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Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.2
ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Summary Of Mine Closure Obligations) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Loss Contingencies [Line Items] Ìý Ìý Ìý
Environmental $ 2.4 $ 2.5 Ìý
Asset Retirement Obligation 177.1 172.4 $ 168.4
Mine Reclamation and Closing Liability, current and noncurrent 179.5 174.9 Ìý
Accrued Reclamation Costs, Current 2.8 2.9 Ìý
ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS 176.7 172.0 Ìý
Mining and Pelletizing [Member] Ìý Ìý Ìý
Loss Contingencies [Line Items] Ìý Ìý Ìý
Asset Retirement Obligation $ 177.1 $ 172.4 Ìý