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Quarterly report pursuant to Section 13 or 15(d)

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

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Environmental And Mine Closure Obligations (Asset Retirement Obligation Disclosure) (Details) (USD $)
In Millions
9 Months Ended 12 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Environmental And Mine Closure Obligations [Abstract] Ìý Ìý
Asset retirement obligation at beginning of period $ 168.3 [1] $ 103.9 [1]
Accretion expense 11.8 13.1 [1]
Exchange rate changes (1.1) 2.5 [1]
Revision in estimated cash flows Ìý 1.0 [1]
Payments (0.7) (8.4) [1]
Acquired through business combinations 14.0 56.2 [1]
Asset retirement obligation at end of period $ 192.3 $ 168.3 [1]
[1] Represents a 12-month rollforward of our asset retirement obligation at December 31, 2010.