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Discontinued Operations Narrative (Details) - USD ($)
shares in Millions
 12 Months Ended
Nov. 01, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Mar. 01, 2019
Aug. 01, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Net pretax actuarial gain and prior service credit   $ 5,400,000 $ 8,400,000      
After-tax actuarial gain and prior service credit   4,900,000 5,600,000      
Estimated pre-tax actuarial gain to be recognized in the next fiscal year   1,000,000.0        
Estimated prior service credit to be recognized in the next fiscal year   0        
Payments of other discontinued reserves   27,800,000 32,800,000 $ 25,600,000    
Omega 3 | Discontinued Operations, Disposed of by Sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Cash proceeds on sale           $ 38,000,000
Discontinued operations of FMC Health and Nutrition, net of income tax benefit (expense) of ($7.1), ($180.1) and ($43.8), respectively | Discontinued Operations, Held-for-sale or Disposed of by Sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Gain from disposal, before tax $ 918,000,000          
Gain on sale of FMC Health and Nutrition, net of income taxes $ 727,000,000 0 727,100,000 0    
Discontinued operations of FMC Health and Nutrition, net of income tax benefit (expense) of ($7.1), ($180.1) and ($43.8), respectively | Discontinued Operations, Held-for-sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Transitional services period 24 months          
Transitional services period, optional extension 6 months          
Workers’ compensation, product liability, and indemnification reserves            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Payments of other discontinued reserves   5,400,000 2,400,000 1,300,000    
Postretirement medical and life insurance benefits reserve, net            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Payments of other discontinued reserves   1,100,000 1,000,000.0 1,100,000    
SEC Schedule, 12-09, Reserve, Legal            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Payments of other discontinued reserves   $ 21,300,000 $ 18,900,000 $ 15,300,000    
Livent            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Disposal Group, Including Discontinued Operation, Consideration, Shares Transferred         123