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DISCONTINUED OPERATIONS Schedule of Disposal Groups, including Discontinued Operations, Income Statement, Balance Sheet and Cash Flows (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
INCOME (LOSS) FROM DISCONTINUED OPERATIONS, NET OF TAX | $ 2.5 | $ (928.5) |
Short-term assets of discontinued operations | 0.5 |  | $ 14.9
Short-term liabilities of discontinued operations | 4.3 |  | 6.9
Depreciation, depletion and amortization | 35.2 | 33.0 |
Payments to Acquire Property, Plant, and Equipment | 10.4 | 15.9 |
Asset Impairment Charges, Cash Flows | 0.0 | 76.6 |
North American Coal [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
INCOME (LOSS) FROM DISCONTINUED OPERATIONS, NET OF TAX | (1.3) | (75.7) |
Short-term assets of discontinued operations | 0.5 |  | 14.9
Short-term liabilities of discontinued operations | 4.3 |  | 6.9
Depreciation, depletion and amortization |  | 3.2 |
Payments to Acquire Property, Plant, and Equipment |  | 2.5 |
Asset Impairment Charges, Cash Flows |  | 73.4 |
Eastern Canadian Iron Ore [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
INCOME (LOSS) FROM DISCONTINUED OPERATIONS, NET OF TAX | 3.8 | (852.7) |
Short-term assets of discontinued operations | 0.0 |  | 0.0
Short-term liabilities of discontinued operations | 0.0 |  | 0.0
Depreciation, depletion and amortization |  | 0.0 |
Payments to Acquire Property, Plant, and Equipment |  | 0.0 |
Asset Impairment Charges, Cash Flows |  | 0.0 |
Other Canadian Operations [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
INCOME (LOSS) FROM DISCONTINUED OPERATIONS, NET OF TAX | 0.0 | (0.1) |
Short-term assets of discontinued operations | 0.0 |  | 0.0
Short-term liabilities of discontinued operations | 0.0 |  | 0.0
Depreciation, depletion and amortization |  | 0.0 |
Payments to Acquire Property, Plant, and Equipment |  | 0.0 |
Asset Impairment Charges, Cash Flows |  | 0.0 |
Canadian Entities [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
INCOME (LOSS) FROM DISCONTINUED OPERATIONS, NET OF TAX | 3.8 | (852.8) |
Short-term assets of discontinued operations | 0.0 |  | 0.0
Short-term liabilities of discontinued operations | $ 0.0 |  | $ 0.0
Depreciation, depletion and amortization |  | 0.0 |
Payments to Acquire Property, Plant, and Equipment |  | 0.0 |
Asset Impairment Charges, Cash Flows |  | 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 |
Payments to Acquire Property, Plant, and Equipment |  | 2.5 |
Asset Impairment Charges, Cash Flows |  | $ 73.4 |

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