Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2021

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Asset Retirement Obligations

A reconciliation of our AROs is as follows:

	Years Ended December 31,
(in millions)	2021		2020
AROs, beginning of period	$	1,393.9	$	1,315.2
Liabilities incurred	20.2		10.8
Liabilities settled	(163.1)		(125.1)
Accretion expense	71.9		68.0
Revisions in estimated cash flows	443.3		167.3
Foreign currency translation	(16.9)		(42.3)
AROs, end of period	1,749.3		1,393.9
Less current portion	222.4		190.2
Non-current portion of AROs	$	1,526.9	$	1,203.7