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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2023
Asset Retirement Obligation [Abstract] |
Changes In Liability For Asset Retirement Obligations | Changes in our liability for asset retirement obligations for the years 2023 and 2022 are presented in the table below:
(in millions) | 2023 |  | 2022
Beginning Balance | $ | 513.5 |  |  | $ | 512.4 |
Accretion recorded as a regulatory asset/liability | 20.0 |  |  | 17.1 |
Additions | 23.5 |  |  | 9.5 |
Settlements | (41.6) |  |  | (22.3) |
Change in estimated cash flows | 37.6 |  |  | (3.2) |
Ending Balance | $ | 553.0 |  |  | $ | 513.5 |

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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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