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Goodwill - Purchase Price and Fair Values of Assets Acquired and Liabilities Assumed (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Business Acquisition [Line Items]      
Goodwill $ 187.9 $ 149.0 $ 141.5
Bachman Group Companies [Member]
      
Business Acquisition [Line Items]      
Other intangible assets 25.9    
Goodwill 22.9    
Deferred tax on intangibles (7.6)    
Other net assets acquired 17.6    
Purchase price, net of cash acquired 58.8    
Chemsil & Chemtec [Member]
      
Business Acquisition [Line Items]      
Other intangible assets 34.0    
Goodwill 16.7    
Other net assets acquired 6.7    
Purchase price, net of cash acquired $ 57.4