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ASSET RETIREMENT OBLIGATIONS (Tables)
6 Months Ended
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 obligations1
$
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