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Debt Debt, FMC Lithium Restructuring Credit Facility (Details) - USD ($)
Sep. 28, 2018
May 02, 2017
Revolving Credit Facility    
Debt Instrument [Line Items]    
Maximum borrowing capacity   $ 1,500,000,000.0
Revolving Credit Facility | Citibank, N.A. | FMC Lithium Revolving Credit Facility    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 400,000,000  
Borrowing capacity, increase limit $ 600,000,000  
Revolving Credit Facility | Citibank, N.A. | FMC Lithium Revolving Credit Facility | Federal Funds Effective Swap Rate    
Debt Instrument [Line Items]    
Basis spread on variable rate 0.50%  
Revolving Credit Facility | Citibank, N.A. | FMC Lithium Revolving Credit Facility | Eurodollar    
Debt Instrument [Line Items]    
Basis spread on variable rate 1.00%  
Letter of Credit | Citibank, N.A. | FMC Lithium Revolving Credit Facility    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 50,000,000