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ASSET RETIREMENT OBLIGATIONS (Notes) | 6 Months Ended
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Jun. 30, 2020
Asset Retirement Obligation [Abstract] |
ASSET RETIREMENT OBLIGATIONS | The following is a summary of our asset retirement obligations:
| (In Millions)
| June 30, 2020 |  | December 31, 2019
Asset retirement obligations 1 | $ | 183.3 |  |  | $ | 165.3 |
Less current portion | 2.2 |  |  | 2.1 |
Long-term asset retirement obligations | $ | 181.1 |  |  | $ | 163.2 |
1 Includes $33.0 million and $22.0 million related to our active operations as of June 30, 2020 and December 31, 2019, respectively. The accrued closure obligation is predominantly related to our indefinitely idled and closed iron ore mining operations and provides for contractual and legal obligations associated with the eventual closure of those operations. Additionally, we have included in our asset retirement obligation $13.9 million for our integrated steel facilities acquired in the Merger. The closure date for each of our active mine sites was determined based on the exhaustion date of the remaining iron ore reserves and the amortization of the related asset and accretion of the liability is recognized over the estimated mine lives. The closure date and expected timing of the capital requirements to meet our obligations for our indefinitely idled or closed mines is determined based on the unique circumstances of each property. For indefinitely idled or closed mines, the accretion of the liability is recognized over the anticipated timing of remediation. As the majority of our asset retirement obligations at our steelmaking operations have indeterminate settlement dates, asset retirement obligations have been recorded at present values using estimated ranges of the economic lives of the underlying assets. The following is a roll forward of our asset retirement obligation liability:
| (In Millions)
| 2020 |  | 2019
Asset retirement obligation as of January 1 | $ | 165.3 |  |  | $ | 172.4 |
Increase from AK Steel acquisition | 13.9 |  |  | — |
Accretion expense | 4.9 |  |  | 5.1 |
Remediation payments | (0.8 | ) |  | (0.4 | )
Asset retirement obligation as of June 30 | $ | 183.3 |  |  | $ | 177.1 |

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2175671 + Details
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