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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2020
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Asset Retirement Obligations | A reconciliation of our AROs is as follows:
| Years Ended December 31,
(in millions) | 2020 |  | 2019
AROs, beginning of period | $ | 1,315.2 |  |  | $ | 1,160.1 |
Liabilities incurred | 10.8 |  |  | 15.8 |
Liabilities settled | (125.1) |  |  | (112.8) |
Accretion expense | 68.0 |  |  | 62.4 |
Revisions in estimated cash flows | 167.3 |  |  | 191.0 |
Foreign currency translation | (42.3) |  |  | (1.3) |
AROs, end of period | 1,393.9 |  |  | 1,315.2 |
Less current portion | 190.2 |  |  | 154.4 |
Non-current portion of AROs | $ | 1,203.7 |  |  | $ | 1,160.8 |

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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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