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Goodwill and Identifiable Intangible Assets - Remaining Estimated Future Amortization Expense (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]  
2013 $ 87.5
2014 109.3
2015 83.7
2016 81.9
2017 79.0
Thereafter 399.9
Total $ 841.3