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RATE MATTERS AND REGULATION - Narrative (Details) $ in Millions |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2023 USD ($) | Feb. 28, 2024 USD ($) | Sep. 30, 2023 USD ($) | May 31, 2023 USD ($) | Apr. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  | $ 2,087.4 | $ 2,214.3
Regulatory liabilities |  |  |  |  |  | $ 2,725.5 | 2,722.2
Interest rate |  |  |  |  |  | 5.06% |
TFR Refund |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Regulatory liabilities |  |  |  |  |  | $ 11.2 | 55.5
Fuel recovery mechanisms |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Regulatory liabilities |  |  |  |  |  | $ 34.7 | 4.7
Regulatory Liability, Amortization Period |  |  |  |  |  | 1 year |
February 2021 winter weather event |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  | $ 403.5 | 430.9
Evergy Kansas Central |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  | 632.9 | 711.9
Regulatory liabilities |  |  |  |  |  | 1,536.5 | 1,441.0
Evergy Kansas Central | TFR Refund |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Regulatory liabilities |  |  |  |  |  | 11.2 | 55.5
Evergy Kansas Central | Fuel recovery mechanisms |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Regulatory liabilities |  |  |  |  |  | 34.7 | 4.5
Evergy Kansas Central | February 2021 winter weather event |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  | 79.7 | 121.9
Evergy Metro |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  | 434.0 | 373.8
Regulatory liabilities |  |  |  |  |  | 903.2 | 928.1
Evergy Metro | TFR Refund |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Regulatory liabilities |  |  |  |  |  | 0.0 | 0.0
Evergy Metro | Fuel recovery mechanisms |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Regulatory liabilities |  |  |  |  |  | 0.0 | 0.2
Evergy Metro | February 2021 winter weather event |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  | $ 0.0 | 0.0
Evergy Metro | Missouri Public Service Commission |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Public Utilities, Recovery Mechanism's Sharing Percentage for Fuel Cost |  |  |  |  |  | 0.05 |
Evergy Missouri West | Missouri Public Service Commission |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Public Utilities, Recovery Mechanism Percent for Fuel Cost |  |  |  |  |  | 0.95 |
La Cygne Station | Evergy Kansas South Inc |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
VIE ownership percentage |  |  |  |  |  | 50.00% |
2023 Rate case proceedings | Evergy Kansas Central |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Annual revenue rate increase (decrease), requested |  |  |  |  | $ 204.0 |  |
Jointly owned utility plant, proportionate ownership share |  |  | 8.00% |  | 8.00% |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  | $ 74.0 |  |  |  |
Public Utilities, Approved Rate Increase Decrease, Amount, Wind Farm | $ 18.6 |  |  |  |  |  |
Cost of investment in renewable generation, net of cash acquired |  |  |  |  | $ 220.9 |  |
Annual wind farm revenue rate increase (decrease), requested | $ 18.6 |  |  |  | $ 21.5 |  |
Deferral of revenues to regulatory liability for refund to customers for COLI rate credits |  |  | 96.5 |  |  |  |
Return on equity, requested |  |  |  |  | 10.25% |  |
Rate-making equity ratio, requested |  |  |  |  | 52.00% |  |
Persimmon Creek costs recovery period | 20 years |  |  |  |  |  |
2023 Rate case proceedings | Evergy Kansas Central | COLI Rate Credits for Refund |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Regulatory Liability, Amortization Period | 3 years |  |  |  |  |  |
2023 Rate case proceedings | Evergy Metro |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Annual revenue rate increase (decrease), requested |  |  |  |  | $ 14.0 |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  | $ (32.9) |  |  |  |
Return on equity, requested |  |  |  |  | 10.25% |  |
Rate-making equity ratio, requested |  |  |  |  | 52.00% |  |
2018 Rate Case Proceedings | Evergy Kansas Central | Kansas Corporation Commission |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Refund percent on earnings over approved return on equity |  |  |  |  |  | 0.50 |
Approved return on equity, percentage |  |  |  |  |  | 9.30% |
Estimated refund on earnings over approved return on equity |  |  |  |  |  | $ 0.0 |
2018 Rate Case Proceedings | Evergy Metro | Kansas Corporation Commission |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Refund percent on earnings over approved return on equity |  |  |  |  |  | 0.50 |
Approved return on equity, percentage |  |  |  |  |  | 9.30% |
Estimated refund on earnings over approved return on equity |  |  |  |  |  | $ 16.7 |
Revised estimated refund on earnings over approved return on equity |  |  |  |  |  | 6.0 |
Ordered refund on earnings over approved return on equity |  |  |  |  |  | 6.0 |
Transmission delivery charge | Evergy Kansas Central | Kansas Corporation Commission |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  | $ (22.3) |  |  |
Transmission delivery charge | Evergy Metro | Kansas Corporation Commission |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  | $ 4.0 |  |  |
2024 Rate case proceedings | Evergy Kansas Central | Federal Energy Regulatory Commission |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Annual transmissions revenue estimated amount of increase (decrease) over prior year |  |  |  |  |  | 115.8 |
FERC 2024 TFR Proceeding | Evergy Metro | Federal Energy Regulatory Commission |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Annual transmissions revenue estimated amount of increase (decrease) over prior year |  |  |  |  |  | 23.7 |
FERC 2023 TFR Proceeding | TFR Refund |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Regulatory liabilities |  |  |  |  |  |  | 32.8
FERC 2023 TFR Proceeding | Evergy Kansas Central | Federal Energy Regulatory Commission |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Annual transmissions revenue estimated amount of increase (decrease) over prior year |  |  |  |  |  | (21.7) |
FERC 2023 TFR Proceeding | Evergy Metro | Federal Energy Regulatory Commission |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Annual transmissions revenue estimated amount of increase (decrease) over prior year |  |  |  |  |  | 8.6 |
FERC 2022 TFR Proceeding | Evergy Kansas Central | Federal Energy Regulatory Commission |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Annual transmissions revenue estimated amount of increase (decrease) over prior year |  |  |  |  |  | 33.2 |
FERC 2022 TFR Proceeding | Evergy Metro | Federal Energy Regulatory Commission |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Annual transmissions revenue estimated amount of increase (decrease) over prior year |  |  |  |  |  | 18.1 |
2021 MPSC Winter Weather Qualified Extraordinary Costs Securitization | Evergy Missouri West | 2021 Winter Weather Qualified Extraordinary Costs Securitization |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  | $ 323.8 | $ 309.0
Subsequent Event | Evergy Missouri West |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Regulatory Asset, Amortization Period |  | 15 years |  |  |  |  |
Subsequent Event | 2024 Rate case proceedings | Evergy Missouri West |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Annual revenue rate increase (decrease), requested |  | $ 104.0 |  |  |  |  |
Return on equity, requested |  | 10.50% |  |  |  |  |
Rate-making equity ratio, requested |  | 52.00% |  |  |  |  |
Subsequent Event | 2021 MPSC Winter Weather Qualified Extraordinary Costs Securitization | Evergy Missouri West | Maximum |  |  |  |  |  |  |
Regulatory Proceedings [Line Items] |  |  |  |  |  |  |
Regulatory Asset, Amortization Period |  | 17 years |  |  |  |  |

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