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Revenue Recognition - Disaggregation of Revenue By Major Product Category (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers $ 1,035.6 $ 3,508.6
FMC Agricultural Solutions    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 923.6 3,185.9
FMC Agricultural Solutions | Insecticides    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 572.7 1,816.4
FMC Agricultural Solutions | Herbicides    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 220.1 948.7
FMC Agricultural Solutions | Fungicides    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 49.2 192.9
FMC Agricultural Solutions | Other    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 81.6 227.9
FMC Lithium    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 112.0 322.7
FMC Lithium | Lithium Hydroxide    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 52.8 155.5
FMC Lithium | Butyllithium    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 26.3 75.5
FMC Lithium | High Purity Lithium Metal and Other Specialty Compounds    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 14.5 47.8
FMC Lithium | Lithium Carbonate and Lithium Chloride    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers $ 18.4 $ 43.9