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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Contingency [Line Items] |
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] | Income from continuing operations before income taxes and equity loss from ventures includes the following components:
|  | (In Millions)
|  | 2017 |  | 2016 |  | 2015
United States |  | $ | 90.7 |  |  | $ | 124.9 |  |  | $ | 314.2 |
Foreign |  | 38.7 |  |  | 82.1 |  |  | (1.1 | )
|  | $ | 129.4 |  |  | $ | 207.0 |  |  | $ | 313.1 |
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)
|  | 2017 |  | 2016 |  | 2015
Current provision (benefit): |  |  |  |  |  |
United States federal |  | $ | (252.6 | ) |  | $ | (11.1 | ) |  | $ | 8.2 |
United States state & local |  | (0.1 | ) |  | (0.5 | ) |  | 0.3 |
Foreign |  | 0.3 |  |  | (0.1 | ) |  | 0.9 |
|  | (252.4 | ) |  | (11.7 | ) |  | 9.4 |
Deferred provision (benefit): |  |  |  |  |  |
United States federal |  | — |  |  | (0.5 | ) |  | 165.8 |
Foreign |  | — |  |  | — |  |  | (5.9 | )
|  | — |  |  | (0.5 | ) |  | 159.9 |
Total provision (benefit) on income from continuing operations |  | $ | (252.4 | ) |  | $ | (12.2 | ) |  | $ | 169.3 |
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)
|  | 2017 |  | 2016 |  | 2015
Tax at U.S. statutory rate of 35% |  | $ | 45.3 |  |  | 35.0 | % |  | $ | 72.5 |  |  | 35.0 | % |  | $ | 109.6 |  |  | 35.0 | %
Increase (decrease) due to: |  |  |  |  |  |  |  |  |  |  |  |
Impact of tax law change - remeasurement of deferred taxes |  | 407.5 |  |  | 314.8 |  |  | 149.1 |  |  | 72.0 |  |  | — |  |  | — |
Prior year adjustments in current year |  | (1.1 | ) |  | (0.8 | ) |  | (11.8 | ) |  | (5.7 | ) |  | 5.9 |  |  | 1.9 |
Valuation allowance build (reversal) |  |  |  |  |  |  |  |  |  |  |  |
Tax law change - remeasurement of deferred taxes |  | (407.5 | ) |  | (314.8 | ) |  | (149.1 | ) |  | (72.0 | ) |  | — |  |  | — |
Current year activity |  | (471.7 | ) |  | (364.4 | ) |  | 93.9 |  |  | 45.4 |  |  | (104.6 | ) |  | (33.4 | )
Repeal of AMT |  | (235.3 | ) |  | (181.7 | ) |  | — |  |  | — |  |  | — |  |  | — |
Prior year adjustments in current year |  | (3.0 | ) |  | (2.4 | ) |  | 6.5 |  |  | 3.1 |  |  | 165.8 |  |  | 52.9 |
Tax uncertainties |  | (1.4 | ) |  | (1.1 | ) |  | (11.3 | ) |  | (5.5 | ) |  | 84.1 |  |  | 26.9 |
Worthless stock deduction |  | — |  |  | — |  |  | (73.4 | ) |  | (35.5 | ) |  | — |  |  | — |
Impact of foreign operations |  | 475.4 |  |  | 367.2 |  |  | (42.7 | ) |  | (20.6 | ) |  | (53.9 | ) |  | (17.2 | )
Percentage depletion in excess of cost depletion |  | (61.6 | ) |  | (47.6 | ) |  | (36.1 | ) |  | (17.4 | ) |  | (34.9 | ) |  | (11.1 | )
Non-taxable loss (income) related to noncontrolling interests |  | 1.3 |  |  | 1.0 |  |  | (8.8 | ) |  | (4.2 | ) |  | (3.0 | ) |  | (1.0 | )
State taxes, net |  | (0.1 | ) |  | — |  |  | 0.4 |  |  | 0.2 |  |  | 0.2 |  |  | 0.1 |
Other items, net |  | (0.2 | ) |  | (0.2 | ) |  | (1.4 | ) |  | (0.7 | ) |  | 0.1 |  |  | — |
Provision for income tax (benefit) expense and effective income tax rate including discrete items |  | $ | (252.4 | ) |  | (195.0 | )% |  | $ | (12.2 | ) |  | (5.9 | )% |  | $ | 169.3 |  |  | 54.1 | %
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)
|  | 2017 |  | 2016 |  | 2015
Other comprehensive (income) loss: |  |  |  |  |  |
Postretirement benefit liability |  | $ | — |  |  | $ | — |  |  | $ | 5.9 |
Mark-to-market adjustments |  | — |  |  | — |  |  | 0.3 |
Other |  | — |  |  | 0.5 |  |  | — |
Total |  | $ | — |  |  | $ | 0.5 |  |  | $ | 6.2 |
Discontinued Operations |  | $ | — |  |  | $ | — |  |  | $ | (6.0 | )
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | Significant components of our deferred tax assets and liabilities as of December 31, 2017 and 2016 are as follows:
|  | (In Millions)
|  | 2017 |  | 2016
Deferred tax assets: |  |  |  |
Pensions |  | $ | 76.3 |  |  | $ | 114.6 |
Postretirement benefits other than pensions |  | 25.6 |  |  | 35.2 |
Alternative minimum tax credit carryforwards |  | — |  |  | 251.2 |
Deferred income |  | 24.2 |  |  | 44.5 |
Intangible assets |  | 12.2 |  |  | — |
Financial instruments |  | — |  |  | 71.3 |
Asset retirement obligations |  | 9.9 |  |  | 22.3 |
Operating loss carryforwards |  | 2,368.1 |  |  | 2,699.7 |
Property, plant and equipment and mineral rights |  | 188.2 |  |  | 181.2 |
State and local |  | 74.2 |  |  | 59.2 |
Lease liabilities |  | 9.6 |  |  | 12.9 |
Other liabilities |  | 100.4 |  |  | 108.3 |
Total deferred tax assets before valuation allowance |  | 2,888.7 |  |  | 3,600.4 |
Deferred tax asset valuation allowance |  | (2,238.5 | ) |  | (3,334.8 | )
Net deferred tax assets |  | 650.2 |  |  | 265.6 |
Deferred tax liabilities: |  |  |  |
Property, plant and equipment and mineral rights |  | (1.5 | ) |  | (34.0 | )
Investment in ventures |  | (137.5 | ) |  | (203.1 | )
Intangible assets |  | — |  |  | (1.0 | )
Product inventories |  | (3.8 | ) |  | (3.4 | )
Intercompany notes |  | (465.7 | ) |  | — |
Other assets |  | (41.7 | ) |  | (24.1 | )
Total deferred tax liabilities |  | (650.2 | ) |  | (265.6 | )
Net deferred tax assets (liabilities) |  | $ | — |  |  | $ | — |
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)
|  | 2017 |  | 2016 |  | 2015
Unrecognized tax benefits balance as of January 1 |  | $ | 30.7 |  |  | $ | 156.2 |  |  | $ | 72.6 |
Increase (decrease) for tax positions in prior years |  | (2.8 | ) |  | (61.0 | ) |  | 6.7 |
Increase for tax positions in current year |  | 4.5 |  |  | 0.2 |  |  | 78.5 |
Decrease due to foreign exchange |  | — |  |  | — |  |  | — |
Settlements |  | 1.0 |  |  | (64.7 | ) |  | (1.1 | )
Lapses in statutes of limitations |  | — |  |  | — |  |  | (0.5 | )
Other |  | 0.1 |  |  | — |  |  | — |
Unrecognized tax benefits balance as of December 31 |  | $ | 33.5 |  |  | $ | 30.7 |  |  | $ | 156.2 |

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