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RELATED PARTIES (Narrative) (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) Facility | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Due from Related Parties, Current | $ 57.9 | $ 57.9 |  | $ 15.8
Due to Related Parties, Current | 25.0 | $ 25.0 |  | $ 14.5
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] |  |  |  |
Paid Distributions of Partners' Equity Amounts | 17.0 | $ 17.0 | $ 17.1 |
Recorded Distributions of Partners' Equity Amounts | $ 24.4 | $ 41.4 | $ 31.7 |

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