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ASSET RETIREMENT OBLIGATIONS (Tables)
 9 Months Ended
Sep. 30, 2020
Asset Retirement Obligation [Abstract]  
Summary Of Asset Retirement Obligations The following is a summary of our asset retirement obligations:
(In Millions)
September 30,
2020		December 31,
2019
Asset retirement obligations1
$186.4 $165.3 
Less current portion4.4 2.1 
Long-term asset retirement obligations$182.0 $163.2 
1 Includes $33.7 million and $22.0 million related to our active operations as of September 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)
20202019
Asset retirement obligation as of January 1$165.3 $172.4 
Increase from AK Steel acquisition16.7 — 
Accretion expense7.8 7.6 
Remediation payments(3.4)(0.5)
Asset retirement obligation as of September 30$186.4 $179.5