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Debt (Narrative) (Details)
$ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
debt_covenant
fiscal_quarter
Sep. 30, 2020
USD ($)
Dec. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2020
USD ($)
Aug. 03, 2020
USD ($)
Jun. 01, 2020
USD ($)
Debt Instrument [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity   $ 110.0          
Long-term Line of Credit $ 80.0       $ 80.0    
Debt Covenant, Leverage Ratio, Maximum 0.67            
Debt Covenant, Interest Coverage Ratio, Minimum 1.70           2.25
Proceeds from Issuance of Long-term Debt $ 0.0 555.0          
Debt Instrument, Debt Covenant, EBITDA to Interest Expense, EBITDA Minimum $ 125.0 125.0          
Debt Instrument, Debt Covenant, Total Debt to EBITDA Ratio 7.00            
Line of Credit Facility, quarterly borrowing limit reduction $ 5.0            
Line of Credit Facility, Current Borrowing Capacity             $ 125.0
Less: current portion (0.2)       (0.2)    
Debt Instrument, Unamortized Discount (Premium), Net (0.9)       (0.9)    
Debt Instrument, Debt Covenant, Total Debt to EBITDA, Borrowing Limit 110.0            
Debt Instrument, Debt Covenant, Total Debt to EBITDA, New Borrowing Limit 105.0            
Debt Instrument, Debt Covenant, Total Debt to EBITDA, Borrowing Limit Quarterly Reduction 5.0            
Phase 1 [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Debt Covenant, EBITDA to Interest Expense, EBITDA Minimum       $ 130.0      
Phase 2 [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Debt Covenant, EBITDA to Interest Expense, EBITDA Minimum     $ 150.0        
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 140.0       20.0    
Proceeds from Issuance of Long-term Debt 0.0 $ 140.0          
Less: current portion (0.2)       (0.2)    
Deferred Finance Costs, Net, Including Acquisition Adjustments (5.5)       (5.7)    
Debt Instrument, Unamortized Discount (Premium), Net (2.5)       (2.6)    
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%            
Variable Rate Notes Backed by Term Loan and First Mortgage Bonds [Member] | Subsidiaries [Member]              
Debt Instrument [Line Items]              
Long-term Debt, Gross $ 140.0         $ 140.0  
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            
Ten Year Senior Unsecured Notes At725 Maturing At October152021 [Member]              
Debt Instrument [Line Items]              
Debt instrument interest percentage   7.25%          
Make Whole Premium   $ 30.8          
Extinguishment of Debt, Amount   $ 380.0          
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            
4.125% Senior Notes due 2025 [Member]              
Debt Instrument [Line Items]              
Debt instrument interest percentage   4.125%          
Proceeds from Issuance of Long-term Debt   $ 415.0          
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 percentage 3.20%            
Proceeds from Issuance of Long-term Debt   $ 140.0          
Debt Instrument, Interest Rate, Effective Percentage 3.20%            
One Point One Three To One Point One Seven Bonds Maturing In August Two Thousand Twenty [Member]              
Debt Instrument [Line Items]              
Long-term Debt, Gross           140.0  
One Point One Three To One Point One Seven Bonds Maturing In August Two Thousand Twenty [Member] | Subsidiaries [Member]              
Debt Instrument [Line Items]              
Long-term Debt, Gross           $ 140.0