GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES (Narrative) (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
Dec. 31, 2017 |
|
| Goodwill [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý |
| Amortization of Intangible Assets | $ 0.2 | $ 0.2 | $ 0.4 | $ 0.4 | Ìý |
| Cost of Sales [Member] | Ìý | Ìý | Ìý | Ìý | Ìý |
| Goodwill [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý |
| Amortization of Intangible Assets | 0.2 | $ 0.2 | 0.4 | $ 0.4 | Ìý |
| U.S. Iron Ore [Member] | Ìý | Ìý | Ìý | Ìý | Ìý |
| Goodwill [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý |
| Goodwill | $ 2.0 | Ìý | $ 2.0 | Ìý | $ 2.0 |
| X | ||||||||||
- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|