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Financial Instruments, Risk Management and Fair Value Measurements - Nonrecurring Fair Value (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Derivative [Line Items]    
Net assets of discontinued operations held for sale $ (1.3) $ (1.0)
FMC Agricultural Solutions    
Derivative [Line Items]    
Impairment charge 1.3 1.0
Fair Value, Measurements, Nonrecurring | Estimate of Fair Value Measurement    
Derivative [Line Items]    
Net assets of discontinued operations held for sale 4.3 5.9
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Nonrecurring    
Derivative [Line Items]    
Net assets of discontinued operations held for sale 0.0 0.0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring    
Derivative [Line Items]    
Net assets of discontinued operations held for sale 0.0 0.0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring    
Derivative [Line Items]    
Net assets of discontinued operations held for sale $ 4.3 $ 5.9