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Quarterly report pursuant to Section 13 or 15(d)

RELATED PARTIES (Narrative) (Details)

v2.4.0.8
RELATED PARTIES (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items] Ìý Ìý
Extension of ArcelorMittal Contract 2 years Ìý
Due from Related Parties, Current $ 69.9 $ 132.0
Due to Related Parties, Current $ 26.3 $ 25.1
U.S. Iron Ore [Member]
Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
Number of mines (in number of facilities) 5 Ìý
Eastern Canadian Iron Ore [Member]
Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
Number of mines (in number of facilities) 2 Ìý
Joint Venture Partners [Member] | U.S. Iron Ore [Member]
Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
Number of mines (in number of facilities) 3 Ìý
Joint Venture Partners [Member] | Eastern Canadian Iron Ore [Member]
Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
Number of mines (in number of facilities) 1 Ìý