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Consolidated Statements of Changes in Equity - Westar Energy, Inc Statement - USD ($)
$ in Millions
Total
Common stock
Retained earnings
Non-controlling interests
Westar Energy
Westar Energy
Common stock
Westar Energy
Retained earnings
Westar Energy
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 62.9   60.5 2.4 62.9   60.5 2.4
Issuance of stock for compensation and reinvested dividends (in shares)   138,828       138,828    
Issuance of stock for compensation and reinvested dividends (3.7) $ (3.7)     (3.7) $ (3.7)    
Dividends declared on common stock (57.7)   (57.7)   (57.7)   (57.7)  
Stock compensation expense 2.5 $ 2.5     2.5 $ 2.5    
Ending balance (in shares) at Mar. 31, 2018   142,233,103       142,233,103    
Ending balance at Mar. 31, 2018 3,864.4 $ 2,733.6 1,176.1 (45.3) 3,864.4 $ 2,733.6 1,176.1 (45.3)
Beginning balance (in shares) at Dec. 31, 2018   255,326,252       1    
Beginning 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 103.4   99.5 3.9 68.3   64.4 3.9
Issuance of stock for compensation and reinvested dividends (in shares)   60,594            
Issuance of stock for compensation and reinvested dividends (1.6) $ (1.6)            
Dividends declared on common stock (119.8)   (119.8)   (110.0)   (110.0)  
Stock compensation expense 5.4 $ 5.4            
Consolidation of noncontrolling interests 3.8     3.8 3.8     3.8
Distributions to shareholders of noncontrolling interests (1.4)     (1.4) (1.4)     (1.4)
Ending balance (in shares) at Mar. 31, 2019   244,838,786       1    
Ending balance at Mar. 31, 2019 $ 9,391.7 $ 8,110.4 $ 1,325.7 $ (31.2) $ 3,921.4 $ 2,737.6 $ 1,215.0 $ (31.2)