Fair Value Measurement - Summary of Assets Categorized Within Fair Value Hierarchy (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2026	Dec. 31, 2025
Assets
Debt investments, Fair Value	$ 3,195,248	$ 3,261,721
Debt investments, Fair Value	3,231,538	3,298,052
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign Currency Forward Contracts
Assets
Unrealized appreciation (depreciation)	(2)	(252)
Liabilities
Unrealized Appreciation (Depreciation)	(2)	(252)
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign Currency Forward Contracts Level 1
Assets
Unrealized appreciation (depreciation)	0	0
Liabilities
Unrealized Appreciation (Depreciation)	0	0
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign Currency Forward Contracts Level 2
Assets
Unrealized appreciation (depreciation)	(2)	(252)
Liabilities
Unrealized Appreciation (Depreciation)	(2)	(252)
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign Currency Forward Contracts Level 3
Assets
Unrealized appreciation (depreciation)	0	0
Liabilities
Unrealized Appreciation (Depreciation)	0	0
Open Forward Foreign Currency Contract, Identifier [Axis]: Interest Rate Swaps
Assets
Unrealized appreciation (depreciation)	(16,450)	(3,570)
Liabilities
Unrealized Appreciation (Depreciation)	(16,450)	(3,570)
Open Forward Foreign Currency Contract, Identifier [Axis]: Interest Rate Swaps Level 1
Assets
Unrealized appreciation (depreciation)	0	0
Liabilities
Unrealized Appreciation (Depreciation)	0	0
Open Forward Foreign Currency Contract, Identifier [Axis]: Interest Rate Swaps Level 2
Assets
Unrealized appreciation (depreciation)	(16,450)	(3,570)
Liabilities
Unrealized Appreciation (Depreciation)	(16,450)	(3,570)
Open Forward Foreign Currency Contract, Identifier [Axis]: Interest Rate Swaps Level 3
Assets
Unrealized appreciation (depreciation)	0	0
Liabilities
Unrealized Appreciation (Depreciation)	0	0
Open Forward Foreign Currency Contract, Identifier [Axis]: Total Liabilities
Assets
Unrealized appreciation (depreciation)	(16,452)	(3,822)
Liabilities
Unrealized Appreciation (Depreciation)	(16,452)	(3,822)
Open Forward Foreign Currency Contract, Identifier [Axis]: Total Liabilities Level 1
Assets
Unrealized appreciation (depreciation)	0	0
Liabilities
Unrealized Appreciation (Depreciation)	0	0
Open Forward Foreign Currency Contract, Identifier [Axis]: Total Liabilities Level 2
Assets
Unrealized appreciation (depreciation)	(16,452)	(3,822)
Liabilities
Unrealized Appreciation (Depreciation)	(16,452)	(3,822)
Open Forward Foreign Currency Contract, Identifier [Axis]: Total Liabilities Level 3
Assets
Unrealized appreciation (depreciation)	0	0
Liabilities
Unrealized Appreciation (Depreciation)	0	0
1st Lien/Senior Secured Debt
Assets
Debt investments, Fair Value	2,963,331	3,028,788
1st Lien/Last-Out Unitranche
Assets
Debt investments, Fair Value	132,155	135,156
2nd Lien/Senior Secured Debt
Assets
Debt investments, Fair Value	55,118	47,914
Unsecured Debt
Assets
Debt investments, Fair Value	8,569	8,476
Preferred Stock
Assets
Equity, Fair Value	20,231	26,426
Common Stock
Assets
Equity, Fair Value	15,437	14,714
Warrants
Assets
Warrants, Fair Value	407	247
Affiliated Money Market Fund
Assets
Debt investments, Fair Value	36,226	35,724
Interest Rate Swaps
Assets
Unrealized appreciation (depreciation)	0	607
Liabilities
Unrealized Appreciation (Depreciation)	0	607
Foreign Currency Forward Contracts
Assets
Unrealized appreciation (depreciation)	64	0
Liabilities
Unrealized Appreciation (Depreciation)	64	0
Level 1
Assets
Debt investments, Fair Value	36,275	35,776
Level 1 \| 1st Lien/Senior Secured Debt
Assets
Debt investments, Fair Value	0	0
Level 1 \| 1st Lien/Last-Out Unitranche
Assets
Debt investments, Fair Value	0	0
Level 1 \| 2nd Lien/Senior Secured Debt
Assets
Debt investments, Fair Value	0	0
Level 1 \| Unsecured Debt
Assets
Debt investments, Fair Value	0	0
Level 1 \| Preferred Stock
Assets
Equity, Fair Value	0	0
Level 1 \| Common Stock
Assets
Equity, Fair Value	49	52
Level 1 \| Warrants
Assets
Warrants, Fair Value	0	0
Level 1 \| Affiliated Money Market Fund
Assets
Debt investments, Fair Value	36,226	35,724
Level 1 \| Interest Rate Swaps
Assets
Unrealized appreciation (depreciation)	0	0
Liabilities
Unrealized Appreciation (Depreciation)	0	0
Level 1 \| Foreign Currency Forward Contracts
Assets
Unrealized appreciation (depreciation)	0	0
Liabilities
Unrealized Appreciation (Depreciation)	0	0
Level 2
Assets
Debt investments, Fair Value	19,934	54,749
Level 2 \| 1st Lien/Senior Secured Debt
Assets
Debt investments, Fair Value	19,870	54,142
Level 2 \| 1st Lien/Last-Out Unitranche
Assets
Debt investments, Fair Value	0	0
Level 2 \| 2nd Lien/Senior Secured Debt
Assets
Debt investments, Fair Value	0	0
Level 2 \| Unsecured Debt
Assets
Debt investments, Fair Value	0	0
Level 2 \| Preferred Stock
Assets
Equity, Fair Value	0	0
Level 2 \| Common Stock
Assets
Equity, Fair Value	0	0
Level 2 \| Warrants
Assets
Warrants, Fair Value	0	0
Level 2 \| Affiliated Money Market Fund
Assets
Debt investments, Fair Value	0	0
Level 2 \| Interest Rate Swaps
Assets
Unrealized appreciation (depreciation)	0	607
Liabilities
Unrealized Appreciation (Depreciation)	0	607
Level 2 \| Foreign Currency Forward Contracts
Assets
Unrealized appreciation (depreciation)	64	0
Liabilities
Unrealized Appreciation (Depreciation)	64	0
Level 3
Assets
Debt investments, Fair Value	3,175,329	3,207,527
Debt investments, Fair Value	3,175,329	3,207,527
Level 3 \| 1st Lien/Senior Secured Debt
Assets
Debt investments, Fair Value	2,943,461	2,974,646
Level 3 \| 1st Lien/Last-Out Unitranche
Assets
Debt investments, Fair Value	132,155	135,156
Level 3 \| 2nd Lien/Senior Secured Debt
Assets
Debt investments, Fair Value	55,118	47,914
Level 3 \| Unsecured Debt
Assets
Debt investments, Fair Value	8,569	8,476
Level 3 \| Preferred Stock
Assets
Equity, Fair Value	20,231	26,426
Level 3 \| Common Stock
Assets
Equity, Fair Value	15,388	14,662
Level 3 \| Warrants
Assets
Warrants, Fair Value	407	247
Level 3 \| Affiliated Money Market Fund
Assets
Debt investments, Fair Value	0	0
Level 3 \| Interest Rate Swaps
Assets
Unrealized appreciation (depreciation)	0	0
Liabilities
Unrealized Appreciation (Depreciation)	0	0
Level 3 \| Foreign Currency Forward Contracts
Assets
Unrealized appreciation (depreciation)	0	0
Liabilities
Unrealized Appreciation (Depreciation)	$ 0	$ 0