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ORGANIZATION AND BASIS OF PRESENTATION - Other Income And Expense (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Entity Information [Line Items]    
Non-service cost component of net benefit cost $ (14.8) $ (18.4)
Other (6.5) (6.5)
Other expense (21.3) (24.9)
Evergy Kansas Central    
Entity Information [Line Items]    
Non-service cost component of net benefit cost (4.0) (4.6)
Other (5.9) (5.6)
Other expense (9.9) (10.2)
Evergy Metro    
Entity Information [Line Items]    
Non-service cost component of net benefit cost (8.7) (10.0)
Other (0.3) (0.5)
Other expense $ (9.0) $ (10.5)