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ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS | 6 Months Ended
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Jun. 30, 2018
Environmental Remediation Obligations [Abstract] |
ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS | NOTE 13 - ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS We had environmental and mine closure liabilities of $176.0 million and $171.3 million at June 30, 2018 and December 31, 2017, respectively. 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.
Mine Closure The accrued mine closure obligation for our active mining operations provides for contractual and legal obligations associated with the eventual closure of the mining operations. The accretion of the liability and amortization of the related asset is recognized over the estimated mine lives for each location. 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 |
For the year ended December 31, 2017, the revision in estimated cash flows relates primarily to updates to our estimates resulting from our three-year in-depth review of our mine closure obligations for each of our U.S. mines. The primary driver of the decrease in estimated cash flows was the Empire mine, as the mine closure obligation was reduced by $26.2 million as a result of the refinement of the cash flows required for reclamation, remediation and structural removal. Prior estimates were based on RS Means (a common costing methodology used in the construction and demolition industry) average costing data while the current estimate was compiled using a more detailed cost build-up approach.

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- Definition The entire disclosure for environmental loss contingencies, such as presence of hazardous waste, relevant information from reports issued by regulators, and estimated costs to achieve compliance with regulatory requirements. This element may be used for all of an entity's disclosures about environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -URI http://asc.fasb.org/subtopic&trid=2175709 + Details
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