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N-2 - $ / shares | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Cover [Abstract] |  |  |  |
Entity Central Index Key | 0001496099 |  |  |
Amendment Flag | false |  |  |
Securities Act File Number | 814-00832 |  |  |
Document Type | 10-Q |  |  |
Entity Registrant Name | New Mountain Finance Corporation |  |  |
Entity Address, Address Line One | 1633 Broadway, 48th Floor |  |  |
Entity Address, City or Town | New York |  |  |
Entity Address, State or Province | NY |  |  |
Entity Address, Postal Zip Code | 10019 |  |  |
City Area Code | 212 |  |  |
Local Phone Number | 720-0300 |  |  |
Entity Emerging Growth Company | false |  |  |
General Description of Registrant [Abstract] |  |  |  |
Investment Objectives and Practices [Text Block] | We are a leading BDC focused on providing direct lending solutions to U.S. upper middle market companies backed by top private equity sponsors. Our investment objective is to generate current income and capital appreciation through the sourcing and origination of senior secured loans and select junior capital positions, to growing businesses in defensive industries that offer attractive risk-adjusted returns. Our differentiated investment approach leverages the deep sector knowledge and operating resources of New Mountain Capital. Senior secured loans may include traditional first lien loans or unitranche loans. We invest a significant portion of our portfolio in unitranche loans, which are loans that combine both senior and subordinated debt, generally in a first-lien position. Because unitranche loans combine characteristics of senior and subordinated debt, they have risks similar to the risks associated with secured debt and subordinated debt. Certain unitranche loan investments may include “last-out” positions, which generally heighten the risk of loss. In some cases, our investments may also include equity interests. We primarily invest in senior secured debt of U.S. sponsor-backed, middle market companies. We define middle market companies as those with annual earnings before interest, taxes, depreciation, and amortization ("EBITDA") of $10 million to $200 million. Our focus is on defensive growth businesses that generally exhibit the following characteristics: (i) acyclicality, (ii) sustainable secular growth drivers, (iii) niche market dominance and high barriers to competitive entry, (iv) recurring revenue and strong free cash flow, (v) flexible cost structures and (vi) seasoned management teams. Similar to us, the investment objective of each of SBIC I, SBIC II and SBIC III, is to generate current income and capital appreciation under the investment criteria we use. However, SBIC I, SBIC II and SBIC III investments must be in SBA eligible small businesses. Our portfolio may be concentrated in a limited number of industries. As of June 30, 2025, our top five industry concentrations were software, business services, healthcare, investment funds (which includes our investments in our joint ventures) and consumer services. |  |  |
Risk [Text Block] | In addition to the other information set forth in this report, you should carefully consider the factors discussed in Item 1A. Risk Factors in our Annual Report on Form 10-K for the fiscal year ended December 31, 2024, which could materially affect our business, financial condition and/or operating results, including the Risk Factor titled "Small Business Credit Availability Act allows us to incur additional leverage, which could increase the risk of investing in our securities". The risks described in our Annual Report on Form 10-K are not the only risks we face. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially and adversely affect our business, financial condition and/or operating results. There have been no material changes during the six months ended June 30, 2025 to the risk factors discussed in Item 1A. Risk Factors in our Annual Report on Form 10-K for the year ended December 31, 2024. |  |  |
NAV Per Share | $ 12.21 | $ 12.55 | $ 12.74 | $ 12.87

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