| Cover Page | Mar. 01, 2021 |
| Cover page. [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Mar. 1, 2021 |
| Entity Registrant Name | NEENAH INC |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-32240 |
| Entity Tax Identification Number | 20-1308307 |
| Entity Address, Address Line One | 3460 Preston Ridge Road |
| Entity Address, City or Town | Alpharetta |
| Entity Address, State or Province | GA |
| Entity Address, Postal Zip Code | 30005 |
| City Area Code | 678 |
| Local Phone Number | 566-6500 |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | NP |
| Security Exchange Name | NYSE |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001296435 |
| Amendment Flag | false |
