| Document and Entity Information | Sep. 01, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Sep. 1, 2021 |
| Entity Registrant Name | ENPRO INDUSTRIES, INC. |
| Entity Central Index Key | 0001164863 |
| Amendment Flag | false |
| Entity Incorporation, State or Country Code | NC |
| Entity File Number | 001-31225 |
| Entity Tax Identification Number | 01-0573945 |
| Entity Address, Address Line One | 5605 Carnegie Boulevard, Suite 500 |
| Entity Address, City or Town | Charlotte |
| Entity Address, State or Province | NC |
| Entity Address, Postal Zip Code | 28209 |
| City Area Code | 704 |
| Local Phone Number | 731-1500 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock, $0.01 par value |
| Trading Symbol | NPO |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
