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ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Tables) | 6 Months Ended
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Jun. 30, 2018
Environmental Remediation Obligations [Abstract] |
Summary Of Mine Closure Obligations | The following is a summary of the obligations:
| (In Millions)
| June 30, 2018 |  | December 31, 2017
Environmental | $ | 3.2 |  |  | $ | 2.9 |
Mine closure 1 | 172.8 |  |  | 168.4 |
Total environmental and mine closure obligations | 176.0 |  |  | 171.3 |
Less current portion | 3.7 |  |  | 3.6 |
Long-term environmental and mine closure obligations | $ | 172.3 |  |  | $ | 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 six months ended June 30, 2018 and for the year ended December 31, 2017:
| (In Millions)
| June 30, 2018 |  | December 31, 2017
Mine closure obligation at beginning of period | $ | 168.4 |  |  | $ | 187.8 |
Accretion expense | 4.7 |  |  | 13.9 |
Remediation payments | (0.3 | ) |  | (5.6 | )
Revision in estimated cash flows | — |  |  | (27.7 | )
Mine closure obligation at end of period | $ | 172.8 |  |  | $ | 168.4 |

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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