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SHAREHOLDERS' EQUITY - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 12 Months Ended
Apr. 30, 2021
Dec. 31, 2021
Dec. 31, 2023
Feb. 28, 2021
Line of Credit Facility [Line Items]        
Preferred stock, shares authorized (in shares)     12,000,000  
Stock to be Sold and Issued Under Securities Purchase Agreement, Shares       2,269,447
Stock to be Sold and Issued Under Securities Purchase Agreement, Value       $ 113.2
Warrant to be Issued Under Securities Purchase Agreement for Potential Shares, Maximum       3,950,000
Class of Warrant or Right, Exercise Price of Warrants or Rights       $ 64.70
Restriction on payment of dividends (at least)     35.00%  
Restricted net assets of subsidiaries     $ 6,300.0  
Issuance of stock, net of issuance costs $ 112.5 $ 112.5    
Stock issuance costs $ 0.7      
Evergy Kansas Central        
Line of Credit Facility [Line Items]        
Restriction on payment of dividends (at least)     40.00%  
Retained earnings restrictions     $ 316.0  
Evergy Metro        
Line of Credit Facility [Line Items]        
Restriction on payment of dividends (at least)     40.00%  
Retained earnings restrictions     $ 466.8