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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 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Property, Plant and Equipment [Line Items] Ìý Ìý Ìý Ìý
Cost of goods sold depreciation and depletion expense $ 125.8 $ 98.4 $ 237.2 $ 170.1