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Estimated Annual Amortization Expense Related to Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Finite Lived Intangible Assets [Line Items]  
2013 $ 64.1
2014 63.2
2015 57.6
2016 39.2
2017 32.8
2018 and thereafter 107.7
Total $ 364.6