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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2015
Income Tax Contingency [Line Items] |
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] | Income (Loss) from Continuing Operations Before Income Taxes and Equity Loss from Ventures includes the following components:
|  | (In Millions)
|  | 2015 |  | 2014 |  | 2013
United States |  | $ | 314.2 |  |  | $ | (447.5 | ) |  | $ | 840.8 |
Foreign |  | (1.1 | ) |  | 427.8 |  |  | 350.1 |
|  | $ | 313.1 |  |  | $ | (19.7 | ) |  | $ | 1,190.9 |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | The components of the provision (benefit) for income taxes on continuing operations consist of the following:
|  | (In Millions)
|  | 2015 |  | 2014 |  | 2013
Current provision (benefit): |  |  |  |  |  |
United States federal |  | $ | 8.2 |  |  | $ | (125.2 | ) |  | $ | 110.4 |
United States state & local |  | 0.3 |  |  | (0.6 | ) |  | 4.0 |
Foreign |  | 0.9 |  |  | 11.7 |  |  | 94.8 |
|  | 9.4 |  |  | (114.1 | ) |  | 209.2 |
Deferred provision (benefit): |  |  |  |  |  |
United States federal |  | 165.8 |  |  | 20.4 |  |  | 35.0 |
United States state & local |  | — |  |  | (24.9 | ) |  | 3.0 |
Foreign |  | (5.9 | ) |  | 32.6 |  |  | (9.6 | )
|  | 159.9 |  |  | 28.1 |  |  | 28.4 |
Total provision on income (loss) from continuing operations |  | $ | 169.3 |  |  | $ | (86.0 | ) |  | $ | 237.6 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | Reconciliation of our income tax attributable to continuing operations computed at the U.S. federal statutory rate is as follows:
|  | (In Millions)
|  | 2015 |  | 2014 |  | 2013
Tax at U.S. statutory rate of 35 percent |  | $ | 109.6 |  |  | 35.0 | % |  | $ | (6.9 | ) |  | 35.0 | % |  | $ | 416.8 |  |  | 35.0 | %
Increase (decrease) due to: |  |  |  |  |  |  |  |  |  |  |  |
Non-taxable income related to noncontrolling interests |  | (3.0 | ) |  | (1.0 | ) |  | (9.4 | ) |  | 47.7 |  |  | (5.4 | ) |  | (0.5 | )
Impact of tax law change |  | — |  |  | — |  |  | 13.0 |  |  | (66.0 | ) |  | — |  |  | — |
Percentage depletion in excess of cost depletion |  | (34.9 | ) |  | (11.1 | ) |  | (87.9 | ) |  | 446.2 |  |  | (97.6 | ) |  | (8.2 | )
Impact of foreign operations |  | (53.9 | ) |  | (17.2 | ) |  | 51.4 |  |  | (260.9 | ) |  | (48.7 | ) |  | (4.1 | )
Income not subject to tax |  | — |  |  | — |  |  | (27.7 | ) |  | 140.6 |  |  | (84.7 | ) |  | (7.1 | )
Goodwill impairment |  | — |  |  | — |  |  | 22.7 |  |  | (115.2 | ) |  | — |  |  | — |
State taxes, net |  | 0.2 |  |  | 0.1 |  |  | (25.4 | ) |  | 128.9 |  |  | 5.6 |  |  | 0.5 |
Settlement of financial guaranty |  | — |  |  | — |  |  | (347.1 | ) |  | 1,761.9 |  |  | — |  |  | — |
Valuation allowance - current year |  | (104.6 | ) |  | (33.4 | ) |  | 318.3 |  |  | (1,615.7 | ) |  | 53.2 |  |  | 4.5 |
Valuation allowance on tax benefits - prior |  | 165.8 |  |  | 52.9 |  |  | 15.2 |  |  | (77.2 | ) |  | — |  |  | — |
Tax uncertainties |  | 84.1 |  |  | 26.9 |  |  | — |  |  | — |  |  | 12.5 |  |  | 1.1 |
Prior year adjustment in current year |  | 5.9 |  |  | 1.9 |  |  | (6.3 | ) |  | 32.1 |  |  | 4.9 |  |  | 0.4 |
Other items — net |  | 0.1 |  |  | — |  |  | 4.1 |  |  | (20.9 | ) |  | (19.0 | ) |  | (1.6 | )
Income tax (benefit) expense |  | $ | 169.3 |  |  | 54.1 | % |  | $ | (86.0 | ) |  | 436.5 | % |  | $ | 237.6 |  |  | 20.0 | %
Income Taxes Other Than Continuing Operations Disclosure Text Block [Table Text Block] | The components of income taxes for other than continuing operations consisted of the following:
|  | (In Millions)
|  | 2015 |  | 2014 |  | 2013
Other comprehensive (income) loss: |  |  |  |  |  |
Pension/OPEB liability |  | $ | — |  |  | $ | 37.1 |  |  | $ | 83.2 |
Mark-to-market adjustments |  | 0.3 |  |  | 3.6 |  |  | 1.8 |
Other |  | 5.9 |  |  | 0.2 |  |  | (9.8 | )
Total |  | $ | 6.2 |  |  | $ | 40.9 |  |  | $ | 75.2 |
Paid in capital — stock based compensation |  | $ | — |  |  | $ | (4.8 | ) |  | $ | 3.5 |
Discontinued Operations |  | $ | (6.0 | ) |  | $ | (1,216.0 | ) |  | $ | (184.5 | )
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | Significant components of our deferred tax assets and liabilities as of December 31, 2015 and 2014 are as follows:
|  | (In Millions)
|  | 2015 |  | 2014
Deferred tax assets: |  |  |  |
Pensions |  | $ | 106.6 |  |  | $ | 99.5 |
Postretirement benefits other than pensions |  | 36.5 |  |  | 50.4 |
Alternative minimum tax credit carryforwards |  | 218.7 |  |  | 219.1 |
Investments in ventures |  | 4.9 |  |  | — |
Asset retirement obligations |  | 5.3 |  |  | 29.4 |
Operating loss carryforwards |  | 2,791.6 |  |  | 679.0 |
Product inventories |  | 57.2 |  |  | 25.6 |
Property, plant and equipment and mineral rights |  | 189.8 |  |  | 337.8 |
State and local |  | 59.9 |  |  | 41.9 |
Lease liabilities |  | 18.3 |  |  | 14.1 |
Other liabilities |  | 148.9 |  |  | 95.6 |
Total deferred tax assets before valuation allowance |  | 3,637.7 |  |  | 1,592.4 |
Deferred tax asset valuation allowance |  | (3,372.5 | ) |  | (1,152.3 | )
Net deferred tax assets |  | 265.2 |  |  | 440.1 |
Deferred tax liabilities: |  |  |  |
Property, plant and equipment and mineral rights |  | (35.5 | ) |  | — |
Investment in ventures |  | (206.6 | ) |  | (198.0 | )
Intangible assets |  | (1.5 | ) |  | (7.3 | )
Product inventories |  | (2.5 | ) |  | (3.1 | )
Other assets |  | (19.1 | ) |  | (65.9 | )
Total deferred tax liabilities |  | (265.2 | ) |  | (274.3 | )
Net deferred tax assets (liabilities) |  | $ | — |  |  | $ | 165.8 |
Deferred Tax Assets and Liabilities by Location [Table Text Block] |
|  | (In Millions)
|  | 2015 |  | 2014
Deferred tax assets: |  |  |  |
United States |  | $ | — |  |  | $ | 165.8 |
Foreign |  | — |  |  | 9.7 |
Total deferred tax assets |  | — |  |  | 175.5 |
Deferred tax liabilities: |  |  |  |
United States |  | — |  |  | — |
Foreign |  | — |  |  | 9.7 |
Total deferred tax liabilities |  | — |  |  | 9.7 |
Net deferred tax assets (liabilities) |  | $ | — |  |  | $ | 165.8 |
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] | A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:
|  | (In Millions)
|  | 2015 |  | 2014 |  | 2013
Unrecognized tax benefits balance as of January 1 |  | $ | 72.6 |  |  | $ | 71.8 |  |  | $ | 53.5 |
Increases for tax positions in prior years |  | 6.7 |  |  | — |  |  | 13.0 |
Increases for tax positions in current year |  | 78.5 |  |  | 5.9 |  |  | 5.3 |
Increase due to foreign exchange |  | — |  |  | (0.2 | ) |  | — |
Settlements |  | (1.1 | ) |  | — |  |  | — |
Lapses in statutes of limitations |  | (0.5 | ) |  | (3.7 | ) |  | — |
Other |  | — |  |  | (1.2 | ) |  | — |
Unrecognized tax benefits balance as of December 31 |  | $ | 156.2 |  |  | $ | 72.6 |  |  | $ | 71.8 |

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