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PENSION PLANS AND POST-RETIREMENT BENEFITS (Tables)
 6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
The following tables provide the components of net periodic benefit costs prior to the effects of capitalization and sharing with joint owners of power plants.
 
Pension Benefits
 
Post-Retirement Benefits
Three Months Ended June 30, 2020
Evergy
 
Evergy Kansas Central
 
Evergy Metro
 
Evergy
 
Evergy Kansas Central
 
Evergy Metro
Components of net periodic benefit costs
(millions)
Service cost
$
19.5

 
$
6.8

 
$
12.7

 
$
0.7

 
$
0.3

 
$
0.4

Interest cost
24.5

 
11.7

 
12.4

 
2.3

 
1.2

 
1.1

Expected return on plan assets
(26.7
)
 
(13.3
)
 
(13.9
)
 
(2.3
)
 
(1.6
)
 
(0.6
)
Prior service cost
0.5

 
0.4

 
0.2

 
0.1

 
0.1

 
—

Recognized net actuarial (gain)/loss
11.3

 
8.5

 
11.3

 
—

 
—

 
(0.2
)
Net periodic benefit costs before regulatory adjustment and intercompany allocations
29.1

 
14.1

 
22.7

 
0.8

 
—

 
0.7

Regulatory adjustment
9.1

 
0.3

 
0.7

 
(1.0
)
 
(0.7
)
 
(0.1
)
Intercompany allocations
—

 
(1.7
)
 
(5.0
)
 
—

 
—

 
(0.2
)
Net periodic benefit costs (income)
$
38.2

 
$
12.7

 
$
18.4

 
$
(0.2
)
 
$
(0.7
)
 
$
0.4

 
 
 
 
 
 
 
 
 
 
 
 
 
Pension Benefits
 
Post-Retirement Benefits
Year to Date June 30, 2020
Evergy
 
Evergy Kansas Central
 
Evergy Metro
 
Evergy
 
Evergy Kansas Central
 
Evergy Metro
Components of net periodic benefit costs
(millions)
Service cost
$
39.1

 
$
13.6

 
$
25.5

 
$
1.4

 
$
0.6

 
$
0.8

Interest cost
48.9

 
23.5

 
25.0

 
4.6

 
2.4

 
2.2

Expected return on plan assets
(53.4
)
 
(26.6
)
 
(28.0
)
 
(4.6
)
 
(3.3
)
 
(1.3
)
Prior service cost
0.9

 
0.8

 
0.4

 
0.2

 
0.2

 
—

Recognized net actuarial (gain)/loss
22.7

 
16.9

 
22.6

 
0.1

 
—

 
(0.3
)
Net periodic benefit costs before regulatory adjustment and intercompany allocations
58.2

 
28.2

 
45.5

 
1.7

 
(0.1
)
 
1.4

Regulatory adjustment
19.0

 
0.7

 
2.1

 
(1.9
)
 
(1.4
)
 
(0.1
)
Intercompany allocations
—

 
(1.7
)
 
(11.2
)
 
—

 
—

 
—

Net periodic benefit costs (income)
$
77.2

 
$
27.2

 
$
36.4

 
$
(0.2
)
 
$
(1.5
)
 
$
1.3


 
Pension Benefits
 
Post-Retirement Benefits
Three Months Ended June 30, 2019
Evergy
 
Evergy Kansas Central
 
Evergy Metro
 
Evergy
 
Evergy Kansas Central
 
Evergy Metro
Components of net periodic benefit costs
(millions)
Service cost
$
19.1

 
$
7.2

 
$
11.9

 
$
0.7

 
$
0.3

 
$
0.4

Interest cost
27.4

 
13.5

 
13.9

 
2.7

 
1.4

 
1.3

Expected return on plan assets
(26.8
)
 
(13.7
)
 
(12.3
)
 
(2.6
)
 
(1.6
)
 
(1.0
)
Prior service cost
0.5

 
0.4

 
0.3

 
0.1

 
0.1

 
—

Recognized net actuarial (gain)/loss
6.8

 
6.4

 
12.3

 
(0.3
)
 
(0.2
)
 
(0.4
)
Net periodic benefit costs before regulatory adjustment and intercompany allocations
27.0

 
13.8

 
26.1

 
0.6

 
—

 
0.3

Regulatory adjustment
12.7

 
0.5

 
(0.6
)
 
(0.9
)
 
(0.7
)
 
0.1

Intercompany allocations
—

 
—

 
(7.1
)
 
—

 
—

 
—

Net periodic benefit costs (income)
$
39.7

 
$
14.3

 
$
18.4

 
$
(0.3
)
 
$
(0.7
)
 
$
0.4

 
 
 
 
 
 
 
 
 
 
 
 
 
Pension Benefits
 
Post-Retirement Benefits
Year to Date June 30, 2019
Evergy
 
Evergy Kansas Central
 
Evergy Metro
 
Evergy
 
Evergy Kansas Central
 
Evergy Metro
Components of net periodic benefit costs
(millions)
Service cost
$
38.2

 
$
14.5

 
$
23.7

 
$
1.3

 
$
0.6

 
$
0.7

Interest cost
54.9

 
26.9

 
28.0

 
5.3

 
2.8

 
2.5

Expected return on plan assets
(53.9
)
 
(27.4
)
 
(24.6
)
 
(5.0
)
 
(3.3
)
 
(1.7
)
Prior service cost
1.0

 
0.8

 
0.5

 
0.2

 
0.2

 
—

Recognized net actuarial (gain)/loss
13.7

 
12.8

 
24.5

 
(0.6
)
 
(0.3
)
 
(0.8
)
Net periodic benefit costs before regulatory adjustment and intercompany allocations
53.9

 
27.6

 
52.1

 
1.2

 
—

 
0.7

Regulatory adjustment
25.5

 
1.0

 
(1.2
)
 
(1.7
)
 
(1.5
)
 
0.2

Intercompany allocations
—

 
—

 
(14.0
)
 
—

 
—

 
(0.1
)
Net periodic benefit costs (income)
$
79.4

 
$
28.6

 
$
36.9

 
$
(0.5
)
 
$
(1.5
)
 
$
0.8