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Investments - Investment Cost and Fair Value by Type and by Industry (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Cost $ 3,097,390 [1] $ 3,101,924 [2]
Fair Value 3,000,696 [1] 3,091,024 [2]
Software    
Schedule of Investments [Line Items]    
Cost 816,749 857,673
Fair Value 809,705 848,086
Business Services    
Schedule of Investments [Line Items]    
Cost 567,179 508,536
Fair Value 511,578 497,954
Healthcare    
Schedule of Investments [Line Items]    
Cost 487,991 513,429
Fair Value 461,828 501,850
Investment Funds (includes investments in joint ventures)    
Schedule of Investments [Line Items]    
Cost 275,632 275,632
Fair Value 275,649 275,632
Consumer Services    
Schedule of Investments [Line Items]    
Cost 188,990 192,052
Fair Value 188,407 192,340
Education    
Schedule of Investments [Line Items]    
Cost 205,107 205,283
Fair Value 174,483 187,620
Financial Services    
Schedule of Investments [Line Items]    
Cost 127,999 120,505
Fair Value 133,282 125,750
Distribution & Logistics    
Schedule of Investments [Line Items]    
Cost 121,246 119,947
Fair Value 118,823 120,493
Net Lease    
Schedule of Investments [Line Items]    
Cost 81,370 81,370
Fair Value 114,240 114,794
Packaging    
Schedule of Investments [Line Items]    
Cost 69,179 68,200
Fair Value 70,934 68,093
Energy    
Schedule of Investments [Line Items]    
Cost 72,775 68,114
Fair Value 64,837 65,076
Business Products    
Schedule of Investments [Line Items]    
Cost 30,454 22,185
Fair Value 30,654 22,387
Food & Beverage    
Schedule of Investments [Line Items]    
Cost 21,286 38,840
Fair Value 21,284 42,450
Consumer Products    
Schedule of Investments [Line Items]    
Cost 21,868 20,769
Fair Value 15,377 19,101
Specialty Chemicals & Materials    
Schedule of Investments [Line Items]    
Cost 9,565 9,389
Fair Value 9,615 9,398
First lien    
Schedule of Investments [Line Items]    
Cost 1,993,735 1,970,251
Fair Value 1,967,323 1,956,608
Second lien    
Schedule of Investments [Line Items]    
Cost 181,428 211,449
Fair Value 169,099 197,050
Subordinated    
Schedule of Investments [Line Items]    
Cost 119,968 113,928
Fair Value 107,986 102,034
Structured Finance Obligations    
Schedule of Investments [Line Items]    
Cost 3,232 3,232
Fair Value 3,249 3,232
Equity and other    
Schedule of Investments [Line Items]    
Cost 799,027 803,064
Fair Value $ 753,039 $ 832,100
[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.