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