Derivative Instruments Offsetting Assets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
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	$ 12.9	$ 25.2
Derivative Asset, Noncurrent	$ 29.8	$ 25.1
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	$ 133.0	$ 329.8
Commodity contract current
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Fair Value, Gross Asset	91.3	262.6
FIN 39 Derivative asset netting
Gross amounts offset	(78.4)	(237.4)
Commodity contract noncurrent
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Fair Value, Gross Asset	41.7	67.2
FIN 39 Derivative asset netting
Gross amounts offset	(11.9)	(42.1)
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	23.2	41.6
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	35.7	65.6
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	68.1	221.0
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	6.0	1.6
Evergy Kansas Central
FIN 39 Derivative asset netting
Derivative Asset, Current	11.1	24.8
Derivative Asset, Noncurrent	29.8	25.1
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	128.1	324.9
Evergy Kansas Central \| Commodity contract current
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Fair Value, Gross Asset	86.4	257.7
FIN 39 Derivative asset netting
Gross amounts offset	(75.3)	(232.9)
Evergy Kansas Central \| Commodity contract noncurrent
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Fair Value, Gross Asset	41.7	67.2
FIN 39 Derivative asset netting
Gross amounts offset	(11.9)	(42.1)
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	18.3	36.7
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	35.7	65.6
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	68.1	221.0
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	6.0	1.6
Evergy Metro
FIN 39 Derivative asset netting
Derivative Asset, Current	0.0	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	2.1	3.5
Evergy Metro \| Commodity contract current
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Fair Value, Gross Asset	2.1	3.5
FIN 39 Derivative asset netting
Gross amounts offset	(2.1)	(3.5)
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	$ 2.1	$ 3.5

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

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