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Principal Accounting Policies and Related Financial Information (Details)
shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
class
segment
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Oct. 15, 2018
shares
Nature of Operations          
Number of business segments | segment   1      
Number of major classes of crop protection | class   3      
Original maturity, maximum number of months   3 months      
Trade receivable, net of allowance          
Allowance for trade receivable $ 38.6 $ 22.4 $ 38.6 $ 16.6  
Allowance for long term customer receivables, beginning 47.1 60.5 47.1 49.1  
Additions — charged to expense   $ 71.4 22.1 22.0  
Investments          
Maximum ownership percentage for equity method investments   50.00%      
Capitalized Interest          
Capitalized interest costs   $ 4.1 1.6 1.9  
Asset Retirement Obligation [Abstract]          
Asset retirement obligation 1.9 $ 2.6 1.9    
Goodwill and Intangible Assets          
Impairment loss on indefinite-lived intangible asset $ 42.0   $ 42.1 $ 9.3  
Minimum          
Goodwill and Intangible Assets          
Useful lives of finite-lived intangible assets   3 years      
Maximum          
Goodwill and Intangible Assets          
Useful lives of finite-lived intangible assets   20 years      
Land Improvements          
Property, Plant and Equipment          
Useful lives of property, plant and equipment   20 years      
Building | Minimum          
Property, Plant and Equipment          
Useful lives of property, plant and equipment   20 years      
Building | Maximum          
Property, Plant and Equipment          
Useful lives of property, plant and equipment   40 years      
Machinery and Equipment | Minimum          
Property, Plant and Equipment          
Useful lives of property, plant and equipment   3 years      
Machinery and Equipment | Maximum          
Property, Plant and Equipment          
Useful lives of property, plant and equipment   18 years      
Software Development | Minimum          
Property, Plant and Equipment          
Useful lives of property, plant and equipment   3 years      
Software Development | Maximum          
Property, Plant and Equipment          
Useful lives of property, plant and equipment   10 years      
Livent          
Nature of Operations          
Shares owned by parent (in shares) | shares         123
Outstanding shares of parent, percentage         84.00%