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Quarterly report pursuant to Section 13 or 15(d)

RELATED PARTIES (Narrative) (Details)

v3.2.0.727
RELATED PARTIES (Narrative) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2015
USD ($)
Facility
Dec. 31, 2014
USD ($)
Segment Reporting Information [Line Items] Ìý Ìý
Due from Related Parties, Current $ 18.4 $ 127.6
Due to Related Parties, Current $ 18.3 $ 11.8
U.S. Iron Ore [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
Number of mines (in number of facilities) | Facility 5 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) | Facility 3 Ìý
Empire [Member] | Arcelor Mittal [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
Recorded Distributions of Partners' Equity Amounts $ 31.7 Ìý
Paid Distributions of Partners' Equity Amounts $ 17.1 Ìý