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Acquisitions - Acquisition-related and Restructuring Charges (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Business Acquisition [Line Items]        
Acquisition-related charges $ 25.0 $ 48.8 $ 149.1 $ 78.7
Total Transaction-related charges 25.0 48.8 149.1 78.7
Restructuring charges 25.1 4.4 106.6 7.1
DuPont        
Business Acquisition [Line Items]        
Total Transaction-related charges 25.0 48.8 149.1 78.7
DuPont Crop restructuring        
Business Acquisition [Line Items]        
Restructuring charges 20.0 0.0 92.5 0.0
Legal and Professional Fees        
Business Acquisition [Line Items]        
Acquisition-related charges 16.9 48.8 64.7 78.7
Legal and Professional Fees | DuPont        
Business Acquisition [Line Items]        
Acquisition-related charges 16.9 48.8 64.7 78.7
Inventory Fair Value Amortization        
Business Acquisition [Line Items]        
Acquisition-related charges 1.3 0.0 69.6 0.0
Inventory Fair Value Amortization | DuPont        
Business Acquisition [Line Items]        
Acquisition-related charges 1.3 0.0 69.6 0.0
Selling, General and Administrative Expenses | Lithium restructuring        
Business Acquisition [Line Items]        
Separation-related charges $ 6.8 $ 0.0 $ 14.8 $ 0.0