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ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Tables) | 3 Months Ended
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Mar. 31, 2017
Environmental Remediation Obligations [Abstract] |
Summary Of Mine Closure Obligations | The following is a summary of the obligations as of March 31, 2017 and December 31, 2016:
| (In Millions)
| March 31, 2017 |  | December 31, 2016
Environmental | $ | 2.8 |  |  | $ | 2.8 |
Mine closure |  |  |
U.S. Iron Ore 1 | 190.9 |  |  | 187.8 |
Asia Pacific Iron Ore | 17.3 |  |  | 16.2 |
Total mine closure | 208.2 |  |  | 204.0 |
Total environmental and mine closure obligations | 211.0 |  |  | 206.8 |
Less current portion | 12.8 |  |  | 12.9 |
Long-term environmental and mine closure obligations | $ | 198.2 |  |  | $ | 193.9 |
1 U.S. Iron Ore 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 asset retirement obligation liability for the three months ended March 31, 2017 and for the year ended December 31, 2016:
| (In Millions)
| March 31, 2017 |  | December 31, 2016
Asset retirement obligation at beginning of period | $ | 204.0 |  |  | $ | 230.4 |
Accretion expense | 3.6 |  |  | 14.0 |
Remediation payments | (0.3 | ) |  | (2.2 | )
Exchange rate changes | 0.9 |  |  | (0.2 | )
Revision in estimated cash flows | — |  |  | (38.0 | )
Asset retirement obligation at end of period | $ | 208.2 |  |  | $ | 204.0 |

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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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