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Estimated Annual Amortization Expense Related to Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]    
2013 $ 64.5  
2014 63.6  
2015 57.9  
2016 39.4  
2017 32.9  
2018 and thereafter 106.5  
Net Book Value, amortizable intangible assets $ 364.8 $ 572.2