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Goodwill - Purchase Price and Fair Values of Assets Acquired and Liabilities Assumed (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Business Acquisition [Line Items]        
Goodwill $ 187.9 $ 187.9 $ 148.6 $ 149.0
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