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		11.10%	11.60%
United States - Northeast
Schedule Of Available For Sale Securities [Line Items]
Investment fair value percentage		25.90%	25.40%
United States - South
Schedule Of Available For Sale Securities [Line Items]
Investment fair value percentage		21.50%	24.30%
United States - West
Schedule Of Available For Sale Securities [Line Items]
Investment fair value percentage		31.00%	30.70%
Australia
Schedule Of Available For Sale Securities [Line Items]
Investment fair value percentage		1.90%	2.20%
Canada
Schedule Of Available For Sale Securities [Line Items]
Investment fair value percentage		4.40%	4.30%
Finland
Schedule Of Available For Sale Securities [Line Items]
Investment fair value percentage	[1]	0.00%
Germany
Schedule Of Available For Sale Securities [Line Items]
Investment fair value percentage		0.30%	0.10%
Luxembourg
Schedule Of Available For Sale Securities [Line Items]
Investment fair value percentage		0.10%	0.10%
Netherlands
Schedule Of Available For Sale Securities [Line Items]
Investment fair value percentage		0.10%
Norway
Schedule Of Available For Sale Securities [Line Items]
Investment fair value percentage		0.70%	0.70%
United Kingdom
Schedule Of Available For Sale Securities [Line Items]
Investment fair value percentage		3.00%	0.60%

[1] Value sums to less than 0.1%.