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Acquisition of European Differentiated Surfactants business - Schedule of Total Purchase Price and Estimated Allocation of Purchase Price to Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]      
Purchase price, net of cash acquired $ 197.4 $ 0.0 $ 98.7
Goodwill and Other Intangible Assets [Member]      
Business Acquisition [Line Items]      
Purchase price, net of cash acquired 107.4    
Fixed Assets [Member]      
Business Acquisition [Line Items]      
Purchase price, net of cash acquired 76.5    
Other Net Assets Acquired [Member]      
Business Acquisition [Line Items]      
Purchase price, net of cash acquired $ 15.3