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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2018
Income Tax Contingency [Line Items] |
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] | Income from continuing operations before income taxes includes the following components:
|  | (In Millions)
|  | 2018 |  | 2017 |  | 2016
United States |  | $ | 565.0 |  |  | $ | 90.7 |  |  | $ | 124.9 |
Foreign |  | (0.3 | ) |  | 17.5 |  |  | (14.5 | )
|  | $ | 564.7 |  |  | $ | 108.2 |  |  | $ | 110.4 |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | The components of the income tax benefit on continuing operations consist of the following:
|  | (In Millions)
|  | 2018 |  | 2017 |  | 2016
Current provision (benefit): |  |  |  |  |  |
United States federal |  | $ | (0.5 | ) |  | $ | (252.6 | ) |  | $ | (11.1 | )
United States state & local |  | — |  |  | (0.1 | ) |  | (0.5 | )
Foreign |  | 0.7 |  |  | 0.3 |  |  | (0.1 | )
|  | 0.2 |  |  | (252.4 | ) |  | (11.7 | )
Deferred benefit: |  |  |  |  |  |
United States federal |  | (475.4 | ) |  | — |  |  | (0.5 | )
Total income tax benefit from continuing operations |  | $ | (475.2 | ) |  | $ | (252.4 | ) |  | $ | (12.2 | )
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)
|  | 2018 |  | 2017 |  | 2016
Tax at U.S. statutory rate |  | $ | 118.6 |  |  | 21.0 | % |  | $ | 37.9 |  |  | 35.0 | % |  | $ | 38.6 |  |  | 35.0 | %
Increase (decrease) due to: |  |  |  |  |  |  |  |  |  |  |  |
Percentage depletion in excess of cost depletion |  | (54.6 | ) |  | (9.7 | ) |  | (61.6 | ) |  | (56.9 | ) |  | (36.1 | ) |  | (32.7 | )
Impact of tax law change - remeasurement of deferred taxes |  | — |  |  | — |  |  | 407.5 |  |  | 376.6 |  |  | 149.1 |  |  | 135.1 |
Dissolution of Luxembourg entities |  | 161.7 |  |  | 28.6 |  |  | — |  |  | — |  |  | — |  |  | — |
Prior year adjustments in current year |  | (1.0 | ) |  | (0.2 | ) |  | (1.1 | ) |  | (1.0 | ) |  | (11.8 | ) |  | (10.7 | )
Valuation allowance build (reversal): |  |  |  |  |  |  |  |  |  |  |  |
Tax law change - remeasurement of deferred taxes |  | — |  |  | — |  |  | (407.5 | ) |  | (376.6 | ) |  | (149.1 | ) |  | (135.1 | )
Current year activity |  | (80.6 | ) |  | (14.3 | ) |  | (466.3 | ) |  | (431.0 | ) |  | 122.9 |  |  | 111.3 |
Release of U.S. valuation allowance |  | (460.5 | ) |  | (81.5 | ) |  | — |  |  | — |  |  | — |  |  | — |
Repeal of AMT |  | — |  |  | — |  |  | (235.3 | ) |  | (217.5 | ) |  | — |  |  | — |
Dissolution of Luxembourg entities |  | (161.7 | ) |  | (28.6 | ) |  | — |  |  | — |  |  | — |  |  | — |
Prior year adjustments in current year |  | 1.0 |  |  | 0.2 |  |  | (3.5 | ) |  | (3.2 | ) |  | 9.3 |  |  | 8.4 |
Tax uncertainties |  | (1.3 | ) |  | (0.2 | ) |  | (1.4 | ) |  | (1.3 | ) |  | (11.3 | ) |  | (10.2 | )
Worthless stock deduction |  | — |  |  | — |  |  | — |  |  | — |  |  | (73.4 | ) |  | (66.5 | )
Impact of foreign operations |  | 0.1 |  |  | — |  |  | 477.9 |  |  | 441.7 |  |  | (40.6 | ) |  | (36.8 | )
Other items, net |  | 3.1 |  |  | 0.6 |  |  | 1.0 |  |  | 0.9 |  |  | (9.8 | ) |  | (8.9 | )
Provision for income tax benefit and effective income tax rate including discrete items |  | $ | (475.2 | ) |  | (84.1 | )% |  | $ | (252.4 | ) |  | (233.3 | )% |  | $ | (12.2 | ) |  | (11.1 | )%
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)
|  | 2018 |  | 2017 |  | 2016
Other comprehensive (income) loss: |  |  |  |  |  |
Postretirement benefit liability |  | $ | 3.6 |  |  | $ | — |  |  | $ | — |
Unrealized net loss on derivative financial instruments |  | 0.7 |  |  | — |  |  | — |
Other |  | — |  |  | — |  |  | 0.5 |
Total |  | $ | 4.3 |  |  | $ | — |  |  | $ | 0.5 |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | Significant components of our deferred tax assets and liabilities are as follows:
|  | (In Millions)
|  | 2018 |  | 2017
Deferred tax assets: |  |  |  |
Operating loss carryforwards |  | $ | 2,118.8 |  |  | $ | 2,362.4 |
Pensions |  | 77.5 |  |  | 76.3 |
OPEB |  | 25.3 |  |  | 25.6 |
Deferred income |  | 23.3 |  |  | 24.2 |
Intangible assets |  | 11.6 |  |  | 13.0 |
Property, plant and equipment and mineral rights |  | 13.3 |  |  | — |
State and local |  | 68.2 |  |  | 74.2 |
Other liabilities |  | 36.8 |  |  | 30.4 |
Total deferred tax assets before valuation allowance |  | 2,374.8 |  |  | 2,606.1 |
Deferred tax asset valuation allowance |  | (1,287.3 | ) |  | (1,983.1 | )
Net deferred tax assets |  | 1,087.5 |  |  | 623.0 |
Deferred tax liabilities: |  |  |  |
Property, plant and equipment and mineral rights |  | — |  |  | (1.5 | )
Investment in ventures |  | (141.2 | ) |  | (137.5 | )
Intercompany notes |  | (465.7 | ) |  | (465.7 | )
Other assets |  | (15.8 | ) |  | (18.3 | )
Total deferred tax liabilities |  | (622.7 | ) |  | (623.0 | )
Net deferred tax assets |  | $ | 464.8 |  |  | $ | — |
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)
|  | 2018 |  | 2017 |  | 2016
Unrecognized tax benefits balance as of January 1 |  | $ | 33.5 |  |  | $ | 30.7 |  |  | $ | 156.2 |
Increase (decrease) for tax positions in prior years |  | 0.1 |  |  | (2.8 | ) |  | (61.0 | )
Increase for tax positions in current year |  | 3.6 |  |  | 4.5 |  |  | 0.2 |
Settlements |  | — |  |  | 1.0 |  |  | (64.7 | )
Lapses in statutes of limitations |  | (8.2 | ) |  | — |  |  | — |
Other |  | — |  |  | 0.1 |  |  | — |
Unrecognized tax benefits balance as of December 31 |  | $ | 29.0 |  |  | $ | 33.5 |  |  | $ | 30.7 |

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