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DISCONTINUED OPERATIONS Schedule of Disposal Groups, including Discontinued Operations, Income Statement, Balance Sheet and Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
LOSS FROM DISCONTINUED OPERATIONS, net of tax | $ (18.7) | $ (19.9) | $ (892.1)
Income (Loss) from Discontinued Operations, net of tax, including portion attributable to Noncontrolling interest, Canadian Entities and North American Coal |  |  | (892.1)
Short-term liabilities of discontinued operations | 3.2 | 6.0 |
Depreciation, depletion and amortization | 87.7 | 115.4 | 134.0
Purchase of property, plant and equipment | 151.7 | 69.1 | 80.8
Impairment of goodwill and other long-lived assets | 0.0 | 0.0 | 76.6
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 | 2.6 | (2.4) | (152.4)
Short-term liabilities of discontinued operations | 3.2 | 6.0 |
Depreciation, depletion and amortization |  |  | 3.2
Purchase of property, plant and equipment |  |  | 15.9
Impairment of goodwill and other long-lived assets |  |  | 73.4
Eastern Canadian Iron Ore [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
LOSS FROM DISCONTINUED OPERATIONS, net of tax | (21.3) | (17.5) | (638.7)
Short-term liabilities of discontinued operations | 0.0 | 0.0 |
Depreciation, depletion and amortization |  |  | 0.0
Purchase of property, plant and equipment |  |  | 0.0
Impairment of goodwill and other long-lived assets |  |  | 0.0
Other Canadian Operations [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
LOSS FROM DISCONTINUED OPERATIONS, net of tax | 0.0 | 0.0 | (101.0)
Short-term liabilities of discontinued operations | 0.0 | 0.0 |
Depreciation, depletion and amortization |  |  | 0.0
Purchase of property, plant and equipment |  |  | 0.0
Impairment of goodwill and other long-lived assets |  |  | 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 | (21.3) | (17.5) | (739.7)
Short-term liabilities of discontinued operations | $ 0.0 | $ 0.0 |
Depreciation, depletion and amortization |  |  | 0.0
Purchase of property, plant and equipment |  |  | 0.0
Impairment of goodwill and other long-lived assets |  |  | 0.0
Discontinued Operations [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Depreciation, depletion and amortization |  |  | 3.2
Purchase of property, plant and equipment |  |  | 15.9
Impairment of goodwill and other long-lived assets |  |  | $ 73.4

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