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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, 2018 | Dec. 31, 2017
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] |  |
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 | Estimate of Fair Value Measurement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |
Impairment of Crop Protection intangibles |  | 1,136.1
Impairment of intangibles | 3.1 | 4.3
Total assets | 3.1 | 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 |  | 0.0
Impairment of intangibles | 0.0 | 0.0
Total assets | 0.0 | 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 |  | 0.0
Impairment of intangibles | 0.0 | 0.0
Total assets | 0.0 | 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 |  | 1,136.1
Impairment of intangibles | 3.1 | 4.3
Total assets | $ 3.1 | $ 1,140.4

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- Definition Gain (Loss) on Long Lived and Intangible Assets Associated with Exit Activities + References No definition available. + Details
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