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Fair Value - Schedule of Unobservable Inputs Used in the Fair Value Measurement (Details)
$ in Thousands
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 2,943,619 [1] $ 3,091,024 [2]
Level III    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 2,842,734 2,987,078
Level III | First lien | Market & income approach    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 1,824,381 $ 1,884,611
Level III | First lien | Market & income approach | Low | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 6.0 6.0
Level III | First lien | Market & income approach | Low | Revenue multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 4.0 3.0
Level III | First lien | Market & income approach | Low | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.057 0.068
Level III | First lien | Market & income approach | High | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 25.0 35.0
Level III | First lien | Market & income approach | High | Revenue multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 19.5 19.5
Level III | First lien | Market & income approach | High | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.152 0.221
Level III | First lien | Market & income approach | Weighted Average | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 14.2 14.8
Level III | First lien | Market & income approach | Weighted Average | Revenue multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 10.1 6.9
Level III | First lien | Market & income approach | Weighted Average | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.086 0.098
Level III | First lien | Other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 63,996 $ 17,999
Level III | Second lien | Market & income approach    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 98,128 $ 144,003
Level III | Second lien | Market & income approach | Low | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 7.0 7.0
Level III | Second lien | Market & income approach | Low | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.093 0.101
Level III | Second lien | Market & income approach | High | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 21.0 20.0
Level III | Second lien | Market & income approach | High | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.168 0.206
Level III | Second lien | Market & income approach | Weighted Average | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 20.0 15.2
Level III | Second lien | Market & income approach | Weighted Average | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.122 0.122
Level III | Second lien | Other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value   $ 6,331
Level III | Subordinated | Market & income approach    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 111,031 $ 102,034
Level III | Subordinated | Market & income approach | Low | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 8.0 8.0
Level III | Subordinated | Market & income approach | Low | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.120 0.125
Level III | Subordinated | Market & income approach | High | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 20.0 21.0
Level III | Subordinated | Market & income approach | High | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.269 0.259
Level III | Subordinated | Market & income approach | Weighted Average | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 14.5 15.4
Level III | Subordinated | Market & income approach | Weighted Average | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.171 0.168
Level III | Structured Finance Obligations | Income Approach    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 3,257  
Level III | Structured Finance Obligations | Income Approach | Low | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.109  
Level III | Structured Finance Obligations | Income Approach | High | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.109  
Level III | Structured Finance Obligations | Income Approach | Weighted Average | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.109  
Level III | Equity and other | Market & income approach    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 347,229 $ 422,851
Level III | Equity and other | Market & income approach | Low | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 5.5 5.5
Level III | Equity and other | Market & income approach | Low | Revenue multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 9.0 9.0
Level III | Equity and other | Market & income approach | Low | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.087 0.082
Level III | Equity and other | Market & income approach | High | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 23.0 26.5
Level III | Equity and other | Market & income approach | High | Revenue multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 9.0 19.5
Level III | Equity and other | Market & income approach | High | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.191 0.446
Level III | Equity and other | Market & income approach | Weighted Average | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 11.8 12.8
Level III | Equity and other | Market & income approach | Weighted Average | Revenue multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 9.0 14.1
Level III | Equity and other | Market & income approach | Weighted Average | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.115 0.089
Level III | Equity and other | Other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 7,368 $ 22,055
Level III | Equity and other | Income Approach    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 387,344 $ 387,194
Level III | Equity and other | Income Approach | Low | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.063 0.064
Level III | Equity and other | Income Approach | High | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.157 0.122
Level III | Equity and other | Income Approach | Weighted Average | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.114 0.099
[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.