Regulatory Matters	9 Months Ended
Regulatory Matters	Sep. 30, 2014
Regulatory Matters	3. Regulatory Assets DP&L’s regulatory asset for deferred storm costs represents costs incurred to repair the damage caused to DP&L’s distribution equipment by major storms in 2008, 2011 and 2012. Such costs are included in Regulatory assets, non-current on the accompanying Condensed Consolidated Balance Sheets and were $22.3 million and $25.6 million as of September 30, 2014 and December 31, 2013, respectively. DP&L filed an application with the PUCO in 2012 to recover these costs. The main issue in the case was the level of storm costs that should be recoverable. On April 14, 2014, DP&L reached an agreement in principle with the PUCO Staff whereby DP&L would recover storm costs of $22.3 million from all customers on a non-bypassable basis. As a result of these developments, we reduced the regulatory asset balance to $22.3 million as our best estimate of the amount that is probable of recovery. In accordance with FASC 980 “Regulated Operations”, the reduction was recognized as a current period expense, which is included in Operation and maintenance and the corresponding adjustment to carrying costs which is included in interest expense on the accompanying Condensed Consolidated Statements of Results of Operations. A stipulation was finalized and filed at the PUCO and a hearing took place the first week of June 2014. A decision is expected before the end of the year. In August 2014, the PUCO issued an order in a case relating to review of DP&L’s fuel cost recovery mechanism for the calendar year 2012. The order included the disallowance of an immaterial amount of fuel costs. The impact of the order issued was a reversal in the third quarter of a previously established $2.6 million reserve.
DP&L [Member]
Regulatory Matters	3. Regulatory Assets DP&L’s regulatory asset for deferred storm costs represents costs incurred to repair the damage caused to DP&L’s distribution equipment by major storms in 2008, 2011 and 2012. Such costs are included in Regulatory Assets, non-current on the accompanying Condensed Balance Sheets and were $22.3 million and $25.6 million as of March 31, 2014 and December 31, 2013, respectively. DP&L filed an application with the PUCO in 2012 to recover these costs. The main issue in the case was the level of storm costs that should be recoverable. On April 14, 2014, DP&L reached an agreement in principle with the PUCO Staff whereby DP&L would recover storm costs of $22.3 million from all customers on a non-bypassable basis. As a result of these developments, we reduced the regulatory asset balance to $22.3 million as our best estimate of the amount that is probable of recovery. In accordance with FASC 980 “Regulated Operations”, the reduction was recognized as a current period expense, which is included in Operation and maintenance and the corresponding adjustment to carrying costs which is included in interest expense on the accompanying Condensed Statements of Results of Operations. A stipulation was finalized and filed at the PUCO and a hearing took place the first week of June 2014. A decision is expected before the end of the year. In August 2014, the PUCO issued an order in a case relating to review of DP&L’s fuel cost recovery mechanism for the calendar year 2012. The order included the disallowance of an immaterial amount of fuel costs. The impact of the order issued was a reversal in the third quarter of a previously established $2.6 million reserve.