Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2022

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Asset Retirement Obligations

The following table presents the changes in our net asset retirement obligations (in millions):

	December 31,
	2022		2021
Net asset retirement obligations at January 1	$	36.2	$	35.1
Liabilities acquired(1)	23.6		—
Liabilities incurred	2.3		—
Liabilities settled	(0.6)		(0.4)
Accretion expense	2.0		1.9
Other(2)	(26.7)		(0.4)
Net asset retirement obligations at December 31(3)	$	36.8	$	36.2

(1)Relates to obligations associated with acquisitions during 2022 as further discussed in Note 3.

(2)Relates primarily to obligations associated with the divestitures of our Barnett and Marcellus assets during 2022, as further discussed in Note 3.

(3)Includes $0.4 million and $1.4 million of current ARO liabilities at December 31, 2022 and 2021.