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Quarterly report pursuant to Section 13 or 15(d)

RELATED PARTIES (Narrative) (Details)

v3.4.0.3
RELATED PARTIES (Narrative) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
Facility
Dec. 31, 2015
USD ($)
Segment Reporting Information [Line Items] Ìý Ìý
Due from Related Parties, Current $ 10.7 $ 15.8
Due to Related Parties, Current $ 17.5 $ 14.5
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
Paid Distributions of Partners' Equity Amounts $ 11.1 Ìý
Recorded Distributions of Partners' Equity Amounts $ 17.0 Ìý