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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

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- References

No definition available.

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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

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