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Quarterly report pursuant to Section 13 or 15(d)

ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Asset Retirement Obligation Disclosure) (Details)

v2.4.0.8
ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Asset Retirement Obligation Disclosure) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Asset Retirement Obligation [Roll Forward] Ìý Ìý
Asset retirement obligation at beginning of period $ 290.6 $ 231.1
Accretion expense 3.6 18.1
Exchange rate changes 1.0 (3.4)
Revision in estimated cash flows (22.1) 44.8
Payments ÌýÌý ÌýÌý
Asset retirement obligation at end of period $ 273.1 $ 290.6