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RECEIVABLES - Other Receivables (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Other receivables, contracts with customers | $ 57.5 | $ 42.0
Evergy Kansas Central |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Other receivables, contracts with customers | 49.9 | 37.7
Evergy Metro |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Other receivables, contracts with customers | $ 6.9 | $ 1.2

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- Definition The amount of other receivables resulting from contracts with customers. + References No definition available. + Details
Name: | evrg_OtherReceivablesContractsWithCustomers
Namespace Prefix: | evrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition 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. + References No definition available. + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=evrg_EvergyKansasCentralIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=evrg_EvergyMetroIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |