Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2019	Jun. 30, 2019
Cover page.
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	1-2376
Entity Registrant Name	FMC CORPORATION
Entity Incorporation, State or Country Code	DE
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
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float		$ 10,748,748,353
Entity Common Stock, Shares Outstanding	129,124,294
Entity Central Index Key	0000037785
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false