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Acquisitions - Acquisition-related and Restructuring Charges (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Business Acquisition [Line Items]        
Restructuring charges $ 16.2 $ 7.1 $ 22.8 $ 12.3
DuPont        
Business Acquisition [Line Items]        
Acquisition-related charges     26.0 36.6
DuPont Crop restructuring        
Business Acquisition [Line Items]        
Restructuring charges 16.2 4.1 23.2 8.0
Legal and Professional Fees | DuPont        
Business Acquisition [Line Items]        
Acquisition-related charges $ 13.0 $ 20.1 $ 26.0 $ 36.6