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Goodwill and Intangible Assets, Net - Estimated Future Amortization Expense for Finite-lived Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Estimated Future Amortization Expense [Line Items]    
2013 $ 6.0  
2014 5.8  
2015 5.7  
2016 5.5  
2017 5.4  
Thereafter 40.4  
Total $ 68.8 $ 29.2