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Goodwill - Purchase Price and Fair Values of Assets Acquired and Liabilities Assumed (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Business Acquisition [Line Items]        
Goodwill $ 165.3 $ 149.0 $ 140.5 $ 141.5
Chemsil and Chemtec [Member]
       
Business Acquisition [Line Items]        
Other intangible assets 33.7      
Goodwill 17.0      
Other net assets 6.7      
Purchase price, net of cash acquired $ 57.4