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
Jun. 30, 2016
Dec. 31, 2015
Inventory, Net [Abstract]    
Finished Goods $ 323.5 $ 273.1
Work-in Process 67.7 56.5
Total Inventory 391.2 329.6
U.S. Iron Ore [Member]    
Inventory, Net [Abstract]    
Finished Goods 309.9 252.3
Work-in Process 26.7 11.7
Total Inventory 336.6 264.0
Asia Pacific Iron Ore [Member]    
Inventory, Net [Abstract]    
Finished Goods 13.6 20.8
Work-in Process 41.0 44.8
Total Inventory $ 54.6 $ 65.6