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Financial Instrument, Risk Management and Fair Value Measurements, Nonrecurring Fair Value Measurements (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impairment loss on indefinite-lived intangible asset $ 42.0   $ 42.1 $ 9.3
Fair Value, Measurements, Nonrecurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total Gains (Losses) on Impairment of Crop Protection intangibles     (42.1)  
Total Gains (Losses) on Impairment of intangibles   $ (1.8) (1.3)  
Total Gains (Losses) on total assets   (1.8) (43.4)  
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impairment of Crop Protection intangibles 0.0   0.0  
Impairment of intangibles 0.0 0.0 0.0  
Total Assets 0.0 0.0 0.0  
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impairment of Crop Protection intangibles 0.0   0.0  
Impairment of intangibles 0.0 0.0 0.0  
Total Assets 0.0 0.0 0.0  
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impairment of Crop Protection intangibles 1,136.1   1,136.1  
Impairment of intangibles 4.3 3.1 4.3  
Total Assets 1,140.4 3.1 1,140.4  
Estimate of Fair Value Measurement | Fair Value, Measurements, Nonrecurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impairment of Crop Protection intangibles 1,136.1   1,136.1  
Impairment of intangibles 4.3 3.1 4.3  
Total Assets $ 1,140.4 3.1 1,140.4  
FMC Agricultural Solutions        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impairment loss on indefinite-lived intangible asset   $ 2.0 $ 1.0