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Debt (Narrative) (Details)
$ in Millions
9 Months Ended
Sep. 30, 2020
USD ($)
fiscal_quarter
debt_covenant
Sep. 30, 2019
USD ($)
Dec. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Aug. 03, 2020
USD ($)
Jun. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity $ 110.0            
Long-term Line of Credit 90.0           $ 104.0
Retirement of long-term debt $ 550.8 $ 978.0          
Debt Covenant, Leverage Ratio, Maximum 0.67            
Debt Covenant, Interest Coverage Ratio, Minimum 1.70         2.25  
Interest Coverage Ratio 2.72            
Line of Credit Facility, Current Borrowing Capacity           $ 125.0  
Proceeds from Issuance of Long-term Debt $ 555.0 821.7          
Debt Instrument, Debt Covenant, EBITDA to Interest Expense, EBITDA Minimum $ 125.0            
Debt Instrument, Debt Covenant, Total Debt to EBITDA Ratio 7.00            
Line of Credit Facility, quarterly borrowing limit 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 0.0           40.0
Retirement of long-term debt 140.0 436.1          
Proceeds from Issuance of Long-term Debt 140.0 $ 422.3          
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] | Maximum [Member]              
Debt Instrument [Line Items]              
Debt instrument interest percentage             2.47%
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   $ 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]              
Long-term Debt, Gross             $ 380.0
Debt instrument interest percentage 7.25%            
Make Whole Premium $ 30.8            
Revolving Credit Facility [Member] | Subsidiaries [Member]              
Debt Instrument [Line Items]              
Debt Covenant, Total Debt to Total Capitalization Ratio, Maximum 0.67            
Total Debt to Total Capitalization Ratio 0.48            
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            
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] | Maximum [Member]              
Debt Instrument [Line Items]              
Debt instrument interest percentage 2.93%           2.47%
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