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ORGANIZATION AND BASIS OF PRESENTATION - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net $ 27,405.6 $ 26,301.5
Electric plant in service    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 38,922.0 38,218.9
Property, plant and equipment, adjustment 739.8 739.8
Accumulated depreciation (15,388.7) (14,986.6)
Property, plant and equipment, net 24,273.1 23,972.1
Construction work in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 2,905.9 2,120.6
Nuclear fuel, net    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 226.6 208.8
Evergy Kansas Central    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 13,838.2 13,460.1
Evergy Kansas Central | Electric plant in service    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 19,232.0 18,893.6
Property, plant and equipment, adjustment 724.9 724.9
Accumulated depreciation (7,524.6) (7,308.5)
Property, plant and equipment, net 12,432.3 12,310.0
Evergy Kansas Central | Construction work in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 1,292.7 1,045.8
Evergy Kansas Central | Nuclear fuel, net    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 113.2 104.3
Evergy Metro    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 8,645.9 8,448.9
Evergy Metro | Electric plant in service    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 14,254.9 14,001.3
Property, plant and equipment, adjustment 0.0 0.0
Accumulated depreciation (6,275.9) (6,110.5)
Property, plant and equipment, net 7,979.0 7,890.8
Evergy Metro | Construction work in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 553.5 453.6
Evergy Metro | Nuclear fuel, net    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net $ 113.4 $ 104.5