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Consolidated Statements of Changes in Equity - Evergy Kansas Central, Inc - USD ($)
$ in Millions
Total
Common Stock
Retained earnings
Non-controlling interests
Evergy Kansas Central
Evergy Kansas Central
Common Stock
Evergy Kansas Central
Retained earnings
Evergy Kansas Central
Non-controlling interests
Beginning balance (in shares) at Dec. 31, 2017   142,094,275       142,094,275    
Beginning balance at Dec. 31, 2017 $ 3,860.4 $ 2,734.8 $ 1,173.3 $ (47.7) $ 3,860.4 $ 2,734.8 $ 1,173.3 $ (47.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 546.0   535.8 10.2 349.1   338.9 10.2
Issuance of stock compensation and reinvested dividends, net of tax withholding (in shares)   533,273       516,990    
Issuance of stock compensation and reinvested dividends, net of tax withholding (16.7) $ (16.7)     (17.2) $ (17.2)    
Stock Canceled During Period Shares Net           (142,611,264)    
Stock Canceled During Period, Value         0.0      
Dividends declared on common stock (362.1)   (362.1)   (251.6)   (251.6)  
Stock compensation expense 29.9 29.9     19.9 $ 19.9    
Stockholders' Equity, Other (0.4) $ (0.4)     0.1 $ 0.1    
Ending balance (in shares) at Dec. 31, 2018   255,326,252       1    
Ending balance at Dec. 31, 2018 9,990.7 $ 8,685.2 1,346.0 (37.5) 3,960.7 $ 2,737.6 1,260.6 (37.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 685.6   669.9 15.7 359.1   343.4 15.7
Issuance of stock compensation and reinvested dividends, net of tax withholding (in shares)   111,849            
Issuance of stock compensation and reinvested dividends, net of tax withholding (2.4) $ (2.4)            
Dividends declared on common stock (462.5)   (462.5)   (110.0)   (110.0)  
Stock compensation expense 16.3 $ 16.3            
Consolidation of noncontrolling interests 3.8     3.8 3.8     3.8
Distributions to shareholders of noncontrolling interests (8.6)     (8.6) (8.6)     (8.6)
Ending balance (in shares) at Dec. 31, 2019   226,641,443       1    
Ending balance at Dec. 31, 2019 8,545.3 $ 7,070.4 1,551.5 (26.6) 4,205.0 $ 2,737.6 1,494.0 (26.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 630.0   618.3 11.7 235.8   224.1 11.7
Issuance of stock compensation and reinvested dividends, net of tax withholding (in shares)   195,227            
Issuance of stock compensation and reinvested dividends, net of tax withholding (5.9) $ (5.9)            
Dividends declared on common stock (465.0)   (465.0)   (160.0)   (160.0)  
Stock compensation expense 16.0 16.0            
Stockholders' Equity, Other (0.5) $ (0.5)            
Ending balance (in shares) at Dec. 31, 2020   226,836,670       1    
Ending balance at Dec. 31, 2020 $ 8,718.5 $ 7,080.0 $ 1,702.8 $ (14.9) $ 4,280.8 $ 2,737.6 $ 1,558.1 $ (14.9)