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Discontinued Operations and Disposal Groups (Policies)
 9 Months Ended
Sep. 30, 2023
Discontinued Operations and Disposal Groups [Abstract]  
Discontinued Operations, Policy As a result of the separation, the historical assets and liabilities for Knife River have been classified as assets and liabilities of discontinued operations and the historical results of operations are shown in Discontinued operations, net of tax, other than allocated general corporate overhead costs of the Company, which do not meet the criteria for income (loss) from discontinued operations. The Company’s consolidated financial statements and accompanying notes for prior periods have been restated. For the comparative periods, Knife River's operations are only reflected through May 2023, whereas 2022 includes the full three and nine months from Knife River's operations.