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Shareholder's Equity	6 Months Ended
Shareholder's Equity	Jun. 30, 2019
Class of Stock [Line Items]
Shareholder's Equity	Shareholder's Equity Capital Contributions from AES DP&L's approved six-year 2017 ESP restricts DPL from making dividend payments to its parent company, AES, during the term of the ESP, as well as from making tax-sharing payments to AES during the term of the DMR. The 2017 ESP also requires that existing tax payments owed by DPL to AES, and similar tax payments that accrue during the term of the DMR, be converted into equity investments in DPL. For the six months ended June 30, 2018, AES made capital contributions of $26.7 million by converting the amount owed to it by DPL related to tax-sharing payments for current tax liabilities. Through the six months ended June 30, 2019, DPL has a current tax benefit. Consequently, there was no conversion of current tax liabilities in 2019.
THE DAYTON POWER AND LIGHT COMPANY [Member]
Class of Stock [Line Items]
Shareholder's Equity	Shareholder's Equity Capital Contribution and Returns of Capital During the six months ended June 30, 2019, DP&L made returns of capital payments of $70.0 million to DPL. During the six months ended June 30, 2018, DP&L received an $80.0 million capital contribution from its parent, DPL. In addition, DP&L made returns of capital payments of $23.8 million to DPL.