Quarterly report pursuant to Section 13 or 15(d)

Property, Plant And Equipment (Narrative) (Detail)

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Property, Plant And Equipment (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Property, Plant and Equipment [Line Items]        
Cost of goods sold depreciation and depletion expense $ 127.7 $ 109.6 $ 364.9 $ 279.7