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Asset Retirement Obligations | 12 Months Ended
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Dec. 31, 2024
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligations | Asset Retirement Obligations The reconciliation of the changes in our AROs is presented below:
| Year ended December 31,
| 2024 |  | 2023
Beginning balance | $ | 51.1 |  |  | $ | 21.2 |
Additional ARO liabilities incurred | 6.7 |  |  | 3.1 |
ARO liabilities settled | (4.6) |  |  | (1.5) |
Accretion expense | 2.1 |  |  | 2.0 |
Acquired ARO liabilities (See Note 2) | — |  |  | 23.9 |
Revisions in estimated cash flows | 10.8 |  |  | 2.4 |
Ending balance | $ | 66.1 |  |  | $ | 51.1 |
Current portion of asset retirement obligations (1) | 4.6 |  |  | 1.6 |
Asset retirement obligations - less current portion | $ | 61.5 |  |  | $ | 49.5 |
(1) Current portion of asset retirement obligations is recorded in accrued and other current liabilities.

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/410-20/tableOfContent Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 20 -Topic 410 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-2 + Details
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