Derivative Instruments Offsetting Assets (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
FIN 39 Derivative asset netting
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other	Other
Derivative Asset, Current	$ 11.0	$ 12.9
Derivative Asset, Noncurrent	$ 36.6	$ 29.8
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other	Other
Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other	Other
Not Designated as Hedging Instrument [Member]
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Fair Value, Gross Asset	$ 89.8	$ 133.0
Commodity contract current
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Fair Value, Gross Asset	42.0	91.3
FIN 39 Derivative asset netting
Gross amounts offset	(31.0)	(78.4)
Commodity contract noncurrent
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Fair Value, Gross Asset	47.8	41.7
FIN 39 Derivative asset netting
Gross amounts offset	(11.2)	(11.9)
Power commodity contract current \| Not Designated as Hedging Instrument [Member]
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Fair Value, Gross Asset	15.3	23.2
Power commodity contract noncurrent \| Not Designated as Hedging Instrument [Member]
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Fair Value, Gross Asset	42.2	35.7
Natural gas commodity contract current \| Not Designated as Hedging Instrument [Member]
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Fair Value, Gross Asset	26.7	68.1
Natural gas commodity contract noncurrent \| Not Designated as Hedging Instrument [Member]
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Fair Value, Gross Asset	5.6	6.0
Evergy Kansas Central
FIN 39 Derivative asset netting
Derivative Asset, Current	7.4	11.1
Derivative Asset, Noncurrent	36.7	29.8
Evergy Kansas Central \| Not Designated as Hedging Instrument [Member]
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Fair Value, Gross Asset	85.1	128.1
Evergy Kansas Central \| Commodity contract current
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Fair Value, Gross Asset	37.2	86.4
FIN 39 Derivative asset netting
Gross amounts offset	(29.8)	(75.3)
Evergy Kansas Central \| Commodity contract noncurrent
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Fair Value, Gross Asset	47.9	41.7
FIN 39 Derivative asset netting
Gross amounts offset	(11.2)	(11.9)
Evergy Kansas Central \| Power commodity contract current \| Not Designated as Hedging Instrument [Member]
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Fair Value, Gross Asset	10.5	18.3
Evergy Kansas Central \| Power commodity contract noncurrent \| Not Designated as Hedging Instrument [Member]
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Fair Value, Gross Asset	42.3	35.7
Evergy Kansas Central \| Natural gas commodity contract current \| Not Designated as Hedging Instrument [Member]
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Fair Value, Gross Asset	26.7	68.1
Evergy Kansas Central \| Natural gas commodity contract noncurrent \| Not Designated as Hedging Instrument [Member]
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Fair Value, Gross Asset	5.6	6.0
Evergy Metro
FIN 39 Derivative asset netting
Derivative Asset, Current	1.6	0.0
Derivative Asset, Noncurrent	0.0	0.0
Evergy Metro \| Not Designated as Hedging Instrument [Member]
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Fair Value, Gross Asset	2.6	2.1
Evergy Metro \| Commodity contract current
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Fair Value, Gross Asset	2.6	2.1
FIN 39 Derivative asset netting
Gross amounts offset	(1.0)	(2.1)
Evergy Metro \| Commodity contract noncurrent
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Fair Value, Gross Asset	0.0	0.0
FIN 39 Derivative asset netting
Gross amounts offset	0.0	0.0
Evergy Metro \| Power commodity contract current \| Not Designated as Hedging Instrument [Member]
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Fair Value, Gross Asset	$ 2.6	$ 2.1

Indicates line item in statement of financial position that includes derivative asset classified as current.

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Fair value of liability associated with financial asset or other 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 obligation to return cash collateral under master netting arrangements.

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