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, 2013
Dec. 31, 2012
Inventory, Net [Abstract]    
Finished Goods $ 324.2 $ 283.2
Work-in Process 114.2 153.3
Total Inventory 438.4 436.5
U.S. Iron Ore [Member]
   
Inventory, Net [Abstract]    
Finished Goods 160.4 147.2
Work-in Process 20.3 22.9
Total Inventory 180.7 170.1
Eastern Canadian Iron Ore [Member]
   
Inventory, Net [Abstract]    
Finished Goods 54.2 62.6
Work-in Process 36.2 44.2
Total Inventory 90.4 106.8
Asia Pacific Iron Ore [Member]
   
Inventory, Net [Abstract]    
Finished Goods 54.0 36.7
Work-in Process 34.7 37.2
Total Inventory 88.7 73.9
North American Coal [Member]
   
Inventory, Net [Abstract]    
Finished Goods 55.6 36.7
Work-in Process 23.0 49.0
Total Inventory $ 78.6 $ 85.7