v3.26.1
Fair Value of Financial Instruments - Summary of Changes In Fair Value of Company's Level 3 Debt (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Transfers into/(out of) of Level 3 $ 0  
Significant Unobservable Inputs (Level 3)    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning balance 2,386,232,000 $ 1,710,169,000
Purchases, net of deferred fees 303,166,000 1,453,204,000
Proceeds from sales and paydowns (238,316,000) (819,165,000)
Accretion of OID, EOT, and PIK payments 15,627,000 50,680,000
Net realized gain/(loss) $ (9,930,000) $ (64,114,000)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Realized gain Realized gain
Net change in unrealized appreciation/(depreciation) $ (5,943,000) $ 55,458,000
Fair Value, Ending balance 2,450,836,000 2,386,232,000
Net change in unrealized appreciation/(depreciation) on Level 3 investments still held (18,857,000) 16,840,000
Debt | Significant Unobservable Inputs (Level 3)    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning balance 2,199,964,000 1,602,131,000
Purchases, net of deferred fees 285,852,000 1,396,567,000
Non-cash conversions (25,912,000) (4,640,000)
Proceeds from sales and paydowns (228,864,000) (809,842,000)
Accretion of OID, EOT, and PIK payments 15,429,000 50,593,000
Net realized gain/(loss) (11,581,000) (62,262,000)
Net change in unrealized appreciation/(depreciation) (5,375,000) 27,417,000
Fair Value, Ending balance 2,229,513,000 2,199,964,000
Net change in unrealized appreciation/(depreciation) on Level 3 investments still held (15,842,000) (9,319,000)
Equity | Significant Unobservable Inputs (Level 3)    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning balance 108,342,000 56,584,000
Purchases, net of deferred fees 15,507,000 36,056,000
Non-cash conversions 25,919,000 4,751,000
Proceeds from sales and paydowns (8,324,000) (4,000,000)
Accretion of OID, EOT, and PIK payments 198,000 87,000
Net realized gain/(loss) 2,974,000 (679,000)
Net change in unrealized appreciation/(depreciation) 5,501,000 15,543,000
Fair Value, Ending balance 150,117,000 108,342,000
Net change in unrealized appreciation/(depreciation) on Level 3 investments still held 4,338,000 13,717,000
Warrants | Significant Unobservable Inputs (Level 3)    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning balance 77,926,000 51,454,000
Purchases, net of deferred fees 1,807,000 20,581,000
Non-cash conversions (7,000) (111,000)
Proceeds from sales and paydowns (1,128,000) (5,323,000)
Net realized gain/(loss) (1,323,000) (1,173,000)
Net change in unrealized appreciation/(depreciation) (6,069,000) 12,498,000
Fair Value, Ending balance 71,206,000 77,926,000
Net change in unrealized appreciation/(depreciation) on Level 3 investments still held $ (7,353,000) $ 12,442,000