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SHAREHOLDERS' EQUITY - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended 17 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Jul. 31, 2018
Line of Credit Facility [Line Items]        
Common stock, shares authorized (in shares) 600,000,000 600,000,000 600,000,000  
Preferred stock, shares authorized (in shares) 12,000,000 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 $ 1,628.7 $ 2,671.0    
Stock repurchased and retired during period (in shares) 28,800,000 45,200,000    
Restriction on payment of dividends (at least) 35.00% 35.00%    
Restricted net assets of subsidiaries $ 5,000.0 $ 5,000.0    
Cash Borrowings        
Line of Credit Facility [Line Items]        
Debt instrument, debt to capitalization ratio (no more than) 65.00% 65.00%    
Evergy Kansas Central        
Line of Credit Facility [Line Items]        
Common stock, shares authorized (in shares) 1,000 1,000 1,000  
Restriction on payment of dividends (at least) 40.00% 40.00%    
Evergy Kansas Central | Cash Borrowings        
Line of Credit Facility [Line Items]        
Debt instrument, debt to capitalization ratio (no more than) 65.00% 65.00%    
Evergy Metro        
Line of Credit Facility [Line Items]        
Common stock, shares authorized (in shares) 1,000 1,000 1,000  
Restriction on payment of dividends (at least) 40.00% 40.00%    
Retained earnings restrictions $ 152.0 $ 152.0    
Evergy Metro | Cash Borrowings        
Line of Credit Facility [Line Items]        
Debt instrument, debt to capitalization ratio (no more than) 65.00% 65.00%    
Evergy Missouri West Inc | Cash Borrowings        
Line of Credit Facility [Line Items]        
Debt instrument, debt to capitalization ratio (no more than) 65.00% 65.00%