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Goodwill and Identifiable Intangible Assets - Remaining Estimated Future Amortization Expense (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Goodwill And Intangible Assets Disclosure [Abstract]  
2013 $ 29.3
2014 111.2
2015 85.4
2016 83.0
2017 79.8
Thereafter 406.9
Total $ 795.6