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DISCONTINUED OPERATIONS (Schedule of Disposal Groups, including Discontinued Operations) (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
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Net Cash Provided by (Used in) Investing Activities |  |  | $ (99.8) | $ (48.3) |  |
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX | $ (64.3) | $ (53.7) | (135.2) | (5.0) |  |
Current assets of discontinued operations | 45.3 |  | 45.3 |  | $ 118.5 | $ 118.5
Non-current assets of discontinued operations | 0.0 |  | 0.0 |  | 20.3 | 20.3
Current liabilities of discontinued operations | 117.3 |  | 117.3 |  | 75.0 | 75.0
NON-CURRENT LIABILITIES OF DISCONTINUED OPERATIONS | 10.3 |  | 10.3 |  | $ 52.2 | 52.2
Depreciation, depletion and amortization |  |  | 49.4 | 44.8 |  |
Payments to Acquire Property, Plant, and Equipment |  |  | 72.3 | 5.1 |  |
Asia Pacific Iron Ore [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Revenues from product sales and services | 70.1 | 98.0 | 129.1 | 273.4 |  |
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX | (53.3) | (7.3) | (124.7) | 41.0 |  |
Current assets of discontinued operations | 45.3 |  | 45.3 |  |  | 118.5
Non-current assets of discontinued operations | 0.0 |  | 0.0 |  |  | 20.3
Current liabilities of discontinued operations | 114.4 |  | 114.4 |  |  | 71.8
NON-CURRENT LIABILITIES OF DISCONTINUED OPERATIONS | 10.3 |  | 10.3 |  |  | 52.2
Disposal Group, Including Discontinued Operation, Costs of Goods Sold | (106.1) | (97.1) | (230.2) | (225.2) |  |
Sales margin | (36.0) | 0.9 | (101.1) | 48.2 |  |
Disposal Group, Including Discontinued Operation, Operating Expense | (16.2) | (3.2) | (18.8) | (3.7) |  |
Disposal Group, Including Discontinued Operation, Other Expense | (1.1) | (1.3) | (2.2) | (2.7) |  |
Loss from discontinued operations before income taxes | (53.3) | (3.6) | (122.1) | 41.8 |  |
Impairment of Long-Lived Assets to be Disposed of | 0.0 | 0.0 | (2.6) | 0.0 |  |
Discontinued Operation, Tax Effect of Discontinued Operation | 0.0 | (3.7) | 0.0 | (0.8) |  |
North American Coal [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX | (0.3) | 2.6 | 0.1 | 2.6 |  |
Current assets of discontinued operations | 0.0 |  | 0.0 |  |  | 0.0
Non-current assets of discontinued operations | 0.0 |  | 0.0 |  |  | 0.0
Current liabilities of discontinued operations | 2.9 |  | 2.9 |  |  | 3.2
NON-CURRENT LIABILITIES OF DISCONTINUED OPERATIONS | 0.0 |  | 0.0 |  |  | $ 0.0
Canadian Entities [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX | $ (10.7) | $ (49.0) | (10.6) | (48.6) |  |
Discontinued Operations [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Net Cash Provided by (Used in) Investing Activities |  |  | 14.1 | (0.8) |  |
Discontinued Operations [Member] | Asia Pacific Iron Ore [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Net Cash Provided by (Used in) Investing Activities |  |  | $ 14.1 | $ (0.8) |  |

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