Shareholder's Equity (Details) - USD ($)
$ / shares in Units, $ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2020

Jun. 30, 2020

Sep. 30, 2019

Jun. 30, 2019

Mar. 31, 2019

Sep. 30, 2020

Sep. 30, 2019

Dec. 31, 2019

Class of Stock [Line Items]

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 nine months ended September 30, 2019, AES made a capital contribution of $2.7 million by converting the amount owed to it by DPL related to tax-sharing payments for current tax liabilities.

During the nine months ended September 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.

Non-cash capital contribution

$ 0.1

$ 98.0

$ 2.7

$ (1.5)

$ 1.5

$ 0.0

$ 2.7

Common Stock, Shares Authorized

1,500

1,500

1,500

1,500

1,500

Par value common shares (in USD per share)

$ 0.01

$ 0.01

Proceeds from Contributions from Parent

$ 98.0

$ 0.0

Cash Contribution from Parent Company

150.0

Income Taxes Paid, Net

$ (51.9)

$ 1.3

Other Additional Capital [Member]

Class of Stock [Line Items]

Non-cash capital contribution

$ 0.1

$ 2.7

^[1]

(1.5)

^[1]

$ 1.5

^[1]

Proceeds from Contributions from Parent

98.0

Subsidiaries [Member]

Class of Stock [Line Items]

Stockholders' Equity Note Disclosure

Shareholder's Equity

Capital Contribution and Returns of Capital

During the nine months ended September 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 declared return of capital payments of $42.7 million to DPL, of which $27.7 million was paid during the period.

During the nine months ended September 30, 2019, DP&L made returns of capital payments of $90.0 million to DPL.

Common Stock, Shares Authorized

50,000,000

50,000,000

50,000,000

50,000,000

50,000,000

Par value common shares (in USD per share)

$ 0.01

$ 0.01

$ 0.01

$ 0.01

Common Stock, Shares, Outstanding

41,172,173

41,172,173

41,172,173

Proceeds from Contributions from Parent

150.0

$ 150.0

$ 0.0

Dividends, Common Stock, Cash

$ (28.5)

(14.2)

$ (20.0)

(70.0)

Subsidiaries [Member] | Other Additional Capital [Member]

Class of Stock [Line Items]

Dividends, Common Stock, Cash

$ (28.5)

$ (14.2)

$ (20.0)

$ (70.0)

(27.7)

$ (90.0)

Dividends, Common Stock

$ (42.7)

[1] Represents the conversion of a tax sharing payable to AES to contributed capital, as DP&L's 2017 ESP restricted tax sharing payments to AES during the term of the ESP.