Annual report pursuant to Section 13 and 15(d)

INVENTORIES (Schedule Of Inventories) (Details)

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INVENTORIES (Schedule Of Inventories) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Inventory, Net [Abstract]    
Finished Goods $ 256.5 $ 283.2
Work-in Process 134.9 153.3
Total Inventory 391.4 436.5
U.S. Iron Ore [Member]
   
Inventory, Net [Abstract]    
Finished Goods 92.1 147.2
Work-in Process 13.0 22.9
Total Inventory 105.1 170.1
Eastern Canadian Iron Ore [Member]
   
Inventory, Net [Abstract]    
Finished Goods 65.3 62.6
Work-in Process 48.1 44.2
Total Inventory 113.4 106.8
Asia Pacific Iron Ore [Member]
   
Inventory, Net [Abstract]    
Finished Goods 39.7 36.7
Work-in Process 50.6 37.2
Total Inventory 90.3 73.9
North American Coal [Member]
   
Inventory, Net [Abstract]    
Finished Goods 59.4 36.7
Work-in Process 23.2 49.0
Total Inventory $ 82.6 $ 85.7