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ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS | 6 Months Ended
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Jun. 30, 2016
Environmental Remediation Obligations [Abstract] |
ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS | NOTE 11 - ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS We had environmental and mine closure liabilities of $220.0 million and $234.0 million at June 30, 2016 and December 31, 2015, respectively. The following is a summary of the obligations as of June 30, 2016 and December 31, 2015:
| (In Millions)
| June 30, 2016 |  | December 31, 2015
Environmental | $ | 3.5 |  |  | $ | 3.6 |
Mine closure |  |  |
LTVSMC | 24.8 |  |  | 24.1 |
Operating mines: |  |  |
U.S. Iron Ore | 174.5 |  |  | 189.9 |
Asia Pacific Iron Ore | 17.2 |  |  | 16.4 |
Total mine closure | 216.5 |  |  | 230.4 |
Total environmental and mine closure obligations | 220.0 |  |  | 234.0 |
Less current portion | 2.6 |  |  | 2.8 |
Long term environmental and mine closure obligations | $ | 217.4 |  |  | $ | 231.2 |
Mine Closure The accrued 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 rollforward of our asset retirement obligation liability related to our active mining locations for the six months ended June 30, 2016 and for the year ended December 31, 2015:
| (In Millions)
| June 30, 2016 |  | December 31, 2015
Asset retirement obligation at beginning of period | $ | 206.3 |  |  | $ | 142.4 |
Accretion expense | 5.8 |  |  | 6.5 |
Exchange rate changes | 0.4 |  |  | (1.1 | )
Revision in estimated cash flows | (20.8 | ) |  | 58.5 |
Asset retirement obligation at end of period | $ | 191.7 |  |  | $ | 206.3 |
The revisions in the estimated cash flows recorded during the six months ended June 30, 2016 relate primarily to revisions of the timing of the estimated cash flows related to one of our U.S. mines. For the year ended December 31, 2015, the revisions in estimated cash flows recorded during the year related primarily to revisions in the timing of the estimated cash flows and the technology associated with required storm water management systems expected to be implemented subsequent to the indefinite idling of the Empire mine.

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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 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13328-110859 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13185-110859 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section Y + Details
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