XML 44 R32.htm IDEA: XBRL DOCUMENT v2.4.1.9
Summary of Significant Accounting Policies (Related Party Transactions) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Charges for services provided $ 9.8us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty $ 10.4us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty  
Net Prepaid/Payables to the Service Company 3.0us-gaap_AccountsPayableRelatedPartiesCurrent   (4.7)us-gaap_AccountsPayableRelatedPartiesCurrent
DP&L [Member]      
Charges for services provided 8.4us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ dei_LegalEntityAxis
= dpl_DpLMember
10.4us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ dei_LegalEntityAxis
= dpl_DpLMember
 
Premiums paid for insurance services provided by MVIC (0.7)us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
/ dei_LegalEntityAxis
= dpl_DpLMember
(0.8)us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
/ dei_LegalEntityAxis
= dpl_DpLMember
 
Expense recoveries for services provided to DPLER 0.8dpl_RelatedPartyTransactionExpenseRecoveries
/ dei_LegalEntityAxis
= dpl_DpLMember
   
Deposits received from DPLER 2.4dpl_DepositsReceivedFromDpler
/ dei_LegalEntityAxis
= dpl_DpLMember
  20.1dpl_DepositsReceivedFromDpler
/ dei_LegalEntityAxis
= dpl_DpLMember
DPLER [Member]      
Sales to related party 110.7us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= dpl_DplerMember
139.5us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= dpl_DplerMember
 
Service Company [Member]      
Net Prepaid/Payables to the Service Company $ 3.0us-gaap_AccountsPayableRelatedPartiesCurrent
/ dei_LegalEntityAxis
= dpl_ServiceCompanyMember
  $ (4.7)us-gaap_AccountsPayableRelatedPartiesCurrent
/ dei_LegalEntityAxis
= dpl_ServiceCompanyMember