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Estimated Future Amortization Expense for Acquired Intangible Assets Subject to Amortization (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Schedule Of Actual And Estimated Amortization Expense [Line Items]  
2014 $ 25.9
2015 24.3
2016 23.7
2017 21.0
2018 16.0
Thereafter $ 110.7