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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2017
Entity Information [Line Items]  
Schedule of Effective Income Tax Rates
The following table details the effective tax rates for the three months ended March 31, 2017 and 2016.
 
 
Three months ended
 
 
March 31,
 
 
2017
 
2016
DPL
 
37.9%
 
21.4%
THE DAYTON POWER AND LIGHT COMPANY [Member]  
Entity Information [Line Items]  
Schedule of Effective Income Tax Rates
The following table details the effective tax rates for the three months ended March 31, 2017 and 2016.
 
 
Three months ended
 
 
March 31,
 
 
2017
 
2016
DP&L
 
34.4%
 
26.9%