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Derivative Instruments Offsetting Assets (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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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

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