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Quarterly report pursuant to Section 13 or 15(d)

Environmental And Mine Closure Obligations (Asset Retirement Obligation Disclosure) (Detail)

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Environmental And Mine Closure Obligations (Asset Retirement Obligation Disclosure) (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Asset Retirement Obligation [Roll Forward]
Asset retirement obligation at beginning of period $ 194.9 $ 162.1
Accretion expense 13.2 15.7
Exchange rate changes 0.2 0.1
Revision in estimated cash flows 听听 3.7
Payments 听听 (0.7)
Acquired through business combinations 听听 14.0
Asset retirement obligation at end of period $ 208.3 $ 194.9