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ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Tables) | 12 Months Ended
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Dec. 31, 2019
Environmental Remediation Obligations [Abstract] |
Schedule of Environmental Loss Contingencies and Asset Retirement Obligations [Table Text Block] | The following is a summary of our environmental and mine closure obligations:
| (In Millions)
| December 31,
| 2019 |  | 2018
Environmental | $ | 2.0 |  |  | $ | 2.5 |
Mine closure 1 | 165.3 |  |  | 172.4 |
Total environmental and mine closure obligations | 167.3 |  |  | 174.9 |
Less current portion | 2.4 |  |  | 2.9 |
Long-term environmental and mine closure obligations | $ | 164.9 |  |  | $ | 172.0 |
1 Includes $22.0 million and $35.0 million related to our active operations as of December 31, 2019 and 2018, respectively, with the remaining balance attributable to inactive operations, including our indefinitely idled Empire mine and a closed mine formerly operating as LTV Steel Mining Company.
Asset Retirement Obligations | The following represents a roll forward of our asset retirement obligation liability:
| (In Millions)
| December 31,
| 2019 |  | 2018
Asset retirement obligation at beginning of year | $ | 172.4 |  |  | $ | 168.4 |
Accretion expense | 10.1 |  |  | 9.5 |
Remediation payments | (0.8 | ) |  | (1.0 | )
Revision in estimated cash flows | (16.4 | ) |  | (4.5 | )
Asset retirement obligation at end of year | $ | 165.3 |  |  | $ | 172.4 |

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