Investments - Geographic Composition of Investments at Cost and Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Schedule of Investments [Line Items]
Cost	$ 2,833,404	$ 2,767,878
Fair Value	$ 2,845,622	$ 2,783,476
% of Total Investments at Fair Value	100.00%	100.00%
Canada
Schedule of Investments [Line Items]
Cost	$ 20,862	$ 20,395
Fair Value	$ 21,287	$ 20,797
% of Total Investments at Fair Value	0.75%	0.75%
France
Schedule of Investments [Line Items]
Cost	$ 52,331	$ 52,265
Fair Value	$ 52,565	$ 53,325
% of Total Investments at Fair Value	1.84%	1.92%
Germany
Schedule of Investments [Line Items]
Cost	$ 42,117	$ 42,191
Fair Value	$ 42,851	$ 43,947
% of Total Investments at Fair Value	1.51%	1.58%
Italy
Schedule of Investments [Line Items]
Cost	$ 81,844	$ 81,781
Fair Value	$ 80,469	$ 82,397
% of Total Investments at Fair Value	2.83%	2.96%
Sweden
Schedule of Investments [Line Items]
Cost	$ 45,664	$ 76,495
Fair Value	$ 45,845	$ 76,368
% of Total Investments at Fair Value	1.61%	2.74%
United States
Schedule of Investments [Line Items]
Cost	$ 2,590,586	$ 2,494,751
Fair Value	$ 2,602,605	$ 2,506,642
% of Total Investments at Fair Value	91.46%	90.05%