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Fair Value - Unobservable Inputs (Details)
$ in Thousands
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 3,000,696 [1] $ 3,091,024 [2]
Level III    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 2,920,263 2,987,078
Level III | First lien | Market & income approach    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 1,891,810 $ 1,884,611
Level III | First lien | Market & income approach | EBITDA multiple | Low    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 6.0 6.0
Level III | First lien | Market & income approach | EBITDA multiple | High    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 36.0 35.0
Level III | First lien | Market & income approach | EBITDA multiple | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 15.1 14.8
Level III | First lien | Market & income approach | Revenue multiple | Low    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 5.0 3.0
Level III | First lien | Market & income approach | Revenue multiple | High    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 19.5 19.5
Level III | First lien | Market & income approach | Revenue multiple | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 9.2 6.9
Level III | First lien | Market & income approach | Discount rate | Low    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.064 0.068
Level III | First lien | Market & income approach | Discount rate | High    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.231 0.221
Level III | First lien | Market & income approach | Discount rate | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.092 0.098
Level III | First lien | Other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 35,556 $ 17,999
Level III | Second lien | Market & income approach    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 117,872 $ 144,003
Level III | Second lien | Market & income approach | EBITDA multiple | Low    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 8.0 7.0
Level III | Second lien | Market & income approach | EBITDA multiple | High    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 20.0 20.0
Level III | Second lien | Market & income approach | EBITDA multiple | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 17.2 15.2
Level III | Second lien | Market & income approach | Discount rate | Low    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.090 0.101
Level III | Second lien | Market & income approach | Discount rate | High    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.140 0.206
Level III | Second lien | Market & income approach | Discount rate | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.108 0.122
Level III | Second lien | Other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 10,751 $ 6,331
Level III | Subordinated | Market & income approach    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 107,986 $ 102,034
Level III | Subordinated | Market & income approach | EBITDA multiple | Low    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 8.0 8.0
Level III | Subordinated | Market & income approach | EBITDA multiple | High    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 24.5 21.0
Level III | Subordinated | Market & income approach | EBITDA multiple | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 15.8 15.4
Level III | Subordinated | Market & income approach | Discount rate | Low    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.124 0.125
Level III | Subordinated | Market & income approach | Discount rate | High    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.323 0.259
Level III | Subordinated | Market & income approach | Discount rate | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.181 0.168
Level III | Structured Finance Obligations | Income Approach    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 3,249  
Level III | Structured Finance Obligations | Income Approach | Discount rate | Low    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.113  
Level III | Structured Finance Obligations | Income Approach | Discount rate | High    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.113  
Level III | Structured Finance Obligations | Income Approach | Discount rate | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.113  
Level III | Equity and other | Market & income approach    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 359,029 $ 422,851
Level III | Equity and other | Market & income approach | EBITDA multiple | Low    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 6.0 5.5
Level III | Equity and other | Market & income approach | EBITDA multiple | High    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 21.5 26.5
Level III | Equity and other | Market & income approach | EBITDA multiple | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 12.0 12.8
Level III | Equity and other | Market & income approach | Revenue multiple | Low    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 5.0 9.0
Level III | Equity and other | Market & income approach | Revenue multiple | High    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 9.8 19.5
Level III | Equity and other | Market & income approach | Revenue multiple | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 6.1 14.1
Level III | Equity and other | Market & income approach | Discount rate | Low    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.097 0.082
Level III | Equity and other | Market & income approach | Discount rate | High    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.180 0.446
Level III | Equity and other | Market & income approach | Discount rate | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.117 0.089
Level III | Equity and other | Other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 7,370 $ 22,055
Level III | Equity and other | Income Approach    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 386,640 $ 387,194
Level III | Equity and other | Income Approach | Discount rate | Low    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.063 0.064
Level III | Equity and other | Income Approach | Discount rate | High    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.122 0.122
Level III | Equity and other | Income Approach | Discount rate | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.099 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.