Quarterly report pursuant to Section 13 or 15(d)

INVENTORIES (Schedule Of Inventories) (Details)

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INVENTORIES (Schedule Of Inventories) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Inventory, Net [Abstract]    
Total inventories $ 312.7 $ 87.9
Mining and Pelletizing [Member]    
Inventory, Net [Abstract]    
Finished goods 287.7 77.8
Work-in-process $ 25.0 $ 10.1