Cover - shares
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3 Months Ended |
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Mar. 31, 2023 |
May 08, 2023 |
| Cover [Abstract] |
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| Document Type |
10-Q
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| Document Quarterly Report |
true
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| Document Period End Date |
Mar. 31, 2023
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| Document Transition Report |
false
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| Entity File Number |
814-00832
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| Entity Registrant Name |
New Mountain Finance Corporation
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| Entity Tax Identification Number |
27-2978010
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| Entity Address, Address Line One |
1633 Broadway, 48th Floor
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| Entity Address, City or Town |
New York
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| Entity Address, State or Province |
NY
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| Entity Address, Postal Zip Code |
10019
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| City Area Code |
212
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| Local Phone Number |
720-0300
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| Entity Incorporation, State or Country Code |
DE
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| Title of 12(b) Security |
Common stock, par value $0.01 per share
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| Trading Symbol |
NMFC
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| Security Exchange Name |
NASDAQ
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| Entity Current Reporting Status |
Yes
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| Entity Interactive Data Current |
Yes
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| Entity Filer Category |
Large Accelerated Filer
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| Entity Small Business |
false
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| Entity Emerging Growth Company |
false
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| Entity Shell Company |
false
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| Entity Common Stock, Shares Outstanding |
|
100,937,026
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| Entity Central Index Key |
0001496099
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| Amendment Flag |
false
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| Current Fiscal Year End Date |
--12-31
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| Document Fiscal Year Focus |
2023
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| Document Fiscal Period Focus |
Q1
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