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RATE MATTERS AND REGULATION - Narrative (Details)
$ in Millions
1 Months Ended 6 Months Ended
May 31, 2020
USD ($)
Apr. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Transmission delivery charge | Evergy Kansas Central | Kansas Corporation Commission      
Regulatory Proceedings [Line Items]      
Annual revenue increase (decrease) approved   $ 3.5  
Transmission delivery charge | Evergy Metro | Kansas Corporation Commission      
Regulatory Proceedings [Line Items]      
Annual revenue increase (decrease) approved $ (2.7)    
2018 Rate Case Proceedings | Evergy Kansas Central | Kansas Corporation Commission      
Regulatory Proceedings [Line Items]      
Refund percent on earnings over approved return on equity     0.50
Approved return on equity, percentage     9.30%
2018 Rate Case Proceedings | Evergy Metro | Kansas Corporation Commission      
Regulatory Proceedings [Line Items]      
Refund percent on earnings over approved return on equity     0.5
Approved return on equity, percentage     9.30%
FERC 2020 TFR Proceeding | Evergy Kansas Central | Federal Energy Regulatory Commission      
Regulatory Proceedings [Line Items]      
Annual transmissions revenue estimated amount of decrease over prior year     $ 6.8
FERC 2020 TFR Proceeding | Evergy Metro | Federal Energy Regulatory Commission      
Regulatory Proceedings [Line Items]      
Annual transmissions revenue estimated amount of decrease over prior year     (1.7)
2018 MPSC OPC MECG Petition      
Regulatory Proceedings [Line Items]      
Annual estimated loss contingency portion not accrued (up to)     12.0
2018 MPSC OPC MECG Petition | Revenues Probable Of Refund      
Regulatory Proceedings [Line Items]      
Regulatory liabilities     $ 15.6