Equity (Details) - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2024

Jun. 30, 2024

Mar. 31, 2024

Sep. 30, 2023

Jun. 30, 2023

Mar. 31, 2023

Sep. 30, 2024

Sep. 30, 2023

Stockholders' Equity Note Disclosure

During the nine months ended September 30, 2024, DPL received $200.0 million in equity contributions from AES. DPL then made the same investment in AES Ohio.

Cash Contribution from Parent Company

$ 200.0

$ 260.0

Proceeds from Contributions from Parent

$ 70.0

$ 130.0

$ 112.0

$ 200.0

239.0

Non-cash capital contribution

0.1

$ 127.0

Payment against tax receivable balance from Parent

21.0

Stockholders' Equity, Other

0.1

Other Additional Capital [Member]

Proceeds from Contributions from Parent

70.0

130.0

127.0

112.0

Stockholders' Equity, Other

0.1

0.1

Subsidiaries [Member]

Stockholders' Equity Note Disclosure

SHAREHOLDER'S EQUITY

During the nine months ended September 30, 2024, DPL made equity contributions of $200.0 million to AES Ohio.

During the nine months ended September 30, 2023, DPL made equity contributions of $260.0 million to AES Ohio.

The proceeds from these equity contributions allow AES Ohio to seek to improve its infrastructure and modernize its grid while maintaining liquidity.

Proceeds from Contributions from Parent

$ 70.0

$ 130.0

135.0

125.0

$ 200.0

$ 260.0

Stockholders' Equity, Other

$ (0.1)

(0.1)

0.1

$ (0.1)

Subsidiaries [Member] | Other Additional Capital [Member]

Proceeds from Contributions from Parent

135.0

125.0

Stockholders' Equity, Other

$ (0.1)

$ 0.0

$ 0.1

$ 0.0