PENSION PLANS AND POST-RETIREMENT BENEFITS (Tables)

9 Months Ended

Sep. 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 September 30, 2020	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Components of net periodic benefit costs	(millions)
Service cost	$	20.1	$	6.8	$	13.3	$	0.7	$	0.3	$	0.4
Interest cost	24.0		11.7		12.1		2.3		1.2		1.1
Expected return on plan assets	(26.3)		(13.3)		(13.5)		(2.4)		(1.7)		(0.7)
Prior service cost	0.4		0.4		0.2		0.1		0.1		—
Recognized net actuarial (gain)/loss	12.1		8.5		11.6		0.1		—		(0.1)
Settlement and special termination benefits	10.0		—		12.7		—		—		—
Net periodic benefit costs before regulatory adjustment and intercompany allocations	40.3		14.1		36.4		0.8		(0.1)		0.7
Regulatory adjustment	(0.4)		0.4		(11.3)		(1.0)		(0.7)		(0.2)
Intercompany allocations	—		1.6		(5.8)		—		0.1		(0.1)
Net periodic benefit costs (income)	$	39.9	$	16.1	$	19.3	$	(0.2)	$	(0.7)	$	0.4

	Pension Benefits						Post-Retirement Benefits
Year to Date September 30, 2020	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Components of net periodic benefit costs	(millions)
Service cost	$	59.2	$	20.4	$	38.8	$	2.1	$	0.9	$	1.2
Interest cost	72.9		35.2		37.1		6.9		3.6		3.3
Expected return on plan assets	(79.7)		(39.9)		(41.5)		(7.0)		(5.0)		(2.0)
Prior service cost	1.3		1.2		0.6		0.3		0.3		—
Recognized net actuarial (gain)/loss	34.8		25.4		34.2		0.2		—		(0.4)
Settlement and special termination benefits	10.0		—		12.7		—		—		—
Net periodic benefit costs before regulatory adjustment and intercompany allocations	98.5		42.3		81.9		2.5		(0.2)		2.1
Regulatory adjustment	18.6		1.1		(9.2)		(2.9)		(2.1)		(0.3)
Intercompany allocations	—		(0.1)		(17.0)		—		0.1		(0.1)
Net periodic benefit costs (income)	$	117.1	$	43.3	$	55.7	$	(0.4)	$	(2.2)	$	1.7

	Pension Benefits						Post-Retirement Benefits
Three Months Ended September 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	$	7.3	$	11.8	$	0.6	$	0.2	$	0.4
Interest cost	27.5		13.4		14.1		2.6		1.4		1.2
Expected return on plan assets	(27.0)		(13.7)		(12.3)		(2.5)		(1.7)		(0.8)
Prior service cost	0.5		0.5		0.2		0.1		0.1		—
Recognized net actuarial (gain)/loss	6.9		6.2		12.2		(0.3)		(0.1)		(0.3)
Settlement and special termination benefits	14.5		—		20.8		—		—		—
Net periodic benefit costs before regulatory adjustment and intercompany allocations	41.5		13.7		46.8		0.5		(0.1)		0.5
Regulatory adjustment	4.9		0.5		(14.7)		(0.8)		(0.7)		0.1
Intercompany allocations	—		—		(13.6)		—		—		(0.2)
Net periodic benefit costs (income)	$	46.4	$	14.2	$	18.5	$	(0.3)	$	(0.8)	$	0.4

	Pension Benefits						Post-Retirement Benefits
Year to Date September 30, 2019	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Components of net periodic benefit costs	(millions)
Service cost	$	57.3	$	21.8	$	35.5	$	1.9	$	0.8	$	1.1
Interest cost	82.4		40.3		42.1		7.9		4.2		3.7
Expected return on plan assets	(80.9)		(41.1)		(36.9)		(7.5)		(5.0)		(2.5)
Prior service cost	1.5		1.3		0.7		0.3		0.3		—
Recognized net actuarial (gain)/loss	20.6		19.0		36.7		(0.9)		(0.4)		(1.1)
Settlement and special termination benefits	14.5		—		20.8		—		—		—
Net periodic benefit costs before regulatory adjustment and intercompany allocations	95.4		41.3		98.9		1.7		(0.1)		1.2
Regulatory adjustment	30.4		1.5		(15.9)		(2.5)		(2.2)		0.3
Intercompany allocations	—		—		(27.6)		—		—		(0.3)
Net periodic benefit costs (income)	$	125.8	$	42.8	$	55.4	$	(0.8)	$	(2.3)	$	1.2