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v3.3.1.900

RELATED PARTIES (Narrative) (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) Facility | Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items] |  |
Due from Related Parties, Current | $ 15.8 | $ 127.6
Due to Related Parties, Current | $ 14.5 | $ 11.8
U.S. Iron Ore [Member] |  |
Segment Reporting Information [Line Items] |  |
Number Of Mines | Facility | 5 |
Joint Venture Partners [Member] | U.S. Iron Ore [Member] |  |
Segment Reporting Information [Line Items] |  |
Number Of Mines | Facility | 3 |
Empire [Member] | Arcelor Mittal [Member] |  |
Segment Reporting Information [Line Items] |  |
Recorded Distributions of Partners' Equity Amounts | $ 51.7 |
Paid Distributions of Partners' Equity Amounts | $ 40.6 |

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