Derivative Instruments Offsetting Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset [Abstract]
Derivative Liability, Current	$ 6.4	$ 11.6
Derivative Liability, Noncurrent	$ 38.3	$ 33.8
Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other	Other
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other	Other
Not Designated as Hedging Instrument [Member]
Derivative, Fair Value, Net [Abstract]
Derivative Liability, Fair Value, Gross Liability	$ 82.5	$ 128.8
Power commodity contract noncurrent \| Not Designated as Hedging Instrument [Member]
Derivative, Fair Value, Net [Abstract]
Derivative Liability, Fair Value, Gross Liability	39.6	32.9
Commodity contract current
Derivative, Fair Value, Net [Abstract]
Derivative Liability, Fair Value, Gross Liability	36.5	89.1
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset [Abstract]
FIN 39 Derivative liability netting	(30.1)	(77.5)
Commodity contract noncurrent
Derivative, Fair Value, Net [Abstract]
Derivative Liability, Fair Value, Gross Liability	46.0	39.7
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset [Abstract]
FIN 39 Derivative liability netting	(7.7)	(5.9)
Power commodity contract current \| Not Designated as Hedging Instrument [Member]
Derivative, Fair Value, Net [Abstract]
Derivative Liability, Fair Value, Gross Liability	9.0	21.0
Natural gas commodity contract current \| Not Designated as Hedging Instrument [Member]
Derivative, Fair Value, Net [Abstract]
Derivative Liability, Fair Value, Gross Liability	27.5	68.1
Natural gas commodity contract noncurrent \| Not Designated as Hedging Instrument [Member]
Derivative, Fair Value, Net [Abstract]
Derivative Liability, Fair Value, Gross Liability	6.4	6.8
Evergy Kansas Central
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset [Abstract]
Derivative Liability, Current	6.4	6.9
Derivative Liability, Noncurrent	38.3	33.8
Evergy Kansas Central \| Not Designated as Hedging Instrument [Member]
Derivative, Fair Value, Net [Abstract]
Derivative Liability, Fair Value, Gross Liability	81.3	121.0
Evergy Kansas Central \| Power commodity contract noncurrent \| Not Designated as Hedging Instrument [Member]
Derivative, Fair Value, Net [Abstract]
Derivative Liability, Fair Value, Gross Liability	39.6	32.9
Evergy Kansas Central \| Commodity contract current
Derivative, Fair Value, Net [Abstract]
Derivative Liability, Fair Value, Gross Liability	35.3	81.3
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset [Abstract]
FIN 39 Derivative liability netting	(28.9)	(74.4)
Evergy Kansas Central \| Commodity contract noncurrent
Derivative, Fair Value, Net [Abstract]
Derivative Liability, Fair Value, Gross Liability	46.0	39.7
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset [Abstract]
FIN 39 Derivative liability netting	(7.7)	(5.9)
Evergy Kansas Central \| Power commodity contract current \| Not Designated as Hedging Instrument [Member]
Derivative, Fair Value, Net [Abstract]
Derivative Liability, Fair Value, Gross Liability	7.8	14.3
Evergy Kansas Central \| Natural gas commodity contract current \| Not Designated as Hedging Instrument [Member]
Derivative, Fair Value, Net [Abstract]
Derivative Liability, Fair Value, Gross Liability	27.5	67.0
Evergy Kansas Central \| Natural gas commodity contract noncurrent \| Not Designated as Hedging Instrument [Member]
Derivative, Fair Value, Net [Abstract]
Derivative Liability, Fair Value, Gross Liability	6.4	6.8
Evergy Metro
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset [Abstract]
Derivative Liability, Current	0.0	3.6
Derivative Liability, Noncurrent	0.0	0.0
Evergy Metro \| Not Designated as Hedging Instrument [Member]
Derivative, Fair Value, Net [Abstract]
Derivative Liability, Fair Value, Gross Liability	1.0	5.7
Evergy Metro \| Commodity contract current
Derivative, Fair Value, Net [Abstract]
Derivative Liability, Fair Value, Gross Liability	1.0	5.7
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset [Abstract]
FIN 39 Derivative liability netting	(1.0)	(2.1)
Evergy Metro \| Commodity contract noncurrent
Derivative, Fair Value, Net [Abstract]
Derivative Liability, Fair Value, Gross Liability	0.0	0.0
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset [Abstract]
FIN 39 Derivative liability netting	0.0	0.0
Evergy Metro \| Natural gas commodity contract current \| Not Designated as Hedging Instrument [Member]
Derivative, Fair Value, Net [Abstract]
Derivative Liability, Fair Value, Gross Liability	$ 1.0	$ 5.7

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value of asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, and right to receive cash collateral under master netting arrangements.

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Indicates line item in statement of financial position that includes derivative liability classified as noncurrent.

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