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Acquisitions Pro Forma Information (Details) - Cheminova - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Pro forma Revenue $ 4,285.3 $ 3,856.6 $ 3,714.1
Pro forma Diluted earnings per share (in dollars per share) $ 3.91 $ 2.25 $ 3.57