Investments at Fair Value - Summary of Geographic Composition of Investments at Fair Value (Details)	Sep. 30, 2023	Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]
Investment fair value percentage	100.00%	100.00%
United States - Midwest
Schedule Of Available For Sale Securities [Line Items]
Investment fair value percentage	23.80%	18.10%
United States - Northeast
Schedule Of Available For Sale Securities [Line Items]
Investment fair value percentage	21.70%	45.50%
United States - South
Schedule Of Available For Sale Securities [Line Items]
Investment fair value percentage	0.30%	0.70%
United States - West
Schedule Of Available For Sale Securities [Line Items]
Investment fair value percentage	42.50%	32.50%
Canada
Schedule Of Available For Sale Securities [Line Items]
Investment fair value percentage	1.90%
Finland
Schedule Of Available For Sale Securities [Line Items]
Investment fair value percentage	0.00%
Germany
Schedule Of Available For Sale Securities [Line Items]
Investment fair value percentage	0.40%	0.40%
Luxembourg
Schedule Of Available For Sale Securities [Line Items]
Investment fair value percentage	0.20%	0.40%
Netherlands
Schedule Of Available For Sale Securities [Line Items]
Investment fair value percentage	0.20%
Norway
Schedule Of Available For Sale Securities [Line Items]
Investment fair value percentage	1.10%	2.40%
United Kingdom
Schedule Of Available For Sale Securities [Line Items]
Investment fair value percentage	7.90%