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Debt (Tables)
 12 Months Ended
Dec. 31, 2023
Debt Instrument [Line Items]  
Long-term Debt
$ in millionsInterest RateMaturityDecember 31, 2023December 31, 2022
AES Ohio debt
First Mortgage Bonds3.95%2049$425.0 $425.0 
First Mortgage Bonds3.20%2040140.0 140.0 
First Mortgage Bonds5.70%2033107.5 — 
First Mortgage Bonds5.19%2033100.0 — 
First Mortgage Bonds5.49%202892.5 — 
Tax-exempt First Mortgage Bonds (a)
4.25%2027100.0 100.0 
Tax-exempt First Mortgage Bonds (b)
4.00%202740.0 40.0 
U.S. Government note4.20%206116.8 17.0 
Unamortized deferred financing costs(7.1)(6.9)
Unamortized debt discounts
(2.2)(2.4)
Total long-term debt at AES Ohio1,012.5 712.7 
Senior unsecured bonds4.125%2025415.0 415.0 
Senior unsecured bonds4.35%2029400.0 400.0 
Note to DPL Capital Trust II (c)
8.125%203115.6 15.6 
Unamortized deferred financing costs(4.9)(6.7)
Unamortized debt discounts
(0.6)(0.7)
Total long-term debt1,837.6 1,535.9 
Less: current portion(0.2)(0.2)
Long-term debt, net of current portion$1,837.4 $1,535.7 

(a)First mortgage bonds issued to the OAQDA, to secure the loan of proceeds from tax-exempt bonds issued by the OAQDA. The bonds have a final maturity date of November 1, 2040 but are subject to a mandatory put in June 2027.
(b)First mortgage bonds issued to the OAQDA, to secure the loan of proceeds from tax-exempt bonds issued by the OAQDA. The bonds have a final maturity date of January 1, 2034 but are subject to a mandatory put in June 2027.
(c)    Note payable to related party. See Note 11. Related Party Transactions for more information.
Long-term Debt Maturities
At December 31, 2023, maturities of long-term debt are summarized as follows:
Due during the years ending December 31,
$ in millions
2024$0.2 
2025415.2 
20260.2 
2027140.2 
202892.7 
Thereafter1,203.9 
1,852.4 
Unamortized debt discounts
(2.8)
Deferred financing costs, net(12.0)
Total long-term debt$1,837.6 
THE DAYTON POWER AND LIGHT COMPANY [Member]  
Debt Instrument [Line Items]  
Long-term Debt
$ in millionsInterest RateMaturityDecember 31, 2023December 31, 2022
First Mortgage Bonds3.95%2049$425.0 $425.0 
First Mortgage Bonds3.20%2040140.0 140.0 
First Mortgage Bonds5.70%2033107.5 — 
First Mortgage Bonds5.19%2033100.0 — 
First Mortgage Bonds5.49%202892.5 — 
Tax-exempt First Mortgage Bonds (a)
4.25%2027100.0 100.0 
Tax-exempt First Mortgage Bonds (b)
4.00%202740.0 40.0 
U.S. Government note4.20%206116.8 17.0 
Unamortized deferred financing costs(7.1)(6.9)
Unamortized debt discounts
(2.2)(2.4)
Total long-term debt1,012.5 712.7 
Less: current portion(0.2)(0.2)
Long-term debt, net of current portion$1,012.3 $712.5 

(a)First mortgage bonds issued to the OAQDA, to secure the loan of proceeds from tax-exempt bonds issued by the OAQDA. The bonds have a final maturity date of November 1, 2040 but are subject to a mandatory put in June 2027.
(b)First mortgage bonds issued to the OAQDA, to secure the loan of proceeds from tax-exempt bonds issued by the OAQDA. The bonds have a final maturity date of January 1, 2034 but are subject to a mandatory put in June 2027.

Revolving Credit Agreement
AES Ohio entered into a second amendment and restatement of the AES Ohio Credit Agreement on December 22, 2022 with a syndication of bank lenders. The AES Ohio Credit Agreement is an unsecured committed line of credit to be used: (i) to finance capital expenditures; (ii) to refinance certain existing indebtedness, (iii) to support working capital; and (iv) for general corporate purposes. This agreement matures on December 22, 2027, and bears interest
at variable rates as described in the agreement. It includes an uncommitted $100.0 million accordion feature to provide AES Ohio with an option to request an increase in the size of the facility, subject to approval by the lenders. The AES Ohio Credit Agreement also includes two one-year extension options, allowing AES Ohio to extend the maturity date subject to approval by the lenders. At December 31, 2023 and 2022, the AES Ohio Credit Agreement had outstanding borrowings of $15.0 million and $120.0 million, respectively.
Long-term Debt Maturities
At December 31, 2023, maturities of long-term debt are summarized as follows:
Due during the years ending December 31,
$ in millions
2024$0.2 
20250.2 
20260.2 
2027140.2 
202892.7 
Thereafter788.3 
1,021.8 
Unamortized debt discounts
(7.1)
Deferred financing costs, net(2.2)
Total long-term debt$1,012.5