XML 45 R33.htm IDEA: XBRL DOCUMENT
v3.25.1

Asset Retirement Obligations (ARO) (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2025
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) |  | March 31, 2025 |  | December 31, 2024
Balance at beginning of period |  | $ | 49.1 |  |  | $ | 46.1 |
Accretion expense |  | 0.9 |  |  | 3.2 |
Settlements of liabilities |  | (0.7) |  |  | (3.1) |
Liabilities incurred |  | — |  |  | 2.9 |
Balance at end of period |  | $ | 49.3 |  |  | $ | 49.1 |

X
- References No definition available. + Details
Name: | us-gaap_AssetRetirementObligationDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfChangeInAssetRetirementObligationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration