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Equity Compensation (Tables)
12 Months Ended
Dec. 31, 2015
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Equity compensation expense and associated income tax benefits
 
 
2015
 
2014
 
2013
Great Plains Energy
 
(millions)
Equity compensation expense
 
$
4.0

 
$
9.9

 
$
5.6

Income tax benefit
 
1.4

 
3.6

 
1.9

KCP&L
 
 

 
 

 
 

Equity compensation expense
 
$
2.6

 
$
6.9

 
$
4.0

Income tax benefit
 
0.9

 
2.4

 
1.3

Performance share activity
 
Performance
Shares
 
Grant Date
Fair Value*
Beginning balance January 1, 2015
 
534,016

 
 
 
$
25.11

 
Granted
 
232,838

 
 
 
24.03

 
Earned
 
(25,844
)
 
 
 
19.48

 
Forfeited
 
(54,485
)
 
 
 
25.68

 
Performance adjustment
 
(77,515
)
 
 
 
19.48

 
Ending balance December 31, 2015
 
609,010

 
 
 
25.60

 
Restricted stock activity
 
Nonvested
Restricted Stock
 
Grant Date
Fair Value*
Beginning balance January 1, 2015
 
267,390

 
 
 
$
22.31

 
Granted and issued
 
92,780

 
 
 
25.89

 
Vested
 
(110,496
)
 
 
 
19.71

 
Forfeited
 
(18,166
)
 
 
 
24.81

 
  Ending balance December 31, 2015
 
231,508

 
 
 
24.78

 
Director Deferred Share Units
 
 
Share Units
 
Grant Date Fair Value*
Beginning balance January 1, 2015
 
 
110,741

 
 
 
$
21.98

 
Issued
 
 
24,576

 
 
 
26.15

 
Converted
 
 
(19,902
)
 
 
 
21.50

 
Ending balance December 31, 2015
 
 
115,415

 
 
 
22.95