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Derivative Instruments Gain and Losses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract] |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ 22.9 | $ 84.6 | $ 117.5
Commodity Contract [Member] |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract] |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | 22.9 | 84.6 | 117.5
Evergy Kansas Central |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract] |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | 22.9 | 84.6 | 117.5
Evergy Kansas Central | Commodity Contract [Member] |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract] |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ 22.9 | $ 84.6 | $ 117.5

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4C Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 4CC -SubTopic 10 -Topic 815 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4CC + Details
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