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Segment Information - Acquisition Related Charges (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting Information [Line Items]        
Total Transaction-related charges $ 25.0 $ 48.8 $ 149.1 $ 78.7
Legal and Professional Fees        
Segment Reporting Information [Line Items]        
Total Transaction-related charges 16.9 48.8 64.7 78.7
Inventory Fair Value Amortization        
Segment Reporting Information [Line Items]        
Total Transaction-related charges 1.3 0.0 69.6 0.0
Selling, General and Administrative Expenses | Cheminova        
Segment Reporting Information [Line Items]        
Total Transaction-related charges $ 6.8 $ 0.0 $ 14.8 $ 0.0