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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, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Business Acquisition [Line Items]        
Goodwill $ 187.9 $ 187.9 $ 165.3 $ 149.0
Bachman Group Companies [Member]
       
Business Acquisition [Line Items]        
Other intangible assets 25.9      
Goodwill 23.2      
Deferred tax on intangibles (7.6)      
Other net assets acquired, excluding cash of $2.0 million 17.0      
Purchase price, net of cash acquired $ 58.5