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Receivables (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Allowance for trade receivables, beginning balance $ 38.6 $ 16.6
Additions — charged to expense 58.0 8.4
Transfer from (to) allowance for credit losses (17.3) 9.5
Net recoveries, write-offs and other (56.9) 4.1
Allowance for trade receivables, ending balance 22.4 38.6
Long term customer receivables 84.5  
Allowance for long term customer receivables [Roll Forward]    
Allowance for long term customer receivables, beginning 47.1 49.1
Additions — charged to expense 13.4 13.7
Transfer from (to) allowance for doubtful accounts 17.3 (9.5)
Net recoveries, write-offs and other (13.2) (6.2)
Foreign currency adjustments (4.1)  
Allowance for long term customer receivables, ending 60.5 $ 47.1
DuPont Crop Restructuring    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Write-offs of accounts receivable $ 42.0