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ASSET RETIREMENT OBLIGATIONS (Tables) | 6 Months Ended
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Jun. 30, 2024
Asset Retirement Obligation Disclosure [Abstract] |
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 June 30 | Six Months Ended June 30
in millions | 2024 | 2023 | 2024 | 2023
Accretion | $ | 3.6 |  | $ | 3.4 |  | $ | 7.1 |  | $ | 6.9 |
Depreciation | 2.8 |  | 2.2 |  | 5.2 |  | 4.3 |
Total ARO operating costs | $ | 6.4 |  | $ | 5.6 |  | $ | 12.3 |  | $ | 11.2 |
Reconciliations of Asset Retirement Obligations | Reconciliations of the carrying amounts of our AROs are as follows:
| Three Months Ended June 30 | Six Months Ended June 30
in millions | 2024 | 2023 | 2024 | 2023
ARO balance at beginning of period | $ | 325.7 |  | $ | 311.9 |  | $ | 324.1 |  | $ | 311.3 |
Liabilities incurred | 0.8 |  | 0.0 |  | 0.8 |  | 0.0 |
Liabilities settled | (3.0) |  | (3.7) |  | (4.8) |  | (6.6) |
Accretion expense | 3.6 |  | 3.4 |  | 7.1 |  | 6.9 |
Revisions, net | 7.0 |  | 0.0 |  | 6.9 |  | 0.0 |
ARO balance at end of period | $ | 334.1 |  | $ | 311.6 |  | $ | 334.1 |  | $ | 311.6 |

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