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SHORT-TERM BORROWINGS AND SHORT-TERM BANK LINES OF CREDIT - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2023	Feb. 28, 2023	Dec. 31, 2022	Feb. 28, 2022
Short-term Debt [Line Items]
Interest rate	5.06%
Convertible Notes Due 2027
Short-term Debt [Line Items]
Long-term debt gross	$ 1,400.0
Interest rate	4.50%
Cash Borrowings
Short-term Debt [Line Items]
Line of credit, maximum borrowing capacity	$ 2,500.0
Debt instrument, debt default, threshold	$ 100.0
Debt Instrument, debt to capitalization ratio (no more than)	65.00%
Line of credit	$ 0.0		$ 0.0
Term Loan Facility | Unsecured Debt
Short-term Debt [Line Items]
Line of credit, maximum borrowing capacity		$ 500.0		$ 500.0
Commercial Paper
Short-term Debt [Line Items]
LineOfCreditFacilityClassifiedasLongTermDebt	500.0		500.0
Line of credit	951.8		1,332.3
Evergy Kansas Central | Cash Borrowings
Short-term Debt [Line Items]
Debt instrument, debt default, threshold	$ 100.0
Debt Instrument, debt to capitalization ratio (no more than)	65.00%
Line of credit	$ 0.0		0.0
Evergy Kansas Central | Commercial Paper
Short-term Debt [Line Items]
Line of credit	230.4		772.1
Evergy Metro | Cash Borrowings
Short-term Debt [Line Items]
Debt instrument, debt default, threshold	$ 100.0
Debt Instrument, debt to capitalization ratio (no more than)	65.00%
Line of credit	$ 0.0		0.0
Evergy Metro | Commercial Paper
Short-term Debt [Line Items]
Line of credit	423.3		111.0
Evergy Missouri West | Cash Borrowings
Short-term Debt [Line Items]
Debt instrument, debt default, threshold	$ 100.0
Debt Instrument, debt to capitalization ratio (no more than)	65.00%
Line of credit	$ 0.0		0.0
Evergy Missouri West | Commercial Paper
Short-term Debt [Line Items]
Line of credit	298.1		449.2
Evergy, Inc. | Cash Borrowings
Short-term Debt [Line Items]
Line of credit	0.0		0.0
Evergy, Inc. | Commercial Paper
Short-term Debt [Line Items]
Line of credit	$ 0.0		$ 0.0

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Line Of Credit Facility Classified As Long Term Debt

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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