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ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Tables) | 3 Months Ended
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Mar. 31, 2018
Environmental Remediation Obligations [Abstract] |
Summary Of Mine Closure Obligations | The following is a summary of the obligations:
| (In Millions)
| March 31, 2018 |  | December 31, 2017
Environmental | $ | 3.1 |  |  | $ | 2.9 |
Mine closure |  |  |
U.S. Iron Ore 1 | 170.7 |  |  | 168.4 |
Asia Pacific Iron Ore | 28.7 |  |  | 28.8 |
Total mine closure | 199.4 |  |  | 197.2 |
Total environmental and mine closure obligations | 202.5 |  |  | 200.1 |
Less current portion | 21.3 |  |  | 3.6 |
Long-term environmental and mine closure obligations | $ | 181.2 |  |  | $ | 196.5 |
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 mine closure obligation liability for the three months ended March 31, 2018 and for the year ended December 31, 2017:
| (In Millions)
| March 31, 2018 |  | December 31, 2017
Mine closure obligation at beginning of period | $ | 197.2 |  |  | $ | 204.0 |
Accretion expense | 2.7 |  |  | 14.9 |
Remediation payments | (0.1 | ) |  | (5.6 | )
Exchange rate changes | (0.5 | ) |  | 1.5 |
Revision in estimated cash flows | 0.1 |  |  | (17.6 | )
Mine closure obligation at end of period | $ | 199.4 |  |  | $ | 197.2 |

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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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