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EQUITY COMPENSATION - Income Tax Benefit (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity compensation expense | $ 15.5 | $ 15.5 | $ 30.7
Income tax benefit | 2.2 | 3.0 | 1.4
Evergy Kansas Central |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity compensation expense | 7.6 | 6.7 | 24.8
Income tax benefit | 1.6 | 1.9 | 1.4
Evergy Metro |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity compensation expense | 5.7 | 5.7 | 6.5
Income tax benefit | $ 0.2 | $ 0.3 | $ 0.1

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