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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