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Quarterly report pursuant to Section 13 or 15(d)

ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Summary Of Mine Closure Obligations) (Details)

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ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Summary Of Mine Closure Obligations) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Loss Contingencies [Line Items] Ìý Ìý Ìý
Environmental $ 2.4 $ 2.5 Ìý
Asset Retirement Obligation 174.9 172.4 $ 168.4
Environmental Loss Contingency And Mine Reclamation And Closing Liability Current And Noncurrent 177.3 174.9 Ìý
Environmental Loss Contingency And Mine Reclamation And Closing Liability Current 2.9 2.9 Ìý
Environmental Loss Contingency And Mine Reclamation And Closing Liability Noncurrent 174.4 172.0 Ìý
Mining and Pelletizing [Member] Ìý Ìý Ìý
Loss Contingencies [Line Items] Ìý Ìý Ìý
Asset Retirement Obligation $ 174.9 $ 172.4 Ìý