Financial Instruments, Risk Management and Fair Value Measurements - Nonrecurring Fair Value (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
FMC Agricultural Solutions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Impairment charge	$ 1.0
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Gain (Loss) on Assets Acquired in Business Combination	(42.1)
Total Gains (Losses) on Impairment of intangibles	(1.3)
Total Gains (Losses) on Total assets	(43.4)
Fair Value, Measurements, Nonrecurring | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Impairment of Crop Protection intangibles (1)	1,136.1
Impairment of intangibles	4.3
Total assets	1,140.4
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Impairment of Crop Protection intangibles (1)	0.0
Impairment of intangibles	0.0
Total assets	0.0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Impairment of Crop Protection intangibles (1)	0.0
Impairment of intangibles	0.0
Total assets	0.0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Impairment of Crop Protection intangibles (1)	1,136.1
Impairment of intangibles	4.3
Total assets	$ 1,140.4