XML 171 R108.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Stock-Based Compensation (Schedule Of Restricted Stock Activity) (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Number of Shares      
Granted (in shares) 503,493    
Consumers Energy Company      
Number of Shares      
Granted (in shares) 478,535    
Restricted stock      
Number of Shares      
Granted (in shares) 488,594    
Vested (in shares) (468,308)    
Forfeited (in share) (46,949)    
Weighted-Average Grant Date Fair Value per Share      
Granted (in dollars per share) $ 43.57 $ 26.49 $ 28.61
Vested (in dollars per share) 31.09    
Forfeitured (in dollars per share) $ 45.81    
Restricted stock | Consumers Energy Company      
Number of Shares      
Granted (in shares) 464,485    
Vested (in shares) (447,214)    
Forfeited (in share) (40,139)    
Weighted-Average Grant Date Fair Value per Share      
Granted (in dollars per share) $ 43.57 26.51 28.67
Vested (in dollars per share) 31.11    
Forfeitured (in dollars per share) $ 45.69    
Restricted stock units      
Number of Shares      
Granted (in shares) 14,899    
Vested (in shares) (12,503)    
Forfeited (in share) 0    
Weighted-Average Grant Date Fair Value per Share      
Granted (in dollars per share) $ 50.35 41.77 41.98
Vested (in dollars per share) $ 41.59    
Restricted stock units | Consumers Energy Company      
Number of Shares      
Granted (in shares) 14,050    
Vested (in shares) (11,836)    
Forfeited (in share) 0    
Weighted-Average Grant Date Fair Value per Share      
Granted (in dollars per share) $ 51.15 $ 42.01 $ 41.97
Vested (in dollars per share) $ 42.35    
Restricted Stock and Restricted Stock Units      
Number of Shares      
Nonvested, at beginning of period (in shares) 1,211,229    
Nonvested, at end of period (in shares) 1,186,962 1,211,229  
Weighted-Average Grant Date Fair Value per Share      
Weighted-average grant date fair value per share, at beginning of period (in dollars per share) $ 39.70    
Weighted-average grant date fair value per share, at end of period (in dollars per share) $ 44.56 $ 39.70  
Restricted Stock and Restricted Stock Units | Consumers Energy Company      
Number of Shares      
Nonvested, at beginning of period (in shares) 1,158,836    
Nonvested, at end of period (in shares) 1,138,182 1,158,836  
Weighted-Average Grant Date Fair Value per Share      
Weighted-average grant date fair value per share, at beginning of period (in dollars per share) $ 39.71    
Weighted-average grant date fair value per share, at end of period (in dollars per share) $ 44.57 $ 39.71