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Debt Obligations (Current portion - Long-term Debt) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 01, 2011
Obligation for capital lease   0.1us-gaap_CapitalLeaseObligationsCurrent    
Current portion - long-term debt 20.1us-gaap_LongTermDebtCurrent 10.2us-gaap_LongTermDebtCurrent    
DP&L [Member]        
Obligation for capital lease   0.1us-gaap_CapitalLeaseObligationsCurrent
/ dei_LegalEntityAxis
= dpl_DpLMember		    
Current portion - long-term debt 0.1us-gaap_LongTermDebtCurrent
/ dei_LegalEntityAxis
= dpl_DpLMember		 0.2us-gaap_LongTermDebtCurrent
/ dei_LegalEntityAxis
= dpl_DpLMember		    
Pollution control series maturing in November 2040 - variable rates: 0.04% - 0.26% and 0.06% - 0.32% [Member]        
Debt instrument maturity year Nov. 01, 2040      
Debt instrument interest percentage minimum 0.04%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= dpl_ZeroPointTwoThreeToZeroPointTwoNineAndZeroPointOneSixToZeroPointThreeSixPercentageOfPollutionControlSeriesMaturingInNovemberTwoThousandFortyMember		 0.04%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= dpl_ZeroPointTwoThreeToZeroPointTwoNineAndZeroPointOneSixToZeroPointThreeSixPercentageOfPollutionControlSeriesMaturingInNovemberTwoThousandFortyMember		    
Debt instrument interest percentage maximum 0.15%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_DebtInstrumentAxis
= dpl_ZeroPointTwoThreeToZeroPointTwoNineAndZeroPointOneSixToZeroPointThreeSixPercentageOfPollutionControlSeriesMaturingInNovemberTwoThousandFortyMember		   0.26%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_DebtInstrumentAxis
= dpl_ZeroPointTwoThreeToZeroPointTwoNineAndZeroPointOneSixToZeroPointThreeSixPercentageOfPollutionControlSeriesMaturingInNovemberTwoThousandFortyMember		  
Pollution control series maturing in November 2040 - variable rates: 0.04% - 0.26% and 0.06% - 0.32% [Member] | DP&L [Member]        
Debt instrument maturity year Nov. 01, 2040      
Debt instrument interest percentage minimum 0.04%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= dpl_ZeroPointTwoThreeToZeroPointTwoNineAndZeroPointOneSixToZeroPointThreeSixPercentageOfPollutionControlSeriesMaturingInNovemberTwoThousandFortyMember
/ dei_LegalEntityAxis
= dpl_DpLMember		 0.04%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= dpl_ZeroPointTwoThreeToZeroPointTwoNineAndZeroPointOneSixToZeroPointThreeSixPercentageOfPollutionControlSeriesMaturingInNovemberTwoThousandFortyMember
/ dei_LegalEntityAxis
= dpl_DpLMember		    
Debt instrument interest percentage maximum 0.15%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_DebtInstrumentAxis
= dpl_ZeroPointTwoThreeToZeroPointTwoNineAndZeroPointOneSixToZeroPointThreeSixPercentageOfPollutionControlSeriesMaturingInNovemberTwoThousandFortyMember
/ dei_LegalEntityAxis
= dpl_DpLMember		   0.26%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_DebtInstrumentAxis
= dpl_ZeroPointTwoThreeToZeroPointTwoNineAndZeroPointOneSixToZeroPointThreeSixPercentageOfPollutionControlSeriesMaturingInNovemberTwoThousandFortyMember
/ dei_LegalEntityAxis
= dpl_DpLMember		  
U.S. Government note maturing in February 2061 - 4.20% [Member]        
Debt instrument maturity year Feb. 01, 2061      
Debt instrument interest percentage 4.20%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_FourPointTwoZeroPercentageOfUSGovernmentNoteMaturingInFebruaryTwoThousandSixtyOneMember		     4.20%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_FourPointTwoZeroPercentageOfUSGovernmentNoteMaturingInFebruaryTwoThousandSixtyOneMember
U.S. Government note maturing in February 2061 - 4.20%, current 0.1us-gaap_SecuredDebtCurrent
/ us-gaap_DebtInstrumentAxis
= dpl_FourPointTwoZeroPercentageOfUSGovernmentNoteMaturingInFebruaryTwoThousandSixtyOneMember		 0.1us-gaap_SecuredDebtCurrent
/ us-gaap_DebtInstrumentAxis
= dpl_FourPointTwoZeroPercentageOfUSGovernmentNoteMaturingInFebruaryTwoThousandSixtyOneMember		    
U.S. Government note maturing in February 2061 - 4.20% [Member] | DP&L [Member]        
Debt instrument maturity year Feb. 01, 2061      
Debt instrument interest percentage 4.20%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_FourPointTwoZeroPercentageOfUSGovernmentNoteMaturingInFebruaryTwoThousandSixtyOneMember
/ dei_LegalEntityAxis
= dpl_DpLMember		     4.20%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_FourPointTwoZeroPercentageOfUSGovernmentNoteMaturingInFebruaryTwoThousandSixtyOneMember
/ dei_LegalEntityAxis
= dpl_DpLMember
Debt instrument interest percentage minimum 4.20%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= dpl_FourPointTwoZeroPercentageOfUSGovernmentNoteMaturingInFebruaryTwoThousandSixtyOneMember
/ dei_LegalEntityAxis
= dpl_DpLMember		      
U.S. Government note maturing in February 2061 - 4.20%, current 0.1us-gaap_SecuredDebtCurrent
/ us-gaap_DebtInstrumentAxis
= dpl_FourPointTwoZeroPercentageOfUSGovernmentNoteMaturingInFebruaryTwoThousandSixtyOneMember
/ dei_LegalEntityAxis
= dpl_DpLMember		 0.1us-gaap_SecuredDebtCurrent
/ us-gaap_DebtInstrumentAxis
= dpl_FourPointTwoZeroPercentageOfUSGovernmentNoteMaturingInFebruaryTwoThousandSixtyOneMember
/ dei_LegalEntityAxis
= dpl_DpLMember		    
Bank Term Loan maturing in May 2018 [Member]        
Current portion - long-term debt 20.0us-gaap_LongTermDebtCurrent
/ us-gaap_DebtInstrumentAxis
= dpl_BankTermLoanMaturingInMay2018Member		 10.0us-gaap_LongTermDebtCurrent
/ us-gaap_DebtInstrumentAxis
= dpl_BankTermLoanMaturingInMay2018Member		    
Debt instrument maturity year May 01, 2018      
Debt instrument interest percentage 2.41%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_BankTermLoanMaturingInMay2018Member		      
Debt instrument interest percentage minimum 2.41%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= dpl_BankTermLoanMaturingInMay2018Member		 2.42%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= dpl_BankTermLoanMaturingInMay2018Member		    
Debt instrument interest percentage maximum 2.42%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_DebtInstrumentAxis
= dpl_BankTermLoanMaturingInMay2018Member		   2.45%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_DebtInstrumentAxis
= dpl_BankTermLoanMaturingInMay2018Member