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TAXES - Income Tax Expense (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Current Federal Tax Expense (Benefit) $ 5.0 $ 11.5
Current State and Local Tax Expense (Benefit) 4.7 (0.4)
Current Income Tax Expense (Benefit), Total 9.7 11.1
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Deferred Federal Income Tax Expense (Benefit) 7.7 (3.9)
Deferred State and Local Income Tax Expense (Benefit) (3.3) 3.2
Deferred Income Tax Expense (Benefit), Total 4.4 (0.7)
Investment Tax Credits    
Deferral 0.0 2.7
Amortization (1.7) (1.6)
Total (1.7) 1.1
Income Tax Expense (Benefit), Total $ 12.4 $ 11.5
Effective Income Tax Rate Reconciliation, Percent [Abstract]    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00%
Effect Of [Abstract]    
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Life Insurance, Percent (1.40%) (0.50%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 0.60% 1.40%
EffectiveIncomeTaxRateReconciliationEffectOfRegulatoryTreatmentBookTaxDifferences (7.70%) (6.30%)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent (3.50%) (3.70%)
Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent (0.30%) (0.30%)
EffectiveIncomeTaxRateReconciliationAFUDCEquity (0.60%) (0.50%)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent (0.60%) (0.20%)
Stock compensation 0.10% (0.90%)
Officer compensation limitation 0.20% 0.30%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent 0.10% (1.90%)
Effective Income Tax Rate Reconciliation, Percent, Total 7.90% 8.40%
Evergy Kansas Central    
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Current Federal Tax Expense (Benefit) $ 18.1 $ 7.9
Current State and Local Tax Expense (Benefit) 2.0 0.2
Current Income Tax Expense (Benefit), Total 20.1 8.1
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Deferred Federal Income Tax Expense (Benefit) (10.0) (8.5)
Deferred State and Local Income Tax Expense (Benefit) (0.7) 2.3
Deferred Income Tax Expense (Benefit), Total (10.7) (6.2)
Investment Tax Credits    
Deferral 0.0 2.7
Amortization (1.0) (1.0)
Total (1.0) 1.7
Income Tax Expense (Benefit), Total $ 8.4 $ 3.6
Effective Income Tax Rate Reconciliation, Percent [Abstract]    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00%
Effect Of [Abstract]    
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Life Insurance, Percent (2.40%) (1.00%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 0.70% 2.00%
EffectiveIncomeTaxRateReconciliationEffectOfRegulatoryTreatmentBookTaxDifferences (4.00%) (5.00%)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent (6.30%) (7.70%)
Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent (0.50%) (0.60%)
EffectiveIncomeTaxRateReconciliationAFUDCEquity (0.50%) (0.70%)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent (0.40%) 0.10%
Stock compensation (0.20%) (0.60%)
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent 0.00% (2.90%)
Effective Income Tax Rate Reconciliation, Percent, Total 7.40% 4.60%
Evergy Metro    
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Current Federal Tax Expense (Benefit) $ (5.1) $ 9.4
Current State and Local Tax Expense (Benefit) 1.6 0.1
Current Income Tax Expense (Benefit), Total (3.5) 9.5
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Deferred Federal Income Tax Expense (Benefit) 12.4 (1.6)
Deferred State and Local Income Tax Expense (Benefit) (1.2) 0.4
Deferred Income Tax Expense (Benefit), Total 11.2 (1.2)
Investment Tax Credits    
Amortization (0.8) (0.6)
Total (0.8) (0.6)
Income Tax Expense (Benefit), Total $ 6.9 $ 7.7
Effective Income Tax Rate Reconciliation, Percent [Abstract]    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00%
Effect Of [Abstract]    
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Life Insurance, Percent (0.10%) (0.20%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 0.60% 0.60%
EffectiveIncomeTaxRateReconciliationEffectOfRegulatoryTreatmentBookTaxDifferences (8.10%) (7.00%)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent (0.20%) (0.20%)
EffectiveIncomeTaxRateReconciliationAFUDCEquity (0.90%) (0.40%)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent (0.90%) (0.60%)
Stock compensation 1.00% (1.30%)
Officer compensation limitation 0.60% 0.50%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent (0.10%) 0.00%
Effective Income Tax Rate Reconciliation, Percent, Total 12.90% 12.40%