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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract] |
Reconciliations of the Company's ARO liability | Reconciliations of the Company’s asset retirement obligations are as follows:
| Successor | Predecessor
| Year Ended December 31, 2018 |  | April 2 through December 31, 2017 | January 1 through April 1, 2017
| (Dollars in millions)
Balance at beginning of period | $ | 691.1 |  |  | $ | 664.2 |  | $ | 758.8 |
Liabilities incurred or acquired | 16.3 |  |  | — |  | — |
Liabilities settled or disposed | (57.8 | ) |  | (65.2 | ) | (2.7 | )
Accretion expense | 48.5 |  |  | 32.6 |  | 12.5 |
Revisions to estimates | 52.1 |  |  | 59.5 |  | (104.4 | )
Balance at end of period | $ | 750.2 |  |  | $ | 691.1 |  | $ | 664.2 |
Less: Current portion (included in “Accounts payable and accrued expenses”) | 63.8 |  |  | 34.1 |  | 31.1 |
Noncurrent obligation (included in “Asset retirement obligations”) | $ | 686.4 |  |  | $ | 657.0 |  | $ | 633.1 |
Balance at end of period — active locations | $ | 671.8 |  |  | $ | 612.9 |  | $ | 540.1 |
Balance at end of period — closed or inactive locations | $ | 78.4 |  |  | $ | 78.2 |  | $ | 124.1 |

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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/2003/role/presentationRef -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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