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Goodwill and Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2011
Goodwill and Intangible Assets [Abstract]  
Intangible Assets included in Electric Utility Plant
           
 
December 31, 2011
 
December 31, 2010
 
Gross Carrying
Accumulated
 
Gross Carrying
Accumulated
 
Amount
Amortization
 
Amount
Amortization
KCP&L(millions)
Computer software
$171.7 $(129.9) $168.2 $(118.0)
Asset improvements
 11.7  (0.6)  5.8  - 
               
Great Plains Energy
             
Computer software
$202.5 $(143.5) $201.1 $(137.3)
Asset improvements
 27.0  (3.7)  27.9  (4.4)
               
Amortization expense
      
 
2011
2010
 
(millions)
Great Plains Energy
$13.5 $13.1 
KCP&L
 12.6  12.2 
        
Schedule of future amortization expense for intangible assets
            
 
2012
2013
2014
2015
2016
 
(millions)
Great Plains Energy
$13.9 $11.2 $8.1 $6.0 $4.7 
KCP&L
 11.0  8.3  5.3  3.4  2.1