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Summary of Significant Accounting Policies - Narrative (Details)
 3 Months Ended 6 Months Ended 11 Months Ended
Mar. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2024
USD ($)
numberOfAgreement
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
numberOfAgreement
Jun. 30, 2023
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2023
USD ($)
numberOfAgreement
Feb. 04, 2016
USD ($)
Securities Financing Transaction [Line Items]                
Number of collateralized agreements | numberOfAgreement   1   1     1  
Securities purchased under collateralized agreements to resell, cost   $ 30,000,000   $ 30,000,000     $ 30,000,000  
Securities purchased under agreements to resell   13,500,000   13,500,000     16,500,000  
Cash equivalents   0   0     0  
PIK interest income   9,031,000 $ 7,867,000 18,685,000 $ 16,890,000      
Non-cash dividend income   $ 7,741,000 6,736,000 $ 15,165,000 13,237,000      
Investments threshold period past due for nonaccrual status   30 days   30 days        
Deferred tax liability   $ 63,000   $ 63,000     0  
Deferred tax asset   $ 0   $ 0     $ 594,000  
Dividend reinvestment plan, share price percentage, threshold   110.00%   110.00%        
Investments in Majority-owned Subsidiaries                
Securities Financing Transaction [Line Items]                
Shares redeemed for a promissory note (in shares) | shares 105,030              
Redemption of shares paid-in-kind $ 11,315,000              
Interest rate 7.00%              
Common Stock                
Securities Financing Transaction [Line Items]                
Stock repurchase program, authorized amount               $ 50,000,000
Common stock repurchased   $ 0 $ 0 $ 0 $ 0 $ 2,948,000    
Common Stock | New Mountain Net Lease Corporation                
Securities Financing Transaction [Line Items]                
Sale of stock, number of shares issued (in shares) | shares 105,030              
Sale of stock, price per share (in dollars per share) | $ / shares $ 107.73              
Sale of stock, consideration received $ 11,315,000