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Estimated Amortization Expenses for Intangible and Other Assets (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Finite-Lived Intangible Assets [Line Items]  
Remainder of 2012 $ 16.8
2013 30.4
2014 28.5
2015 26.4
2016 23.1
Thereafter 136.5
Estimated amortization expense, total $ 261.7