Cover
|
Dec. 08, 2023 |
| Document Information [Line Items] |
|
| Document Type |
8-K
|
| Amendment Flag |
false
|
| Document Period End Date |
Dec. 08, 2023
|
| Entity File Number |
814-00832
|
| Entity Registrant Name |
New Mountain Finance Corporation
|
| Entity Central Index Key |
0001496099
|
| Entity Tax Identification Number |
27-2978010
|
| Entity Incorporation, State or Country Code |
DE
|
| Entity Address, Address Line One |
1633 Broadway
|
| Entity Address, Address Line Two |
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
|
| Written Communications |
false
|
| Soliciting Material |
false
|
| Pre-commencement Tender Offer |
false
|
| Pre-commencement Issuer Tender Offer |
false
|
| Entity Emerging Growth Company |
false
|
| Common Stock [Member] |
|
| Document Information [Line Items] |
|
| Title of 12(b) Security |
Common stock, par value $0.01 per share
|
| Trading Symbol |
NMFC
|
| Security Exchange Name |
NASDAQ
|
| 8.250% Notes due 2028 [Member] |
|
| Document Information [Line Items] |
|
| Title of 12(b) Security |
8.250% Notes due 2028
|
| Trading Symbol |
NMFCZ
|
| Security Exchange Name |
NASDAQ
|