XML 150 R58.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Asset Retirement Obligations (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2019
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,
| 2019 |  | 2018
| (Dollars in millions)
Balance at beginning of period | $ | 750.2 |  |  | $ | 691.1 |
Liabilities incurred or acquired | — |  |  | 16.3 |
Liabilities settled or disposed | (47.7 | ) |  | (57.8 | )
Accretion expense | 54.1 |  |  | 48.5 |
Revisions to estimates | (4.3 | ) |  | 52.1 |
Balance at end of period | $ | 752.3 |  |  | $ | 750.2 |
Less: Current portion (included in “Accounts payable and accrued expenses”) | 98.2 |  |  | 63.8 |
Noncurrent obligation (included in “Asset retirement obligations”) | $ | 654.1 |  |  | $ | 686.4 |
Balance at end of period — active locations | $ | 525.4 |  |  | $ | 671.8 |
Balance at end of period — closed or inactive locations | $ | 226.9 |  |  | $ | 78.4 |

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