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ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Tables) | 9 Months Ended
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Sep. 30, 2019
Environmental Remediation Obligations [Abstract] |
Summary Of Mine Closure Obligations | The following is a summary of our environmental and mine closure obligations:
| (In Millions)
| September 30, 2019 |  | December 31, 2018
Environmental | $ | 2.1 |  |  | $ | 2.5 |
Mine closure 1 | 179.5 |  |  | 172.4 |
Total environmental and mine closure obligations | 181.6 |  |  | 174.9 |
Less current portion | 2.5 |  |  | 2.9 |
Long-term environmental and mine closure obligations | $ | 179.1 |  |  | $ | 172.0 |
1 Includes our active operating mines, our indefinitely idled Empire mine and a closed mine formerly operating as LTV Steel Mining Company.
Asset Retirement Obligation Disclosure | The following is a roll forward of our mine closure obligation liability:
| (In Millions)
| Nine Months Ended September 30, 2019 |  | Year Ended December 31, 2018
Asset retirement obligation at beginning of period | $ | 172.4 |  |  | $ | 168.4 |
Accretion expense | 7.6 |  |  | 9.5 |
Remediation payments | (0.5 | ) |  | (1.0 | )
Revision in estimated cash flows | — |  |  | (4.5 | )
Asset retirement obligation at end of period | $ | 179.5 |  |  | $ | 172.4 |

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