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Property Plant and Equipment - Additional Information (Detail) (Property Plant and Equipment, USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Property Plant and Equipment
       
Component of Operating Other Cost and Expense [Line Items]        
Depreciation of property, plant and equipment $ 34.4 $ 34.6 $ 100.0 $ 97.2