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Acquisitions - Acquisition-related and Restructuring Charges (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Business Acquisition [Line Items]    
Restructuring charges $ 5.2 $ 2.6
DuPont    
Business Acquisition [Line Items]    
Total Transaction-related charges 16.5 49.5
DuPont Crop restructuring    
Business Acquisition [Line Items]    
Restructuring charges 3.9 1.0
Legal and Professional Fees | DuPont    
Business Acquisition [Line Items]    
Acquisition-related charges 16.5 19.6
Inventory Fair Value Amortization | DuPont    
Business Acquisition [Line Items]    
Acquisition-related charges $ 0.0 $ 29.9