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Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accrual for Environmental Loss Contingencies $ 2.5 $ 2.9 Ìý
Asset Retirement Obligation 172.4 168.4 $ 187.8
Environmental Loss Contingency And Mine Reclamation And Closing Liability Current And Noncurrent 174.9 171.3 Ìý
Environmental Loss Contingency And Mine Reclamation And Closing Liability Current 2.9 3.6 Ìý
Environmental Loss Contingency And Mine Reclamation And Closing Liability Noncurrent 172.0 167.7 Ìý
Asset Retirement Obligation, Accretion Expense 9.5 13.9 Ìý
Asset Retirement Obligation, Liabilities Settled (1.0) (5.6) Ìý
Asset Retirement Obligation, Revision of Estimate (4.5) (27.7) Ìý
Mining and Pelletizing [Member] Ìý Ìý Ìý
Asset Retirement Obligation $ 172.4 $ 168.4 Ìý