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Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2023

Asset Retirement Obligation Disclosure [Abstract]

Reconciliations of the Company's ARO liability

Reconciliations of the Company’s asset retirement obligations are as follows:

			December 31,
			2023						2022
			(Dollars in millions)
Balance at beginning of period			$	750.0					$	719.8
Liabilities settled			(60.4)						(51.7)
Accretion expense			61.3						56.2
Revisions to estimates			(48.1)						25.7
Balance at end of period			$	702.8					$	750.0
Less: Current portion (included in “Accounts payable and accrued expenses”)			54.2						84.2
Noncurrent obligation (included in “Asset retirement obligations, less current portion”)			$	648.6					$	665.8
Balance at end of period — active locations			$	541.3					$	557.9
Balance at end of period — closed or inactive locations			$	161.5					$	192.1

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- References

No definition available.

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- Definition

Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481850/410-20-50-1

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