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WUTC (Details 5) - Pending Rate Case [Member] - WUTC [Member] - Cascade Natural Gas [Member] - USD ($)
$ in Millions
Jun. 19, 2020
May 29, 2020
Pipeline Cost Recovery Mechanism [Member]    
Public Utilities, General Disclosures [Line Items]    
Public Utilities, Requested Rate Increase (Decrease), Amount   $ 1.0
Public Utilities, Requested Rate Increase (Decrease), Percentage   0.40%
Gas Distribution [Member]    
Public Utilities, General Disclosures [Line Items]    
Public Utilities, Requested Rate Increase (Decrease), Amount $ 13.8  
Public Utilities, Requested Rate Increase (Decrease), Percentage 5.30%