[59]					(2.1)
Net Realized Gain (Loss)	[59]					0.0
Net Change in Unrealized Appreciation (Depreciation)	[59]					(0.3)
Fair Value, ending balance	[59]					0.0
Investment Income	[7],[59]					0.0
PIK Income	[7],[59]					0.0
Fee income	[7],[59]					0.0
Dividend and Other Income	[7],[59]					0.0
Investment, Identifier [Axis]: One Call Care Management Inc, Common Stock, Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[13],[32]	1.9
Fair Value, ending balance	[13],[32]	1.3				1.9	[1]
Investment, Identifier [Axis]: One Call Care Management Inc, Health Care Equipment & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[39]	4.1
Fair Value, ending balance		3.7	[13],[14],[40]			4.1	[1],[11],[39]
Investment, Identifier [Axis]: One Call Care Management Inc, Health Care Equipment & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	20.9
Fair Value, ending balance		18.8	[13]			20.9	[1],[11]
Investment, Identifier [Axis]: One Call Care Management Inc, Preferred Stock A
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[59]	0.0			26.1	26.1
Gross Additions	[3],[59]					0.0
Gross Reductions	[5],[59]					(22.8)
Net Realized Gain (Loss)	[59]					0.0
Net Change in Unrealized Appreciation (Depreciation)	[59]					(3.3)
Fair Value, ending balance	[59]					0.0
Investment Income	[7],[59]					0.0
PIK Income	[7],[59]					0.0
Fee income	[7],[59]					0.0
Dividend and Other Income	[7],[59]					0.0
Investment, Identifier [Axis]: One Call Care Management Inc, Preferred Stock A, Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[13],[32]	20.5
Fair Value, ending balance	[13],[32]	17.7				20.5	[1]
Investment, Identifier [Axis]: One Call Care Management Inc, Preferred Stock B 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[59]	0.0			9.2	9.2
Gross Additions	[3],[59]					0.0
Gross Reductions	[5],[59]					(8.0)
Net Realized Gain (Loss)	[59]					0.0
Net Change in Unrealized Appreciation (Depreciation)	[59]					(1.2)
Fair Value, ending balance	[59]					0.0
Investment Income	[7],[59]					0.0
PIK Income	[7],[59]					0.0
Fee income	[7],[59]					0.0
Dividend and Other Income	[7],[59]					0.0
Investment, Identifier [Axis]: One Call Care Management Inc, Preferred Stock B, Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[27]	7.7
Fair Value, ending balance		7.7	[13]			7.7	[1],[27]
Investment, Identifier [Axis]: Opendoor Labs Inc, Structured Mezzanine, Real Estate
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	66.4
Fair Value, ending balance	[1],[11],[28]					66.4
Investment, Identifier [Axis]: Opendoor Labs Inc, Structured Mezzanine, Real Estate Management & Development
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[33]	54.1
Investment, Identifier [Axis]: Orchard Marine Limited, Class B Common Stock, Asset Based Finance
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.0	0.0
Gross Additions	[3]					0.0
Gross Reductions	[5]					0.0
Net Realized Gain (Loss)						(3.1)
Net Change in Unrealized Appreciation (Depreciation)						3.1
Fair Value, ending balance						0.0
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Orchard Marine Limited, Series A Preferred Stock, Asset Based Finance
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			64.6	64.6
Gross Additions	[3]					0.1
Gross Reductions	[5]					(66.0)
Net Realized Gain (Loss)						3.9
Net Change in Unrealized Appreciation (Depreciation)						(2.6)
Fair Value, ending balance						0.0
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Oxford Global Resources LLC, Commercial & Professional Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[9],[10],[11],[20],[21],[41]	94.1
Fair Value, ending balance		87.7	[13],[14],[17],[18],[22],[23],[42]			94.1	[1],[9],[10],[11],[20],[21],[41]
Investment, Identifier [Axis]: Oxford Global Resources LLC, Commercial & Professional Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	3.5
Fair Value, ending balance		3.1	[13],[14]			3.5	[1],[11]
Investment, Identifier [Axis]: Oxford Global Resources LLC, Commercial & Professional Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	8.3
Fair Value, ending balance		7.3	[13],[14]			8.3	[1],[15]
Investment, Identifier [Axis]: Oxford Global Resources LLC, Commercial & Professional Services 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	4.1
Fair Value, ending balance		4.6	[14],[19]			4.1	[1],[15]
Investment, Identifier [Axis]: Oxford Global Resources LLC, Commercial & Professional Services 5
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19]	8.0
Investment, Identifier [Axis]: PRG III LLC, Preferred Stock, Series A PIK
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		105.7			17.4	17.4
Gross Additions		0.0	[2]			0.0	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		33.8				88.3
Fair Value, ending balance		139.5				105.7
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: PRG III LLC, Preferred Stock, Series A PIK, Media & Entertainment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[35]	105.7
Fair Value, ending balance		139.5	[13],[32],[34]			105.7	[1],[11],[27],[35]
Investment, Identifier [Axis]: PRG III LLC, Preferred Stock, Series B PIK
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.0	0.0
Gross Additions		0.0	[2]			0.0	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0				0.0
Fair Value, ending balance		0.0				0.0
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: PRG III LLC, Preferred Stock, Series B PIK, Media & Entertainment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[35]	0.0
Fair Value, ending balance		0.0	[13],[32],[34]			0.0	[1],[11],[27],[35]
Investment, Identifier [Axis]: PSKW LLC (dba ConnectiveRx), Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[12],[21],[36]	291.8
Fair Value, ending balance		291.0	[13],[14],[16],[18],[23],[37],[42]			291.8	[1],[10],[11],[12],[21],[36]
Investment, Identifier [Axis]: Parts Town LLC, Consumer Discretionary Distribution & Retail
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[23],[42]	97.1
Investment, Identifier [Axis]: Parts Town LLC, Retailing 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[21]	35.9
Fair Value, ending balance	[1],[11],[21]					35.9
Investment, Identifier [Axis]: Parts Town LLC, Retailing 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	61.1
Fair Value, ending balance	[1],[11]					61.1
Investment, Identifier [Axis]: PartsSource Inc, Health Care Equipment & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	62.9
Fair Value, ending balance		0.9	[13],[14]			62.9	[1],[11]
Investment, Identifier [Axis]: PartsSource Inc, Health Care Equipment & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	4.1
Fair Value, ending balance		63.2	[13],[14]			4.1	[1],[15]
Investment, Identifier [Axis]: PartsSource Inc, Health Care Equipment & Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	22.1
Fair Value, ending balance		3.2	[14],[19]			22.1	[1],[15]
Investment, Identifier [Axis]: PartsSource Inc, Health Care Equipment & Services 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19]	22.3
Investment, Identifier [Axis]: Peraton Corp, Capital Goods 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[36]	174.7
Fair Value, ending balance		176.8	[13],[14],[37]			174.7	[1],[11],[36]
Investment, Identifier [Axis]: Peraton Corp, Capital Goods 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	128.8
Fair Value, ending balance		130.4	[13],[14]			128.8	[1],[11]
Investment, Identifier [Axis]: Performance Health Holdings Inc, Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[12],[20],[41]	105.4
Fair Value, ending balance		106.3	[13],[14],[16],[22],[42]			105.4	[1],[11],[12],[20],[41]
Investment, Identifier [Axis]: Petroplex Acidizing Inc, Preferred Stock A, Equity/Other
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.0	0.0
Gross Additions	[2]					0.0
Gross Reductions	[4]					0.0
Net Realized Gain (Loss)						(4.9)
Net Change in Unrealized Appreciation (Depreciation)						4.9
Fair Value, ending balance						0.0
Investment Income	[6]					0.0
PIK Income	[6]					0.0
Fee income	[6]					0.0
Dividend and Other Income	[6]					0.0
Investment, Identifier [Axis]: Petroplex Acidizing Inc, Senior Secured Loans—First Lien
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			9.7	9.7
Gross Additions	[2]					0.0
Gross Reductions	[4]					(16.7)
Net Realized Gain (Loss)						(5.3)
Net Change in Unrealized Appreciation (Depreciation)						12.3
Fair Value, ending balance						0.0
Investment Income	[6]					0.0
PIK Income	[6]					0.0
Fee income	[6]					0.0
Dividend and Other Income	[6]					0.0
Investment, Identifier [Axis]: Petroplex Acidizing Inc, Trade Claim, Energy
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[13],[32]	0.6
Fair Value, ending balance	[13],[32]	0.3				0.6	[1]
Investment, Identifier [Axis]: Polyconcept North America Inc, Class A - 1 Units, Household & Personal Products
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	10.3
Fair Value, ending balance		10.3	[13]			10.3	[1],[11]
Investment, Identifier [Axis]: Pretium Partners LLC P2, Term Loan, Real Estate
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	32.9
Fair Value, ending balance	[1],[11],[28]					32.9
Investment, Identifier [Axis]: Prime ST LLC, Private Equity, Equity Real Estate Investment Trusts (REITs)
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[32],[33],[34]	0.0
Investment, Identifier [Axis]: Prime ST LLC, Private Equity, Real Estate
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[28],[35]	0.0
Fair Value, ending balance	[1],[11],[27],[28],[35]					0.0
Investment, Identifier [Axis]: Prime ST LLC, Structured Mezzanine, Equity Real Estate Investment Trusts (REITs)
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[33],[34]	39.6
Investment, Identifier [Axis]: Prime ST LLC, Structured Mezzanine, Real Estate
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28],[35]	43.5
Fair Value, ending balance	[1],[11],[28],[35]					43.5
Investment, Identifier [Axis]: Prime St LLC, Private Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			9.1	9.1
Gross Additions		0.0	[2]			0.0	[3]
Gross Reductions		(0.1)	[4]			(0.3)	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		0.1				(8.8)
Fair Value, ending balance		0.0				0.0
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: Prime St LLC, Structured Mezzanine
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		43.5			52.4	52.4
Gross Additions		0.0	[2]			3.3	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		(3.9)				(12.2)
Fair Value, ending balance		39.6				43.5
Investment Income		0.8	[6]			3.2	[7]
PIK Income		0.8	[6]			3.1	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: Production Resource Group LLC 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		152.5			133.3	133.3
Gross Additions		4.6	[2]			19.3	[3]
Gross Reductions		(0.3)	[4]			(0.3)	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		(0.6)				0.2
Fair Value, ending balance		156.2				152.5
Investment Income		4.8	[6]			12.9	[7]
PIK Income		2.1	[6]			8.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: Production Resource Group LLC 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.1			0.1	0.1
Gross Additions		0.0	[2]			0.0	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0				0.0
Fair Value, ending balance		0.1				0.1
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: Production Resource Group LLC 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		68.1			64.4	64.4
Gross Additions		0.9	[2]			3.7	[3]
Gross Reductions		(0.7)	[4]			(0.6)	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		(0.5)				0.6
Fair Value, ending balance		67.8				68.1
Investment Income		1.9	[6]			6.4	[7]
PIK Income		0.5	[6]			2.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: Production Resource Group LLC 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		31.3			20.2	20.2
Gross Additions		0.3	[2]			11.1	[3]
Gross Reductions		(0.4)	[4]			(0.3)	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		(0.1)				0.3
Fair Value, ending balance		31.1				31.3
Investment Income		0.8	[6]			0.0	[7]
PIK Income		0.2	[6]			0.9	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: Production Resource Group LLC, Media & Entertainment 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[35]	64.6
Fair Value, ending balance		64.3	[13],[14],[34]			64.6	[1],[11],[35]
Investment, Identifier [Axis]: Production Resource Group LLC, Media & Entertainment 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[35]	152.5
Fair Value, ending balance		156.2	[13],[14],[34]			152.5	[1],[11],[35]
Investment, Identifier [Axis]: Production Resource Group LLC, Media & Entertainment 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[35]	0.1
Fair Value, ending balance		0.1	[13],[14],[34]			0.1	[1],[11],[35]
Investment, Identifier [Axis]: Production Resource Group LLC, Media & Entertainment 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[35]	34.8
Fair Value, ending balance		34.6	[13],[14],[34]			34.8	[1],[11],[35]
Investment, Identifier [Axis]: Project Marron, Consumer Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		52.0
Fair Value, ending balance						52.0
Investment, Identifier [Axis]: Project Marron, Consumer Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		36.3
Fair Value, ending balance						36.3
Investment, Identifier [Axis]: Proserv Acquisition LLC, Class A Common Units
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		1.1
Gross Additions	[2]	0.0
Gross Reductions	[4]	0.0
Net Realized Gain (Loss)		0.0
Net Change in Unrealized Appreciation (Depreciation)		0.8
Fair Value, ending balance		1.9				1.1
Investment Income	[6]	0.0
PIK Income	[6]	0.0
Fee income	[6]	0.0
Dividend and Other Income	[6]	0.0
Investment, Identifier [Axis]: Proserv Acquisition LLC, Class A Common Units, Energy
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[28],[43]	1.1
Fair Value, ending balance		1.9	[13],[32],[33],[44]			1.1	[1],[11],[27],[28],[43]
Investment, Identifier [Axis]: Proserv Acquisition LLC, Class A Common Units, Equity/Other
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		1.1			0.1	0.1
Gross Additions	[2]					0.1
Gross Reductions	[4]					0.0
Net Realized Gain (Loss)						0.0
Net Change in Unrealized Appreciation (Depreciation)						0.9
Fair Value, ending balance						1.1
Investment Income	[6]					0.0
PIK Income	[6]					0.0
Fee income	[6]					0.0
Dividend and Other Income	[6]					0.0
Investment, Identifier [Axis]: Proserv Acquisition LLC, Class A Preferred Units
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		9.5
Gross Additions	[2]	0.0
Gross Reductions	[4]	0.0
Net Realized Gain (Loss)		0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0
Fair Value, ending balance		9.5				9.5
Investment Income	[6]	0.0
PIK Income	[6]	0.0
Fee income	[6]	0.0
Dividend and Other Income	[6]	0.0
Investment, Identifier [Axis]: Proserv Acquisition LLC, Class A Preferred Units, Energy
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[28],[43]	9.5
Fair Value, ending balance		9.5	[13],[32],[33],[44]			9.5	[1],[11],[27],[28],[43]
Investment, Identifier [Axis]: Proserv Acquisition LLC, Class A Preferred Units, Equity/Other
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		9.5			9.3	9.3
Gross Additions	[3]					0.0
Gross Reductions	[5]					0.0
Net Realized Gain (Loss)						0.0
Net Change in Unrealized Appreciation (Depreciation)						0.2
Fair Value, ending balance						9.5
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Pure Fishing Inc, Consumer Durables & Apparel 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[39]	22.6
Fair Value, ending balance		20.9	[13],[14],[40]			22.6	[1],[11],[39]
Investment, Identifier [Axis]: Pure Fishing Inc, Consumer Durables & Apparel 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[41]	56.1
Fair Value, ending balance		54.3	[13],[14]			56.1	[1],[11],[41]
Investment, Identifier [Axis]: Quorum Health Corp, Trade Claim, Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[13],[32]	0.9
Fair Value, ending balance	[13],[32]	0.9				0.9	[1]
Investment, Identifier [Axis]: Quorum Health Corp, Trust Initial Funding Units, Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[13],[32],[33],[54],[55]	0.2
Fair Value, ending balance	[13],[32]	0.2				0.2	[1],[33],[54],[55]
Investment, Identifier [Axis]: RSC Insurance Brokerage Inc, Insurance 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[9],[10],[11],[12],[36],[41]	236.0
Fair Value, ending balance		235.3	[13],[14],[16],[17],[18],[37]			236.0	[1],[9],[10],[11],[12],[36],[41]
Investment, Identifier [Axis]: RSC Insurance Brokerage Inc, Insurance 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	7.6
Fair Value, ending balance		4.7	[13],[14]			7.6	[1],[15]
Investment, Identifier [Axis]: RSC Insurance Brokerage Inc, Insurance 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19]	2.9
Investment, Identifier [Axis]: Radwell International LLC/PA, Capital Goods 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	1.0
Fair Value, ending balance		0.9	[13],[14]			1.0	[1],[11]
Investment, Identifier [Axis]: Radwell International LLC/PA, Capital Goods 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[9],[10],[12],[21]	92.1
Fair Value, ending balance		1.0	[14],[42]			92.1	[1],[9],[10],[12],[21]
Investment, Identifier [Axis]: Radwell International LLC/PA, Capital Goods 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	6.9
Fair Value, ending balance		92.5	[14],[16],[17],[18],[23]			6.9	[1],[15]
Investment, Identifier [Axis]: Radwell International LLC/PA, Capital Goods 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19]	6.0
Investment, Identifier [Axis]: Reliant Rehab Hospital Cincinnati LLC, Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[12],[20],[36],[41]	84.2
Fair Value, ending balance		69.8	[13],[14],[16],[18],[22],[37]			84.2	[1],[10],[11],[12],[20],[36],[41]
Investment, Identifier [Axis]: Revere Superior Holdings Inc, Software & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[41]	33.5
Fair Value, ending balance		33.0	[13],[14],[42]			33.5	[1],[11],[41]
Investment, Identifier [Axis]: Revere Superior Holdings Inc, Software & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	1.5
Fair Value, ending balance		3.2	[14],[19]			1.5	[1],[11]
Investment, Identifier [Axis]: Revere Superior Holdings Inc, Software & Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	1.7
Fair Value, ending balance	[1],[15]					1.7
Investment, Identifier [Axis]: Ridgeback Resources Inc, Common Stock, Energy
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[13],[33],[54],[55]	8.6
Fair Value, ending balance	[1],[13],[33],[54],[55]					8.6
Investment, Identifier [Axis]: Rise Baking Company, Food, Beverage & Tobacco 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	1.3
Fair Value, ending balance		0.6	[13],[14]			1.3	[1],[11]
Investment, Identifier [Axis]: Rise Baking Company, Food, Beverage & Tobacco 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[41]	27.4
Fair Value, ending balance		27.7	[13],[14],[18],[42]			27.4	[1],[10],[41]
Investment, Identifier [Axis]: Rise Baking Company, Food, Beverage & Tobacco 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	3.7
Fair Value, ending balance		4.5	[14],[19]			3.7	[1],[15]
Investment, Identifier [Axis]: Roemanu LLC (FKA Toorak Capital Partners LLC), Private Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		261.2			199.3	199.3
Gross Additions		0.1	[2]			78.3	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		(6.5)				(16.4)
Fair Value, ending balance		254.8				261.2
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		5.1	[6]			18.8	[7]
Investment, Identifier [Axis]: Roemanu LLC (FKA Toorak Capital Partners LLC), Private Equity, Financial Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[34]	254.8
Investment, Identifier [Axis]: Roemanu LLC (FKA Toorak Capital Partners LLC), Private Equity, Real Estate
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[35]	261.2
Fair Value, ending balance	[1],[11],[35]					261.2
Investment, Identifier [Axis]: Roemanu LLC (FKA Toorak Capital Partners LLC), Structured Mezzanine
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			22.0	22.0
Gross Additions	[3]					32.0
Gross Reductions	[5]					(54.0)
Net Realized Gain (Loss)						0.0
Net Change in Unrealized Appreciation (Depreciation)						0.0
Fair Value, ending balance						0.0
Investment Income	[7]					0.0
PIK Income	[7]					0.6
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: SAMBA Safety Inc, Software & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[41]	6.0
Fair Value, ending balance		6.0	[14],[42]			6.0	[1],[41]
Investment, Identifier [Axis]: SAMBA Safety Inc, Software & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	2.4
Fair Value, ending balance		0.6	[13],[14]			2.4	[1],[15]
Investment, Identifier [Axis]: SAMBA Safety Inc, Software & Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19]	1.8
Investment, Identifier [Axis]: Safe-Guard Products International LLC, Diversified Financials
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[20]	0.1
Fair Value, ending balance	[1],[20]					0.1
Investment, Identifier [Axis]: Safe-Guard Products International LLC, Financial Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[22]	0.1
Investment, Identifier [Axis]: Saluda Grade Alternative Mortgage Trust 2022-BC2, Structured Mezzanine, Real Estate 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	5.7
Fair Value, ending balance	[1],[11],[28]					5.7
Investment, Identifier [Axis]: Saluda Grade Alternative Mortgage Trust 2022-BC2, Structured Mezzanine, Real Estate 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	2.4
Fair Value, ending balance	[1],[11],[28]					2.4
Investment, Identifier [Axis]: Saluda Grade Alternative Mortgage Trust 2022-BC2, Structured Mezzanine, Real Estate Management & Development
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[33]	2.3
Investment, Identifier [Axis]: Saluda Grade Alternative Mortgage Trust 2022-BC2, Term Loan, Real Estate
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	10.3
Fair Value, ending balance	[1],[11],[28]					10.3
Investment, Identifier [Axis]: Saturn Oil & Gas Inc, Common Stock, Energy
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[32],[33],[40],[54],[55]	0.7
Investment, Identifier [Axis]: SavATree LLC, Consumer Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	5.4
Fair Value, ending balance		6.0	[13],[14]			5.4	[1],[11]
Investment, Identifier [Axis]: SavATree LLC, Consumer Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	3.9
Fair Value, ending balance		3.3	[14],[19]			3.9	[1],[15]
Investment, Identifier [Axis]: SavATree LLC, Consumer Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	6.2
Fair Value, ending balance		6.2	[14],[19]			6.2	[1],[15]
Investment, Identifier [Axis]: Sequel Youth & Family Services LLC, Class R Common Stock, Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[27],[51]	0.0
Fair Value, ending balance		0.0	[32],[52]			0.0	[1],[27],[51]
Investment, Identifier [Axis]: Sequel Youth & Family Services LLC, Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[24],[27]	0.3
Fair Value, ending balance		0.3	[13],[14],[29],[32]			0.3	[1],[11],[24],[27]
Investment, Identifier [Axis]: SitusAMC Holdings Corp, Real Estate
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[9],[10],[21]	53.2
Fair Value, ending balance	[1],[9],[10],[21]					53.2
Investment, Identifier [Axis]: SitusAMC Holdings Corp, Real Estate Management & Development
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[17],[18],[23]	53.6
Investment, Identifier [Axis]: Solera LLC, Software & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[39]	307.7
Fair Value, ending balance		303.0	[13],[14],[44]			307.7	[1],[11],[39]
Investment, Identifier [Axis]: Solina France SASU, Food, Beverage & Tobacco
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28],[41]	39.1
Fair Value, ending balance		19.4	[13],[14],[33],[42]			39.1	[1],[11],[28],[41]
Investment, Identifier [Axis]: Sorenson Communications LLC, 0.13
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[53],[56]	9.3
Fair Value, ending balance	[1],[11],[27],[53],[56]					9.3
Investment, Identifier [Axis]: Sorenson Communications LLC, Common Stock, Equity/Other
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[8]	0.0			67.5	67.5
Gross Additions	[3],[8]					0.0
Gross Reductions	[5],[8]					(65.4)
Net Realized Gain (Loss)	[8]					22.9
Net Change in Unrealized Appreciation (Depreciation)	[8]					(25.0)
Fair Value, ending balance	[8]					0.0
Investment Income	[7],[8]					0.0
PIK Income	[7],[8]					0.0
Fee income	[7],[8]					0.0
Dividend and Other Income	[7],[8]					0.0
Investment, Identifier [Axis]: Sorenson Communications LLC, Common Stock, Telecommunication Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[13],[18],[32],[54]	0.0
Fair Value, ending balance	[13],[32],[54]	0.0	[55]			0.0	[1],[18]
Investment, Identifier [Axis]: Sorenson Communications LLC, Senior Secured Loans—First Lien
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[8]	0.0			60.1	60.1
Gross Additions	[3],[8]					0.0
Gross Reductions	[5],[8]					(56.9)
Net Realized Gain (Loss)	[8]					0.0
Net Change in Unrealized Appreciation (Depreciation)	[8]					(3.2)
Fair Value, ending balance	[8]					0.0
Investment Income	[7],[8]					0.0
PIK Income	[7],[8]					0.0
Fee income	[7],[8]					0.0
Dividend and Other Income	[7],[8]					0.0
Investment, Identifier [Axis]: Sorenson Communications LLC, Telecommunication Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[9],[20],[21],[39]	32.2
Fair Value, ending balance		31.0	[14],[17],[22],[23],[40]			32.2	[1],[9],[20],[21],[39]
Investment, Identifier [Axis]: Sorenson Communications LLC, Telecommunication Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[53],[56]	34.1
Fair Value, ending balance		9.1	[13],[32],[54],[55]			34.1	[1],[11],[27],[53],[56]
Investment, Identifier [Axis]: Sorenson Communications LLC, Telecommunication Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[32],[54],[55]	33.0
Investment, Identifier [Axis]: Sound United LLC, Common Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			77.5	77.5
Gross Additions	[3]					0.0
Gross Reductions	[5]					(17.3)
Net Realized Gain (Loss)						0.0
Net Change in Unrealized Appreciation (Depreciation)						(60.2)
Fair Value, ending balance						0.0
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: Sound United LLC, Common Stock, Consumer Durables & Apparel
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27]	7.0
Fair Value, ending balance	[1],[11],[27]					7.0
Investment, Identifier [Axis]: Source Code LLC, Software & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[9],[10],[21]	51.3
Fair Value, ending balance		51.6	[14],[17],[18],[23]			51.3	[1],[9],[10],[21]
Investment, Identifier [Axis]: Source Code LLC, Software & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	14.8
Fair Value, ending balance		15.0	[14],[19]			14.8	[1],[15]
Investment, Identifier [Axis]: Spins LLC, Software & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[21],[36],[41]	68.2
Fair Value, ending balance		68.0	[13],[14],[23],[37],[42]			68.2	[1],[11],[21],[36],[41]
Investment, Identifier [Axis]: Spins LLC, Software & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	16.5
Fair Value, ending balance		7.9	[14],[19]			16.5	[1],[15]
Investment, Identifier [Axis]: Spins LLC, Software & Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	7.9
Fair Value, ending balance		16.5	[14],[19]			7.9	[1],[15]
Investment, Identifier [Axis]: Spotless Brands LLC, Consumer Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14]	12.1
Investment, Identifier [Axis]: Spotless Brands LLC, Consumer Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19]	18.4
Investment, Identifier [Axis]: Staples Canada, Consumer Discretionary Distribution & Retail
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[33]	22.0
Investment, Identifier [Axis]: Staples Canada, Retailing
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	22.9
Fair Value, ending balance	[1],[11],[28]					22.9
Investment, Identifier [Axis]: Star Mountain Diversified Credit Income Fund III, LP, Private Equity, Diversified Financials
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[28],[57]	23.8
Fair Value, ending balance	[1],[28],[57]					23.8
Investment, Identifier [Axis]: Star Mountain Diversified Credit Income Fund III, LP, Private Equity, Financial Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[33],[58]	23.6
Investment, Identifier [Axis]: Stuart Weitzman Inc, Common Stock, Consumer Durables & Apparel
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27]	0.0
Fair Value, ending balance		0.0	[13],[32]			0.0	[1],[11],[27]
Investment, Identifier [Axis]: Summit Interconnect Inc, Capital Goods 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[9],[10],[11],[20],[21],[41]	128.7
Fair Value, ending balance		128.6	[13],[14],[17],[18],[22],[23],[42]			128.7	[1],[9],[10],[11],[20],[21],[41]
Investment, Identifier [Axis]: Summit Interconnect Inc, Capital Goods 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	8.9
Fair Value, ending balance		8.9	[14],[19]			8.9	[1],[15]
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.5
Gross Additions	[2]	0.0
Gross Reductions	[4]	(5.8)
Net Realized Gain (Loss)		0.0
Net Change in Unrealized Appreciation (Depreciation)		5.3
Fair Value, ending balance		0.0				0.5
Investment Income	[6]	0.0
PIK Income	[6]	0.0
Fee income	[6]	0.0
Dividend and Other Income	[6]	0.0
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc 1, Senior Secured Loans—First Lien
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[60]	0.5			6.0	6.0
Gross Additions	[60]					0.1
Gross Reductions	[60]					0.0
Net Realized Gain (Loss)	[60]					0.0
Net Change in Unrealized Appreciation (Depreciation)	[60]					(5.6)
Fair Value, ending balance	[60]					0.5
Investment Income	[60]					0.0
PIK Income	[60]					0.0
Fee income	[60]					0.0
Dividend and Other Income	[60]					0.0
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		2.0
Gross Additions	[2]	0.0
Gross Reductions	[4]	(2.0)
Net Realized Gain (Loss)		0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0
Fair Value, ending balance		0.0				2.0
Investment Income	[6]	0.0
PIK Income	[6]	0.0
Fee income	[6]	0.0
Dividend and Other Income	[6]	0.0
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc 2, Senior Secured Loans—First Lien
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[60]	2.0			0.0	0.0
Gross Additions	[60]					4.5
Gross Reductions	[60]					(2.5)
Net Realized Gain (Loss)	[60]					0.0
Net Change in Unrealized Appreciation (Depreciation)	[60]					0.0
Fair Value, ending balance	[60]					2.0
Investment Income	[60]					0.3
PIK Income	[60]					0.2
Fee income	[60]					0.3
Dividend and Other Income	[60]					0.0
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0
Gross Additions	[2]	0.0
Gross Reductions	[4]	(13.5)
Net Realized Gain (Loss)		0.0
Net Change in Unrealized Appreciation (Depreciation)		13.5
Fair Value, ending balance		0.0				0.0
Investment Income	[6]	0.0
PIK Income	[6]	0.0
Fee income	[6]	0.0
Dividend and Other Income	[6]	0.0
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc, Software & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[43]	2.0
Fair Value, ending balance		0.3	[13],[14],[29],[32]			2.0	[1],[11],[43]
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc, Software & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[24],[27],[43]	0.5
Fair Value, ending balance		0.0	[13],[14],[29],[32]			0.5	[1],[11],[24],[27],[43]
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc, Software & Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15],[43]	1.2
Fair Value, ending balance	[1],[15],[43]					1.2
Investment, Identifier [Axis]: Sungard Availability Services Capital Inc, Software & Services 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[24],[27],[43]	0.0
Fair Value, ending balance	[1],[11],[24],[27],[43]					0.0
Investment, Identifier [Axis]: Sungard Availbaility Services Capital Inc, Common Stock, Equity/Other
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[8]	0.0			0.0	0.0
Gross Additions	[3],[8]					0.0
Gross Reductions	[5],[8]					0.0
Net Realized Gain (Loss)	[8]					(6.9)
Net Change in Unrealized Appreciation (Depreciation)	[8]					6.9
Fair Value, ending balance	[8]					0.0
Investment Income	[7],[8]					0.0
PIK Income	[7],[8]					0.0
Fee income	[7],[8]					0.0
Dividend and Other Income	[7],[8]					0.0
Investment, Identifier [Axis]: Sweeping Corp of America Inc, Commercial & Professional Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[41]	72.2
Fair Value, ending balance		71.5	[13],[14],[42]			72.2	[1],[11],[41]
Investment, Identifier [Axis]: Sweeping Corp of America Inc, Commercial & Professional Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	1.0
Fair Value, ending balance		3.0	[13],[14]			1.0	[1],[11]
Investment, Identifier [Axis]: Sweeping Corp of America Inc, Commercial & Professional Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	4.7
Fair Value, ending balance		2.6	[14],[19]			4.7	[1],[15]
Investment, Identifier [Axis]: Swift Worldwide Resources Holdco Ltd, Common Stock, Energy
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27]	1.0
Fair Value, ending balance		1.1	[13],[32]			1.0	[1],[11],[27]
Investment, Identifier [Axis]: TIBCO Software Inc, Preferred Stock, Software & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	129.6
Fair Value, ending balance		129.8	[13]			129.6	[1],[11]
Investment, Identifier [Axis]: TIBCO Software Inc, Software & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[39]	35.7
Fair Value, ending balance		36.4	[13],[14],[40]			35.7	[1],[11],[39]
Investment, Identifier [Axis]: TIBCO Software Inc, Software & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[39]	0.8
Fair Value, ending balance		0.9	[13],[40]			0.8	[1],[11],[39]
Investment, Identifier [Axis]: Tangoe LLC, Software & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[36],[41]	147.2
Fair Value, ending balance		148.6	[13],[14],[37],[42],[61]			147.2	[1],[11],[36],[41]
Investment, Identifier [Axis]: Tangoe LLC, Software & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[36],[41]	2.6
Fair Value, ending balance		3.2	[13],[14],[37],[42]			2.6	[1],[11],[36],[41]
Investment, Identifier [Axis]: TeamSystem SpA, Software & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	21.4
Fair Value, ending balance		22.1	[13],[14],[33]			21.4	[1],[11],[28]
Investment, Identifier [Axis]: Tekfor HoldCo (formerly Amtek Global Technology Pte Ltd)
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		3.9
Gross Additions	[2]	0.0
Gross Reductions	[4]	0.0
Net Realized Gain (Loss)		0.0
Net Change in Unrealized Appreciation (Depreciation)		0.1
Fair Value, ending balance		4.0				3.9
Investment Income	[6]	0.0
PIK Income	[6]	0.0
Fee income	[6]	0.0
Dividend and Other Income	[6]	0.0
Investment, Identifier [Axis]: Tekfor HoldCo (formerly Amtek Global Technology Pte Ltd), Automobiles & Components
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[28],[35]	3.9
Fair Value, ending balance		4.0	[13],[14],[32],[33],[34]			3.9	[1],[11],[27],[28],[35]
Investment, Identifier [Axis]: ThermaSys Corp
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		8.6
Gross Additions	[2]	0.0
Gross Reductions	[4]	0.0
Net Realized Gain (Loss)		0.0
Net Change in Unrealized Appreciation (Depreciation)		(2.5)
Fair Value, ending balance		6.1				8.6
Investment Income	[6]	0.0
PIK Income	[6]	0.0
Fee income	[6]	0.0
Dividend and Other Income	[6]	0.0
Investment, Identifier [Axis]: ThermaSys Corp, Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[24],[27],[43]	8.6
Fair Value, ending balance		6.1	[13],[14],[29],[32],[44]			8.6	[1],[11],[24],[27],[43]
Investment, Identifier [Axis]: ThermaSys Corp, Common Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0
Gross Additions	[2]	0.0
Gross Reductions	[4]	0.0
Net Realized Gain (Loss)		0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0
Fair Value, ending balance		0.0				0.0
Investment Income	[6]	0.0
PIK Income	[6]	0.0
Fee income	[6]	0.0
Dividend and Other Income	[6]	0.0
Investment, Identifier [Axis]: ThermaSys Corp, Common Stock, Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[43],[53]	0.0
Fair Value, ending balance		0.0	[13],[32],[44],[54]			0.0	[1],[11],[27],[43],[53]
Investment, Identifier [Axis]: ThermaSys Corp, Common Stock, Equity/Other
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.0	0.0
Gross Additions	[3]					0.0
Gross Reductions	[5]					0.0
Net Realized Gain (Loss)						0.0
Net Change in Unrealized Appreciation (Depreciation)						0.0
Fair Value, ending balance						0.0
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: ThermaSys Corp, Preferred Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0
Gross Additions	[2]	0.0
Gross Reductions	[4]	0.0
Net Realized Gain (Loss)		0.0
Net Change in Unrealized Appreciation (Depreciation)		0.0
Fair Value, ending balance		0.0				0.0
Investment Income	[6]	0.0
PIK Income	[6]	0.0
Fee income	[6]	0.0
Dividend and Other Income	[6]	0.0
Investment, Identifier [Axis]: ThermaSys Corp, Preferred Stock, Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[43]	0.0
Fair Value, ending balance		0.0	[13],[32],[44]			0.0	[1],[11],[27],[43]
Investment, Identifier [Axis]: ThermaSys Corp, Preferred Stock, Equity/Other
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.0	0.0
Gross Additions	[3]					0.0
Gross Reductions	[5]					0.0
Net Realized Gain (Loss)						0.0
Net Change in Unrealized Appreciation (Depreciation)						0.0
Fair Value, ending balance						0.0
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: ThermaSys Corp, Senior Secured Loans—First Lien
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		8.6			3.5	3.5
Gross Additions	[3]					0.0
Gross Reductions	[5]					0.0
Net Realized Gain (Loss)						0.0
Net Change in Unrealized Appreciation (Depreciation)						5.1
Fair Value, ending balance						8.6
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: ThreeSixty Group, Consumer Discretionary Distribution & Retail 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[22]	45.2
Investment, Identifier [Axis]: ThreeSixty Group, Consumer Discretionary Distribution & Retail 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[22]	44.9
Investment, Identifier [Axis]: ThreeSixty Group, Retailing 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[20],[41]	45.1
Fair Value, ending balance	[1],[11],[20],[41]					45.1
Investment, Identifier [Axis]: ThreeSixty Group, Retailing 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[41]	44.8
Fair Value, ending balance	[1],[11],[41]					44.8
Investment, Identifier [Axis]: Time Manufacturing Co, Capital Goods 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	42.7
Fair Value, ending balance		42.3	[13],[14]			42.7	[1],[11]
Investment, Identifier [Axis]: Time Manufacturing Co, Capital Goods 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	6.9
Fair Value, ending balance		5.1	[13],[14]			6.9	[1],[11]
Investment, Identifier [Axis]: Time Manufacturing Co, Capital Goods 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	13.8
Fair Value, ending balance		13.9	[13],[14]			13.8	[1],[11]
Investment, Identifier [Axis]: Time Manufacturing Co, Capital Goods 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	13.9
Fair Value, ending balance		15.6	[14],[19]			13.9	[1],[15]
Investment, Identifier [Axis]: Toorak Capital Funding LLC, Membership Interest
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			1.7	1.7
Gross Additions	[3]					0.0
Gross Reductions	[5]					(1.7)
Net Realized Gain (Loss)						(0.2)
Net Change in Unrealized Appreciation (Depreciation)						0.2
Fair Value, ending balance						0.0
Investment Income	[7]					0.0
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.3
Investment, Identifier [Axis]: Transaction Services Group Ltd, Software & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	32.1
Fair Value, ending balance		31.7	[13],[14],[33]			32.1	[1],[11],[28]
Investment, Identifier [Axis]: Transaction Services Group Ltd, Software & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[20],[28]	123.5
Fair Value, ending balance		123.9	[13],[14],[22],[33]			123.5	[1],[11],[20],[28]
Investment, Identifier [Axis]: TruckPro LLC, Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[39]	9.1
Fair Value, ending balance		9.2	[13],[40]			9.1	[1],[11],[39]
Investment, Identifier [Axis]: Ultra Electronics Holdings PLC, Capital Goods 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28],[39]	1.7
Fair Value, ending balance		1.7	[14],[33],[40],[42]			1.7	[1],[11],[28],[39]
Investment, Identifier [Axis]: Ultra Electronics Holdings PLC, Capital Goods 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28],[39]	1.4
Fair Value, ending balance		1.4	[13],[14],[33],[40]			1.4	[1],[11],[28],[39]
Investment, Identifier [Axis]: Ultra Electronics Holdings PLC, Capital Goods 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	58.2
Fair Value, ending balance		58.7	[13],[33]			58.2	[1],[11],[28]
Investment, Identifier [Axis]: Ultra Electronics Holdings PLC, Capital Goods 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	53.4
Fair Value, ending balance		57.6	[13],[33]			53.4	[1],[11],[28]
Investment, Identifier [Axis]: Ultra Electronics Holdings PLC, Private Equity, Capital Goods 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[28]	6.7
Fair Value, ending balance		6.8	[13],[32],[33]			6.7	[1],[11],[27],[28]
Investment, Identifier [Axis]: Ultra Electronics Holdings PLC, Private Equity, Capital Goods 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[28]	1.2
Fair Value, ending balance		1.2	[13],[32],[33]			1.2	[1],[11],[27],[28]
Investment, Identifier [Axis]: Valeo Foods Group Ltd, Food, Beverage & Tobacco 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	3.6
Fair Value, ending balance		3.4	[13],[14],[33]			3.6	[1],[11],[28]
Investment, Identifier [Axis]: Valeo Foods Group Ltd, Food, Beverage & Tobacco 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15],[28]	2.8
Fair Value, ending balance		2.6	[14],[19],[33]			2.8	[1],[15],[28]
Investment, Identifier [Axis]: Vantage Specialty Chemicals Inc, Materials
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[39]	0.7
Fair Value, ending balance	[1],[11],[39]					0.7
Investment, Identifier [Axis]: Versatile Processing Group Inc, Class A - 2 Units, Materials
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[27],[53]	0.0
Fair Value, ending balance	[1],[27],[53]					0.0
Investment, Identifier [Axis]: Version1 Software Ltd, Software & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15],[28]	2.3
Fair Value, ending balance	[1],[15],[28]					2.3
Investment, Identifier [Axis]: Version1 Software Ltd, Software & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[33]	1.3
Investment, Identifier [Axis]: Version1 Software Ltd, Software & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19],[33]	1.1
Investment, Identifier [Axis]: VetCor Professional Practices LLC, Health Care Equipment & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	80.9
Fair Value, ending balance		89.1	[13],[14],[42]			80.9	[1],[11]
Investment, Identifier [Axis]: VetCor Professional Practices LLC, Health Care Equipment & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	1.8
Fair Value, ending balance		0.7	[13],[14]			1.8	[1],[11]
Investment, Identifier [Axis]: VetCor Professional Practices LLC, Health Care Equipment & Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	10.8
Fair Value, ending balance		3.8	[14],[19]			10.8	[1],[15]
Investment, Identifier [Axis]: VetCor Professional Practices LLC, Health Care Equipment & Services 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	4.8
Fair Value, ending balance		6.7	[14],[19]			4.8	[1],[15]
Investment, Identifier [Axis]: Warren Resources Inc
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		18.6			18.7	18.7
Gross Additions		0.2	[2]			0.6	[3]
Gross Reductions		0.0	[4]			(0.2)	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		(0.1)				(0.5)
Fair Value, ending balance		18.7				18.6
Investment Income		0.8	[6]			2.5	[7]
PIK Income		0.0	[6]			0.2	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: Warren Resources Inc, Common Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		29.2			20.4	20.4
Gross Additions		0.0	[2]			0.0	[3]
Gross Reductions		0.0	[4]			0.0	[5]
Net Realized Gain (Loss)		0.0				0.0
Net Change in Unrealized Appreciation (Depreciation)		(5.7)				8.8
Fair Value, ending balance		23.5				29.2
Investment Income		0.0	[6]			0.0	[7]
PIK Income		0.0	[6]			0.0	[7]
Fee income		0.0	[6]			0.0	[7]
Dividend and Other Income		0.0	[6]			0.0	[7]
Investment, Identifier [Axis]: Warren Resources Inc, Common Stock, Energy
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27],[35]	29.2
Fair Value, ending balance		23.5	[13],[32],[34]			29.2	[1],[11],[27],[35]
Investment, Identifier [Axis]: Warren Resources Inc, Energy
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1]	18.6
Fair Value, ending balance		18.7	[13],[14],[34]			18.6	[1]
Investment, Identifier [Axis]: Wealth Enhancement Group LLC, Diversified Financials 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	30.7
Fair Value, ending balance	[1],[11],[28]					30.7
Investment, Identifier [Axis]: Wealth Enhancement Group LLC, Diversified Financials 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15],[28]	3.2
Fair Value, ending balance	[1],[15],[28]					3.2
Investment, Identifier [Axis]: Wealth Enhancement Group LLC, Diversified Financials 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15],[28]	2.0
Fair Value, ending balance	[1],[15],[28]					2.0
Investment, Identifier [Axis]: Wealth Enhancement Group LLC, Financial Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[13],[14],[33]	3.8
Investment, Identifier [Axis]: Wealth Enhancement Group LLC, Financial Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19],[33]	2.4
Investment, Identifier [Axis]: Wealth Enhancement Group LLC, Financial Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[14],[19],[33]	2.1
Investment, Identifier [Axis]: Wittur Holding GmbH, Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[28]	86.1
Fair Value, ending balance		64.3	[13],[14],[29],[32],[33]			86.1	[1],[11],[28]
Investment, Identifier [Axis]: Woolpert Inc, Capital Goods 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[9],[10],[20],[21],[41]	88.6
Fair Value, ending balance		86.2	[13],[14],[17],[18],[22],[23],[42]			88.6	[1],[9],[10],[20],[21],[41]
Investment, Identifier [Axis]: Woolpert Inc, Capital Goods 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	66.7
Fair Value, ending balance		64.9	[13],[14]			66.7	[1],[11]
Investment, Identifier [Axis]: Woolpert Inc, Capital Goods 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	3.6
Fair Value, ending balance		3.5	[14],[19]			3.6	[1],[15]
Investment, Identifier [Axis]: Worldwise Inc, Class A Private Equity, Household & Personal Products
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27]	1.6
Fair Value, ending balance		1.6	[13],[32]			1.6	[1],[11],[27]
Investment, Identifier [Axis]: Worldwise Inc, Class B Private Equity, Household & Personal Products
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[27]	0.4
Fair Value, ending balance		0.3	[13],[32]			0.4	[1],[11],[27]
Investment, Identifier [Axis]: Worldwise Inc, Household & Personal Products 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	24.4
Fair Value, ending balance		42.3	[13],[14]			24.4	[1],[11]
Investment, Identifier [Axis]: Worldwise Inc, Household & Personal Products 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	18.5
Fair Value, ending balance		6.8	[13],[14]			18.5	[1],[11]
Investment, Identifier [Axis]: Worldwise Inc, Household & Personal Products 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	6.8
Fair Value, ending balance		14.3	[14],[19]			6.8	[1],[11]
Investment, Identifier [Axis]: Worldwise Inc, Household & Personal Products 4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	14.4
Fair Value, ending balance		6.3	[14],[19]			14.4	[1],[15]
Investment, Identifier [Axis]: Worldwise Inc, Household & Personal Products 5
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	6.3
Fair Value, ending balance	[1],[15]					6.3
Investment, Identifier [Axis]: Zendesk Inc, Software & Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	57.5
Fair Value, ending balance		58.0	[13],[14],[42]			57.5	[1],[11]
Investment, Identifier [Axis]: Zendesk Inc, Software & Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	14.4
Fair Value, ending balance		6.0	[14],[19]			14.4	[1],[15]
Investment, Identifier [Axis]: Zendesk Inc, Software & Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15]	5.9
Fair Value, ending balance		14.5	[14],[19]			5.9	[1],[15]
Investment, Identifier [Axis]: athenahealth Inc, Preferred Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		231.2
Gross Additions	[2]	0.0
Gross Reductions	[4]	0.0
Net Realized Gain (Loss)		0.0
Net Change in Unrealized Appreciation (Depreciation)		(0.5)
Fair Value, ending balance		230.7				231.2
Investment Income	[6]	0.0
PIK Income	[6]	7.2
Fee income	[6]	0.0
Dividend and Other Income	[6]	0.0
Investment, Identifier [Axis]: athenahealth Inc, Preferred Stock, Equity/Other
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		231.2			0.0	0.0
Gross Additions	[3]					311.3
Gross Reductions	[5]					(47.5)
Net Realized Gain (Loss)						(1.6)
Net Change in Unrealized Appreciation (Depreciation)						(31.0)
Fair Value, ending balance						231.2
Investment Income	[7]					0.0
PIK Income	[7]					29.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: athenahealth Inc, Preferred Stock, Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[43]	231.2
Fair Value, ending balance		230.7	[13],[14],[44]			231.2	[1],[11],[43]
Investment, Identifier [Axis]: athenahealth Inc, Senior Secured Loans—First Lien -1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			0.0	0.0
Gross Additions	[3]					6.8
Gross Reductions	[5]					(6.1)
Net Realized Gain (Loss)						(0.7)
Net Change in Unrealized Appreciation (Depreciation)						0.0
Fair Value, ending balance						0.0
Investment Income	[7]					0.2
PIK Income	[7]					0.0
Fee income	[7]					0.2
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: athenahealth Inc, Subordinated Debt
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0.0			$ 0.0	0.0
Gross Additions	[3]					5.5
Gross Reductions	[5]					(4.7)
Net Realized Gain (Loss)						(0.8)
Net Change in Unrealized Appreciation (Depreciation)						0.0
Fair Value, ending balance						0.0
Investment Income	[7]					0.1
PIK Income	[7]					0.0
Fee income	[7]					0.0
Dividend and Other Income	[7]					0.0
Investment, Identifier [Axis]: iNova Pharmaceuticals (Australia) Pty Limited, Pharmaceuticals, Biotechnology & Life Sciences
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[15],[28]	2.2
Fair Value, ending balance		$ 2.2	[14],[19],[33]			$ 2.2	[1],[15],[28]

[1] Fair value determined by the Company’s board of directors (see Note 8).

[2] Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company into this category from a different category.

[3] Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company into this category from a different category.

[4] Gross reductions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company out of this category into a different category.

[5] Gross reductions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company out of this category into a different category.

[6] Interest, PIK, fee and dividend income presented for the full three months ended March 31, 2023.

[7] Interest, PIK, fee and dividend income presented for the full year ended December 31, 2022.

[8] The Company held this investment as of December 31, 2021 but it was not deemed to be an “affiliated person” of the portfolio company as of December 31, 2021. Transfers in or out have been presented at amortized cost.

[9] Security or portion thereof held within Darby Creek LLC and is pledged as collateral supporting the amounts outstanding under a revolving credit facility with Deutsche Bank AG, New York Branch (see Note 9).

[10] Security or portion thereof held within Dunlap Funding LLC and is pledged as collateral supporting the amounts outstanding under a revolving credit facility with Deutsche Bank AG, New York Branch (see Note 9).

[11] Security or portion thereof is pledged as collateral supporting the amounts outstanding under the Senior Secured Revolving Credit Facility (see Note 9).

[12] Security or portion thereof was held within CCT Tokyo Funding LLC and was pledged as collateral supporting the amounts outstanding under the revolving credit facility with Sumitomo Mitsui Banking Corporation (see Note 9).

[13] Security or portion thereof is pledged as collateral supporting the amounts outstanding under the Senior Secured Revolving Credit Facility (see Note 9).

[14] See Note 8 for additional information regarding the fair value of the Company's financial instruments

[15] Security is an unfunded commitment. Reflects the stated spread at the time of commitment, but may not be the actual rate received upon funding.

[16] Security or portion thereof held within CCT Tokyo Funding LLC and pledged as collateral supporting the amounts outstanding under the revolving credit facility with Sumitomo Mitsui Banking Corporation (see Note 9).

[17] Security or portion thereof held within Darby Creek LLC and is pledged as collateral supporting the amounts outstanding under a revolving credit facility with Deutsche Bank AG, New York Branch (see Note 9).

[18] Security or portion thereof held within Dunlap Funding LLC and is pledged as collateral supporting the amounts outstanding under a revolving credit facility with Deutsche Bank AG, New York Branch (see Note 9)

[19] Security is an unfunded commitment. Reflects the stated spread at the time of commitment, but may not be the actual rate received upon funding

[20] Security or portion thereof held within Ambler Funding LLC and is pledged as collateral supporting the amounts outstanding under the revolving credit facility with Ally Bank (see Note 9).

[21] Security or portion thereof held within Meadowbrook Run LLC and is pledged as collateral supporting the amounts outstanding under a revolving credit facility with Morgan Stanley Senior Funding, Inc. (see Note 9).

[22] Security or portion thereof held within Ambler Funding LLC and is pledged as collateral supporting the amounts outstanding under the revolving credit facility with Ally Bank (see Note 9).

[23] Security or portion thereof held within Meadowbrook Run LLC and is pledged as collateral supporting the amounts outstanding under a revolving credit facility with Morgan Stanley Senior Funding, Inc. (see Note 9).

[24] Asset is on non-accrual status.

[25] Security held within IC Arches Investments LLC, a wholly-owned subsidiary of the Company.

[26] Security held within IC II Arches Investments, LLC, a wholly-owned subsidiary of the Company.

[27] Security is non-income producing.

[28] The investment is not a qualifying asset under the Investment Company Act of 1940, as amended. A business development company may not acquire any asset other than qualifying assets, unless, at the time the acquisition is made, qualifying assets represent at least 70% of the company’s total assets. As of December 31, 2022, 75.3% of the Company’s total assets represented qualifying assets.

[29] Asset is on non-accrual status.

[30] Security held within IC Arches Investments, LLC, a wholly-owned subsidiary of the Company.

[31] Security held within IC II Arches Investments, LLC, a wholly-owned subsidiary of the Company.

[32] Security is non-income producing.

[33] The investment, or portion of the investment is not a qualifying asset under the Investment Company Act of 1940, as amended. A business development company may not acquire any asset other than qualifying assets, unless, at the time the acquisition is made, qualifying assets represent at least 70% of the company’s total assets. As of March 31, 2023, 76.1% of the Company’s total assets represented qualifying assets.

[34] Under the Investment Company Act of 1940, as amended, the Company generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of March 31, 2023, the Company held investments in portfolio companies of which it is deemed to be an "affiliated person" and deemed to "control". During the three months ended March 31, 2023, the Company disposed of investments in portfolio companies of which it was deemed to be an "affiliated person" and deemed to "control". The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person and deemed to control as of March 31, 2023: Portfolio Company Fair Value at December 31, 2022 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation) Fair Value at March 31, 2023 Interest Income(3) PIK Income(3) Fee Income(3) Dividend and Other Income(3) Senior Secured Loans—First LienTekfor HoldCo (formerly Amtek Global Technology Pte Ltd)$3.9 $— $— $— $0.1 $4.0 $— $— $— $— ATX Networks Corp 40.6 15.8 (0.8)— — 55.6 1.4 — — — HM Dunn Co Inc35.6 — (0.3)— — 35.3 1.0 — — — HM Dunn Co Inc— — — — — — — — — — NCI Inc28.1 0.8 — — 0.3 29.2 (0.3)0.9 — — Production Resource Group LLC 152.5 4.6 (0.3)— (0.6)156.2 4.8 2.1 — — Production Resource Group LLC 0.1 — — — — 0.1 — — — — Production Resource Group LLC 68.1 0.9 (0.7)— (0.5)67.8 1.9 0.5 — — Production Resource Group LLC31.3 0.3 (0.4)— (0.1)31.1 0.8 0.2 — — Warren Resources Inc18.6 0.2 — — (0.1)18.7 0.8 — — — Other Senior Secured Debt JW Aluminum Co 78.1 0.1 — — (1.2)77.0 2.0 — — — Subordinated DebtATX Networks Corp21.9 9.3 — — 0.1 31.3 0.3 0.6 — — Hilding Anders— — — — — — — — — — Hilding Anders— — — — — — 0.5 — — — Hilding Anders— — — — — — 0.1 — — — Asset Based Finance 801 5th Ave, Seattle, Structure Mezzanine 58.9 0.1 — — (0.1)58.9 1.2 0.4 — —  801 5th Ave, Seattle, Private Equity 6.3 — — — (1.1)5.2 — — — —  Avenue One PropCo, Private Equity 31.0 4.1 — — (0.6)34.5 — — — —  Avida Holding AB, Common Stock 42.6 — — — (7.1)35.5 — — — —  Kilter Finance, Preferred Stock 99.5 — — — (0.1)99.4 3.7 — — —  Kilter Finance, Private Equity 0.5 — — — — 0.5 — — — — KKR Altitude II Offshore Aggregator LP, Partnership Interest44.4 4.6 — — 0.8 49.8 — — — —  KKR Rocket Loans Aggregator LLC, Partnership Interest 4.3 9.9 — — (0.3)13.9 — — — 0.3  My Community Homes PropCo 2, Private Equity 79.0 — (2.5)— 4.0 80.5 — — — —  Prime St LLC, Private Equity — — (0.1)— 0.1 — — — — —  Prime St LLC, Structured Mezzanine 43.5 — — — (3.9)39.6 0.8 0.8 — — Roemanu LLC (FKA Toorak Capital Partners LLC), Private Equity 261.2 0.1 — — (6.5)254.8 — — — 5.1 Credit Opportunities Partners JV, LLC Portfolio Company Fair Value at December 31, 2022 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation) Fair Value at March 31, 2023 Interest Income(3) PIK Income(3) Fee Income(3) Dividend and Other Income(3) Credit Opportunities Partners JV, LLC$1,428.3 $— $— $— $(31.7)$1,396.6 $— $— $— $57.5 Equity/OtherAmtek Global Technology Pte Ltd, Common Stock — — — — — — — — — — Amtek Global Technology Pte Ltd, Ordinary Shares — — — — — — — — — — Amtek Global Technology Pte Ltd, Private Equity — — — — — — — — — — ATX Networks Corp, Common Stock 29.2 8.2 — — 1.1 38.5 — — — — ATX Networks Corp, Class B-1 Common Stock5.0 — — — — 5.0 — — — — ATX Networks Corp, Class B-2 Common Stock9.0 — — — — 9.0 — — — — Hilding Anders, Class A Common Stock — — — — — — — — — — Hilding Anders, Class B Common Stock — — — — — — — — — — Hilding Anders, Class C Common Stock — — — — — — — — — — Hilding Anders, Equity Options — — — — — — — — — — HM Dunn Co Inc, Preferred Stock, Series A 16.9 — — — (0.3)16.6 — — — — HM Dunn Co Inc, Preferred Stock, Series B — — — — — — — — — — JW Aluminum Co, Common Stock 2.4 — — — — 2.4 — — — — JW Aluminum Co, Preferred Stock 112.5 4.5 — — 30.9 147.9 0.1 4.5 — — NCI Inc, Class A-1 Common Stock— — — — — — — — — — NCI Inc, Class B-1 Common Stock— — — — — — — — — — NCI Inc, Class C Common Stock20.2 — — — (1.1)19.1 — — — — NCI Inc, Class I-1 Common Stock— — — — — — — — — — PRG III LLC, Preferred Stock, Series A PIK105.7 — — — 33.8 139.5 — — — — PRG III LLC, Preferred Stock, Series B PIK— — — — — — — — — — Warren Resources Inc, Common Stock 29.2 — — — (5.7)23.5 — — — — Total$2,908.4 $63.5 $(5.1)$— $10.2 $2,977.0 $19.1 $10.0 $— $62.9  ______________ (1)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company into this category from a different category. (2)Gross reductions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company out of this category into a different category. (3)Interest, PIK, fee and dividend income presented for the full three months ended March 31, 2023. (4)The Company held this investment as of March 31, 2023 but it was not deemed to be an “control” of the portfolio company as of March 31, 2023.

[35] Under the Investment Company Act of 1940, as amended, the Company generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of December 31, 2022, the Company held investments in one portfolio company of which it is deemed to be an “affiliated person” and deemed to “control”. During the year ended December 31, 2022, the Company disposed of investments in one portfolio of which it was deemed to be an "affiliated person" and deemed to "control". The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person and deemed to control for the year ended December 31, 2022: Portfolio CompanyFair Value at December 31, 2021 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation)Fair Value at December 31, 2022 Interest Income(3) PIK Income(3) Fee Income(3) Dividend Income(3) Senior Secured Loans—First LienAmtek Global Technology Pte Ltd$34.8 $— $(24.3)$(4.3)$(2.3)$3.9 $— $— $— $— ATX Networks Corp46.8 0.4 (6.6)— — 40.6 3.2 1.0 — — HM Dunn Co Inc33.6 2.0 — — — 35.6 0.8 2.1 — — HM Dunn Co Inc2.0 — (2.0)— — — — — — — NCI Inc— 79.1 (21.9)(28.5)(0.6)28.1 6.5 0.4 — —  One Call Care Management Inc(5) 5.0 — (4.7)— (0.3)— — — — — Production Resource Group LLC133.3 19.3 (0.3)— 0.2 152.5 12.9 8.0 — — Production Resource Group LLC0.1 — — — — 0.1 — — — — Production Resource Group LLC64.4 3.7 (0.6)— 0.6 68.1 6.4 2.0 — —  Portfolio CompanyFair Value at December 31, 2021 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation)Fair Value at December 31, 2022 Interest Income(3) PIK Income(3) Fee Income(3) Dividend Income(3) Production Resource Group LLC20.2 11.1 (0.3)— 0.3 31.3 — 0.9 — — Warren Resources Inc18.7 0.6 (0.2)— (0.5)18.6 2.5 0.2 — — Senior Secured Loans—Second LienAmtek Global Technology Pte Ltd— — — (39.1)39.1 — — — — — Other Senior Secured DebtJW Aluminum Co81.0 0.2 — — (3.1)78.1 8.0 — — —  One Call Care Management Inc(5) 23.5 — (21.6)— (1.9)— — — — — Subordinated DebtATX Networks Corp7.1 3.6 — — 11.2 21.9 1.6 1.5 — — Hilding Anders46.6 — — — (46.6)— — — — — Hilding Anders— — — — — — 0.3 — — — Hilding Anders— — — — — — 0.1 — — — Asset Based Finance801 5th Ave, Seattle, Structure Mezzanine57.2 1.9 — — (0.2)58.9 4.7 1.7 — — 801 5th Ave, Seattle, Private Equity23.1 — (0.1)— (16.7)6.3 — — — — Avenue One PropCo, Private Equity— 46.3 (16.2)— 0.9 31.0 — — — — Avida Holding AB, Common Stock52.3 — — — (9.7)42.6 — — — — Kilter Finance, Preferred Stock36.1 87.3 (24.0)0.7 (0.6)99.5 7.4 1.9 — — Kilter Finance, Private Equity0.5 — — — — 0.5 — — — — KKR Altitude II Offshore Aggregator LP, Partnership Interest— 44.4 — — 44.4 — — — — KKR Rocket Loans Aggregator LLC, Partnership Interest1.4 2.9 — — — 4.3 — — — 1.3 My Community Homes SFR PropCo 2, Private Equity33.0 157.0 (105.7)— (5.3)79.0 — — — — Prime St LLC, Private Equity9.1 — (0.3)— (8.8)— — — — — Prime St LLC, Structured Mezzanine52.4 3.3 — — (12.2)43.5 3.2 3.1 — — Toorak Capital Funding LLC, Membership Interest1.7 — (1.7)(0.2)0.2 — — — — 0.3 Roemanu LLC (FKA Toorak Capital Partners LLC), Private Equity199.3 78.3 — — (16.4)261.2 — — — 18.8 Roemanu LLC (FKA Toorak Capital Partners LLC), Structured Mezzanine22.0 32.0 (54.0)— — — — 0.6 — — Credit Opportunities Partners JV, LLCCredit Opportunities Partners JV, LLC1,396.2 175.0 — — (142.9)1,428.3 — — — 208.3 Equity/OtherAmtek Global Technology Pte Ltd, Common Stock— — — — — — — — — — Amtek Global Technology Pte Ltd, Ordinary Shares— — — — — — — — — — Amtek Global Technology Pte Ltd, Private Equity— — — — — — — — — — ATX Networks Corp, Common Stock— 1.7 — — 27.5 29.2 — — — — ATX Networks Corp, Class B-1 Common Stock— 5.0 — — — 5.0 — — — — ATX Networks Corp, Class B-2 Common Stock— 4.0 — — 5.0 9.0 — — — — Hilding Anders, Class A Common Stock— — — — — — — — — — Hilding Anders, Class B Common Stock— — — — — — — — — —  Portfolio CompanyFair Value at December 31, 2021 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation)Fair Value at December 31, 2022 Interest Income(3) PIK Income(3) Fee Income(3) Dividend Income(3) Hilding Anders, Class C Common Stock— — — — — — — — — — Hilding Anders, Equity Options— — — — — — — — — — HM Dunn Co Inc, Preferred Stock, Series A7.1 — — — 9.8 16.9 — — — — HM Dunn Co Inc, Preferred Stock, Series B— — — — — — — — — — JW Aluminum Co, Common Stock— — — — 2.4 2.4 — — — — JW Aluminum Co, Preferred Stock122.6 22.2 — — (32.3)112.5 0.6 19.7 — —  NCI Inc, Class A-1 Common Stock(4) — — — — — — — — — —  NCI Inc, Class B-1 Common Stock(4) — — — — — — — — — —  NCI Inc, Class C Common Stock(4) — 20.2 — — — 20.2 — — — —  NCI Inc, Class I-1 Common Stock(4) — — — — — — — — — —  One Call Care Management Inc, Common Stock(5) 2.4 — (2.1)— (0.3)— — — — —  One Call Care Management Inc, Preferred Stock A(5) 26.1 — (22.8)— (3.3)— — — — —  One Call Care Management Inc, Preferred Stock B(5) 9.2 — (8.0)— (1.2)— — — — — PRG III LLC, Preferred Stock, Series A PIK17.4 — — — 88.3 105.7 — — — — PRG III LLC, Preferred Stock, Series B PIK— — — — — — — — — — Sound United LLC, Common Stock77.5 — (17.3)— (60.2)— — — — — Warren Resources Inc, Common Stock20.4 — — — 8.8 29.2 — — — — Total$2,684.1 $801.5 $(334.7)$(71.4)$(171.1)$2,908.4 $58.2 $43.1 $— $228.7  ______________ (1)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company into this category from a different category. (2)Gross reductions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company out of this category into a different category. (3)Interest, PIK, fee and dividend income presented for the full year ended December 31, 2022. (4)The Company held this investment as of December 31, 2021 but it was not deemed to be an “control” of the portfolio company as of December 31, 2021. Transfers in or out have been presented at amortized cost.

[36] Security or portion thereof held within Juniata River LLC and is pledged as collateral supporting the amounts outstanding under a term loan credit facility with JPMorgan Chase Bank, N.A. (see Note 9).

[37] Security or portion thereof held within Juniata River LLC and is pledged as collateral supporting the amounts outstanding under a term loan credit facility with JPMorgan Chase Bank, N.A. (see Note 9).

[38] Position or portion thereof unsettled as of December 31, 2022.

[39] Security is classified as Level 1 or 2 in the Company's fair value hierarchy (see Note 8).

[40] Security is classified as Level 1 or Level 2 in the Company's fair value hierarchy (see Note 8).

[41] Security or portion thereof was held within FSK CLO as of December 31, 2022.

[42] Security or portion thereof held within FS KKR MM CLO 1 LLC (see Note 9).

[43] Under the Investment Company Act of 1940, as amended, the Company generally is deemed to be an “affiliated person” of a portfolio company if it owns 5% or more of the portfolio company’s voting securities and generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of December 31, 2022, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” but is not deemed to “control”. The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person for the year ended December 31, 2022: Portfolio CompanyFair Value at December 31, 2021 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation)Fair Value at December 31, 2022 Interest Income(3) PIK Income(3) Fee Income(3) Dividend Income(3) Senior Secured Loans—First LienAffordable Care Inc$— $— $— $— $— $— $— $— $— $— Affordable Care Inc59.9 16.2 (21.4)— (1.6)53.1 4.1 — 0.2 — athenahealth Inc— 6.8 (6.1)(0.7)— — 0.2 — 0.2 — Belk Inc49.2 4.7 (2.2)(0.2)(42.7)8.8 3.7 2.7 — — Belk Inc21.9 0.1 — — (2.6)19.4 2.2 — — — Borden (New Dairy Opco)9.0 — (9.0)0.6 (0.6)— 0.1 — 0.3 — Borden (New Dairy Opco)42.0 0.1 (42.0)1.7 (1.8)— 0.9 — 1.3 — Borden Dairy Co— — — (25.4)25.4 — — — — — Constellis Holdings LLC15.0 0.4 — — (0.4)15.0 1.8 — — — Fairway Group Holdings Corp0.7 — — (1.0)0.3 — — — — —  Portfolio CompanyFair Value at December 31, 2021 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation)Fair Value at December 31, 2022 Interest Income(3) PIK Income(3) Fee Income(3) Dividend Income(3) Fairway Group Holdings Corp— — — — — — — — — — Micronics Filtration Holdings Inc51.0 5.7 (51.7)— (5.0)— 0.2 0.3 — — Petroplex Acidizing Inc9.7 — (16.7)(5.3)12.3 — — — — —  Sorenson Communications LLC(4) 60.1 — (56.9)— (3.2)— — — — —  Sungard Availability Services Capital Inc(4) 6.0 0.1 — — (5.6)0.5 — — — —  Sungard Availability Services Capital Inc(4) — 4.5 (2.5)— — 2.0 0.3 0.2 0.3 — ThermaSys Corp3.5 — — — 5.1 8.6 — — — — Senior Secured Loans—Second LienBelk Inc6.7 — — — (3.4)3.3 — — — — Constellis Holdings LLC12.0 0.3 — — 1.2 13.5 2.0 — — — Fairway Group Holdings Corp— — — — — — — — — —   Sungard Availability Services Capital Inc(4) 8.3 — (0.2)— (8.1)— — — — — Subordinated Debtathenahealth Inc— 5.5 (4.7)(0.8)— — 0.1 — — — Asset Based FinanceHome Partners JV, Structured Mezzanine90.4 7.9 (98.1)4.6 (4.8)— 0.3 7.5 — — Home Partners JV, Private Equity9.4 — (11.8)6.4 (4.0)— — — — 0.7 Home Partners JV, Common Stock80.6 — (101.0)53.4 (33.0)— — — — 4.3 Home Partners JV 2, Structured Mezzanine3.5 6.7 — 0.1 (0.1)10.2 — 0.7 — — Home Partners JV 2, Private Equity0.1 0.1 — — — 0.2 — — — — Home Partners JV 2, Private Equity1.6 2.9 — — 0.5 5.0 — — — — Jet Edge International LLC, Preferred Stock16.8 — (30.1)9.2 4.1 — 0.7 — — — Jet Edge International LLC, Warrant4.5 — (13.5)13.5 (4.5)— — — — 1.5 Jet Edge International LLC, Term Loan75.6 — (75.9)— 0.3 — 11.6 2.3 3.3 — Orchard Marine Limited, Class B Common Stock— — — (3.1)3.1 — — — — — Orchard Marine Limited, Series A Preferred Stock64.6 0.1 (66.0)3.9 (2.6)— — — — — Equity/OtherAffordable Care Inc, Common Stock52.1 — — — (2.2)49.9 — 5.5 — — athenahealth Inc, Preferred Stock— 311.3 (47.5)(1.6)(31.0)231.2 — 29.0— — Belk Inc, Common Stock— — — — — — — — — — Borden (New Dairy Opco), Common Stock7.7 — — — (2.9)4.8 — — — — Constellis Holdings LLC, Private Equity0.2 — — — 6.1 6.3 — — — — Fairway Group Holdings Corp, Common Stock— — — — — — — — — — Fronton BV, Common Stock1.4 — — — (0.4)1.0 — — — — Micronics Filtration Holdings Inc, Common Stock— — (0.1)(0.5)0.6 — — — — — Micronics Filtration Holdings Inc, Preferred Stock, Series A0.1 — — (0.6)0.5 — — — — — Micronics Filtration Holdings Inc, Preferred Stock, Series B0.4 — (0.4)0.2 (0.2)— — — — — Micronics Filtration Holdings Inc, Preferred Stock, Series B PIK11.9 — (11.9)11.9 (11.9)— — — — —  Portfolio CompanyFair Value at December 31, 2021 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation)Fair Value at December 31, 2022 Interest Income(3) PIK Income(3) Fee Income(3) Dividend Income(3) Micronics Filtration Holdings Inc, Preferred Stock, Series C PIK6.2 — (6.2)6.2 (6.2)— — — — — Petroplex Acidizing Inc, Preferred Stock A— — — (4.9)4.9 — — — — — Petroplex Acidizing Inc, Warrant— — — — — — — — — — Proserv Acquisition LLC, Class A Common Units0.1 0.1 — — 0.9 1.1 — — — — Proserv Acquisition LLC, Class A Preferred Units9.3 — — — 0.2 9.5 — — — —   Sorenson Communications LLC, Common Stock(4) 67.5 — (65.4)22.9 (25.0)— — — — —   Sungard Availability Services Capital Inc, Common Stock(4) — — — (6.9)6.9 — — — — — ThermaSys Corp, Common Stock— — — — — — — — — — ThermaSys Corp, Preferred Stock— — — — — — — — — — Total$859.0 $373.5 $(741.3)$83.6 $(131.4)$443.4 $28.2 $48.2 $5.6 $6.5  ______________ (1)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company into this category from a different category. (2)Gross reductions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company out of this category into a different category. (3)Interest, PIK, fee and dividend income presented for the full year ended December 31, 2022. (4)The Company held this investment as of December 31, 2021 but it was not deemed to be an “affiliated person” of the portfolio company as of December 31, 2021. Transfers in or out have been presented at amortized cost.

[44] Under the Investment Company Act of 1940, as amended, the Company generally is deemed to be an “affiliated person” of a portfolio company if it owns 5% or more of the portfolio company’s voting securities and generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of March 31, 2023, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” but is not deemed to “control”. The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person as of March 31, 2023: Portfolio Company Fair Value at December 31, 2022 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation) Fair Value at March 31, 2023 Interest Income(3) PIK Income(3) Fee Income(3) Dividend and Other Income(3) Senior Secured Loans—First LienAffordable Care Inc$53.1 $2.9 $(1.5)$— $0.7 $55.2 $1.3 $0.2 $— $— Belk Inc8.8 0.9 (1.3)0.2 3.9 12.5 — — — — Belk Inc19.4 — — — (0.7)18.7 0.7 — — — Constellis Holdings LLC15.0 0.1 — — (0.1)15.0 0.6 — — —  Sungard Availability Services Capital Inc(4) 0.5 — (5.8)— 5.3 — — — — —  Sungard Availability Services Capital Inc(4) 2.0 — (2.0)— — — — — — — ThermaSys Corp8.6 — — — (2.5)6.1 — — — — Senior Secured Loans—Second LienBelk Inc 3.3 — — — (3.3)— — — — — Constellis Holdings LLC 13.5 — — — — 13.5 0.6 — — —  Sungard Availability Services Capital Inc(4) — — (13.5)— 13.5 — — — — — Asset Based FinanceHome Partners JV 2, Structured Mezzanine10.2 0.3 — — — 10.5 — 0.3 — — Home Partners JV 2, Private Equity 0.2 — — — — 0.2 — — — — Home Partners JV 2, Private Equity 5.0 — — — (0.5)4.5 — — — — Equity/OtherAffordable Care Inc, Preferred Stock 49.9 — — — (0.8)49.1 — 1.4 — — athenahealth Inc, Preferred Stock 231.2 — — — (0.5)230.7 — 7.2 — — Belk Inc, Common Stock — — — — — — — — — — Borden (New Dairy Opco), Common Stock 4.8 — — — 1.9 6.7 — — — — Constellis Holdings LLC, Private Equity 6.3 — — — (2.4)3.9 — — — — Fronton BV, Common Stock 1.0 — — — 0.2 1.2 — — — — Proserv Acquisition LLC, Class A Common Units 1.1 — — — 0.8 1.9 — — — — Proserv Acquisition LLC, Class A Preferred Units 9.5 — — — — 9.5 — — — — ThermaSys Corp, Common Stock — — — — — — — — — — ThermaSys Corp, Preferred Stock — — — — — — — — — — Total$443.4 $4.2 $(24.1)$0.2 $15.5 $439.2 $3.2 $9.1 $— $—  ______________ (1)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company into this category from a different category. (2)Gross reductions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company out of this category into a different category. (3)Interest, PIK, fee and dividend income presented for the full three months ended March 31, 2023. (4)The Company held this investment as of March 31, 2023 but it was not deemed to be an “affiliated person” of the portfolio company as of March 31, 2023.

[45] Security or portion thereof was held within CCT Dublin Funding Limited

[46] Security or portion thereof held within CCT Dublin Funding Limited.

[47] Security held within CCT Holdings II, LLC, a wholly-owned subsidiary of the Company.

[48] Security held within CCT Holdings II, LLC, a wholly-owned subsidiary of the Company

[49] Security held within IC American Energy Investments, Inc., a wholly-owned subsidiary of the Company.

[50] Security held within IC American Energy Investments, Inc., a wholly-owned subsidiary of the Company.

[51] Security held within FSIC II Investments, Inc., a wholly-owned subsidiary of the Company.

[52] Security held within FSIC II Investments, Inc., a wholly-owned subsidiary of the Company.

[53] Security or portion thereof held within Race Street Funding LLC. Security is available as collateral supporting the amounts outstanding under the Senior Secured Revolving Credit Facility (see Note 9).

[54] Security or portion thereof held within Race Street Funding LLC. Security is available as collateral to support the amounts outstanding under the Senior Secured Revolving Credit Facility (see Note 9).

[55] Security or portion thereof held within Cobbs Creek LLC and is pledged as collateral supporting the amounts outstanding under the senior secured revolving credit facility (see Note 9).

[56] Security or portion thereof held within Cobbs Creek LLC and is pledged as collateral supporting the amounts outstanding under the senior secured revolving credit facility (see Note 9).

[57] Security held within FSIC Investments, Inc., a wholly-owned subsidiary of the Company.

[58] Security held within FSIC Investments, Inc., a wholly-owned subsidiary of the Company.

[59] The Company held this investment as of December 31, 2022 but it was not deemed to be an “control” of the portfolio company as of December 31, 2022. Transfers in or out have been presented at amortized cost.

[60] The Company held this investment as of March 31, 2023 but it was not deemed to be an “affiliated person” of the portfolio company as of March 31, 2023.

[61] Position or portion thereof unsettled as of March 31, 2023.