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Acquisition Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Goodwill $ 540.4 $ 402.4 $ 394.2
Polyolefin Catalysts Business of Albemarle Corporation [Member]      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables 13.9    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory 28.6    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other 0.7    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 119.8    
Goodwill 140.6    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 121.2    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets 0.5    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities (7.3)    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net $ 418.0