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Acquisitions - Acquisition-related and Restructuring Charges (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Business Acquisition [Line Items]        
Restructuring charges $ 7.1 $ 76.8 $ 12.3 $ 79.4
DuPont        
Business Acquisition [Line Items]        
Acquisition-related charges 20.1 66.6 36.6 116.1
DuPont Crop restructuring        
Business Acquisition [Line Items]        
Restructuring charges 4.1 71.5 8.0 72.5
Legal and Professional Fees | DuPont        
Business Acquisition [Line Items]        
Acquisition-related charges 20.1 28.2 36.6 47.8
Inventory Fair Value Amortization | DuPont        
Business Acquisition [Line Items]        
Acquisition-related charges $ 0.0 $ 38.4 $ 0.0 $ 68.3