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SHAREHOLDERS' EQUITY - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
17 Months Ended
Dec. 31, 2019
Feb. 25, 2021
Dec. 31, 2020
Jul. 31, 2018
Line of Credit Facility [Line Items]        
Common stock, shares authorized (in shares) 600,000,000   600,000,000  
Preferred stock, shares authorized (in shares)     12,000,000  
Number of shares authorized to be repurchased (in shares)       60,000,000
Stock repurchased and retired during period under repurchase plan, value $ 2,671.0      
Stock repurchased and retired during period (in shares) 45,200,000      
Restriction on payment of dividends (at least)     35.00%  
Restricted net assets of subsidiaries     $ 5,700.0  
Subsequent Event        
Line of Credit Facility [Line Items]        
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    
Warrants and Rights Outstanding, Term   3 years    
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 64.70    
Cash Borrowings        
Line of Credit Facility [Line Items]        
Debt instrument, debt to capitalization ratio (no more than)     65.00%  
Evergy Kansas Central        
Line of Credit Facility [Line Items]        
Common stock, shares authorized (in shares) 1,000   1,000  
Restriction on payment of dividends (at least)     40.00%  
Evergy Kansas Central | Cash Borrowings        
Line of Credit Facility [Line Items]        
Debt instrument, debt to capitalization ratio (no more than)     65.00%  
Evergy Metro        
Line of Credit Facility [Line Items]        
Common stock, shares authorized (in shares) 1,000   1,000  
Restriction on payment of dividends (at least)     40.00%  
Retained earnings restrictions     $ 385.6  
Evergy Metro | Cash Borrowings        
Line of Credit Facility [Line Items]        
Debt instrument, debt to capitalization ratio (no more than)     65.00%  
Evergy Missouri West | Cash Borrowings        
Line of Credit Facility [Line Items]        
Debt instrument, debt to capitalization ratio (no more than)     65.00%