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REVENUE (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Revenues | $ 714.3 | $ 471.3 | $ 894.3 | $ 757.5 |  |
Deferred revenue, current | 20.0 |  | 20.0 |  |  | $ 23.8
Deferred revenue, noncurrent | 47.1 |  | 47.1 |  |  | 51.4
Other current liabilities | 66.2 |  | 66.2 |  | $ 68.8 | 67.4
Customer Supplemental Payments [Member] |  |  |  |  |  |
Deferred revenue | 59.9 |  | 59.9 |  |  | 64.2
Deferred revenue, current | 12.8 |  | 12.8 |  |  | 12.8
Take or Pay Contracts [Member] |  |  |  |  |  |
Deferred revenue | 7.2 |  | 7.2 |  |  | $ 9.6
U.S. Iron Ore [Member] |  |  |  |  |  |
Revenues | 714.3 | 471.3 | 894.3 | 757.5 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |
Revenues | 110.0 |  | 47.5 |  |  |
Other current liabilities | 5.9 |  | 5.9 |  | $ 1.4 |
Not Designated as Hedging Instrument [Member] |  |  |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ 154.7 | $ 30.8 | $ 198.5 | $ 63.0 |  |

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