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v3.25.4

Background and Nature of Operations (Details) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2024 $ / shares shares | Dec. 31, 2025 segment $ / shares shares | Dec. 31, 2024 shares | Oct. 30, 2024 shares
Product Information [Line Items] |  |  |  |
Number of operating segments | segment |  | 2 |  |
Number of reportable segments | segment |  | 2 |  |
Common stock, issued (in shares) | shares | 50,972,059 | 51,006,719 | 50,980,924 | 1,000
Common stock, outstanding (in shares) | shares | 50,972,059 | 51,006,719 | 50,980,924 | 1,000
Common stock, stated value (in dollars per share) | $ / shares | $ 0.01 | $ 0.01 |  |
MDU Resources Shareholders |  |  |  |
Product Information [Line Items] |  |  |  |
Common stock distribution ratio | 0.25 |  |  |

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