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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2021
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,
| 2021 |  | 2020
| (Dollars in millions)
Balance at beginning of period | $ | 728.2 |  |  | $ | 752.3 |
Liabilities settled or disposed | (72.4) |  |  | (38.4) |
Accretion expense | 54.9 |  |  | 56.0 |
Revisions to estimates | 9.1 |  |  | (41.7) |
Balance at end of period | $ | 719.8 |  |  | $ | 728.2 |
Less: Current portion (included in “Accounts payable and accrued expenses”) | 65.0 |  |  | 77.7 |
Noncurrent obligation (included in “Asset retirement obligations”) | $ | 654.8 |  |  | $ | 650.5 |
Balance at end of period — active locations | $ | 511.8 |  |  | $ | 471.8 |
Balance at end of period — closed or inactive locations | $ | 208.0 |  |  | $ | 256.4 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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