v3.26.1
Fair Value Measurement - Summary of Assets and Liabilities Categorized Within Fair Value Hierarchy (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Assets    
Debt investments, Fair Value $ 3,228,940 $ 3,261,721
Debt investments, Fair Value 3,231,467 3,298,052
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign Currency Forward Contracts    
Assets    
Unrealized appreciation (depreciation) 0 (252)
Liabilities    
Unrealized Appreciation (Depreciation) 0 (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) 0 (252)
Liabilities    
Unrealized Appreciation (Depreciation) 0 (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) (7,999) (3,570)
Liabilities    
Unrealized Appreciation (Depreciation) (7,999) (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) (7,999) (3,570)
Liabilities    
Unrealized Appreciation (Depreciation) (7,999) (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) (7,999) (3,822)
Liabilities    
Unrealized Appreciation (Depreciation) (7,999) (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) (7,999) (3,822)
Liabilities    
Unrealized Appreciation (Depreciation) (7,999) (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 3,002,029 3,028,788
1st Lien/Last-Out Unitranche    
Assets    
Debt investments, Fair Value 130,886 135,156
2nd Lien/Senior Secured Debt    
Assets    
Debt investments, Fair Value 52,766 47,914
Unsecured Debt    
Assets    
Debt investments, Fair Value 8,521 8,476
Preferred Stock    
Assets    
Equity, Fair Value 20,124 26,426
Common Stock    
Assets    
Equity, Fair Value 14,153 14,714
Warrants    
Assets    
Warrants, Fair Value 461 247
Affiliated Money Market Fund    
Assets    
Debt investments, Fair Value 2,476 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) 51 0
Liabilities    
Unrealized Appreciation (Depreciation) 51 0
Level 1    
Assets    
Debt investments, Fair Value 2,506 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 30 52
Level 1 | Warrants    
Assets    
Warrants, Fair Value 0 0
Level 1 | Affiliated Money Market Fund    
Assets    
Debt investments, Fair Value 2,476 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 80,547 54,749
Level 2 | 1st Lien/Senior Secured Debt    
Assets    
Debt investments, Fair Value 80,496 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) 51 0
Liabilities    
Unrealized Appreciation (Depreciation) 51 0
Level 3    
Assets    
Debt investments, Fair Value 3,148,414 3,207,527
Debt investments, Fair Value 3,148,414 3,207,527
Level 3 | 1st Lien/Senior Secured Debt    
Assets    
Debt investments, Fair Value 2,921,533 2,974,646
Level 3 | 1st Lien/Last-Out Unitranche    
Assets    
Debt investments, Fair Value 130,886 135,156
Level 3 | 2nd Lien/Senior Secured Debt    
Assets    
Debt investments, Fair Value 52,766 47,914
Level 3 | Unsecured Debt    
Assets    
Debt investments, Fair Value 8,521 8,476
Level 3 | Preferred Stock    
Assets    
Equity, Fair Value 20,124 26,426
Level 3 | Common Stock    
Assets    
Equity, Fair Value 14,123 14,662
Level 3 | Warrants    
Assets    
Warrants, Fair Value 461 247
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