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Investments - NMFC Senior Loan Program III LLC (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended 13 Months Ended
Aug. 06, 2025
Sep. 30, 2025
USD ($)
investment
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
investment
Sep. 30, 2024
USD ($)
Jul. 02, 2024
Aug. 05, 2025
Dec. 31, 2024
USD ($)
investment
Schedule of Investments [Line Items]                
Cost   $ 3,062,321 [1]   $ 3,062,321 [1]       $ 3,101,924 [2]
Investments at fair value   2,943,619 [1]   2,943,619 [1]       3,091,024 [2]
Interest and dividend receivable   44,169   44,169       42,379
SLP III                
Schedule of Investments [Line Items]                
Cost   160,000   160,000        
Dividend income   5,600 $ 5,567 17,000 $ 17,205      
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 additional period       1 year        
Cost   768,974   $ 768,974       716,654
Investments at fair value   $ 757,977   $ 757,977       $ 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               $ 2,654
SLP III | Revolving Credit Facility                
Schedule of Investments [Line Items]                
Credit facility   $ 524,700   $ 524,700       $ 511,200
SLP III | Revolving Credit Facility | Line of Credit                
Schedule of Investments [Line Items]                
Maximum borrowing capacity   941,000   941,000        
SLP III | Revolving Credit Facility | Line Of Credit, Class A Advance                
Schedule of Investments [Line Items]                
Maximum borrowing capacity   830,000   830,000        
SLP III | Revolving Credit Facility | Line Of Credit, Class B Advance                
Schedule of Investments [Line Items]                
Maximum borrowing capacity   $ 111,000   $ 111,000        
SLP III | During Reinvestment Period | Revolving Credit Facility | Line of Credit                
Schedule of Investments [Line Items]                
Interest rate margin           1.80% 1.65%  
SLP III | During Reinvestment Period | Revolving Credit Facility | Line Of Credit, Class A Advance                
Schedule of Investments [Line Items]                
Interest rate margin 1.50%              
SLP III | During Reinvestment Period | Revolving Credit Facility | Line Of Credit, Class B Advance                
Schedule of Investments [Line Items]                
Interest rate margin 4.75%              
SLP III | After Reinvestment Period | Revolving Credit Facility | Line of Credit                
Schedule of Investments [Line Items]                
Interest rate margin           2.10% 1.95%  
SLP III | After Reinvestment Period | Revolving Credit Facility | Line Of Credit, Class A Advance                
Schedule of Investments [Line Items]                
Interest rate margin 1.80%              
SLP III | After Reinvestment Period | Revolving Credit Facility | Line Of Credit, Class B Advance                
Schedule of Investments [Line Items]                
Interest rate margin 5.05%              
[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.