| Cover Page | Nov. 02, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Nov. 2, 2020 |
| Entity Registrant Name | FMC CORPORATION |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 1-2376 |
| Entity Tax Identification Number | 94-0479804 |
| Entity Address, Address Line One | 2929 Walnut Street |
| Entity Address, City or Town | Philadelphia |
| Entity Address, State or Province | PA |
| Entity Address, Postal Zip Code | 19104 |
| City Area Code | 215 |
| Local Phone Number | 299-6000 |
| Title of 12(b) Security | Common Stock, par value $0.10 per share |
| Trading Symbol | FMC |
| 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 | 0000037785 |
| Amendment Flag | false |
