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DISCONTINUED OPERATIONS (Schedule of Disposal Groups, Including Discontinued Operations) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX | $ 238.0 | $ 30.6 | $ 102.8 | $ 25.6 |  |
Current assets of discontinued operations | 16.1 |  | 16.1 |  | $ 118.5 | $ 118.5
Non-current assets of discontinued operations | 0.0 |  | 0.0 |  | 20.3 | 20.3
Current liabilities of discontinued operations | 14.2 |  | 14.2 |  | 75.0 | 75.0
NON-CURRENT LIABILITIES OF DISCONTINUED OPERATIONS | 9.3 |  | 9.3 |  | $ 52.2 | 52.2
Net cash provided (used) by operating activities |  |  | 188.7 | 206.7 |  |
Net cash used by investing activities |  |  | (173.7) | (84.4) |  |
Asia Pacific Iron Ore [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX | 242.3 | (1.8) | 117.6 | 39.2 |  |
Current assets of discontinued operations | 16.1 |  | 16.1 |  |  | 118.5
Non-current assets of discontinued operations | 0.0 |  | 0.0 |  |  | 20.3
Current liabilities of discontinued operations | 7.2 |  | 7.2 |  |  | 71.8
NON-CURRENT LIABILITIES OF DISCONTINUED OPERATIONS | 9.3 |  | 9.3 |  |  | 52.2
North American Coal [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX | (4.3) | (0.7) | (4.2) | 1.9 |  |
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 | 7.0 |  | 7.0 |  |  | 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] |  |  |  |  |  |
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX | $ 0.0 | $ 33.1 | (10.6) | (15.5) |  |
Discontinued Operations [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Net cash provided (used) by operating activities |  |  | (91.6) | 78.5 |  |
Net cash used by investing activities |  |  | 17.8 | (1.5) |  |
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 (used) by operating activities |  |  | (77.0) | 78.5 |  |
Non-cash financing activities |  |  | 27.1 |  |  |
Net cash used by investing activities |  |  | 17.8 | (1.5) |  |
Discontinued Operations [Member] | Canadian Entities [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Net cash provided (used) by operating activities |  |  | $ (14.6) | $ 0.0 |  |

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