Generation Separation (Policies)

3 Months Ended

Mar. 31, 2018

Subsidiaries [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Discontinued Operations, Policy [Policy Text Block]

The PUCO authorized DP&L to maintain long-term debt of $750 million or 75% of its rate base, whichever is greater, until January 1, 2018, or to file an application to explain why it would not achieve those metrics. Accordingly, $750.0 million of debt and the pro rata interest expense associated with that debt were allocated to continuing operations. All remaining interest expense was included in the discontinued operations above. The interest expense included in discontinued operations was $0.2 million for the three months ended March 31, 2017.