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Accounting for Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Asset Retirement Obligations | A reconciliation of our AROs is as follows:
| Years Ended December 31,
(in millions) | 2018 |  | 2017
AROs, beginning of period | $ | 859.3 |  |  | $ | 849.9 |
Liabilities acquired in the Acquisition | 258.9 |  |  | — |
Liabilities incurred | 27.8 |  |  | 27.1 |
Liabilities settled | (69.6 | ) |  | (64.8 | )
Accretion expense | 48.0 |  |  | 25.7 |
Revisions in estimated cash flows | 78.2 |  |  | 15.7 |
Foreign currency translation | (42.5 | ) |  | 5.7 |
AROs, end of period | 1,160.1 |  |  | 859.3 |
Less current portion | 136.3 |  |  | 98.1 |
| $ | 1,023.8 |  |  | $ | 761.2 |

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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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