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Dispositions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest $ 10.8 $ 42.3 $ (14.3)
THE DAYTON POWER AND LIGHT COMPANY [Member]      
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest $ 40.1 $ 74.9 $ 15.8