Quarterly report pursuant to Section 13 or 15(d)

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

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Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Loss Contingencies [Line Items]      
Environmental $ 2.1 $ 2.5  
Asset Retirement Obligation 179.5 172.4 $ 168.4
Mine Reclamation and Closing Liability, current and noncurrent 181.6 174.9  
Accrued Reclamation Costs, Current 2.5 2.9  
ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS 179.1 172.0  
Mining and Pelletizing [Member]      
Loss Contingencies [Line Items]      
Asset Retirement Obligation $ 179.5 $ 172.4