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TAXES - Net Operating Loss Carryforwards (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Operating Loss Carryforwards [Line Items]    
Deferred tax benefits $ 17.2 $ 25.4
Operating loss carryforwards of federal income tax benefit 7.1  
Tax credit carryforward, amount 284.1  
Internal Revenue Service (IRS)    
Operating Loss Carryforwards [Line Items]    
Tax benefits related to NOLs 7.1  
State and Local Jurisdiction    
Operating Loss Carryforwards [Line Items]    
Deferred tax benefits 5.3 $ 6.3
Operating loss carryforwards of federal income tax benefit 5.0  
Evergy Kansas Central    
Operating Loss Carryforwards [Line Items]    
Tax credit carryforward, amount 237.9  
Evergy Metro    
Operating Loss Carryforwards [Line Items]    
Tax credit carryforward, amount 43.6  
Tax Year 2006 [Member]    
Operating Loss Carryforwards [Line Items]    
Deferred tax benefits $ 17.2