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REVENUE (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Revenues | $ 239.0 | $ 461.6 |  |
Deferred Revenue, Current | 31.0 |  |  | $ 23.8
Deferred Revenue, Noncurrent | 51.4 |  |  | 51.4
Other current liabilities | 104.3 |  | $ 87.6 | 86.2
Customer Supplemental Payments [Member] |  |  |  |
Deferred Revenue | 64.2 |  |  | 64.2
Deferred Revenue, Current | 12.8 |  |  | 12.8
Deferred Revenue, Noncurrent |  |  |  | 51.4
Take or Pay Contracts [Member] |  |  |  |
Deferred Revenue | 18.2 |  |  | $ 9.6
U.S. Iron Ore [Member] |  |  |  |
Revenues | 180.0 | 286.2 |  |
U.S. Iron Ore [Member] | Derivative Adjustment [Member] |  |  |  |
Revenues | 43.8 |  |  |
Asia Pacific Iron Ore [Member] |  |  |  |
Revenues | 59.0 | $ 175.4 |  |
Asia Pacific Iron Ore [Member] | Derivative Adjustment [Member] |  |  |  |
Revenues | 1.3 |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |
Revenues | 62.5 |  |  |
Other current liabilities | $ 0.3 |  | $ 1.4 |

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