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PROPERTY, PLANT AND EQUIPMENT - Depreciation Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense | $ 943.3 | $ 836.1 | $ 813.6
Variable Interest Entities |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense | 7.1 | 7.1 | 7.1
Evergy Kansas Central |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense | 497.7 | 468.2 | 450.3
Evergy Metro |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense | $ 319.7 | $ 261.7 | $ 255.9

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-1 + Details
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