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, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Inventory, Net [Abstract]    
Finished Goods $ 376.2 $ 256.5
Work-in Process 140.5 134.9
Total Inventory 516.7 391.4
U.S. Iron Ore [Member]
   
Inventory, Net [Abstract]    
Finished Goods 279.5 92.1
Work-in Process 23.5 13.0
Total Inventory 303.0 105.1
Eastern Canadian Iron Ore [Member]
   
Inventory, Net [Abstract]    
Finished Goods 18.2 65.3
Work-in Process 15.8 48.1
Total Inventory 34.0 113.4
Asia Pacific Iron Ore [Member]
   
Inventory, Net [Abstract]    
Finished Goods 25.8 39.7
Work-in Process 85.1 50.6
Total Inventory 110.9 90.3
North American Coal [Member]
   
Inventory, Net [Abstract]    
Finished Goods 52.7 59.4
Work-in Process 16.1 23.2
Total Inventory $ 68.8 $ 82.6