| Cover Document | Aug. 20, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Jan. 19, 2021 |
| Entity Registrant Name | SPX FLOW, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 1-37393 |
| Entity Tax Identification Number | 47-3110748 |
| Entity Address, Address Line One | 13320 Ballantyne Corporate Place |
| Entity Address, City or Town | Charlotte |
| Entity Address, State or Province | NC |
| Entity Address, Postal Zip Code | 28277 |
| City Area Code | 704 |
| Local Phone Number | 752-4400 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, Par Value $0.01 |
| Trading Symbol | FLOW |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001641991 |
