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ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Tables) | 9 Months Ended
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Sep. 30, 2015
Environmental Remediation Obligations [Abstract] |
Summary Of Mine Closure Obligations | The following is a summary of the obligations as of September 30, 2015 and December 31, 2014:
| (In Millions)
| September 30, 2015 |  | December 31, 2014
Environmental | $ | 4.3 |  |  | $ | 5.5 |
Mine closure |  |  |
LTVSMC | 23.9 |  |  | 22.9 |
Operating mines: |  |  |
U.S. Iron Ore | 171.5 |  |  | 120.9 |
Asia Pacific Iron Ore | 15.6 |  |  | 21.5 |
Total mine closure | 211.0 |  |  | 165.3 |
Total environmental and mine closure obligations | 215.3 |  |  | 170.8 |
Less current portion | 3.4 |  |  | 5.2 |
Long term environmental and mine closure obligations | $ | 211.9 |  |  | $ | 165.6 |
Asset Retirement Obligation Disclosure | The following represents a rollforward of our asset retirement obligation liability related to our active mining locations for the nine months ended September 30, 2015 and for the year ended December 31, 2014:
| (In Millions)
| September 30, 2015 |  | December 31, 2014 (1)
Asset retirement obligation at beginning of period | $ | 142.4 |  |  | $ | 177.6 |
Accretion expense | 4.5 |  |  | 5.7 |
Exchange rate changes | (1.7 | ) |  | (2.4 | )
Revision in estimated cash flows | 41.9 |  |  | (38.5 | )
Asset retirement obligation at end of period | $ | 187.1 |  |  | $ | 142.4 |
(1) Represents a 12-month rollforward of our asset retirement obligation at December 31, 2014.

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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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- Definition Tabular disclosure of environmental loss contingencies by individual site. Does not include loss contingencies that are not environmental in nature. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13283-110859 Reference 5: 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 + Details
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