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ASSET RETIREMENT OBLIGATIONS (Tables) | 3 Months Ended
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Mar. 31, 2020
Environmental Remediation Obligations [Abstract] |  |
Summary Of Asset Retirement Obligations | The following is a summary of our asset retirement obligations:
| (In Millions)
| March 31, 2020 |  | December 31, 2019
Asset retirement obligations 1 | $ | 181.4 |  |  | $ | 165.3 |
Less current portion | 2.2 |  |  | 2.1 |
Long-term asset retirement obligations | $ | 179.2 |  |  | $ | 163.2 |
1 Includes $32.5 million and $22.0 million related to our active operations as of March 31, 2020 and December 31, 2019, respectively. | [1]
Schedule of Change in Asset Retirement Obligation | The following is a roll forward of our asset retirement obligation liability:
| (In Millions)
| March 31, 2020 |  | December 31, 2019
Asset retirement obligation at beginning of period | $ | 165.3 |  |  | $ | 172.4 |
Increase from AK Steel acquisition | 13.9 |  |  | — |
Accretion expense | 2.6 |  |  | 10.1 |
Remediation payments | (0.4 | ) |  | (0.8 | )
Revision in estimated cash flows | — |  |  | (16.4 | )
Asset retirement obligation at end of period | $ | 181.4 |  |  | $ | 165.3 |
[1] | 1 Includes $32.5 million and $22.0 million related to our active operations as of March 31, 2020 and December 31, 2019, respectively.

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