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Segments and Related Information (Tables)
 6 Months Ended
Jun. 30, 2017
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 June 30, 2017
Electric
Utility
 
Other
 
Eliminations
 
Great Plains
Energy
 
 
(millions)
Operating revenues
 
$
682.6

 
 
 
$
—

 
 
 
$
—

 
 
 
$
682.6

 
Depreciation and amortization
 
(94.7
)
 
 
 
—

 
 
 
—

 
 
 
(94.7
)
 
Interest (charges) income
 
(50.1
)
 
 
 
(103.2
)
 
 
 
8.0

 
 
 
(145.3
)
 
Income tax (expense) benefit
 
(39.8
)
 
 
 
49.1

 
 
 
—

 
 
 
9.3

 
Net income (loss)
 
68.4

 
 
 
(75.4
)
 
 
 
—

 
 
 
(7.0
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Year to Date June 30, 2017
Electric
Utility
 
Other
 
Eliminations
 
Great Plains
Energy
 
 
(millions)
Operating revenues
 
$
1,253.3

 
 
 
$
—

 
 
 
$
—

 
 
 
$
1,253.3

 
Depreciation and amortization
 
(185.0
)
 
 
 
—

 
 
 
—

 
 
 
(185.0
)
 
Interest (charges) income
 
(100.2
)
 
 
 
(127.7
)
 
 
 
16.0

 
 
 
(211.9
)
 
Income tax (expense) benefit
 
(49.9
)
 
 
 
65.0

 
 
 
—

 
 
 
15.1

 
Net income (loss)
 
84.5

 
 
 
(101.1
)
 
 
 
—

 
 
 
(16.6
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended June 30, 2016
Electric
Utility
 
Other
 
Eliminations
 
Great Plains
Energy
 
 
(millions)
Operating revenues
 
$
670.8

 
 
 
$
—

 
 
 
$
—

 
 
 
$
670.8

 
Depreciation and amortization
 
(85.3
)
 
 
 
—

 
 
 
—

 
 
 
(85.3
)
 
Interest (charges) income
 
(49.0
)
 
 
 
(91.9
)
 
 
 
8.0

 
 
 
(132.9
)
 
Income tax (expense) benefit
 
(51.2
)
 
 
 
34.1

 
 
 
—

 
 
 
(17.1
)
 
Net income (loss)
 
88.3

 
 
 
(56.3
)
 
 
 
—

 
 
 
32.0

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Year to Date June 30, 2016
Electric
Utility
 
Other
 
Eliminations
 
Great Plains
Energy
 
 
(millions)
Operating revenues
 
$
1,242.9

 
 
 
$
—

 
 
 
$
—

 
 
 
$
1,242.9

 
Depreciation and amortization
 
(170.5
)
 
 
 
—

 
 
 
—

 
 
 
(170.5
)
 
Interest (charges) income
 
(98.1
)
 
 
 
(102.0
)
 
 
 
16.0

 
 
 
(184.1
)
 
Income tax (expense) benefit
 
(64.3
)
 
 
 
35.5

 
 
 
—

 
 
 
(28.8
)
 
Net income (loss)
 
117.3

 
 
 
(58.9
)
 
 
 
—

 
 
 
58.4

 
 
Electric
Utility
 
Other
 
Eliminations
 
Great Plains
Energy
June 30, 2017
 
(millions)
 
Assets
 
$
11,531.1

 
 
 
$
6,674.7

 
 
 
$
(399.4
)
 
 
 
$
17,806.4

 
Capital expenditures (a)
 
247.0

 
 
 
—

 
 
 
—

 
 
 
247.0

 
December 31, 2016
 
 

 
 
 
 

 
 
 
 

 
 
 
 

 
Assets
 
$
11,444.2

 
 
 
$
2,461.3

 
 
 
$
(335.5
)
 
 
 
$
13,570.0

 
Capital expenditures (a)
 
609.4

 
 
 
—

 
 
 
—

 
 
 
609.4