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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 | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
INCOME (LOSS) FROM DISCONTINUED OPERATIONS, net of tax | $ 103.4 | $ (76.4) | $ (825.1) | $ (216.8) |
Short-term assets of discontinued operations | 150.5 |  | 150.5 |  | $ 330.6
Long-term assets of discontinued operations | 0.0 |  | 0.0 |  | 400.1
Short-term liabilities of discontinued operations | 196.9 |  | 196.9 |  | 400.6
LONG-TERM LIABILITIES OF DISCONTINUED OPERATIONS | 0.0 |  | 0.0 |  | 436.1
Depreciation, depletion and amortization | 30.5 | 70.9 | 63.5 | 286.4 |
Payments to Acquire Property, Plant, and Equipment |  |  | 34.4 | 164.3 |
Asset Impairment Charges, Cash Flows |  |  | 76.6 | 2.4 |
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 | (31.5) | (17.7) | (107.2) | (63.8) |
Short-term assets of discontinued operations | 150.5 |  | 150.5 |  | 143.8
Long-term assets of discontinued operations | 0.0 |  | 0.0 |  | 130.4
Short-term liabilities of discontinued operations | 196.9 |  | 196.9 |  | 81.3
LONG-TERM LIABILITIES OF DISCONTINUED OPERATIONS | 0.0 |  | 0.0 |  | 125.9
Depreciation, depletion and amortization |  |  | 3.2 | 61.9 |
Payments to Acquire Property, Plant, and Equipment |  |  | 5.5 | 20.2 |
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] |  |  |  |  |
INCOME (LOSS) FROM DISCONTINUED OPERATIONS, net of tax | 134.9 | (56.6) | (717.8) | (148.1) |
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 | 83.6 |
Payments to Acquire Property, Plant, and Equipment |  |  | 0.0 | 74.1 |
Asset Impairment Charges, Cash Flows |  |  | 0.0 | 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 | (2.1) | (0.1) | (4.9) |
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 | 0.2 |
Payments to Acquire Property, Plant, and Equipment |  |  | 0.0 | 0.0 |
Asset Impairment Charges, Cash Flows |  |  | 0.0 | 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 | 134.9 | $ (58.7) | (717.9) | (153.0) |
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 | 83.8 |
Payments to Acquire Property, Plant, and Equipment |  |  | 0.0 | 74.1 |
Asset Impairment Charges, Cash Flows |  |  | 0.0 | 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 | 145.7 |
Payments to Acquire Property, Plant, and Equipment |  |  | 5.5 | 94.3 |
Asset Impairment Charges, Cash Flows |  |  | $ 73.4 | $ 0.0 |

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