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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2023
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of changes in asset retirement obligations | The reconciliation of the changes in our AROs is presented below:
| Year ended December 31,
| 2023 |  | 2022
Beginning balance | $ | 21.2 |  |  | $ | 20.7 |
Additional ARO liabilities incurred | 3.1 |  |  | 3.8 |
ARO liabilities settled | (1.5) |  |  | (4.6) |
Accretion expense | 2.0 |  |  | 1.9 |
Acquired ARO liabilities (See Note 2) | 23.9 |  |  | — |
Revisions in estimated cash flows | 2.4 |  |  | (0.6) |
Ending balance | $ | 51.1 |  |  | $ | 21.2 |
Current portion of asset retirement obligations (1) | 1.6 |  |  | 1.6 |
Asset retirement obligations - less current portion | $ | 49.5 |  |  | $ | 19.6 |

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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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