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Quarterly report pursuant to Section 13 or 15(d)

RELATED PARTIES (Narrative) (Details)

v3.7.0.1
RELATED PARTIES (Narrative) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
Facility
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Segment Reporting Information [Line Items] Ìý Ìý Ìý
Due to Related Parties, Current Ìý Ìý $ 8.7
Trade Accounts Receivable [Member] Ìý Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý Ìý
Due from Related Parties, Current $ 9.1 Ìý 46.9
Other Current Assets [Member] Ìý Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý Ìý
Due from Related Parties, Current $ 53.8 Ìý $ 26.8
U.S. Iron Ore [Member] Ìý Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý Ìý
Number of mines (in number of facilities) | Facility 4 Ìý Ìý
Joint Venture Partners [Member] | U.S. Iron Ore [Member] Ìý Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý Ìý
Number of mines (in number of facilities) | Facility 2 Ìý Ìý
Empire [Member] | Arcelor Mittal [Member] Ìý Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý Ìý
Subsequent Paid Distributions of Partners' Equity Amounts $ 8.7 $ 11.1 Ìý
Recorded Distributions of Partners' Equity Amounts Ìý $ 17.0 Ìý