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Investments - NMFC Senior Loan Program III LLC (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 03, 2024
Jul. 03, 2023
Jun. 30, 2025
USD ($)
investment
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
investment
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
investment
Schedule of Investments [Line Items]              
Cost     $ 3,097,390 [1]   $ 3,097,390 [1]   $ 3,101,924 [2]
Investments at fair value     3,000,696 [1]   3,000,696 [1]   3,091,024 [2]
Interest and dividend receivable     43,156   43,156   42,379
SLP III              
Schedule of Investments [Line Items]              
Cost     160,000   160,000    
Dividend income     5,600 $ 5,775 11,400 $ 11,638  
Interest and dividend receivable     5,600   5,600   6,100
SLP III | SkyKnight II              
Schedule of Investments [Line Items]              
Cost     40,000   $ 40,000    
SLP III              
Schedule of Investments [Line Items]              
Investment period         5 years    
Investment extension period         1 year    
Cost     711,282   $ 711,282   716,654
Investments at fair value     $ 701,407   $ 701,407   $ 715,096
Number of investments on non-accrual | investment     0   0   0
SLP III | Delayed Draw Term Loan (DDTL)              
Schedule of Investments [Line Items]              
Unfunded commitments principal amount     $ 5,211   $ 5,211   $ 2,654
SLP III | Revolving Credit Facility              
Schedule of Investments [Line Items]              
Credit facility     511,200   511,200   $ 511,200
SLP III | Revolving Credit Facility | Credit Facility              
Schedule of Investments [Line Items]              
Maximum borrowing capacity     $ 600,000   $ 600,000    
SLP III | During Reinvestment Period | Revolving Credit Facility | Credit Facility              
Schedule of Investments [Line Items]              
Interest rate margin 1.65% 1.80%          
SLP III | After Reinvestment Period | Revolving Credit Facility | Credit Facility              
Schedule of Investments [Line Items]              
Interest rate margin 1.95% 2.10%          
[1] New Mountain Finance Corporation (the "Company") generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the "Securities Act"). These investments are generally subject to certain limitations on resale, and may be deemed to be "restricted securities" under the Securities Act.
[2] New Mountain Finance Corporation (the "Company") generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the "Securities Act"). These investments are generally subject to certain limitations on resale, and may be deemed to be "restricted securities" under the Securities Act.