Revenue Recognition - Disaggregation of Revenue by Major Geographical Region (Details)	3 Months Ended
	Mar. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 1,210,700,000.0
FMC Agricultural Solutions
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,107,900,000.0
FMC Agricultural Solutions | North America
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	298,200,000
FMC Agricultural Solutions | Latin America
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	158,900,000
FMC Agricultural Solutions | Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	398,800,000
FMC Agricultural Solutions | Asia
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	252,000,000
FMC Lithium
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	102,800,000.0
FMC Lithium | North America
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	19,900,000
FMC Lithium | Latin America
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	700,000
FMC Lithium | Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	17,500,000
FMC Lithium | Asia
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 64,700,000