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MNPUC (Details) - Pending Rate Case [Member] - MNPUC [Member] - Gas Distribution [Member] - Great Plains Natural Gas Co. [Member] - USD ($)
$ in Millions
Oct. 26, 2020
Jan. 01, 2020
Sep. 27, 2019
Public Utilities, General Disclosures [Line Items]      
Public Utilities, Requested Rate Increase (Decrease), Amount     $ 2.9
Public Utilities, Requested Rate Increase (Decrease), Percentage     12.00%
Public Utilities, Interim Rate Increase (Decrease), Amount   $ 2.6  
Public Utilities, Interim Rate Increase (Decrease), Percentage   11.00%  
Public Utilities, Approved Rate Increase (Decrease), Amount $ 2.6    
Public Utilities, Approved Rate Increase (Decrease), Percentage 11.50%