v3.26.3
Investment Portfolio Financing Arrangements - Schedule of Information Related to Secured Credit Agreements (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Feb. 22, 2022
Sep. 30, 2026
Dec. 31, 2025
May 12, 2026
Nov. 07, 2025
Debt Instrument [Line Items]          
Balance outstanding   $ 4,198,054      
Secured Credit Agreements and Secured Credit Facilities          
Debt Instrument [Line Items]          
Commitment amount   2,300,000 $ 1,700,000    
Maximum current availability   777,844 1,108,755    
Balance outstanding   1,522,156 591,245    
Principal balance of collateral   2,132,371 785,701    
Amortized cost of collateral   2,124,672 782,603    
Secured Revolving Credit Facility          
Debt Instrument [Line Items]          
Balance outstanding   $ 1,522,156 $ 591,245    
Recourse guarantee percentage   25.00%      
Holdco          
Debt Instrument [Line Items]          
Recourse guarantee percentage 100.00%        
Holdco | Secured Revolving Credit Facility          
Debt Instrument [Line Items]          
Recourse guarantee percentage   25.00% 25.00%    
Goldman Sachs | Debt Instrument Interest Rate At 7.5% | Secured Credit Agreements and Secured Credit Facilities          
Debt Instrument [Line Items]          
Wtd. avg. credit spread   1.80% 1.80%    
Wtd. avg. interest rate   5.70% 5.50%    
Commitment amount   $ 750,000 $ 500,000    
Maximum current availability   165,815 130,233    
Balance outstanding   584,185 369,767    
Principal balance of collateral   781,103 499,717    
Amortized cost of collateral   $ 777,145 $ 498,501    
Term out period         2 years
Wells Fargo | Debt Instrument Interest Rate At 7.0% | Secured Credit Agreements and Secured Credit Facilities          
Debt Instrument [Line Items]          
Wtd. avg. credit spread   1.50% 1.60%    
Wtd. avg. interest rate   5.50% 5.30%    
Commitment amount   $ 850,000 $ 500,000 $ 850,000  
Maximum current availability   216,250 423,913    
Balance outstanding   633,750 76,087    
Principal balance of collateral   963,402 104,245    
Amortized cost of collateral   $ 960,977 $ 103,296    
Period following amendment not subject to margin calls       1 year  
Citi | Debt Instrument Interest Rate At 6.9% | Secured Credit Agreements and Secured Credit Facilities          
Debt Instrument [Line Items]          
Wtd. avg. credit spread   1.40%      
Wtd. avg. interest rate   5.30%      
Commitment amount   $ 500,000      
Maximum current availability   341,170      
Balance outstanding   158,830      
Principal balance of collateral   200,923      
Amortized cost of collateral   $ 200,303      
Barclays | Debt Instrument Interest Rate At 6.9% | Secured Credit Agreements and Secured Credit Facilities          
Debt Instrument [Line Items]          
Wtd. avg. credit spread     0.00%    
Wtd. avg. interest rate     0.00%    
Commitment amount     $ 500,000    
Maximum current availability     500,000    
Balance outstanding     0    
Principal balance of collateral     0    
Amortized cost of collateral     $ 0    
Bank of America | Debt Instrument, Interest Rate at 7.1% | Secured Credit Agreements and Secured Credit Facilities          
Debt Instrument [Line Items]          
Wtd. avg. credit spread   1.40% 1.40%    
Wtd. avg. interest rate   5.30% 5.10%    
Commitment amount   $ 200,000 $ 200,000    
Maximum current availability   54,609 54,609    
Balance outstanding   145,391 145,391    
Principal balance of collateral   186,943 181,739    
Amortized cost of collateral   $ 186,247 $ 180,806