| Document and Entity Information | Jul. 05, 2022 |
| Cover [Abstract] | |
| Entity Registrant Name | Neenah Inc |
| Amendment Flag | false |
| Entity Central Index Key | 0001296435 |
| Current Fiscal Year End Date | --12-31 |
| Document Type | 8-K |
| Document Period End Date | Jul. 05, 2022 |
| Entity Incorporation State 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, Address Line Two | Suite 600 |
| 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 |
| Written Communications | true |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.01 par value |
| Trading Symbol | NP |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
