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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, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX | $ (43.9) | $ (6,613.0) | $ (869.0) | $ (6,829.8) |
Short-term assets of discontinued operations | 141.4 |  | 141.4 |  | $ 330.6
Long-term assets of discontinued operations | 0.0 |  | 0.0 |  | 400.1
Short-term liabilities of discontinued operations | 182.2 |  | 182.2 |  | 400.6
LONG-TERM LIABILITIES OF DISCONTINUED OPERATIONS | 0.0 |  | 0.0 |  | 436.1
Depreciation, depletion and amortization | 35.6 | 70.1 | 99.1 | 430.4 |
Payments to Acquire Property, Plant, and Equipment |  |  | 57.9 | 233.2 |
Asset Impairment Charges, Cash Flows |  |  | 76.6 | 7,773.1 |
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 | (29.8) | (579.7) | (137.0) | (643.6) |
Short-term assets of discontinued operations | 141.4 |  | 141.4 |  | 143.8
Long-term assets of discontinued operations | 0.0 |  | 0.0 |  | 130.4
Short-term liabilities of discontinued operations | 182.2 |  | 182.2 |  | 81.3
LONG-TERM LIABILITIES OF DISCONTINUED OPERATIONS | 0.0 |  | 0.0 |  | 125.9
Depreciation, depletion and amortization |  |  | 3.2 | 92.1 |
Payments to Acquire Property, Plant, and Equipment |  |  | 13.1 | 25.8 |
Asset Impairment Charges, Cash Flows |  |  | 73.4 | 0.0 |
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 | (14.1) | (5,782.5) | (731.9) | (5,930.4) |
Short-term assets of discontinued operations | 0.0 |  | 0.0 |  | 183.5
Long-term assets of discontinued operations | 0.0 |  | 0.0 |  | 256.0
Short-term liabilities of discontinued operations | 0.0 |  | 0.0 |  | 316.3
LONG-TERM LIABILITIES OF DISCONTINUED OPERATIONS | 0.0 |  | 0.0 |  | 304.6
Depreciation, depletion and amortization |  |  | 0.0 | 126.4 |
Payments to Acquire Property, Plant, and Equipment |  |  | 0.0 | 160.9 |
Asset Impairment Charges, Cash Flows |  |  | 0.0 | 6,307.3 |
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 | (250.8) | (0.1) | (255.8) |
Short-term assets of discontinued operations | 0.0 |  | 0.0 |  | 3.3
Long-term assets of discontinued operations | 0.0 |  | 0.0 |  | 13.7
Short-term liabilities of discontinued operations | 0.0 |  | 0.0 |  | 3.0
LONG-TERM LIABILITIES OF DISCONTINUED OPERATIONS | 0.0 |  | 0.0 |  | 5.6
Depreciation, depletion and amortization |  |  | 0.0 | 0.3 |
Payments to Acquire Property, Plant, and Equipment |  |  | 0.0 | 0.0 |
Asset Impairment Charges, Cash Flows |  |  | 0.0 | 259.5 |
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 | (14.1) | $ (6,033.3) | (732.0) | (6,186.2) |
Short-term assets of discontinued operations | 0.0 |  | 0.0 |  | 186.8
Long-term assets of discontinued operations | 0.0 |  | 0.0 |  | 269.7
Short-term liabilities of discontinued operations | 0.0 |  | 0.0 |  | 319.3
LONG-TERM LIABILITIES OF DISCONTINUED OPERATIONS | $ 0.0 |  | 0.0 |  | $ 310.2
Depreciation, depletion and amortization |  |  | 0.0 | 126.7 |
Payments to Acquire Property, Plant, and Equipment |  |  | 0.0 | 160.9 |
Asset Impairment Charges, Cash Flows |  |  | 0.0 | 6,566.8 |
Discontinued Operations [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Depreciation, depletion and amortization |  |  | 3.2 | 218.8 |
Payments to Acquire Property, Plant, and Equipment |  |  | 13.1 | 186.7 |
Asset Impairment Charges, Cash Flows |  |  | $ 73.4 | $ 6,566.8 |

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