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Acquisitions Acquisition-related and Restructuring Charges (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Acquisition-related charges      
Total transaction-related charges $ 156.5 $ 150.4 $ 23.4
Restructuring charges      
Restructuring charges 124.1 8.5 43.4
Legal and Professional Fees | DuPont      
Acquisition-related charges      
Acquisition-related costs 86.9 130.2 0.0
Legal and Professional Fees | Cheminova      
Acquisition-related charges      
Acquisition-related costs 0.0 0.0 23.4
Inventory Fair Value Amortization | DuPont      
Acquisition-related charges      
Acquisition-related costs 69.6 20.2 0.0
DuPont Crop Restructuring      
Restructuring charges      
Restructuring charges 108.3 0.0 0.0
Cheminova Restructuring      
Restructuring charges      
Restructuring charges 0.0 0.0 42.3
DuPont And Cheminova Restructuring      
Restructuring charges      
Restructuring charges $ 108.3 $ 0.0 $ 42.3