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Receivables (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Beginning balance $ 22.4 $ 38.6
Additions - charged to expense 3.0 58.0
Transfer from (to) allowance for credit losses (see below)   (17.3)
Net recoveries, write-offs and other 1.9 (56.9)
Ending Balance 27.3 22.4
Net long-term customer receivables 89.3  
Allowance for long term customer receivables [Roll Forward]    
Beginning balance 60.5 47.1
Additions - charged to expense 7.4 13.4
Transfer from (to) allowance for doubtful accounts (see above)   17.3
Foreign currency adjustments 0.3 (4.1)
Net recoveries, write-offs and other   (13.2)
Ending balance $ 68.2 60.5
DuPont Crop restructuring    
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Write-offs   $ 42.0