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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Tax Contingency [Line Items] |
Summary of Valuation Allowance [Table Text Block] | The changes in the valuation allowance are presented below:
|  | (In Millions)
|  | 2019 |  | 2018 |  | 2017
Balance at beginning of year |  | $ | 1,287.3 |  |  | $ | 1,983.1 |  |  | $ | 3,095.1 |
Change in valuation allowance: |  |  |  |  |  |
Included in income tax expense (benefit) |  | (846.0 | ) |  | (691.3 | ) |  | (1,120.0 | )
Change in deferred assets in other comprehensive income |  | — |  |  | (4.5 | ) |  | (9.8 | )
Acquisition of noncontrolling interest |  | — |  |  | — |  |  | 17.8 |
Balance at end of year |  | $ | 441.3 |  |  | $ | 1,287.3 |  |  | $ | 1,983.1 |
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)
|  | 2019 |  | 2018 |  | 2017
United States |  | $ | 311.9 |  |  | $ | 565.0 |  |  | $ | 90.7 |
Foreign |  | 0.2 |  |  | (0.3 | ) |  | 17.5 |
|  | $ | 312.1 |  |  | $ | 564.7 |  |  | $ | 108.2 |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | The components of the income tax provision (benefit) on continuing operations consist of the following:
|  | (In Millions)
|  | 2019 |  | 2018 |  | 2017
Current provision (benefit): |  |  |  |  |  |
United States federal |  | $ | (0.7 | ) |  | $ | (0.5 | ) |  | $ | (252.6 | )
United States state & local |  | 0.1 |  |  | — |  |  | (0.1 | )
Foreign |  | 0.2 |  |  | 0.7 |  |  | 0.3 |
|  | (0.4 | ) |  | 0.2 |  |  | (252.4 | )
Deferred provision (benefit): |  |  |  |  |  |
United States federal |  | 18.0 |  |  | (475.4 | ) |  | — |
Total income tax provision (benefit) from continuing operations |  | $ | 17.6 |  |  | $ | (475.2 | ) |  | $ | (252.4 | )
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)
|  | 2019 |  | 2018 |  | 2017
Tax at U.S. statutory rate |  | $ | 65.5 |  |  | 21.0 | % |  | $ | 118.6 |  |  | 21.0 | % |  | $ | 37.9 |  |  | 35.0 | %
Increase (decrease) due to: |  |  |  |  |  |  |  |  |  |  |  |
Percentage depletion in excess of cost depletion |  | (49.3 | ) |  | (15.8 | ) |  | (54.6 | ) |  | (9.7 | ) |  | (61.6 | ) |  | (56.9 | )
Impact of tax law change - remeasurement of deferred taxes |  | — |  |  | — |  |  | — |  |  | — |  |  | 407.5 |  |  | 376.6 |
Luxembourg legal entity reduction |  | 846.0 |  |  | 271.1 |  |  | 161.7 |  |  | 28.6 |  |  | — |  |  | — |
Valuation allowance release: |  |  |  |  |  |  |  |  |  |  |  |
Tax law change - remeasurement of deferred taxes |  | — |  |  | — |  |  | — |  |  | — |  |  | (407.5 | ) |  | (376.6 | )
Current year activity |  | — |  |  | — |  |  | (79.6 | ) |  | (14.1 | ) |  | (469.8 | ) |  | (434.2 | )
Release of U.S. valuation allowance |  | — |  |  | — |  |  | (460.5 | ) |  | (81.5 | ) |  | — |  |  | — |
Repeal of AMT |  | — |  |  | — |  |  | — |  |  | — |  |  | (235.3 | ) |  | (217.5 | )
Luxembourg legal entity reduction |  | (846.0 | ) |  | (271.1 | ) |  | (161.7 | ) |  | (28.6 | ) |  | — |  |  | — |
Impact of foreign operations |  | 0.2 |  |  | 0.1 |  |  | 0.1 |  |  | — |  |  | 477.9 |  |  | 441.7 |
Other items, net |  | 1.2 |  |  | 0.4 |  |  | 0.8 |  |  | 0.2 |  |  | (1.5 | ) |  | (1.4 | )
Provision for income tax expense (benefit) and effective income tax rate including discrete items |  | $ | 17.6 |  |  | 5.7 | % |  | $ | (475.2 | ) |  | (84.1 | )% |  | $ | (252.4 | ) |  | (233.3 | )%
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)
|  | 2019 |  | 2018 |  | 2017
Other comprehensive income: |  |  |  |  |  |
Postretirement benefit liability |  | $ | 11.4 |  |  | $ | 3.6 |  |  | $ | — |
Unrealized net loss on derivative financial instruments |  | 0.1 |  |  | 0.7 |  |  | — |
Total |  | $ | 11.5 |  |  | $ | 4.3 |  |  | $ | — |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | Significant components of our deferred tax assets and liabilities are as follows:
|  | (In Millions)
|  | 2019 |  | 2018
Deferred tax assets: |  |  |  |
Operating loss & other carryforwards |  | $ | 794.9 |  |  | $ | 2,118.8 |
Pension and OPEB liabilities |  | 113.7 |  |  | 102.8 |
Deferred income |  | 25.2 |  |  | 23.3 |
Property, plant and equipment and mineral rights |  | 1.4 |  |  | 13.3 |
State and local |  | 71.0 |  |  | 68.2 |
Other liabilities |  | 45.1 |  |  | 48.4 |
Total deferred tax assets before valuation allowance |  | 1,051.3 |  |  | 2,374.8 |
Deferred tax asset valuation allowance |  | (441.3 | ) |  | (1,287.3 | )
Net deferred tax assets |  | 610.0 |  |  | 1,087.5 |
Deferred tax liabilities: |  |  |  |
Investment in partnerships |  | (136.8 | ) |  | (141.2 | )
Intercompany notes |  | — |  |  | (465.7 | )
Other assets |  | (13.7 | ) |  | (15.8 | )
Total deferred tax liabilities |  | (150.5 | ) |  | (622.7 | )
Net deferred tax assets |  | $ | 459.5 |  |  | $ | 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)
|  | 2019 |  | 2018 |  | 2017
Unrecognized tax benefits balance as of January 1 |  | $ | 29.0 |  |  | $ | 33.5 |  |  | $ | 30.7 |
Increase (decrease) for tax positions in prior years |  | 0.2 |  |  | 0.1 |  |  | (2.8 | )
Increase for tax positions in current year |  | — |  |  | 3.6 |  |  | 4.5 |
Settlements |  | — |  |  | — |  |  | 1.0 |
Lapses in statutes of limitations |  | — |  |  | (8.2 | ) |  | — |
Other |  | — |  |  | — |  |  | 0.1 |
Unrecognized tax benefits balance as of December 31 |  | $ | 29.2 |  |  | $ | 29.0 |  |  | $ | 33.5 |

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