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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Income (Expense) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Income Expense Net [Line Items]      
Non-service cost component of net benefit cost $ (58.6) $ (55.6) $ (47.8)
Other (19.6) (21.3) (30.9)
Other expense (78.2) (76.9) (78.7)
Evergy Kansas Central      
Other Income Expense Net [Line Items]      
Non-service cost component of net benefit cost (21.2) (20.1) (23.5)
Other (17.7) (20.0) (23.3)
Other expense (38.9) (40.1) (46.8)
Evergy Metro      
Other Income Expense Net [Line Items]      
Non-service cost component of net benefit cost (24.2) (20.9) (25.9)
Other (1.3) (0.5) (5.0)
Other expense $ (25.5) $ (21.4) $ (30.9)