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RELATED PARTIES (Narrative) (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) Facility | Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items] |  |  |
Due from Related Parties, Current | $ 12.2 | $ 12.2 | $ 127.6
Due to Related Parties, Current | 10.9 | $ 10.9 | $ 11.8
U.S. Iron Ore [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of mines (in number of facilities) | Facility |  | 5 |
Joint Venture Partners [Member] | U.S. Iron Ore [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of mines (in number of facilities) | Facility |  | 3 |
Empire [Member] | Arcelor Mittal [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Recorded Distributions of Partners' Equity Amounts | 9.0 | $ 40.7 |
Paid Distributions of Partners' Equity Amounts | $ 31.7 | $ 31.7 |

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