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Schedule of Change in Asset Retirement Obligations (Tables) | 9 Months Ended
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Sep. 30, 2023
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) | September 30, 2023 |  | December 31, 2022
AROs, beginning of period | $ | 1,905.6 |  |  | $ | 1,749.3 |
Liabilities incurred | 15.2 |  |  | 14.9 |
Liabilities settled | (147.5) |  |  | (205.6) |
Accretion expense | 70.0 |  |  | 81.6 |
Revisions in estimated cash flows | 293.7 |  |  | 264.5 |
Foreign currency translation | 9.2 |  |  | 0.9 |
AROs, end of period | 2,146.2 |  |  | 1,905.6 |
Less current portion | 392.1 |  |  | 212.3 |
Non-current portion of AROs | $ | 1,754.1 |  |  | $ | 1,693.3 |

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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 -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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