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ORGANIZATION AND BASIS OF PRESENTATION - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net $ 22,329.0 $ 22,136.5
Electric plant in service    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 32,372.1 32,129.3
Property, plant and equipment, adjustment 724.3 724.3
Accumulated depreciation (12,389.3) (12,304.9)
Property, plant and equipment, net 20,707.1 20,548.7
Construction work in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 1,458.3 1,421.2
Nuclear fuel, net    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 162.8 165.8
Plant to be retired, net    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 0.8 0.8
Evergy Kansas Central    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 11,181.3 11,080.8
Evergy Kansas Central | Electric plant in service    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 15,472.7 15,376.9
Property, plant and equipment, adjustment 724.3 724.3
Accumulated depreciation (5,901.6) (5,922.9)
Property, plant and equipment, net 10,295.4 10,178.3
Evergy Kansas Central | Construction work in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 804.3 819.5
Evergy Kansas Central | Nuclear fuel, net    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 80.8 82.2
Evergy Kansas Central | Plant to be retired, net    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 0.8 0.8
Evergy Metro    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 7,897.8 7,844.2
Evergy Metro | Electric plant in service    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 12,456.5 12,343.3
Property, plant and equipment, adjustment 0.0 0.0
Accumulated depreciation (5,157.6) (5,065.3)
Property, plant and equipment, net 7,298.9 7,278.0
Evergy Metro | Construction work in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 516.9 482.6
Evergy Metro | Nuclear fuel, net    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 82.0 83.6
Evergy Metro | Plant to be retired, net    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net $ 0.0 $ 0.0