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Debt Obligations (Long-term Debt) (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Aug. 03, 2015
Jul. 31, 2015
Jul. 01, 2015
Debt Instrument [Line Items]          
Unamortized debt discount / premiums, net $ (0.6) $ (0.7)      
Total long-term debt at subsidary 314.5 874.7      
Total long-term debt 1,564.5 2,139.6      
THE DAYTON POWER AND LIGHT COMPANY [Member]          
Debt Instrument [Line Items]          
Unamortized debt discount / premiums, net (3.5) (2.8)      
Unamortized debt discount 0.0 (0.5)      
Total long-term debt $ 318.0 877.0      
First Mortgage Bonds Maturing in September 2016 - 1.875% [Member]          
Debt Instrument [Line Items]          
Long-term debt, gross   445.0      
Debt instrument maturity year Sep. 01, 2016        
Debt instrument interest percentage 1.875%        
First Mortgage Bonds Maturing in September 2016 - 1.875% [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]          
Debt Instrument [Line Items]          
Long-term debt, gross $ 0.0 445.0      
Pollution Control Series Maturing in January 2028 - 4.70% [Member]          
Debt Instrument [Line Items]          
Long-term debt, gross   35.3      
Debt instrument maturity year Jan. 01, 2028        
Debt instrument interest percentage 4.70%        
Pollution Control Series Maturing in January 2028 - 4.70% [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]          
Debt Instrument [Line Items]          
Long-term debt, gross $ 0.0 35.3      
Debt instrument interest percentage         4.70%
Pollution Control Series Maturing in January 2034 - 4.80% [Member]          
Debt Instrument [Line Items]          
Long-term debt, gross   179.1      
Debt instrument maturity year Jan. 01, 2034        
Debt instrument interest percentage 4.80%        
Pollution Control Series Maturing in January 2034 - 4.80% [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]          
Debt Instrument [Line Items]          
Long-term debt, gross $ 0.0 179.1      
Debt instrument interest percentage     4.80%   4.80%
Pollution Control Series Maturing in September 2036 - 4.80% [Member]          
Debt Instrument [Line Items]          
Long-term debt, gross $ 100.0 100.0      
Debt instrument maturity year Sep. 01, 2036        
Debt instrument interest percentage 4.80%        
Pollution Control Series Maturing in September 2036 - 4.80% [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]          
Debt Instrument [Line Items]          
Long-term debt, gross $ 100.0 100.0      
Pollution control series maturing in November 2040 - rates: 0.02% - 0.12% and 0.04% - 0.15% [Member]          
Debt Instrument [Line Items]          
Long-term debt, gross   $ 100.0      
Debt instrument maturity year Nov. 01, 2040        
Debt instrument interest percentage minimum 0.02% 0.04%      
Debt instrument interest percentage maximum 0.12% 0.15%      
Pollution control series maturing in November 2040 - rates: 0.02% - 0.12% and 0.04% - 0.15% [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]          
Debt Instrument [Line Items]          
Long-term debt, gross $ 0.0 $ 100.0      
Pollution Control Series Maturing in August 2020 - 1.13% - 1.14% [Member]          
Debt Instrument [Line Items]          
Debt instrument maturity year Aug. 01, 2020        
Debt instrument interest percentage minimum 1.13%        
Debt instrument interest percentage maximum 1.14%        
Pollution Control Series Maturing in August 2020 - 1.13% - 1.14% [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]          
Debt Instrument [Line Items]          
Long-term debt, gross $ 200.0        
U.S. Government note maturing in February 2061 - 4.20% [Member]          
Debt Instrument [Line Items]          
Long-term debt, gross $ 18.0 18.1      
Debt instrument maturity year Feb. 01, 2061        
Debt instrument interest percentage 4.20%        
U.S. Government note maturing in February 2061 - 4.20% [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]          
Debt Instrument [Line Items]          
Long-term debt, gross $ 18.0 18.1      
Bank term loan due in July 2020 - rates from: 2.44% - 2.45% [Member]          
Debt Instrument [Line Items]          
Long-term debt, gross $ 125.0     $ 125.0  
Debt instrument maturity year Jul. 31, 2020        
Debt instrument interest percentage minimum 2.44%        
Debt instrument interest percentage maximum 2.45%        
Bank term loan due in May 2018 - rates from: 2.41% - 2.44% and 2.42% - 2.45% [Member]          
Debt Instrument [Line Items]          
Long-term debt, gross   $ 140.0   $ 160.0  
Debt instrument maturity year May 01, 2018        
Debt instrument interest percentage minimum 2.41% 2.42%      
Debt instrument interest percentage maximum 2.44% 2.45%      
Senior unsecured due in October 2016 - 6.5% [Member]          
Debt Instrument [Line Items]          
Long-term debt, gross $ 130.0 $ 130.0      
Debt instrument maturity year Oct. 01, 2016        
Debt instrument interest percentage 6.50%        
Senior unsecured due in October 2019 - 6.75% [Member]          
Debt Instrument [Line Items]          
Long-term debt, gross $ 200.0 200.0      
Debt instrument maturity year Oct. 01, 2019        
Debt instrument interest percentage 6.75%        
Senior unsecured due in October 2021 - 7.25% [Member]          
Debt Instrument [Line Items]          
Long-term debt, gross $ 780.0 780.0      
Debt instrument maturity year Oct. 01, 2021        
Debt instrument interest percentage 7.25%        
Note to DPL Capital Trust II Maturing in September 2031 - 8.125% [Member]          
Debt Instrument [Line Items]          
Long-term debt, gross $ 15.6 $ 15.6      
Debt instrument maturity year Sep. 01, 2031        
Debt instrument interest percentage 8.125%