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Schedule of Change in Asset Retirement Obligations (Tables) | 6 Months Ended
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Jun. 30, 2022
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Change in Asset Retirement Obligation [Table Text Block] | A reconciliation of our AROs is as follows:
(in millions) | June 30, 2022 |  | December 31, 2021
AROs, beginning of period | $ | 1,749.3 |  |  | $ | 1,393.9 |
Liabilities incurred | 9.9 |  |  | 20.2 |
Liabilities settled | (97.8) |  |  | (163.1) |
Accretion expense | 39.6 |  |  | 71.9 |
Revisions in estimated cash flows | 12.8 |  |  | 443.3 |
Foreign currency translation | 10.3 |  |  | (16.9) |
AROs, end of period | 1,724.1 |  |  | 1,749.3 |
Less current portion | 200.0 |  |  | 222.4 |
Non-current portion of AROs | $ | 1,524.1 |  |  | $ | 1,526.9 |

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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