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ASSET RETIREMENT OBLIGATIONS (Tables) | 6 Months Ended
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Jun. 30, 2020
Asset Retirement Obligation [Abstract] |
Summary Of 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.
Schedule of Change in Asset Retirement Obligation | 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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