XML 213 R46.htm IDEA: XBRL DOCUMENT
v3.24.0.1

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 |

X
- References No definition available. + Details
Name: | us-gaap_AssetRetirementObligationDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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 + Details
Name: | us-gaap_ScheduleOfChangeInAssetRetirementObligationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration