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Acquisitions - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 16, 2018
Feb. 01, 2018
Nov. 01, 2017
Dec. 31, 2019
Dec. 31, 2018
Oct. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]              
Product portfolio sales       $ (0.1) $ 87.2   $ 0.0
Increase in goodwill         282.9    
European Herbicide Portfolio              
Business Acquisition [Line Items]              
Proceeds from sale   $ 85.0          
Proceeds from sale - working capital   2.0          
Product portfolio sales   $ 85.0          
DuPont Crop Protection Business              
Business Acquisition [Line Items]              
Product portfolio sales $ 3.0            
DuPont              
Business Acquisition [Line Items]              
Purchase price     $ 1,225.6        
Revenues since acquisition date             193.5
Income (loss) from continuing operations since acquisition date             27.6
Transitional services agreement, term     24 months        
Transitional services agreement, optional extension, term     6 months        
Supply agreement term       5 years      
Revenue recognized       $ 105.0 92.0   $ 2.0
Increase in goodwill           $ 283.0  
DuPont | FMC Agricultural Solutions              
Business Acquisition [Line Items]              
Income (loss) from continuing operations since acquisition date         $ 20.0