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ASSET RETIREMENT OBLIGATIONS (Tables) | 9 Months Ended
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Sep. 30, 2025
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Asset Retirement Obligations Operating Costs | ARO operating costs related to accretion of the liabilities and depreciation of the assets are as follows:
| Three Months Ended September 30 | Nine Months Ended September 30
in millions | 2025 | 2024 | 2025 | 2024
Accretion | $ | 5.0 |  | $ | 3.7 |  | $ | 14.0 |  | $ | 10.8 |
Depreciation | 2.4 |  | 3.2 |  | 10.4 |  | 8.4 |
Total ARO operating costs | $ | 7.4 |  | $ | 6.9 |  | $ | 24.4 |  | $ | 19.2 |
Schedule of Reconciliations of Asset Retirement Obligations | Reconciliations of the carrying amounts of our ARO liabilities are as follows:
| Three Months Ended September 30 | Nine Months Ended September 30
in millions | 2025 | 2024 | 2025 | 2024
ARO liability balance at beginning of period | $ | 447.8 |  | $ | 334.1 |  | $ | 427.4 |  | $ | 324.1 |
Liabilities incurred | 6.0 |  | 0.0 |  | 29.2 |  | 0.8 |
Liabilities settled 1 | (2.7) |  | (3.5) |  | (14.4) |  | (8.3) |
Accretion expense | 5.0 |  | 3.7 |  | 14.0 |  | 10.8 |
Revisions, net | (10.0) |  | 12.2 |  | (10.1) |  | 19.1 |
ARO liability balance at end of period | $ | 446.1 |  | $ | 346.5 |  | $ | 446.1 |  | $ | 346.5 |

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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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- Definition The tabular disclosure of asset retirement obligations operating costs. + References No definition available. + Details
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