v3.26.1
Investments - Schedule of Changes in Fair Value of Investments (Details) - Level 3 - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Schedule of Investments [Line Items]    
Fair value, Beginning balance $ 18,656,857 $ 11,204,513
Net realized gains (losses) (2,092) 4,275
Net change in unrealized gains (losses) $ (274,087) $ 61,611
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments
Net amortization on investments $ 11,225 $ 7,547
Purchases, including capitalized PIK 2,306,407 [1] 2,603,895 [2]
Sales 456,663 [1] (628,681)
Transfers out of Level 3 (1,190) [3] (465,446) [4]
Fair Value, Ending Balance 20,240,457 12,787,714
Net change in unrealized gains (losses) on Level 3 investments still held $ (288,337) $ 41,072
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments
First Lien Secured Debt    
Schedule of Investments [Line Items]    
Fair value, Beginning balance $ 18,598,394 [5] $ 11,191,529 [6]
Net realized gains (losses) (2,092) [5] 4,275 [6]
Net change in unrealized gains (losses) (273,279) [5] 67,227 [6]
Net amortization on investments 11,148 [5] 7,547 [6]
Purchases, including capitalized PIK 2,241,592 [1],[5] 2,600,352 [2],[6]
Sales 456,663 [1],[5] (628,681) [2],[6]
Transfers out of Level 3 [2],[4]   (465,446)
Fair Value, Ending Balance 20,119,100 [5] 12,776,803 [6]
Net change in unrealized gains (losses) on Level 3 investments still held (287,529) [5] 46,688 [6]
Second Lien Secured Debt    
Schedule of Investments [Line Items]    
Fair value, Beginning balance   5,723
Net change in unrealized gains (losses)   (5,605)
Purchases, including capitalized PIK [2]   3,343
Fair Value, Ending Balance   3,462
Net change in unrealized gains (losses) on Level 3 investments still held   (5,605)
Unsecured Debt    
Schedule of Investments [Line Items]    
Fair value, Beginning balance 35,077  
Net realized gains (losses) 0  
Net change in unrealized gains (losses) (102)  
Net amortization on investments 77  
Purchases, including capitalized PIK [1] 14,383  
Fair Value, Ending Balance 49,435  
Net change in unrealized gains (losses) on Level 3 investments still held (102)  
Common Equity/Interests    
Schedule of Investments [Line Items]    
Fair value, Beginning balance 15,993 833
Net change in unrealized gains (losses) 649 (5)
Purchases, including capitalized PIK 45,494 [1] 138 [2]
Transfers out of Level 3 [3] (1,190)  
Fair Value, Ending Balance 60,946 966
Net change in unrealized gains (losses) on Level 3 investments still held 649 (5)
Preferred Equity    
Schedule of Investments [Line Items]    
Fair value, Beginning balance 7,393 6,428
Net change in unrealized gains (losses) (1,355) (6)
Purchases, including capitalized PIK 4,938 [1] 62 [2]
Fair Value, Ending Balance 10,976 6,483
Net change in unrealized gains (losses) on Level 3 investments still held $ (1,355) $ (6)
[1] Includes reorganizations and restructuring of investments.
[2] Includes reorganizations and restructuring of investments.
[3] Transfers out (if any) of Level 3 are due to an increase in the quantity and reliability of broker quotes obtained and transfers into (if any) Level 3 are due to a decrease in the quantity and reliability of broker quotes obtained as assessed by the Adviser. Transfers are assumed to have occurred at the end of the period. There were no transfers between Level 1 and Level 2 fair value measurements during the periods shown.
[4] Transfers out (if any) of Level 3 are due to an increase in the quantity and reliability of broker quotes obtained and transfers into (if any) Level 3 are due to a decrease in the quantity and reliability of broker quotes obtained as assessed by the Adviser. Transfers are assumed to have occurred at the end of the period. There were no transfers between Level 1 and Level 2 fair value measurements during the periods shown.
[5] Includes unfunded commitments measured at fair value of $(60,123).
[6] Includes unfunded commitments measured at fair value of $(19,249).