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Derivative Instruments Offsetting Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset [Abstract] |  |
Derivative Liability, Current | $ 11.6 | $ 25.8
Derivative Liability, Noncurrent | $ 33.8 | $ 26.7
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 | $ 128.8 | $ 322.9
Power commodity contract noncurrent | Not Designated as Hedging Instrument [Member] |  |
Derivative, Fair Value, Net [Abstract] |  |
Derivative Liability, Fair Value, Gross Liability | 32.9 | 61.5
Commodity contract current |  |
Derivative, Fair Value, Net [Abstract] |  |
Derivative Liability, Fair Value, Gross Liability | 89.1 | 259.8
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset [Abstract] |  |
FIN 39 Derivative liability netting | (77.5) | (234.0)
Commodity contract noncurrent |  |
Derivative, Fair Value, Net [Abstract] |  |
Derivative Liability, Fair Value, Gross Liability | 39.7 | 63.1
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset [Abstract] |  |
FIN 39 Derivative liability netting | (5.9) | (36.4)
Power commodity contract current | Not Designated as Hedging Instrument [Member] |  |
Derivative, Fair Value, Net [Abstract] |  |
Derivative Liability, Fair Value, Gross Liability | 21.0 | 41.0
Natural gas commodity contract current | Not Designated as Hedging Instrument [Member] |  |
Derivative, Fair Value, Net [Abstract] |  |
Derivative Liability, Fair Value, Gross Liability | 68.1 | 218.8
Natural gas commodity contract noncurrent | Not Designated as Hedging Instrument [Member] |  |
Derivative, Fair Value, Net [Abstract] |  |
Derivative Liability, Fair Value, Gross Liability | 6.8 | 1.6
Evergy Kansas Central |  |
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset [Abstract] |  |
Derivative Liability, Current | 6.9 | 21.3
Derivative Liability, Noncurrent | 33.8 | 26.7
Evergy Kansas Central | Not Designated as Hedging Instrument [Member] |  |
Derivative, Fair Value, Net [Abstract] |  |
Derivative Liability, Fair Value, Gross Liability | 121.0 | 313.8
Evergy Kansas Central | Power commodity contract noncurrent | Not Designated as Hedging Instrument [Member] |  |
Derivative, Fair Value, Net [Abstract] |  |
Derivative Liability, Fair Value, Gross Liability | 32.9 | 61.5
Evergy Kansas Central | Commodity contract current |  |
Derivative, Fair Value, Net [Abstract] |  |
Derivative Liability, Fair Value, Gross Liability | 81.3 | 250.7
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset [Abstract] |  |
FIN 39 Derivative liability netting | (74.4) | (229.4)
Evergy Kansas Central | Commodity contract noncurrent |  |
Derivative, Fair Value, Net [Abstract] |  |
Derivative Liability, Fair Value, Gross Liability | 39.7 | 63.1
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset [Abstract] |  |
FIN 39 Derivative liability netting | (5.9) | (36.4)
Evergy Kansas Central | Power commodity contract current | Not Designated as Hedging Instrument [Member] |  |
Derivative, Fair Value, Net [Abstract] |  |
Derivative Liability, Fair Value, Gross Liability | 14.3 | 35.6
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 | 67.0 | 215.1
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 | 6.8 | 1.6
Evergy Metro |  |
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset [Abstract] |  |
Derivative Liability, Current | 3.6 | 0.6
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 | 5.7 | 4.1
Evergy Metro | Commodity contract current |  |
Derivative, Fair Value, Net [Abstract] |  |
Derivative Liability, Fair Value, Gross Liability | 5.7 | 4.1
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset [Abstract] |  |
FIN 39 Derivative liability netting | (2.1) | (3.5)
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 | $ 5.7 | $ 4.1

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