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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Line of Credit Facility [Line Items]    
Investment aggregate capitalization 5.00%  
Investments aggregating capitalization valuations of percentage 5.00%  
Minimum aggregate percentage of assets required for applicability of foregoing investment policies 5.00%  
Restricted cash $ 0 $ 0
Percentage of foreign currency denominated investments 0.004 0.004
Fair Value $ 1,533,302,472 $ 1,794,758,336
Cash and cash equivalents 61,075,494 91,589,702
Income Approach | Five Senior Debt    
Line of Credit Facility [Line Items]    
Fair Value 37,900,000  
Income Approach | One Senior Debt    
Line of Credit Facility [Line Items]    
Fair Value 7,600,000  
Income Approach | Two Equity Positions    
Line of Credit Facility [Line Items]    
Fair Value 15,900,000  
Valuation Technique, Consensus Pricing Model | One Senior Debt    
Line of Credit Facility [Line Items]    
Fair Value 5,600,000  
Paid in Capital in Excess of Par    
Line of Credit Facility [Line Items]    
Paid-in capital 2,252,164 487,501,546
Distributable earnings (loss)    
Line of Credit Facility [Line Items]    
Accumulated Earnings (Loss) (2,252,164) (487,501,546)
BlackRock Capital Investment Corporation    
Line of Credit Facility [Line Items]    
Reclassification between accumulated earnings and paid-in-capital including merger   488,077,104
Interest Rate Swap    
Line of Credit Facility [Line Items]    
Notional amount of interest rate swap $ 35,000,000  
Fixed interest rate 2.633%  
Debt Investments    
Line of Credit Facility [Line Items]    
Fair Value $ 1,418,443,590 [1] 1,642,572,999 [2],[3]
JPMorgan U.S. Government Money Market Fund    
Line of Credit Facility [Line Items]    
Cash and cash equivalents $ 3,800,000  
Percentage of cash and cash equivalents net assets held 0.60%  
Yield percentage of cash equivalents 3.66%  
JPMorgan U.S. Treasury Plus Money Market Fund    
Line of Credit Facility [Line Items]    
Cash and cash equivalents   $ 1,400,000
Percentage of cash and cash equivalents net assets held   0.20%
Yield percentage of cash equivalents   4.42%
Allspring Government Money Market Fund    
Line of Credit Facility [Line Items]    
Cash and cash equivalents $ 47,600,000 $ 59,200,000
Percentage of cash and cash equivalents net assets held 8.00% 7.50%
Yield percentage of cash equivalents 3.65% 4.36%
[1] Debt investments include investments in bank debt that generally are bought and sold among institutional investors in transactions not subject to registration under the Securities Act of 1933 (the “Securities Act”). Such transactions are generally subject to contractual restrictions, such as approval of the agent or borrower.
[2] Debt investments include investments in bank debt that generally are bought and sold among institutional investors in transactions not subject to registration under the Securities Act. Such transactions are generally subject to contractual restrictions, such as approval of the agent or borrower.
[3] Inputs in the valuation of this investment included certain unobservable inputs that were significant to the valuation as a whole.