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Goodwill - Purchase Price and Fair Values of Assets Acquired and Liabilities Assumed (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Business Acquisition [Line Items]        
Goodwill $ 148.7 $ 149.0 $ 140.8 $ 141.5
Strata [Member]
       
Business Acquisition [Line Items]        
Other intangible assets 48.0      
Goodwill 9.1      
Other net assets 1.7      
Purchase price, net of cash acquired $ 58.8