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Restructuring and Other Charges (Income) - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Oct. 02, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]          
Expected remaining restructuring costs, less than     $ 5.0    
Restructuring charges     42.6 $ 62.2 $ 124.1
Unfavorable court ruling charge   $ 72.8      
Isagro          
Restructuring Cost and Reserve [Line Items]          
Asset sale and purchase agreement, purchase price $ 65.0        
Asset sale and purchase agreement, charges     65.6    
DuPont Crop Restructuring          
Restructuring Cost and Reserve [Line Items]          
Expected remaining restructuring costs, less than     5.0    
Restructuring charges     $ 40.2 $ 26.4 108.3
Accelerated depreciation charges         17.4
DuPont Crop Restructuring | Change to market access          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges         59.0
DuPont Crop Restructuring | Severance and other employee benefits          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges         4.0
DuPont Crop Restructuring | Migration of research and development activities and employees          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges         27.8
DuPont Crop Restructuring | Future liability of rental obligation          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges         11.2
DuPont Crop Restructuring | Reduction of capital lease liability          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges         6.0
DuPont Crop Restructuring | Severance, relocation and other employee related charges          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges         5.2
DuPont Crop Restructuring, India Market Operations          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges         $ 63.0