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N-2 - $ / shares | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 2021
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, defined by annual 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, SBIC I's and SBIC II's investment objectives are to generate current income and capital appreciation under the investment criteria we use. However, SBIC I and SBIC II investments must be in SBA eligible small businesses. Our portfolio may be concentrated in a limited number of industries. As of September 30, 2023, our top five industry concentrations were software, business services, healthcare, investment funds (which includes our investments in our joint ventures) and education. |  |  |
NAV Per Share | $ 13.06 | $ 13.02 | $ 13.20 | $ 13.49
Strain On Banking System Risk [Member] |  |  |  |
General Description of Registrant [Abstract] |  |  |  |
Risk Factors [Table Text Block] | Our business is dependent on bank relationships and recent strain on the banking system may adversely impact us. The financial markets recently have encountered volatility associated with concerns about the balance sheets of banks, especially small and regional banks that may have significant losses associated with investments that make it difficult to fund demands to withdraw deposits and other liquidity needs. Although the federal government has announced measures to assist these banks and protect depositors, some banks have already been impacted and others may be materially and adversely impacted. Our business is dependent on bank relationships, and we are proactively monitoring the financial health of banks with which we (or our portfolio companies) do or may in the future do business. Continued strain on the banking system may adversely impact our business, financial condition and results of operations. |  |  |
Covenant-Lite Loans Risk [Member] |  |  |  |
General Description of Registrant [Abstract] |  |  |  |
Risk Factors [Table Text Block] | Covenant-lite loans may offer us fewer protections than traditional investments. Some of our debt investments may have less restrictive covenant terms that provide us with fewer protections, called "covenant-lite" loans, that generally provide for fewer financial covenants on the borrower. In particular, borrowers under such covenant-lite loans may have greater flexibility in how they manage their financial condition. As a result, we may face challenges in recovering on such covenant-lite loans, to the extent they go into distress, and may lack options that would normally be available to us as a lender under more traditional debt structures. |  |  |
Reference Rates Yield Risk [Member] |  |  |  |
General Description of Registrant [Abstract] |  |  |  |
Risk Factors [Table Text Block] | The alternative reference rates that have replaced LIBOR in our credit arrangements and other financial instruments may not yield the same or similar economic results as LIBOR over the life of such transactions. LIBOR, the London Interbank Offered Rate, is an index rate that historically was widely used in lending transactions and was a common reference rate for setting the floating interest rate on private loans. LIBOR was typically the reference rate used in floating-rate loans extended to our portfolio companies. The ICE Benchmark Administration (“IBA”) (the entity that is responsible for calculating LIBOR) ceased providing overnight, one, three, six and twelve months USD LIBOR tenors on June 30, 2023. In addition, the United Kingdom’s Financial Conduct Authority (“FCA”), which oversees the IBA, now prohibits entities supervised by the FCA from using LIBORs, including USD LIBOR, except in very limited circumstances. In the United States, the Secured Overnight Financing Rate (“SOFR”) is the preferred alternative rate for LIBOR. SOFR is a measure of the cost of borrowing cash overnight, collateralized by U.S. Treasury securities, and is based on directly observable U.S. Treasury-backed repurchase transactions. SOFR is published by the Federal Reserve Bank of New York each U.S. Government Securities Business Day, for transactions made on the immediately preceding US. Government Securities Business Day. Alternative reference rates that may replace LIBOR, including SOFR for USD transactions, may not yield the same or similar economic results as LIBOR over the lives of such transactions. Substantially all of our loans that referenced LIBOR have been amended to reference the forward-looking term rate published by CME Group Benchmark Administration Limited based on the secured overnight financing rate (“CME Term SOFR”). CME Term SOFR rates are forward-looking rates that are derived by compounding projected overnight SOFR rates over one, three, and six months taking into account the values of multiple consecutive, executed, one-month and three-month CME Group traded SOFR futures contracts and, in some cases, over-the-counter SOFR Overnight Indexed Swaps as an indicator of CME Term SOFR reference rate values. CME Term SOFR and the inputs on which it is based are derived from SOFR. Since CME Term SOFR is a relatively new market rate, there will likely be no established trading market for credit agreements or other financial instruments when they are issued, and an established market may never develop or may not be liquid. Market terms for instruments referencing CME Term SOFR rates may be lower than those of later-issued CME Term SOFR indexed instruments. Similarly, if CME Term SOFR does not prove to be widely used, the trading price of instruments referencing CME Term SOFR may be lower than those of instruments indexed to indices that are more widely used. |  |  |

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