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Summary of Significant Accounting Policies (Related Party Transactions) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Charges for services provided	$ 9.1		$ 22.3
Net Prepaid/Payables to the Service Company	(2.0)		(2.0)
DP&L [Member]
Charges for services provided	7.7		19.1
Premiums paid for insurance services provided by MVIC	(0.7)	(0.7)	(1.4)	(1.4)
Expense recoveries for services provided to DPLER	1.1	1.4	1.1	2.5
Deposits received from DPLER	19.2		19.2		19.2
DPLER [Member]
Sales to related party	83.0	81.3	190.7	160.0
MC Squared [Member]
Sales to related party	27.0	26.8	58.0	52.4
Service Company [Member]
Net Prepaid/Payables to the Service Company	$ (2.0)		$ (2.0)

Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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