PENSION PLANS AND POST-RETIREMENT BENEFITS (Tables)

9 Months Ended

Sep. 30, 2022

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, 2022	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Components of net periodic benefit costs	(millions)
Service cost	$	19.9	$	7.7	$	12.2	$	0.8	$	0.4	$	0.4
Interest cost	19.9		9.6		9.9		1.9		1.0		1.0
Expected return on plan assets	(26.0)		(12.8)		(14.1)		(2.5)		(1.7)		(0.9)
Prior service cost	0.5		0.5		—		0.2		0.1		(0.4)
Recognized net actuarial (gain)/loss	8.6		6.4		9.7		(0.2)		—		(0.3)
Net periodic benefit costs before regulatory adjustment and intercompany allocations	22.9		11.4		17.7		0.2		(0.2)		(0.2)
Regulatory adjustment	8.1		2.2		(0.6)		(0.7)		(0.7)		0.5
Intercompany allocations	—		1.7		(5.1)		—		0.1		(0.2)
Net periodic benefit costs (income)	$	31.0	$	15.3	$	12.0	$	(0.5)	$	(0.8)	$	0.1

	Pension Benefits						Post-Retirement Benefits
Year to Date September 30, 2022	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Components of net periodic benefit costs	(millions)
Service cost	$	59.8	$	23.1	$	36.7	$	2.3	$	1.2	$	1.1
Interest cost	59.5		29.0		29.8		5.9		3.0		2.9
Expected return on plan assets	(78.0)		(38.4)		(42.3)		(7.6)		(4.9)		(2.8)
Prior service cost	1.4		1.5		—		0.4		0.3		(1.1)
Recognized net actuarial (gain)/loss	26.1		19.2		29.0		(0.3)		(0.1)		(0.5)
Net periodic benefit costs before regulatory adjustment and intercompany allocations	68.8		34.4		53.2		0.7		(0.5)		(0.4)
Regulatory adjustment	39.0		7.9		11.6		(1.9)		(2.1)		1.8
Intercompany allocations	—		2.1		(13.5)		—		0.2		(0.5)
Net periodic benefit costs (income)	$	107.8	$	44.4	$	51.3	$	(1.2)	$	(2.4)	$	0.9

	Pension Benefits						Post-Retirement Benefits
Three Months Ended September 30, 2021	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Components of net periodic benefit costs	(millions)
Service cost	$	21.0	$	7.4	$	13.6	$	0.8	$	0.4	$	0.4
Interest cost	21.2		10.3		10.7		2.0		1.0		1.0
Expected return on plan assets	(26.5)		(13.6)		(14.2)		(2.3)		(1.6)		(0.7)
Prior service cost	0.5		0.5		—		0.1		0.2		(0.3)
Recognized net actuarial loss	14.7		9.8		11.1		0.4		0.1		—
Settlement and special termination benefits	30.4		22.5		12.5		—		—		—
Net periodic benefit costs before regulatory adjustment and intercompany allocations	61.3		36.9		33.7		1.0		0.1		0.4
Regulatory adjustment	(20.1)		(22.6)		(7.1)		(1.2)		(0.9)		0.1
Intercompany allocations	—		1.0		(6.8)		—		0.1		(0.1)
Net periodic benefit costs (income)	$	41.2	$	15.3	$	19.8	$	(0.2)	$	(0.7)	$	0.4

	Pension Benefits						Post-Retirement Benefits
Year to Date September 30, 2021	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Components of net periodic benefit costs	(millions)
Service cost	$	63.3	$	22.3	$	41.0	$	2.5	$	1.2	$	1.3
Interest cost	63.8		31.0		32.3		5.9		3.0		2.9
Expected return on plan assets	(80.1)		(40.7)		(43.1)		(6.7)		(4.7)		(2.0)
Prior service cost	1.5		1.5		—		0.4		0.4		(0.8)
Recognized net actuarial (gain)/loss	44.2		29.1		33.4		1.0		0.4		(0.1)
Settlement and special termination benefits	30.4		22.5		12.5		—		—		—
Net periodic benefit costs before regulatory adjustment and intercompany allocations	123.1		65.7		76.1		3.1		0.3		1.3
Regulatory adjustment	(6.4)		(23.4)		(2.5)		(3.7)		(2.5)		0.2
Intercompany allocations	—		2.2		(19.0)		—		0.1		(0.3)
Net periodic benefit costs (income)	$	116.7	$	44.5	$	54.6	$	(0.6)	$	(2.1)	$	1.2