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Quarterly report pursuant to Section 13 or 15(d)

RELATED PARTIES (Narrative) (Details)

v3.5.0.2
RELATED PARTIES (Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Facility
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Segment Reporting Information [Line Items] Ìý Ìý Ìý Ìý Ìý
Due from Related Parties, Current $ 52.2 Ìý $ 52.2 Ìý $ 15.8
Due to Related Parties, Current 7.4 Ìý $ 7.4 Ìý $ 14.5
U.S. Iron Ore [Member] Ìý Ìý Ìý Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý Ìý Ìý Ìý
Number of mines (in number of facilities) | Facility Ìý Ìý 5 Ìý Ìý
Joint Venture Partners [Member] | U.S. Iron Ore [Member] Ìý Ìý Ìý Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý Ìý Ìý Ìý
Number of mines (in number of facilities) | Facility Ìý Ìý 3 Ìý Ìý
Empire [Member] | Arcelor Mittal [Member] Ìý Ìý Ìý Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý Ìý Ìý Ìý
Paid Distributions of Partners' Equity Amounts 41.4 $ 31.7 $ 41.4 $ 31.7 Ìý
Recorded Distributions of Partners' Equity Amounts $ 7.4 $ 9.0 $ 48.8 $ 40.7 Ìý