Quarterly report pursuant to Section 13 or 15(d)

Property, Plant And Equipment (Narrative) (Detail)

v2.4.0.6
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]        
Cost of goods sold depreciation and depletion expense $ 125.8 $ 98.4 $ 237.2 $ 170.1