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Segments and Related Information (Tables)
 3 Months Ended
Mar. 31, 2016
Segment Reporting [Abstract]  
Segment Financial Information [Table Text Block]
The following tables reflect summarized financial information concerning Great Plains Energy's reportable segment.
Three Months Ended March 31, 2016
Electric
Utility
 
Other
 
Eliminations
 
Great Plains
Energy
 
 
(millions)
Operating revenues
 
$
572.1

 
 
 
$
—

 
 
 
$
—

 
 
 
$
572.1

 
Depreciation and amortization
 
(85.2
)
 
 
 
—

 
 
 
—

 
 
 
(85.2
)
 
Interest (charges) income
 
(49.1
)
 
 
 
(10.1
)
 
 
 
8.0

 
 
 
(51.2
)
 
Income tax (expense) benefit
 
(13.1
)
 
 
 
1.4

 
 
 
—

 
 
 
(11.7
)
 
Net income (loss)
 
29.0

 
 
 
(2.6
)
 
 
 
—

 
 
 
26.4

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended March 31, 2015
Electric
Utility
 
Other
 
Eliminations
 
Great Plains
Energy
 
 
(millions)
Operating revenues
 
$
549.1

 
 
 
$
—

 
 
 
$
—

 
 
 
$
549.1

 
Depreciation and amortization
 
(79.8
)
 
 
 
—

 
 
 
—

 
 
 
(79.8
)
 
Interest (charges) income
 
(45.3
)
 
 
 
(10.0
)
 
 
 
8.0

 
 
 
(47.3
)
 
Income tax (expense) benefit
 
(7.9
)
 
 
 
1.4

 
 
 
—

 
 
 
(6.5
)
 
Net income (loss)
 
20.9

 
 
 
(2.0
)
 
 
 
—

 
 
 
18.9

 

 
Electric
Utility
 
Other
 
Eliminations
 
Great Plains
Energy
March 31, 2016
 
(millions)
 
Assets
 
$
11,090.6

 
 
 
$
48.3

 
 
 
$
(395.8
)
 
 
 
$
10,743.1

 
Capital expenditures (a)
 
133.6

 
 
 
—

 
 
 
—

 
 
 
133.6

 
December 31, 2015
 
 

 
 
 
 

 
 
 
 

 
 
 
 

 
Assets
 
$
11,045.5

 
 
 
$
(51.1
)
 
 
 
$
(255.8
)
 
 
 
$
10,738.6

 
Capital expenditures (a)
 
677.1

 
 
 
—

 
 
 
—

 
 
 
677.1