PENSION PLANS AND POST-RETIREMENT BENEFITS (Tables)

3 Months Ended

Mar. 31, 2024

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 March 31, 2024	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Components of net periodic benefit costs	(millions)
Service cost	$	11.5	$	4.7	$	6.8	$	0.4	$	0.2	$	0.2
Interest cost	22.4		11.4		10.7		2.5		1.3		1.2
Expected return on plan assets	(21.7)		(10.7)		(10.9)		(2.8)		(1.5)		(1.4)
Prior service cost	0.5		0.5		—		—		—		(0.1)
Recognized net actuarial (gain) loss	(4.3)		0.2		(4.4)		(1.0)		(0.5)		(0.4)
Net periodic benefit costs before regulatory adjustment and intercompany allocations	8.4		6.1		2.2		(0.9)		(0.5)		(0.5)
Regulatory adjustment	5.7		(2.1)		7.7		—		0.2		(0.1)
Intercompany allocations	—		(0.4)		(0.5)		—		—		0.1
Net periodic benefit costs (income)	$	14.1	$	3.6	$	9.4	$	(0.9)	$	(0.3)	$	(0.5)

	Pension Benefits						Post-Retirement Benefits
Three Months Ended March 31, 2023	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Components of net periodic benefit costs	(millions)
Service cost	$	11.2	$	4.6	$	6.6	$	0.4	$	0.2	$	0.2
Interest cost	22.4		11.4		10.8		2.8		1.4		1.3
Expected return on plan assets	(21.8)		(11.0)		(10.8)		(3.0)		(1.5)		(1.4)
Prior service cost	0.5		0.5		—		—		—		(0.1)
Recognized net actuarial gain	(5.6)		(0.8)		(4.6)		(1.0)		(0.5)		(0.5)
Settlement (gain) loss	(15.9)		0.4		(16.3)		—		—		—
Net periodic benefit costs before regulatory adjustment and intercompany allocations	(9.2)		5.1		(14.3)		(0.8)		(0.4)		(0.5)
Regulatory adjustment	33.5		7.4		25.9		(0.1)		(0.6)		0.6
Intercompany allocations	—		(0.5)		(0.2)		—		0.1		—
Net periodic benefit costs (income)	$	24.3	$	12.0	$	11.4	$	(0.9)	$	(0.9)	$	0.1