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Goodwill and Identifiable Intangible Assets - Remaining Estimated Future Amortization Expense (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Goodwill And Intangible Assets Disclosure [Abstract]  
2014 $ 22.3
2015 85.9
2016 84.6
2017 79.0
2018 67.9
Thereafter 318.8
Total $ 658.5