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Equity Compensation (Tables)
12 Months Ended
Dec. 31, 2011
Equity Compensation [Abstract]  
Equity compensation expense and associated income tax benefits
        
 
2011
2010
2009
Great Plains Energy
(millions)
Compensation expense
$5.2 $4.3 $6.3 
Income tax benefits
 1.9  1.0  1.6 
KCP&L
         
Compensation expense
 3.5  3.0  4.3 
Income tax benefits
 1.3  0.5  0.8 
           
Performance share activity
      
 
Performance
Grant Date
 
Shares
Fair Value*
Beginning balance
 431,784 $18.01 
Granted
 140,128  26.15 
Earned
 (68,258) 11.04 
Forfeited
 (61,612) 22.38 
Ending balance
 442,042  21.06 
*  weighted-average
Restricted stock activity
 
    
 
Nonvested
Grant Date
 
Restricted Stock
Fair Value*
Beginning balance
 406,657 $16.23 
Granted and issued
 182,385  19.03 
Vested
 (149,688) 17.29 
Forfeited
 (53,171) 17.25 
Ending balance
 386,183  17.06 
*  weighted-average
Stock option activity
      
   
Exercise
Stock Options
Shares
Price*
Beginning balance
 198,781 $32.51 
Forfeited or expired
 (189,428) 32.83 
Outstanding and exercisable at December 31, 2011
 9,353  25.91 
*  weighted-average
Director deferred share units activity
      
 
Share
Grant Date
 
Units
Fair Value*
Beginning balance
 39,063 $20.04 
Issued
 15,168  20.57 
Ending balance
 54,231  20.19 
*  weighted-average