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Asset Retirement Obligations (ARO) (Tables) | 9 Months Ended
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Sep. 30, 2023
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Reconciliation of Beginning and Ending Aggregate Carrying Amount of Asset Retirement Obligation | A reconciliation of the beginning and ending aggregate carrying amount of the ARO is shown in the following table.
(Millions of dollars) |  | September 30, 2023 |  | December 31, 2022
Balance at beginning of period |  | $ | 43.3 |  |  | $ | 39.2 |
Accretion expense |  | 2.2 |  |  | 2.7 |
Settlements of liabilities |  | (3.1) |  |  | (2.3) |
Liabilities incurred |  | 1.6 |  |  | 3.7 |
Balance at end of period |  | $ | 44.0 |  |  | $ | 43.3 |

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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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