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Quarterly report pursuant to Section 13 or 15(d)

INVENTORIES (Narrative) (Details)

v2.4.0.8
INVENTORIES (Narrative) (Details) (Cost of Sales [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Eastern Canadian Iron Ore [Member]
 Ìý Ìý Ìý Ìý
Inventory [Line Items] Ìý Ìý Ìý Ìý
Inventory Write-down $ 2.6 Ìý $ 18.6 Ìý
North American Coal [Member]
 Ìý Ìý Ìý Ìý
Inventory [Line Items] Ìý Ìý Ìý Ìý
Inventory Write-down 5.0 2.6 42.1 5.3
Bloom Lake [Member] | Eastern Canadian Iron Ore [Member]
 Ìý Ìý Ìý Ìý
Inventory [Line Items] Ìý Ìý Ìý Ìý
Inventory Write-down 1.9 Ìý Ìý Ìý
Wabush [Member] | Eastern Canadian Iron Ore [Member]
 Ìý Ìý Ìý Ìý
Inventory [Line Items] Ìý Ìý Ìý Ìý
Inventory Write-down 0.7 Ìý Ìý Ìý
Pellets [Member] | Wabush [Member]
 Ìý Ìý Ìý Ìý
Inventory [Line Items] Ìý Ìý Ìý Ìý
Inventory Write-down Ìý Ìý Ìý 11.1
Unsaleable Inventory Impairment Charge Ìý Ìý Ìý 10.6
Sinter feed [Member] | Eastern Canadian Iron Ore [Member]
 Ìý Ìý Ìý Ìý
Inventory [Line Items] Ìý Ìý Ìý Ìý
Inventory Write-down Ìý $ 5.9 Ìý $ 10.6