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Debt (Narrative) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2021
USD ($)
debt_covenant
fiscal_quarter
Jun. 30, 2020
USD ($)
Dec. 31, 2023
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 1.70           2.25
Proceeds from Issuance of Long-term Debt $ 0.0 $ 415.0            
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)    
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 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 100.0         20.0    
Less: current portion (0.2)         (0.2)    
Deferred Finance Costs, Net, Including Acquisition Adjustments (5.7)         (5.7)    
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              
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, 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 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