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Annual report pursuant to Section 13 and 15(d)

ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Narrative) (Details)

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ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Site Contingency [Line Items] Ìý Ìý
Accrual for Environmental Loss Contingencies $ 2.9 $ 2.5
Environmental Loss Contingency And Mine Reclamation And Closing Liability Current And Noncurrent 171.3 $ 174.9
Accrual for Environmental Loss Contingencies, Period Increase (Decrease) $ (26.2) Ìý