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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 Change in Asset Retirement Obligation | The following tables present the details of AROs which are included on the accompanying Consolidated Balance Sheets in Other deferred credits and other liabilities (in millions):
| December 31, 2022 |  | Liabilities Incurred |  | Liabilities Settled |  | Accretion |  | Revisions to Prior Estimates |  | December 31, 2023 |
Electric Utilities | $ | 27.6 |  | $ | — |  | $ | — |  | $ | 1.2 |  | $ | (0.1 | ) | $ | 28.7 |
Gas Utilities (a) |  | 61.3 |  |  | 6.7 |  |  | — |  |  | 2.3 |  |  | (2.8 | ) |  | 67.5 |
Total | $ | 88.9 |  | $ | 6.7 |  | $ | — |  | $ | 3.5 |  | $ | (2.9 | ) | $ | 96.2 |
| December 31, 2021 |  | Liabilities Incurred |  | Liabilities Settled |  | Accretion |  | Revisions to Prior Estimates |  | December 31, 2022 |
Electric Utilities | $ | 30.1 |  | $ | — |  | $ | (3.0 | ) | $ | 1.4 |  | $ | (0.9 | ) | $ | 27.6 |
Gas Utilities (a) |  | 45.5 |  |  | — |  |  | (0.2 | ) |  | 2.0 |  |  | 14.0 |  |  | 61.3 |
Total | $ | 75.6 |  | $ | — |  | $ | (3.2 | ) | $ | 3.4 |  | $ | 13.1 |  | $ | 88.9 |
(a) The Revisions to Prior Estimates were primarily driven by changes in estimates associated with natural gas wells and compressor stations.

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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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