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Income Taxes (Effective and Statutory Rate Reconciliation) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Entity Information [Line Items]      
Non-cash capital contribution     $ 132.5
Statutory Federal tax rate 21.00% 21.00% 21.00%
State taxes, net of Federal tax benefit 2.50% (1.60%) 2.80%
Depreciation of flow-through differences (0.20%) 2.50% 3.30%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depreciation and Amortization, Percent (7.60%) 43.80% (29.00%)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent 0.00% 0.10% (0.60%)
Other, net (0.10%) 1.30% (0.80%)
Effective tax rate 15.60% 67.10% (3.30%)
THE DAYTON POWER AND LIGHT COMPANY [Member]      
Entity Information [Line Items]      
Statutory Federal tax rate 21.00% 21.00% 21.00%
State taxes, net of Federal tax benefit 1.40% 1.40% 1.10%
Depreciation of flow-through differences (0.10%) (2.20%) 1.30%
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent 0.00% (0.10%) (0.20%)
Effective Income Tax Rate Reconciliation, Depreciation of flow-through years (4.30%) (39.40%) (11.70%)
Effective Income Tax Rate Reconciliation, Change in Tax Reserves, Percent 0.00% 0.00% (0.10%)
Other, net 0.00% (0.30%) (0.60%)
Effective tax rate 18.00% (19.60%) 10.80%