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Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2013
Accounting Policies [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table reconciles Great Plains Energy's basic and diluted EPS.
 
 
Three Months Ended
June 30
 
Year to Date
June 30
 
 
2013
 
2012
 
2013
 
2012
Income

(millions, except per share amounts)
Net income
 
$
63.6

 
$
58.1

 
$
89.6

 
$
48.8

Less: net loss attributable to noncontrolling interest
 
—

 
—

 
—

 
(0.2
)
Less: preferred stock dividend requirements
 
0.4

 
0.4

 
0.8

 
0.8

Earnings available for common shareholders
 
$
63.2

 
$
57.7

 
$
88.8

 
$
48.2

Common Shares Outstanding
 
 
 
 
 
 

 
 

Average number of common shares outstanding
 
153.5

 
139.6

 
153.4

 
137.7

Add: effect of dilutive securities
 
0.3

 
2.4

 
0.3

 
2.9

Diluted average number of common shares outstanding
 
153.8

 
142.0

 
153.7

 
140.6

Basic EPS
 
$
0.41

 
$
0.41

 
$
0.58

 
$
0.35

Diluted EPS
 
$
0.41

 
$
0.41

 
$
0.58

 
$
0.34
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
Anti-dilutive shares excluded from the computation of diluted EPS are detailed in the following table.
 
 
Three Months Ended
June 30
 
Year to Date
June 30
 
 
2013
 
2012
 
2013
 
2012
Performance shares
 
55,271

 
—

 
55,271

 
—

Restricted stock shares
 
—

 
10,617

 
21,652

 
10,617