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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2017
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
 September 30
 
Year to Date
September 30
 
2017
 
2016
 
2017
 
2016
Income (loss)
(millions, except per share amounts)
Net income (loss)
$
10.5

 
$
133.6

 
$
(6.1
)
 
$
192.0

Less: preferred stock dividend requirements and redemption premium
7.1

 
0.9

 
37.3

 
1.7

Earnings (loss) available for common shareholders
$
3.4

 
$
132.7

 
$
(43.4
)
 
$
190.3

Common Shares Outstanding
 
 
 

 
 

 
 

Average number of common shares outstanding
215.6

 
154.6

 
215.5

 
154.5

Add: effect of dilutive securities
0.1

 
0.3

 
—

 
0.4

Diluted average number of common shares outstanding
215.7

 
154.9

 
215.5

 
154.9

Basic and diluted EPS
$
0.02

 
$
0.86

 
$
(0.20
)
 
$
1.23