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Property, Plant & Equipment Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Line Items]  
Public Utility Property, Plant, and Equipment [Table Text Block]
December 31, 2018
 
Evergy
 
Westar Energy
 
KCP&L
 
 
(millions)
Electric plant in service
 
$
26,916.7

 
$
13,176.7

 
$
10,439.1

Electric plant acquisition adjustment
 
740.6

 
740.6

 
—

Accumulated depreciation
 
(9,694.1
)
 
(4,642.8
)
 
(4,022.4
)
Plant in service
 
17,963.2

 
9,274.5

 
6,416.7

Construction work in progress
 
685.2

 
376.7

 
204.4

Nuclear fuel, net
 
133.1

 
66.1

 
67.0

Plant to be retired, net (b)
 
1.0

 
1.0

 
—

Net property, plant and equipment
 
$
18,782.5

 
$
9,718.3

 
$
6,688.1

 
 
 
 

 

December 31, 2017
 
Evergy
 
Westar Energy
 
KCP&L (a)
 
 
(millions)
Electric plant in service
 
$
12,954.3

 
$
12,954.3

 
$
10,213.2

Electric plant acquisition adjustment
 
739.0

 
739.0

 
—

Accumulated depreciation
 
(4,651.7
)
 
(4,651.7
)
 
(4,070.3
)
Plant in service
 
9,041.6

 
9,041.6

 
6,142.9

Construction work in progress
 
434.9

 
434.9

 
350.3

Nuclear fuel, net
 
71.4

 
71.4

 
72.4

Plant to be retired, net (b)
 
5.9

 
5.9

 
—

Net property, plant and equipment
 
$
9,553.8

 
$
9,553.8

 
$
6,565.6
Property_Plant_&_Equipment_of_VIEs [Table Text Block]
 
 
 
December 31
 
 
 
2018
 
2017
 
 
 
(millions)
 
Electric plant of VIEs
 
 
$
392.1

 
 
 
$
392.1

 
Accumulated depreciation of VIEs
 
 
(222.9
)
 
 
 
(215.8
)
 
Net property, plant and equipment of VIEs
 
 
$
169.2

 
 
 
$
176.3

 
Depreciation_Expense [Table Text Block]
 
 
2018
 
2017
 
2016
 
 
(millions)
Evergy (a)
 
$
567.9

 
$
350.0

 
$
316.7

Westar Energy (a)
 
371.3

 
350.0

 
316.7

KCP&L
 
235.3

 
228.4

 
215.4