PENSION PLANS AND POST-RETIREMENT BENEFITS (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2020	Evergy			Evergy Kansas Central			Evergy Metro			Evergy			Evergy Kansas Central			Evergy Metro
Components of net periodic benefit costs	(millions)
Service cost	$	19.6		$	6.8		$	12.8		$	0.7		$	0.3		$	0.4
Interest cost	24.4			11.8			12.6			2.3			1.2			1.1
Expected return on plan assets	(26.7		)	(13.3		)	(14.1		)	(2.3		)	(1.7		)	(0.7		)
Prior service cost	0.4			0.4			0.2			0.1			0.1			—
Recognized net actuarial (gain)/loss	11.4			8.4			11.3			0.1			—			(0.1		)
Net periodic benefit costs before regulatory adjustment and intercompany allocations	29.1			14.1			22.8			0.9			(0.1		)	0.7
Regulatory adjustment	9.9			0.4			1.4			(0.9		)	(0.7		)	—
Intercompany allocations	—			—			(6.2		)	—			—			0.2
Net periodic benefit costs (income)	$	39.0		$	14.5		$	18.0		$	—		$	(0.8	)	$	0.9

	Pension Benefits									Post-Retirement Benefits
Three Months Ended March 31, 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		$	0.3		$	0.3
Interest cost	27.5			13.4			14.1			2.6			1.4			1.2
Expected return on plan assets	(27.1		)	(13.7		)	(12.3		)	(2.4		)	(1.7		)	(0.7		)
Prior service cost	0.5			0.4			0.2			0.1			0.1			—
Recognized net actuarial (gain)/loss	6.9			6.4			12.2			(0.3		)	(0.1		)	(0.4		)
Net periodic benefit costs before regulatory adjustment and intercompany allocations	26.9			13.8			26.0			0.6			—			0.4
Regulatory adjustment	(0.1		)	0.5			(0.6		)	(0.7		)	(0.8		)	0.1
Intercompany allocations	—			—			(6.9		)	—			—			(0.1		)
Net periodic benefit costs (income)	$	26.8		$	14.3		$	18.5		$	(0.1	)	$	(0.8	)	$	0.4