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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, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
DP&L [Member]
Premiums paid for insurance services provided by MVIC	$ (0.7)	$ (0.6)	$ (1.4)	$ (1.3)
Expense recoveries for services provided to DPLER	1.4	0.6	2.5	1.5
Deposits received from DPLER	19.2		19.2
DPLE and DPLER [Member]
Sales to related party	81.3	86.7	160.0	169.7
MC Squared [Member]
Sales to related party	$ 26.8	$ 0.3	$ 52.4	$ 0.3

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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