Fair Value of Financial Instruments - Schedule of Fair Value Hierarchy of Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Cash	$ 135,279	$ 64,899
Total Investments at fair value	5,083,969	3,807,639
First-lien senior secured debt investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	4,355,248	3,068,392
Second-lien senior secured debt investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	156,068	186,796
Unsecured debt investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	111,413	73,823
Preferred equity investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	306,747	370,458
Common equity investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	152,306	108,170
Interest Rate Swap
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Interest rate swaps	23,189
Level 1
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Cash	135,279	64,899
Total Investments at fair value	0	0
Level 1 | First-lien senior secured debt investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	0	0
Level 1 | Second-lien senior secured debt investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	0	0
Level 1 | Unsecured debt investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	0	0
Level 1 | Preferred equity investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	0	0
Level 1 | Common equity investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	0	0
Level 1 | Interest Rate Swap
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Interest rate swaps	0
Level 2
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	351,602	190,131
Level 2 | First-lien senior secured debt investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	285,109	169,676
Level 2 | Second-lien senior secured debt investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	66,493	0
Level 2 | Unsecured debt investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	0	20,455
Level 2 | Preferred equity investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	0	0
Level 2 | Common equity investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	0	0
Level 2 | Interest Rate Swap
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Interest rate swaps	23,189
Level 3
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	4,730,180	3,617,508
Level 3 | First-lien senior secured debt investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	4,070,139	2,898,716
Level 3 | Second-lien senior secured debt investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	89,575	186,796
Level 3 | Unsecured debt investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	111,413	53,368
Level 3 | Preferred equity investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	306,747	370,458
Level 3 | Common equity investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	152,306	108,170
Level 3 | Interest Rate Swap
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Interest rate swaps	0
Levels 1, Level 2, and Level 3
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	5,081,782	3,807,639
Levels 1, Level 2, and Level 3 | First-lien senior secured debt investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	4,355,248	3,068,392
Levels 1, Level 2, and Level 3 | Second-lien senior secured debt investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	156,068	186,796
Levels 1, Level 2, and Level 3 | Unsecured debt investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	111,413	73,823
Levels 1, Level 2, and Level 3 | Preferred equity investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	306,747	370,458
Levels 1, Level 2, and Level 3 | Common equity investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	152,306	$ 108,170
Investments measured at Net Asset Value
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Investments at fair value	$ 2,187