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Debt (Narrative) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
fiscal_quarter
debt_covenant
Dec. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Debt Instrument [Line Items]        
Long-term Line of Credit $ 65.0     $ 65.0
Debt Covenant, Leverage Ratio, Maximum 0.67      
Debt Covenant, Interest Coverage Ratio, Minimum 1.70      
Debt Instrument, Debt Covenant, EBITDA to Interest Expense, EBITDA Minimum $ 125.0      
Less: current portion (0.2)     (0.2)
Debt Instrument, Unamortized Discount (Premium), Net (0.8)     (0.8)
Debt Instrument, Debt Covenant, Total Debt to EBITDA, Borrowing Limit 100.0      
Debt Instrument, Debt Covenant, Total Debt to EBITDA, New Borrowing Limit 95.0      
Debt Instrument, Debt Covenant, Total Debt to EBITDA, Borrowing Limit Quarterly Reduction 5.0      
Forecast [Member]        
Debt Instrument [Line Items]        
Debt Covenant, Interest Coverage Ratio, Minimum   2.00 1.75  
Debt Instrument, Debt Covenant, EBITDA to Interest Expense, EBITDA Minimum   $ 150.0 $ 130.0  
Subsidiaries [Member]        
Debt Instrument [Line Items]        
Long-term Line of Credit 75.0     0.0
Less: current portion (0.2)     (0.2)
Deferred Finance Costs, Net, Including Acquisition Adjustments (5.3)     (5.4)
Debt Instrument, Unamortized Discount (Premium), Net (2.5)     (2.5)
3.95% Senior Notes due 2049 [Member] | Subsidiaries [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 425.0     425.0
Debt Instrument, Interest Rate, Effective Percentage 3.95%      
DPL Revolving Credit Agreement and Term Loan Maturing July 2020 [Member]        
Debt Instrument [Line Items]        
Number of financial covenants | debt_covenant 2      
Number of prior quarters included in EBITDA to interest calculation | fiscal_quarter 4      
Debt Covenant, Interest Coverage Ratio, Minimum 2.50      
Revolving Credit Facility [Member] | Subsidiaries [Member]        
Debt Instrument [Line Items]        
Debt Covenant, Debt to EBITDA Ratio, Maximum 7.00      
Debt Covenant, Total Debt to Total Capitalization Ratio, Maximum 0.67      
3.25% First Mortgage Bonds due 2040 [Member] | Subsidiaries [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 140.0     140.0
Debt Instrument, Interest Rate, Effective Percentage 3.20%      
U.S. Government note maturing in February 2061 - 4.20% [Member] | Subsidiaries [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 17.1     $ 17.2
Debt instrument interest percentage 4.20%