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Receivables (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2016
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Beginning balance $ 38.7  
Additions - charged to expense 13.0 $ 8.4
Transfer from (to) allowance for credit losses (see below) (16.8) 9.5
Net recoveries, write-offs and other (1) (14.9) 3.2
Ending Balance 20.0 17.6
Net long-term customer receivables 81.2  
Allowance for long term customer receivables [Roll Forward]    
Beginning balance 47.1  
Additions - charged to expense 11.8 13.7
Transfer from (to) allowance for doubtful accounts (see above) 16.8 (9.5)
Foreign currency adjustments (4.4)  
Net recoveries, write-offs and other (8.7) (6.2)
Ending balance 62.6 $ 49.1
DuPont Crop restructuring    
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Write-offs $ 5.2