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RATE MATTERS AND REGULATION - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended
May 31, 2021
USD ($)
Apr. 30, 2021
USD ($)
Feb. 28, 2021
USD ($)
Mar. 31, 2021
USD ($)
Evergy Metro        
Regulatory Proceedings [Line Items]        
Increase in Wholesale Revenues     $ 76.7  
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       0.50
Approved return on equity, percentage       9.30%
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       21.1
FERC 2021 TFR Proceeding | Evergy Kansas Central | Federal Energy Regulatory Commission        
Regulatory Proceedings [Line Items]        
Annual transmissions revenue estimated amount of increase (decrease) over prior year       32.4
FERC 2021 TFR Proceeding | Evergy Metro | Federal Energy Regulatory Commission        
Regulatory Proceedings [Line Items]        
Annual transmissions revenue estimated amount of increase (decrease) over prior year       (3.9)
FERC 2020 TFR Proceeding | Evergy Kansas Central | Federal Energy Regulatory Commission        
Regulatory Proceedings [Line Items]        
Annual transmissions revenue estimated amount of increase (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 increase (decrease) over prior year       (1.7)
2021 KCC Winter Weather AAO | Evergy Kansas Central | CostsProbableofRefund        
Regulatory Proceedings [Line Items]        
Regulatory assets       $ 109.9
Subsequent Event | Transmission delivery charge | Evergy Kansas Central | Kansas Corporation Commission        
Regulatory Proceedings [Line Items]        
Annual revenue increase (decrease) approved   $ 37.9    
Subsequent Event | Transmission delivery charge | Evergy Metro | Kansas Corporation Commission        
Regulatory Proceedings [Line Items]        
Annual revenue increase (decrease) approved $ (2.4)