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ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Tables) | 9 Months Ended
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Sep. 30, 2018
Environmental Remediation Obligations [Abstract] |
Summary Of Mine Closure Obligations | The following is a summary of the obligations:
| (In Millions)
| September 30, 2018 |  | December 31, 2017
Environmental | $ | 2.7 |  |  | $ | 2.9 |
Mine closure 1 | 174.6 |  |  | 168.4 |
Total environmental and mine closure obligations | 177.3 |  |  | 171.3 |
Less current portion | 2.9 |  |  | 3.6 |
Long-term environmental and mine closure obligations | $ | 174.4 |  |  | $ | 167.7 |
1 Includes our active operating mines, our indefinitely idled Empire mine and a closed mine formerly operating as LTVSMC.
Asset Retirement Obligation Disclosure | The following represents a roll forward of our mine closure obligation liability for the nine months ended September 30, 2018 and for the year ended December 31, 2017:
| (In Millions)
| September 30, 2018 |  | December 31, 2017
Mine closure obligation at beginning of period | $ | 168.4 |  |  | $ | 187.8 |
Accretion expense | 7.1 |  |  | 13.9 |
Remediation payments | (0.9 | ) |  | (5.6 | )
Revision in estimated cash flows | — |  |  | (27.7 | )
Mine closure obligation at end of period | $ | 174.6 |  |  | $ | 168.4 |

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