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Income Taxes (Effective and Statutory Rate Reconciliation) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Entity Information [Line Items]      
Non-cash capital contribution   $ 98.0  
Statutory Federal tax rate 21.00% 21.00% 21.00%
State taxes, net of Federal tax benefit 2.80% (13.10%) 1.40%
Depreciation of flow-through differences 3.30% (23.60%) (0.10%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depreciation and Amortization, Percent (29.00%) 94.80% (28.20%)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (0.60%) 4.10% (0.30%)
Other, net (0.80%) 1.20% (0.10%)
Effective tax rate (3.30%) 84.40% (6.30%)
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 1.10% 1.50% 1.30%
Depreciation of flow-through differences 1.30% 2.60% (0.10%)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent (0.20%) (0.50%) (0.20%)
Effective Income Tax Rate Reconciliation, Depreciation of flow-through years (11.70%) (10.60%) (22.60%)
Effective Income Tax Rate Reconciliation, Change in Tax Reserves, Percent (0.10%) (6.10%) 0.00%
Other, net (0.60%) 4.10% 0.10%
Effective tax rate 10.80% 12.00% (0.50%)