Derivative Instruments - Notional Amounts (Details) MWh in Millions, MMBTU in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2026 USD ($) MWh MMBTU	Jun. 30, 2025 MMBTU MWh	Dec. 31, 2025 USD ($)
Interest Rate Swap [Member] \| Designated as Hedging Instrument [Member]
Price Risk Derivatives [Abstract]
Notional amount \| $	$ 100.0		$ 100.0
Natural gas commodity contract \| Not Designated as Hedging Instrument [Member]
Price Risk Derivatives [Abstract]
Notional amount \| MMBTU	101.6	54.6
Power commodity contract \| Not Designated as Hedging Instrument [Member]
Price Risk Derivatives [Abstract]
Notional amount	133.8	63.0
Evergy Kansas Central \| Natural gas commodity contract \| Not Designated as Hedging Instrument [Member]
Price Risk Derivatives [Abstract]
Notional amount \| MMBTU	101.6	54.6
Evergy Kansas Central \| Power commodity contract \| Not Designated as Hedging Instrument [Member]
Price Risk Derivatives [Abstract]
Notional amount	79.3	41.0
Evergy Metro \| Power commodity contract \| Not Designated as Hedging Instrument [Member]
Price Risk Derivatives [Abstract]
Notional amount	40.6	16.5