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Segments and Related Information
 6 Months Ended
Jun. 30, 2013
Segment Reporting [Abstract]  
Segments and Related Information
16. SEGMENTS AND RELATED INFORMATION
Great Plains Energy has one reportable segment based on its method of internal reporting, which segregates reportable segments based on products and services, management responsibility and regulation.  The one reportable business segment is electric utility, consisting of KCP&L, GMO's regulated utility operations and GMO Receivables Company.  Other includes GMO activity other than its regulated utility operations and unallocated corporate charges.  The summary of significant accounting policies applies to the reportable segment.  Segment performance is evaluated based on net income attributable to Great Plains Energy.
The following tables reflect summarized financial information concerning Great Plains Energy's reportable segment.
Three Months Ended
June 30, 2013
Electric
Utility
 
Other
 
Eliminations
 
Great Plains
Energy
 
(millions)
Operating revenues
 
$
600.3

 
 
 
$
—

 
 
 
$
—

 
 
 
$
600.3

 
Depreciation and amortization
 
(72.6
)
 
 
 
—

 
 
 
—

 
 
 
(72.6
)
 
Interest (charges) income
 
(47.4
)
 
 
 
(14.6
)
 
 
 
12.6

 
 
 
(49.4
)
 
Income tax (expense) benefit
 
(33.9
)
 
 
 
1.2

 
 
 
—

 
 
 
(32.7
)
 
Net income (loss) attributable to Great Plains Energy
 
65.5

 
 
 
(1.9
)
 
 
 
—

 
 
 
63.6

 
Year to Date
June 30, 2013
Electric
Utility
 
Other
 
Eliminations
 
Great Plains
Energy
 
(millions)
Operating revenues
 
$
1,142.5

 
 
 
$
—

 
 
 
$
—

 
 
 
$
1,142.5

 
Depreciation and amortization
 
(142.8
)
 
 
 
—

 
 
 
—

 
 
 
(142.8
)
 
Interest (charges) income
 
(95.2
)
 
 
 
(29.1
)
 
 
 
25.2

 
 
 
(99.1
)
 
Income tax (expense) benefit
 
(46.5
)
 
 
 
2.3

 
 
 
—

 
 
 
(44.2
)
 
Net income (loss) attributable to Great Plains Energy
 
93.1

 
 
 
(3.5
)
 
 
 
—

 
 
 
89.6

 
Three Months Ended
June 30, 2012
Electric
Utility
 
Other
 
Eliminations
 
Great Plains
Energy
 
(millions)
Operating revenues
 
$
603.6

 
 
 
$
—

 
 
 
$
—

 
 
 
$
603.6

 
Depreciation and amortization
 
(67.9
)
 
 
 
—

 
 
 
—

 
 
 
(67.9
)
 
Interest (charges) income
 
(50.4
)
 
 
 
(15.1
)
 
 
 
9.7

 
 
 
(55.8
)
 
Income tax (expense) benefit
 
(35.9
)
 
 
 
4.1

 
 
 
—

 
 
 
(31.8
)
 
Net income (loss) attributable to Great Plains Energy
 
63.8

 
 
 
(5.7
)
 
 
 
—

 
 
 
58.1

 
Year to Date
June 30, 2012
Electric
Utility
 
Other
 
Eliminations
 
Great Plains
Energy
 
(millions)
Operating revenues
 
$
1,083.3

 
 
 
$
—

 
 
 
$
—

 
 
 
$
1,083.3

 
Depreciation and amortization
 
(135.3
)
 
 
 
—

 
 
 
—

 
 
 
(135.3
)
 
Interest (charges) income
 
(101.1
)
 
 
 
(40.2
)
 
 
 
18.6

 
 
 
(122.7
)
 
Income tax (expense) benefit
 
(34.1
)
 
 
 
11.8

 
 
 
—

 
 
 
(22.3
)
 
Net income (loss) attributable to Great Plains Energy
 
68.3

 
 
 
(19.3
)
 
 
 
—

 
 
 
49.0

 
 
Electric
Utility
 
Other
 
Eliminations
 
Great Plains
Energy
June 30, 2013
 
(millions)
 
Assets
 
$
10,124.6

 
 
 
$
63.9

 
 
 
$
(424.5
)
 
 
 
$
9,764.0

 
Capital expenditures(a)
 
339.8

 
 
 
—

 
 
 
—

 
 
 
339.8

 
December 31, 2012
 
 

 
 
 
 

 
 
 
 

 
 
 
 

 
Assets
 
$
9,910.6

 
 
 
$
122.4

 
 
 
$
(385.7
)
 
 
 
$
9,647.3

 
Capital expenditures(a)
 
610.2

 
 
 
—

 
 
 
—

 
 
 
610.2

 

(a) 
Capital expenditures reflect year to date amounts for the periods presented.