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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2024
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,
| 2024 |  | 2023
| (Dollars in millions)
Balance at beginning of period | $ | 702.8 |  |  | $ | 750.0 |
Liabilities settled | (51.7) |  |  | (60.4) |
Accretion expense | 51.4 |  |  | 61.3 |
Revisions to estimates | 21.2 |  |  | (48.1) |
Balance at end of period | $ | 723.7 |  |  | $ | 702.8 |
Less: Current portion (included in “Accounts payable and accrued expenses”) | 55.9 |  |  | 54.2 |
Noncurrent obligation (included in “Asset retirement obligations, less current portion”) | $ | 667.8 |  |  | $ | 648.6 |
Balance at end of period — active locations | $ | 507.9 |  |  | $ | 541.3 |
Balance at end of period — closed or inactive locations | $ | 215.8 |  |  | $ | 161.5 |

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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 + Details
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