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Related Party Transactions | 12 Months Ended
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Dec. 31, 2025
Related Party Transactions [Abstract] |
Related Party Transactions | Related-Party Transactions Transition Services Agreement On October 31, 2024, as part of the Separation, the Company and MDU Resources entered into a transition services agreement whereby the Company and MDU Resources provide certain transition services to each other. The transition services agreement outlines services that are provided between parties related to tax, legal, treasury, human resources, information technology, risk management and other general and administrative functions. For the years ended December 31, 2025 and 2024, the Company incurred $4.8 million and $0.7 million of transition services expenses related to services from MDU Resources, respectively, which were reflected in Selling, general and administrative expenses on the consolidated statements of income. During the second quarter of 2025, the Company deemed $0.5 million of expenses from the first quarter of 2025 to be recurring in nature and thus, not transition services expenses. For both of the years ended December 31, 2025 and 2024, the Company received an immaterial amount for its services to MDU Resources, which was reflected in Other income, net on the consolidated statements of income. Transition services are expected to be completed by March 31, 2026. Allocation of Corporate Expenses Prior to the Separation, Centennial and MDU Resources allocated expenses for corporate services provided to the Company, including costs related to senior management, legal, human resources, finance and accounting, treasury, information technology, internal audit, risk management and other shared services. The amounts allocated were $30.4 million and $27.1 million for the years ended December 31, 2024 and 2023, respectively. These expenses were allocated to the Company on the basis of direct usage where identifiable, with the remainder allocated on the basis of percent of total capital invested, the percent of total average cash management program borrowings with MDU Resources, the percent of total average commercial paper borrowings with Centennial or other allocation methodologies that were considered to be a reasonable reflection of the utilization of the services provided to the benefits received. Some of the utilization factors considered included the following: number of employees paid and stated as cost per check; number of employees served; weighted factor of travel, managed units, national account spending, equipment and fleet acquisitions; purchase order dollars spent and purchase order line count; number of payments, vouchers or unclaimed property reports; labor hours; time tracked; and projected workload. These cost allocations were a reasonable reflection of the utilization of services provided to, or the benefit derived by, the Company during the periods presented prior to the Separation. However, the allocations may not be indicative of the actual expenses that would have been incurred had the Company operated as a standalone company. Actual costs as a standalone company depend on a number of factors, including the chosen organizational structure, whether functions are outsourced or performed by Company employees, and strategic decisions made in areas such as selling and marketing, information technology and infrastructure. Refer to Note 2 – Basis of Presentation and Summary of Significant Accounting Policies for additional information. Cash Management and Financing Prior to the second quarter of 2023, Centennial had a commercial paper program and long-term borrowing arrangements in which the Company and certain of its subsidiaries participated. Centennial repaid all of its outstanding debt in the second quarter of 2023, and subsequently MDU Resources supported the Company’s borrowing needs through Centennial. The Company accounted for cash receipts and disbursements from MDU Resources and Centennial, through related-party receivables and payables. Until the Separation, the Company had related-party agreements in place with Centennial, via MDU Resources, for the financing of its capital needs. Following the Separation, the Company relies on its own credit and financing arrangements. Related-Party Notes Payable As part of the Separation, the Company repaid $230.0 million of outstanding cash management program borrowings to Centennial using a portion of the net proceeds of indebtedness incurred by the Company. The repayment amount represented the total related-party notes payable balance outstanding as of October 31, 2024, and thus, there were no amounts outstanding as of December 31, 2024. Also, as a result of the Separation, a portion of the net proceeds of the indebtedness was used to pay a $60.0 million dividend to MDU Resources and was included in Net transfers from (to) CEHI, LLC and MDU Resources in the consolidated statements of equity for the year ended December 31, 2024. Refer to Note 7 – Debt for more information. The Company repaid $27.0 million and $45.0 million of short- and long-term related-party notes payable, respectively, during the year ended December 31, 2023, in connection with the Knife River Corporation separation. The Company was allocated interest based on borrowings from or lending to the cash management and financing program as well as the funding related to these agreements as described above. The related-party interest expense associated with the Company’s participation in the cash management and financing program prior to the Separation was $10.2 million and $17.0 million for the years ended December 31, 2024 and 2023, respectively.

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- Definition The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 850 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483326/850-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480990/946-20-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480990/946-20-50-5 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480990/946-20-50-6 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477968/946-235-50-2 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477968/946-235-50-2 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(2)(g)(3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(2)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(2)(e)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 850 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/850/tableOfContent Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 850 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483326/850-10-50-6 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 850 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483326/850-10-50-1 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 850 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483326/850-10-50-1 + Details
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