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RATE MATTERS AND REGULATION - Narrative (Details)
$ in Millions
1 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
MW
Jul. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
May 31, 2021
USD ($)
Apr. 30, 2021
USD ($)
Feb. 28, 2021
USD ($)
Sep. 30, 2021
USD ($)
Evergy Metro              
Regulatory Proceedings [Line Items]              
Increase in Wholesale Revenues           $ 71.6  
Evergy Metro | Missouri Public Service Commission              
Regulatory Proceedings [Line Items]              
Public Utilities, Recovery Mechanism Percent for Fuel Cost             0.95
Public Utilities, Recovery Mechanism's Sharing Percentage for Fuel Cost             0.05
Evergy Missouri West | Missouri Public Service Commission              
Regulatory Proceedings [Line Items]              
Public Utilities, Recovery Mechanism Percent for Fuel Cost             0.95
Public Utilities, Recovery Mechanism's Sharing Percentage for Fuel Cost             0.05
Transmission delivery charge | Evergy Kansas Central | Kansas Corporation Commission              
Regulatory Proceedings [Line Items]              
Annual revenue increase (decrease) approved         $ 37.9    
Transmission delivery charge | Evergy Metro | Kansas Corporation Commission              
Regulatory Proceedings [Line Items]              
Annual revenue increase (decrease) approved       $ (2.4)      
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 $ 26.5           26.5
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 115.0           115.0
2021 KCC Winter Weather AAO | Evergy Metro              
Regulatory Proceedings [Line Items]              
Public Utilities, Requested Refund Increase (Decrease), Amount   $ (6.0)          
2021 KCC Winter Weather AAO | Revenues Probable Of Refund | Evergy Metro              
Regulatory Proceedings [Line Items]              
Regulatory liabilities 42.4           42.4
2021 MPSC Winter Weather | Evergy Metro              
Regulatory Proceedings [Line Items]              
Public Utilities, Requested Refund Increase (Decrease), Amount     $ (5.0)        
2021 MPSC Winter Weather | Evergy Missouri West              
Regulatory Proceedings [Line Items]              
Public Utilities Requested Increase of Recovery     $ 15.0        
2021 MPSC Winter Weather | Evergy Missouri West | CostsProbableofRefund              
Regulatory Proceedings [Line Items]              
Regulatory assets 278.7           278.7
2021 MPSC Winter Weather | Revenues Probable Of Refund | Evergy Metro              
Regulatory Proceedings [Line Items]              
Regulatory liabilities $ 28.0           $ 28.0
Utility Financing and Securitization Act - KS | Evergy Kansas Central              
Regulatory Proceedings [Line Items]              
Planned Capacity of Investment in Renewable Generation | MW 190