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ORGANIZATION AND BASIS OF PRESENTATION - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net $ 18,838.1 $ 18,782.5
Electric plant in service    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 27,161.1 26,916.7
Property, plant and equipment, adjustment 740.6 740.6
Accumulated depreciation (9,856.2) (9,694.1)
Property, plant and equipment, net 18,045.5 17,963.2
Construction work in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 635.7 685.2
Nuclear fuel, net    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 155.9 133.1
Plant to be retired, net    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 1.0 1.0
Westar Energy    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 9,726.4 9,718.3
Westar Energy | Electric plant in service    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 13,263.5 13,176.7
Property, plant and equipment, adjustment 740.6 740.6
Accumulated depreciation (4,721.2) (4,642.8)
Property, plant and equipment, net 9,282.9 9,274.5
Westar Energy | Construction work in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 365.0 376.7
Westar Energy | Nuclear fuel, net    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 77.5 66.1
Westar Energy | Plant to be retired, net    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 1.0 1.0
KCP&L    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 6,714.1 6,688.1
KCP&L | Electric plant in service    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 10,546.0 10,439.1
Property, plant and equipment, adjustment 0.0 0.0
Accumulated depreciation (4,083.5) (4,022.4)
Property, plant and equipment, net 6,462.5 6,416.7
KCP&L | Construction work in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 173.2 204.4
KCP&L | Nuclear fuel, net    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 78.4 67.0
KCP&L | Plant to be retired, net    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net $ 0.0 $ 0.0