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RELATED PARTY TRANSACTIONS AND RELATIONSHIPS (Tables)
9 Months Ended
Sep. 30, 2011
Notes to Financial Statements [Abstract] 
Kansas City Power and Light Company's related party receivables and payables
    
 September 30December 31
  2011
2010
  (millions)
Net receivable from GMO
$
 45.7
  $
29.6
 
Net receivable from Great Plains Energy
 
       14.0
   
       13.3
 
Receivable from MPS Merchant
 
         8.6
   
         0.3