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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 | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | 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 | $ (2.7) | $ (43.9) | $ (0.6) | $ (869.0) |
Short-term assets of discontinued operations | 0.0 |  | 0.0 |  | $ 14.9
Short-term liabilities of discontinued operations | 5.5 |  | 5.5 |  | 6.9
Depreciation, depletion and amortization | 26.8 | 35.6 | 88.9 | 99.1 |
Payments to Acquire Property, Plant, and Equipment |  |  | 45.8 | 57.9 |
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] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Liabilities | 5.5 |  | 5.5 |  | 6.9
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX | (1.8) | (29.8) | (3.8) | (137.0) |
Short-term assets of discontinued operations | 0.0 |  | 0.0 |  | 14.9
Short-term liabilities of discontinued operations |  |  |  |  | 6.9
Depreciation, depletion and amortization |  |  |  | 3.2 |
Payments to Acquire Property, Plant, and Equipment |  |  |  | 13.1 |
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] |  |  |  |  |
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX | (0.9) | (14.1) | 3.2 | (731.9) |
Short-term assets of discontinued operations | 0.0 |  | 0.0 |  | 0.0
Short-term liabilities of discontinued operations | 0.0 |  | 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] |  |  |  |  |
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX | 0.0 | 0.0 | 0.0 | (0.1) |
Short-term assets of discontinued operations | 0.0 |  | 0.0 |  | 0.0
Short-term liabilities of discontinued operations | 0.0 |  | 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] |  |  |  |  |
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX | (0.9) | $ (14.1) | 3.2 | (732.0) |
Short-term assets of discontinued operations | 0.0 |  | 0.0 |  | 0.0
Short-term liabilities of discontinued operations | $ 0.0 |  | $ 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 |  |  |  | 13.1 |
Asset Impairment Charges, Cash Flows |  |  |  | $ 73.4 |

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