Shareholder's Equity - USD ($) $ in Millions	Total	THE DAYTON POWER AND LIGHT COMPANY [Member]
Class of Stock [Line Items]
Common Stock, Shares Authorized	1,500	50,000,000
Par value common shares (in USD per share)	$ 0.01
Common Stock, Shares, Outstanding		41,172,173
Stockholders' Equity Note Disclosure	Shareholder's Deficit Capital Contributions from AES In DP&L's six-year 2017 ESP, the PUCO imposed restrictions on DPL making dividend payments to its parent company, AES, during the term of the ESP, as well as on making tax-sharing payments to AES during the term of the DMR. The PUCO also required 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. With the November 21, 2019 order from the PUCO that removed the DMR and the subsequent approval of DP&L's ESP 1 rate plan, these requirements were eliminated. See Note 3 – Regulatory Matters in Item 8. — Financial Statements and Supplementary Data of our Form 10-K for additional information on changes to DP&L's ESP and the removal of the DMR. For the six months ended June 30, 2019, DPL had a current tax benefit. Consequently, there was no conversion of current tax liabilities to AES capital contributions for the six months ended June 30, 2019. During the six months ended June 30, 2020, DPL received $150.0 million in a cash contribution from AES, which DPL then used to make a $150.0 million capital contribution to DP&L. The contribution at DPL represented an equity capital contribution of $98.0 million and a payment of $52.0 million against its tax receivable. The proceeds from the capital contribution at DP&L will primarily be used for funding needs to support DP&L's capital expenditure program, mainly new investments in and upgrades to DP&L’s transmission and distribution system.	Shareholder's Equity Capital Contribution and Returns of Capital During the six months ended June 30, 2020, DPL made a capital contribution of $150.0 million to DP&L. The proceeds will primarily be used for funding needs to support DP&L's capital expenditure program, mainly new investments in and upgrades to DP&L’s transmission and distribution system. Additionally, DP&L made returns of capital payments of $14.2 million to DPL. During the six months ended June 30, 2019, DP&L made returns of capital payments of $70.0 million to DPL.
Proceeds from Contributions from Parent	$ 98.0	$ 150.0
Cash Contribution from Parent Company	150.0
Income Taxes Paid, Net	$ (52.0)
Common Stock, Shares Authorized	1,500	50,000,000
Par value common shares (in USD per share)		$ 0.01

Shareholder's Equity - USD ($)
$ in Millions

Total

THE DAYTON POWER AND LIGHT COMPANY [Member]

Common Stock, Shares Authorized

1,500

50,000,000

Par value common shares (in USD per share)

$ 0.01

Common Stock, Shares, Outstanding

41,172,173

Stockholders' Equity Note Disclosure

Shareholder's Deficit

Capital Contributions from AES

In DP&L's six-year 2017 ESP, the PUCO imposed restrictions on DPL making dividend payments to its parent company, AES, during the term of the ESP, as well as on making tax-sharing payments to AES during the term of the DMR. The PUCO also required 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. With the November 21, 2019 order from the PUCO that removed the DMR and the subsequent approval of DP&L's ESP 1 rate plan, these requirements were eliminated. See Note 3 – Regulatory Matters in Item 8. — Financial Statements and Supplementary Data of our Form 10-K for additional information on changes to DP&L's ESP and the removal of the DMR.

For the six months ended June 30, 2019, DPL had a current tax benefit. Consequently, there was no conversion of current tax liabilities to AES capital contributions for the six months ended June 30, 2019.

During the six months ended June 30, 2020, DPL received $150.0 million in a cash contribution from AES, which DPL then used to make a $150.0 million capital contribution to DP&L. The contribution at DPL represented an equity capital contribution of $98.0 million and a payment of $52.0 million against its tax receivable. The proceeds from the capital contribution at DP&L will primarily be used for funding needs to support DP&L's capital expenditure program, mainly new investments in and upgrades to DP&L’s transmission and distribution system.

Shareholder's Equity

Capital Contribution and Returns of Capital

During the six months ended June 30, 2020, DPL made a capital contribution of $150.0 million to DP&L. The proceeds will primarily be used for funding needs to support DP&L's capital expenditure program, mainly new investments in and upgrades to DP&L’s transmission and distribution system. Additionally, DP&L made returns of capital payments of $14.2 million to DPL.

During the six months ended June 30, 2019, DP&L made returns of capital payments of $70.0 million to DPL.

Proceeds from Contributions from Parent

$ 98.0

$ 150.0

Cash Contribution from Parent Company

150.0

Income Taxes Paid, Net

$ (52.0)

Common Stock, Shares Authorized

1,500

50,000,000

Par value common shares (in USD per share)

$ 0.01