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Overview and Summary of Significant Accounting Policies (Tables) (DP&L [Member])
6 Months Ended
Jun. 30, 2012
DP&L [Member]
 
Related Party Transactions
  Three Months Ended
June 30,
Six Months Ended
June 30,
$ in millions 2012 2011 2012 2011
 
DP&L Revenues:                        
Sales to DPLER (a) $ 86.7   $ 81.0   $ 169.7   $ 156.1  
Sales to MC Squared $ 0.3   $ -   $ 0.3   $ -  
 
DP&L Operation & Maintenance Expenses:                        
Premiums paid for insurance services provided by MVIC (b)   (0.6 )   (0.8 )   (1.3 )   (1.6 )
Expense recoveries for services provided to DPLER (c)   0.6     0.8     1.5     1.7