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DISCONTINUED OPERATIONS (Tables) | 12 Months Ended
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Dec. 31, 2016
Schedule of Disposal Groups, Including Discontinued Operations, Assets and Liabilities [Line Items] |
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block] |
(In Millions)
|  |  |  | Canadian Operations |  |  |
|  | North American Coal |  | Eastern Canadian Iron Ore | Other | Total Canadian Operations |  | Total of Discontinued Operations
Statements of Consolidated Operations |  |  |  |  |  |  |
Loss from Discontinued Operations, net of tax | YTD December 31, 2016 | $ | (2.4 | ) |  | $ | (17.5 | ) | $ | — |  | $ | (17.5 | ) |  | $ | (19.9 | )
Loss from Discontinued Operations, net of tax | YTD December 31, 2015 | $ | (152.4 | ) |  | $ | (638.7 | ) | $ | (101.0 | ) | $ | (739.7 | ) |  | $ | (892.1 | )
Loss from Discontinued Operations, net of tax | YTD December 31, 2014 | $ | (1,134.5 | ) |  | $ | (6,952.9 | ) | $ | (280.6 | ) | $ | (7,233.5 | ) |  | $ | (8,368.0 | )
Statements of Consolidated Financial Position |  |  |  |  |  |  |
Other current liabilities | As of December 31, 2016 | $ | 6.0 |  |  | $ | — |  | $ | — |  | $ | — |  |  | $ | 6.0 |
Other current assets | As of December 31, 2015 | $ | 14.9 |  |  | $ | — |  | $ | — |  | $ | — |  |  | $ | 14.9 |
Other current liabilities | As of December 31, 2015 | $ | 6.9 |  |  | $ | — |  | $ | — |  | $ | — |  |  | $ | 6.9 |
Non-Cash Operating and Investing Activities
Depreciation, depletion and amortization | YTD December 31, 2015 | $ | 3.2 |  |  | $ | — |  | $ | — |  | $ | — |  |  | $ | 3.2 |
Purchase of property, plant and equipment | YTD December 31, 2015 | $ | 15.9 |  |  | $ | — |  | $ | — |  | $ | — |  |  | $ | 15.9 |
Impairment of goodwill and other long-lived assets | YTD December 31, 2015 | $ | 73.4 |  |  | $ | — |  | $ | — |  | $ | — |  |  | $ | 73.4 |
Depreciation, depletion and amortization | YTD December 31, 2014 | $ | 106.9 |  |  | $ | 135.6 |  | $ | 0.5 |  | $ | 136.1 |  |  | $ | 243.0 |
Purchase of property, plant and equipment | YTD December 31, 2014 | $ | 29.9 |  |  | $ | 190.3 |  | $ | — |  | $ | 190.3 |  |  | $ | 220.2 |
Impairment of goodwill and other long-lived assets | YTD December 31, 2014 | $ | 857.5 |  |  | $ | 7,269.2 |  | $ | 267.6 |  | $ | 7,536.8 |  |  | $ | 8,394.3 |
North American Coal [Member] |
Schedule of Disposal Groups, Including Discontinued Operations, Assets and Liabilities [Line Items] |
Schedule of Disposal Groups, including Discontinued Operations, Income Statement [Table Text Block] | Loss on Discontinued Operations The sale of our Oak Grove and Pinnacle mines on December 22, 2015 completed a strategic shift in our business. Our previously reported North American Coal operating segment results for all periods, prior to the March 31, 2015 held for sale determination, are classified as discontinued operations. Historical results also include our CLCC assets, which were sold during the fourth quarter of 2014.
|  | (In Millions)
|  | Year Ended December 31,
Loss from Discontinued Operations |  | 2016 |  | 2015 |  | 2014
Revenues from product sales and services |  | $ | — |  |  | $ | 392.9 |  |  | $ | 687.1 |
Cost of goods sold and operating expenses |  | — |  |  | (449.2 | ) |  | (822.9 | )
Sales margin |  | — |  |  | (56.3 | ) |  | (135.8 | )
Other operating expense |  | (4.5 | ) |  | (30.4 | ) |  | (20.8 | )
Gain (loss) on sale of coal mines |  | 2.1 |  |  | 9.3 |  |  | (419.6 | )
Other expense |  | — |  |  | (1.8 | ) |  | (3.0 | )
Loss from discontinued operations before income taxes |  | (2.4 | ) |  | (79.2 | ) |  | (579.2 | )
Impairment of long-lived assets |  | — |  |  | (73.4 | ) |  | (857.5 | )
Income tax benefit |  | — |  |  | 0.2 |  |  | 302.2 |
Loss from discontinued operations, net of tax |  | $ | (2.4 | ) |  | $ | (152.4 | ) |  | $ | (1,134.5 | )
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Table Text Block] | Items Measured at Fair Value on a Non-Recurring Basis The following table presents information about the impairment charge on non-financial assets that was measured on a fair value basis at March 31, 2015 for the North American Coal operations. There were no financial and non-financial assets and liabilities that were measured on a non-recurring fair value basis at December 31, 2016 for the North American Coal operations. The table also indicates the fair value hierarchy of the valuation techniques used to determine such fair value.
|  | (In Millions)
|  | March 31, 2015
Description |  | Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total |  | Total Losses
Assets: |  |  |  |  |  |  |  |  |  |
Other long-lived assets - Property, plant and equipment and Mineral rights: North American Coal operating unit |  | $ | — |  |  | $ | — |  |  | $ | 20.4 |  |  | $ | 20.4 |  |  | $ | 73.4 |
|  | $ | — |  |  | $ | — |  |  | $ | 20.4 |  |  | $ | 20.4 |  |  | $ | 73.4 |
Schedule of Disposal Groups, Including Discontinued Operations, Assets and Liabilities [Table Text Block] | Recorded Assets and Liabilities
|  | (In Millions)
Assets and Liabilities of Discontinued Operations 1 |  | December 31, 2016 |  | December 31, 2015
Other current assets |  | $ | — |  |  | $ | 14.9 |
Total assets of discontinued operations |  | $ | — |  |  | $ | 14.9 |
Accrued liabilities |  | $ | 1.1 |  |  | $ | — |
Other current liabilities |  | 4.9 |  |  | 6.9 |
Total liabilities of discontinued operations |  | $ | 6.0 |  |  | $ | 6.9 |
1 At December 31, 2016 and 2015, we also recorded $2.1 million and $7.8 million, respectively, of contingent liabilities associated with our exit from the coal business recorded on our parent company.
Canadian Entities [Member] |
Schedule of Disposal Groups, Including Discontinued Operations, Assets and Liabilities [Line Items] |
Schedule of Disposal Groups, including Discontinued Operations, Income Statement [Table Text Block] | Loss on Discontinued Operations Our Canadian exit represents a strategic shift in our business. For this reason, our previously reported Eastern Canadian Iron Ore and Ferroalloys operating segment results for all periods prior to the respective deconsolidations, as well as costs to exit, are classified as discontinued operations.
|  | (In Millions)
|  | Year Ended December 31,
Loss from Discontinued Operations |  | 2016 |  | 2015 |  | 2014
Revenues from product sales and services |  | $ | — |  |  | $ | 11.3 |  |  | $ | 563.5 |
Cost of goods sold and operating expenses |  | — |  |  | (11.1 | ) |  | (808.4 | )
Eliminations with continuing operations |  | — |  |  | — |  |  | (53.6 | )
Sales margin |  | — |  |  | 0.2 |  |  | (298.5 | )
Other operating expense |  | — |  |  | (33.8 | ) |  | (306.3 | )
Other expense |  | — |  |  | (1.0 | ) |  | (5.6 | )
Loss from discontinued operations before income taxes |  | — |  |  | (34.6 | ) |  | (610.4 | )
Loss from deconsolidation |  | (17.5 | ) |  | (710.9 | ) |  | — |
Impairment of long-lived assets |  | — |  |  | — |  |  | (7,536.8 | )
Income tax benefit |  | — |  |  | 5.8 |  |  | 913.7 |
Loss from discontinued operations, net of tax |  | $ | (17.5 | ) |  | $ | (739.7 | ) |  | $ | (7,233.5 | )
PreTax Exit Costs [Table Text Block] | Canadian Entities loss from deconsolidation totaled $17.5 million and $710.9 million for the year ended December 31, 2016 and 2015, respectively and included the following:
|  | (In Millions)
|  | Year Ended December 31, |  | Year Ended December 31,
|  | 2016 |  | 2015
Investment impairment on deconsolidation 1 |  | $ | (17.5 | ) |  | $ | (507.8 | )
Guarantees and contingent liabilities |  | — |  |  | (203.1 | )
Total loss from deconsolidation |  | $ | (17.5 | ) |  | $ | (710.9 | )
1 Includes the adjustment to fair value of our remaining interest in the Canadian Entities.
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Table Text Block] | Items Measured at Fair Value on a Non-Recurring Basis The following table presents information about the financial assets and liabilities that were measured on a fair value basis at December 31, 2016 and 2015 for the Canadian Entities. The table also indicates the fair value hierarchy of the valuation techniques used to determine such fair value.
|  | (In Millions)
|  | December 31, 2016
Description |  | Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total |  | Total Losses
Assets: |  |  |  |  |  |  |  |  |  |
Loans to and accounts receivables from the Canadian Entities |  | $ | — |  |  | $ | — |  |  | $ | 48.6 |  |  | $ | 48.6 |  |  | $ | 17.5 |
Liabilities: |  |  |  |  |  |  |  |  |  |
Guarantees and contingent liabilities |  | $ | — |  |  | $ | — |  |  | $ | 37.2 |  |  | $ | 37.2 |  |  | $ | — |
|  | (In Millions)
|  | December 31, 2015
Description |  | Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total |  | Total Losses
Assets: |  |  |  |  |  |  |  |  |  |
Loans to and accounts receivables from the Canadian Entities |  | $ | — |  |  | $ | — |  |  | $ | 72.9 |  |  | $ | 72.9 |  |  | $ | 507.8 |
Liabilities: |  |  |  |  |  |  |  |  |  |
Guarantees and contingent liabilities |  | $ | — |  |  | $ | — |  |  | $ | 132.4 |  |  | $ | 132.4 |  |  | $ | 203.1 |

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