XML 68 R49.htm IDEA: XBRL DOCUMENT
v3.20.4

Asset Retirement Obligations (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
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,
| 2020 |  | 2019
| (Dollars in millions)
Balance at beginning of period | $ | 752.3 |  |  | $ | 750.2 |
Liabilities settled or disposed | (38.4) |  |  | (47.7) |
Accretion expense | 56.0 |  |  | 54.1 |
Revisions to estimates | (41.7) |  |  | (4.3) |
Balance at end of period | $ | 728.2 |  |  | $ | 752.3 |
Less: Current portion (included in “Accounts payable and accrued expenses”) | 77.7 |  |  | 98.2 |
Noncurrent obligation (included in “Asset retirement obligations”) | $ | 650.5 |  |  | $ | 654.1 |
Balance at end of period — active locations | $ | 471.8 |  |  | $ | 525.4 |
Balance at end of period — closed or inactive locations | $ | 256.4 |  |  | $ | 226.9 |

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://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
Name: | us-gaap_ScheduleOfChangeInAssetRetirementObligationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration