Derivative Instruments (Tables)

12 Months Ended

Dec. 31, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]

The gross notional contract amount by commodity type for derivative instruments is summarized in the following table.

		December 31
Non-hedging derivatives	Notional volume unit of measure	2023	2022
Evergy		(millions)
Commodity contracts
Power	MWhs	52.9	67.2
Natural gas	MMBtu	559.9	772.7
Evergy Kansas Central
Commodity contracts
Power	MWhs	32.1	41.6
Natural gas	MMBtu	558.7	769.6
Evergy Metro
Commodity contracts
Power	MWhs	15.1	18.2

Fair value of open derivative positions, gross values before netting agreements and netting of cash collateral [Table Text Block]

The fair values of Evergy's open derivative positions and balance sheet classifications are summarized in the following tables. The fair values below are gross values before netting agreements and netting of cash collateral.

		December 31
Evergy		2023		2022
Non-hedging derivatives	Balance sheet location
Commodity contracts		(millions)
Power	Other assets - current	$	23.2	$	41.6
	Other assets - long-term	35.7		65.6
Natural gas	Other assets - current	68.1		221.0
	Other assets - long-term	6.0		1.6
Total derivative assets		$	133.0	$	329.8
Commodity contracts
Power	Other liabilities - current	$	21.0	$	41.0
	Other liabilities - long-term	32.9		61.5
Natural gas	Other liabilities - current	68.1		218.8
	Other liabilities - long-term	6.8		1.6
Total derivative liabilities		$	128.8	$	322.9

		December 31
Evergy Kansas Central		2023		2022
Non-hedging derivatives	Balance sheet location
Commodity contracts		(millions)
Power	Other assets - current	$	18.3	$	36.7
	Other assets - long-term	35.7		65.6
Natural gas	Other assets - current	68.1		221.0
	Other assets - long-term	6.0		1.6
Total derivative assets		$	128.1	$	324.9
Commodity contracts
Power	Other liabilities - current	$	14.3	$	35.6
	Other liabilities - long-term	32.9		61.5
Natural gas	Other liabilities - current	67.0		215.1
	Other liabilities - long-term	6.8		1.6
Total derivative liabilities		$	121.0	$	313.8

		December 31
Evergy Metro		2023		2022
Non-hedging derivatives	Balance sheet location
Commodity contracts		(millions)
Power	Other assets - current	$	2.1	$	3.5
Total derivative assets		$	2.1	$	3.5
Commodity contracts
Power	Other liabilities - current	$	5.7	$	4.1
Total derivative liabilities		$	5.7	$	4.1

Offsetting Derivative Assets and Liabilities [Table Text Block]

The following tables present the line items on the Evergy Companies' consolidated balance sheets where derivative assets and liabilities are reported. The gross amounts offset in the tables below show the effect of master netting arrangements and include collateral posted to offset the net position.

December 31, 2023	Evergy		Evergy Kansas Central		Evergy Metro
Derivative Assets	(millions)
Current
Gross amounts recognized	$	91.3	$	86.4	$	2.1
Gross amounts offset	(78.4)		(75.3)		(2.1)
Net amounts presented in other assets - current	$	12.9	$	11.1	$	—
Long-Term
Gross amounts recognized	$	41.7	$	41.7	$	—
Gross amounts offset	(11.9)		(11.9)		—
Net amounts presented in other assets - long-term	$	29.8	$	29.8	$	—
Derivative Liabilities
Current
Gross amounts recognized	$	89.1	$	81.3	$	5.7
Gross amounts offset	(77.5)		(74.4)		(2.1)
Net amounts presented in other liabilities - current	$	11.6	$	6.9	$	3.6
Long-Term
Gross amounts recognized	$	39.7	$	39.7	$	—
Gross amounts offset	(5.9)		(5.9)		—
Net amounts presented in other liabilities - long-term	$	33.8	$	33.8	$	—

December 31, 2022	Evergy		Evergy Kansas Central		Evergy Metro
Derivative Assets	(millions)
Current
Gross amounts recognized	$	262.6	$	257.7	$	3.5
Gross amounts offset	(237.4)		(232.9)		(3.5)
Net amounts presented in other assets - current	$	25.2	$	24.8	$	—
Long-Term
Gross amounts recognized	$	67.2	$	67.2	$	—
Gross amounts offset	(42.1)		(42.1)		—
Net amounts presented in other assets - long-term	$	25.1	$	25.1	$	—
Derivative Liabilities
Current
Gross amounts recognized	$	259.8	$	250.7	$	4.1
Gross amounts offset	(234.0)		(229.4)		(3.5)
Net amounts presented in other liabilities - current	$	25.8	$	21.3	$	0.6
Long-Term
Gross amounts recognized	$	63.1	$	63.1	$	—
Gross amounts offset	(36.4)		(36.4)		—
Net amounts presented in other liabilities - long-term	$	26.7	$	26.7	$	—

Derivative Instruments, Gain (Loss) [Table Text Block]

The following table summarizes the amounts of gain (loss) recognized in income for the change in fair value of derivatives not designated as hedging instruments for the Evergy Companies.

Location of gain (loss)	Contract type	2023		2022		2021
Evergy		(millions)
Operating revenues	Commodity	$	22.9	$	84.6	$	117.5
Total		$	22.9	$	84.6	$	117.5
Evergy Kansas Central
Operating revenues	Commodity	$	22.9	$	84.6	$	117.5
Total		$	22.9	$	84.6	$	117.5