Dispositions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	$ (14.3)	$ 22.4	$ (11.9)
Payments for Removal Costs	0.6	3.9	8.9
THE DAYTON POWER AND LIGHT COMPANY [Member]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	15.8	52.8	58.1
Payments for Removal Costs	$ 0.0	0.0	7.0
THE DAYTON POWER AND LIGHT COMPANY [Member] | Hutchings
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest			4.7
Payments for Removal Costs			$ 7.0
Payments for Removal Costs, Additional Payments		$ 2.3