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Intangible Assets - Estimated Future Amortization Expense Related to Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
2012 $ 6.3
2013 25.4
2014 24.6
2015 24.6
2016 23.0
Thereafter 208.1
Net Carrying Amount $ 312.0