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Investments - NMFC Senior Loan Program IV LLC (Details)
$ in Thousands
 3 Months Ended 11 Months Ended
Dec. 20, 2024
Mar. 27, 2024
Mar. 31, 2025
USD ($)
investment
Mar. 31, 2024
USD ($)
Mar. 27, 2024
Dec. 31, 2024
USD ($)
investment
May 05, 2021
USD ($)
Schedule of Investments [Line Items]              
Cost     $ 3,092,943     $ 3,101,924  
Investments at fair value     3,034,211     3,091,024  
Interest and dividend receivable     41,239     42,379  
SLP IV              
Schedule of Investments [Line Items]              
Cost     112,400        
Dividend income     3,934 $ 4,356      
Interest and dividend receivable     3,934     4,075  
SLP IV | SkyKnight Alpha              
Schedule of Investments [Line Items]              
Cost     $ 30,600        
SLP IV              
Schedule of Investments [Line Items]              
Investment period     5 years        
Cost     $ 460,308     474,738  
Investments at fair value     $ 451,133     $ 469,326  
Number of investments on non-accrual | investment     0     0  
SLP IV | Delayed Draw Term Loan (DDTL)              
Schedule of Investments [Line Items]              
Unfunded commitments principal amount     $ 2,772     $ 1,212  
SLP IV | Revolving Credit Facility              
Schedule of Investments [Line Items]              
Credit facility     $ 323,437     $ 334,437  
SLP IV | Revolving Credit Facility | Credit Facility              
Schedule of Investments [Line Items]              
Maximum borrowing capacity             $ 370,000
Interest rate margin 1.50% 1.90%     1.70%