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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, 2017
Dec. 31, 2016
Asset Retirement Obligation [Roll Forward] Ìý Ìý
Asset retirement obligation at beginning of period $ 204.0 $ 230.4
Accretion expense 11.1 14.0
Asset Retirement Obligation, Liabilities Settled (3.2) (2.2)
Exchange rate changes 1.4 (0.2)
Revision in estimated cash flows Ìý (38.0)
Asset retirement obligation at end of period $ 213.3 $ 204.0