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LONG-TERM DEBT - Narrative (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) $ / shares | Dec. 31, 2023 USD ($) $ / shares | Feb. 28, 2024 USD ($) | Nov. 30, 2023 USD ($) | May 31, 2023 USD ($) | Apr. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate | 5.06% | 5.06% |  |  |  |  |  |
Convertible Notes Due 2027 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross | $ 1,400.0 | $ 1,400.0 |  |  |  |  |  |
Interest rate | 4.50% | 4.50% |  |  |  |  |  |
Secured Debt | Mortgage Bonds Due 2053 EKC |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross | $ 400.0 | $ 400.0 |  |  |  |  |  |
Interest rate | 5.70% | 5.70% |  |  |  |  |  |
Secured Debt | Mortgage Bonds Due 2033 EM |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross | $ 300.0 | $ 300.0 |  |  |  |  |  |
Interest rate | 4.95% | 4.95% |  |  |  |  |  |
Secured Debt | Mortgage Bonds Due 2023 EKS |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  |  |  | $ 50.0
Interest rate |  |  |  |  |  |  |  | 6.15%
Secured Debt | Mortgage Bonds Due 2033 EKC |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross | $ 300.0 | $ 300.0 |  |  |  |  |  |
Interest rate | 5.90% | 5.90% |  |  |  |  |  |
Secured Debt | EIRR Bonds Due 2026 EM |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross | $ 79.5 | $ 79.5 |  |  |  |  |  |
Interest rate | 4.30% | 4.30% |  |  |  |  |  |
Secured Debt | Mortgage Bonds Due 2023 EM |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  |  |  | $ 79.5
Interest rate |  |  |  |  |  |  |  | 2.95%
Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, priority debt percentage of tangible net worth, maximum | 15.00% | 15.00% |  |  |  |  |  |
Senior Notes | Series Notes Due 2023 EM |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  |  |  | $ 300.0
Interest rate |  |  |  |  |  |  |  | 3.15%
Senior Notes | Senior Notes Due 2024 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross | $ 800.0 | $ 800.0 |  |  |  |  |  | $ 800.0
Interest rate | 2.45% | 2.45% |  |  |  |  |  | 2.45%
Senior Notes | Senior Notes Due 2029 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross | $ 800.0 | $ 800.0 |  |  |  |  |  | $ 800.0
Interest rate | 2.90% | 2.90% |  |  |  |  |  | 2.90%
Term Loan Facility | Line Of Credit Facility Classified As Long Term Debt 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross | $ 500.0 | $ 500.0 |  |  |  |  |  | $ 500.0
Convertible Notes Payable | Convertible Notes Due 2027 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross | $ 1,400.0 | $ 1,400.0 |  |  |  |  |  |
Interest rate | 4.50% | 4.50% |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Trading Days | 20 |  |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Consecutive Trading Days | 30 |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio | 16.1809 |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price | $ / shares | $ 61.80 | $ 61.80 |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 100.00% |  |  |  |  |  |
Convertible Notes Payable | Convertible Notes Due 2027 over-allotmnent |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross | $ 200.0 | $ 200.0 |  |  |  |  |  |
Debt conversion terms one | Convertible Notes Payable | Convertible Notes Due 2027 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger | 130.00% |  |  |  |  |  |  |
Debt conversion terms two | Convertible Notes Payable | Convertible Notes Due 2027 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger | 98.00% |  |  |  |  |  |  |
Evergy Kansas Central |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
AdditionalPrincipalFirstMortgageBondsAvailableToBeIssued |  | 518.6 |  |  |  |  |  |
Evergy Kansas Central | Secured Debt | Mortgage Bonds Due 2053 EKC |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross | $ 400.0 | 400.0 |  |  |  |  | $ 400.0 |
Interest rate |  |  |  |  |  |  | 5.70% |
Evergy Kansas Central | Secured Debt | Mortgage Bonds Due 2033 EM |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross | 0.0 | 0.0 |  |  |  |  |  |
Evergy Kansas Central | Secured Debt | Mortgage Bonds Due 2023 EKS |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  | $ 50.0 |  |  | 50.0
Interest rate |  |  |  |  | 6.15% |  |  |
Evergy Kansas Central | Secured Debt | Mortgage Bonds Due 2033 EKC |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross | 300.0 | 300.0 |  | $ 300.0 |  |  |  |
Interest rate |  |  |  | 5.90% |  |  |  |
Evergy Kansas Central | Secured Debt | EIRR Bonds Due 2026 EM |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross | 0.0 | 0.0 |  |  |  |  |  |
Evergy Kansas Central | Secured Debt | Mortgage Bonds Due 2023 EM |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  |  |  | 0.0
Evergy Kansas Central | Senior Notes | Series Notes Due 2023 EM |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  |  |  | 0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2024 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross | 0.0 | 0.0 |  |  |  |  |  | 0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2029 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross | 0.0 | 0.0 |  |  |  |  |  | 0.0
Evergy Kansas Central | Term Loan Facility | Line Of Credit Facility Classified As Long Term Debt 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  |  |  | 0.0
Evergy Kansas Central | Convertible Notes Payable | Convertible Notes Due 2027 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross | $ 0.0 | 0.0 |  |  |  |  |  |
Evergy Metro |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
AdditionalPrincipalFirstMortgageBondsAvailableToBeIssued |  | $ 5,548.5 |  |  |  |  |  |
Percentage of Bondable Property Allowed | 75.00% | 75.00% |  |  |  |  |  |
Evergy Metro | Secured Debt | Mortgage Bonds Due 2053 EKC |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross | $ 0.0 | $ 0.0 |  |  |  |  |  |
Evergy Metro | Secured Debt | Mortgage Bonds Due 2033 EM |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross | 300.0 | 300.0 |  |  |  | $ 300.0 |  |
Interest rate |  |  |  |  |  | 4.95% |  |
Evergy Metro | Secured Debt | Mortgage Bonds Due 2023 EKS |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  |  |  | 0.0
Evergy Metro | Secured Debt | Mortgage Bonds Due 2033 EKC |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross | 0.0 | 0.0 |  |  |  |  |  |
Evergy Metro | Secured Debt | EIRR Bonds Due 2026 EM |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross | $ 79.5 | $ 79.5 |  |  |  |  |  |
Interest rate | 4.30% | 4.30% |  |  |  |  |  |
Evergy Metro | Secured Debt | Mortgage Bonds Due 2023 EM |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross | $ 79.5 | $ 79.5 |  |  |  |  |  | 79.5
Interest rate | 2.95% | 2.95% |  |  |  |  |  |
Evergy Metro | Senior Notes | Series Notes Due 2023 EM |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  |  | $ 300.0 | 300.0
Interest rate |  |  |  |  |  |  | 3.15% |
Evergy Metro | Senior Notes | Senior Notes Due 2024 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross | $ 0.0 | $ 0.0 |  |  |  |  |  | 0.0
Evergy Metro | Senior Notes | Senior Notes Due 2029 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross | 0.0 | 0.0 |  |  |  |  |  | 0.0
Evergy Metro | Term Loan Facility | Line Of Credit Facility Classified As Long Term Debt 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  |  |  | $ 0.0
Evergy Metro | Convertible Notes Payable | Convertible Notes Due 2027 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross | $ 0.0 | 0.0 |  |  |  |  |  |
Evergy Missouri West |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
AdditionalPrincipalFirstMortgageBondsAvailableToBeIssued |  | $ 2,158.7 |  |  |  |  |  |
Evergy Missouri West | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, debt to capitalization ratio (no more than) | 65.00% | 65.00% |  |  |  |  |  |
Evergy Missouri West | Subsequent Event | Securitized Bonds | SecuritizedBondsDue2040EMW [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt gross |  |  | $ 331.1 |  |  |  |  |
Interest rate |  |  | 5.10% |  |  |  |  |
Evergy Kansas South Inc |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum Amount Of First Mortgage Bonds Authorized | $ 3,500.0 | $ 3,500.0 |  |  |  |  |  |
AdditionalPrincipalFirstMortgageBondsAvailableToBeIssued |  | $ 2,878.6 |  |  |  |  |  |

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