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Debt (Long-term Debt) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Jun. 01, 2020
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]            
Unamortized deferred finance costs $ (11.9)         $ (5.9)
Unamortized debt discounts and premiums, net (1.0)         (1.0)
Total long-term debt 1,772.0         1,363.1
Less: current portion (379.2)         (139.8)
Long-term debt 1,392.8         1,223.3
Long-term Line of Credit $ 0.0         104.0
Debt Covenant, Interest Coverage Ratio, Minimum 1.70       2.25  
Debt Instrument, Debt Covenant, EBITDA to Interest Expense, EBITDA Minimum $ 125.0          
Proceeds from Issuance of Long-term Debt 415.0 $ 821.7        
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    
THE DAYTON POWER AND LIGHT COMPANY [Member]            
Debt Instrument [Line Items]            
Unamortized deferred finance costs (5.5)         (5.4)
Unamortized deferred finance costs (5.5)         (5.4)
Unamortized debt discounts and premiums, net (2.6)         (2.7)
Unamortized debt discounts and premiums, net (2.6)         (2.7)
Total long-term debt at subsidiary 574.3         574.4
Total long-term debt 574.3         574.4
Less: current portion (0.1)         (139.8)
Long-term debt 574.2         434.6
Long-term Line of Credit 0.0         40.0
Proceeds from Issuance of Long-term Debt $ 0.0 $ 422.3        
Term Loan Maturing 2022 [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Effective Percentage 3.95%          
3.95% Senior Notes due 2049 [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]            
Debt Instrument [Line Items]            
Long-term Debt, Gross $ 425.0         425.0
DPL Revolving Credit Agreement and Term Loan Maturing July 2020 [Member]            
Debt Instrument [Line Items]            
Debt Covenant, Interest Coverage Ratio, Minimum 2.50          
Pollution Control Series Maturing in August 2020 - 1.13% - 1.14% [Member]            
Debt Instrument [Line Items]            
Debt instrument interest percentage 4.20%          
Pollution Control Series Maturing in August 2020 - 1.13% - 1.14% [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]            
Debt Instrument [Line Items]            
Long-term Debt, Gross $ 140.0         140.0
U.S. Government note maturing in February 2061 - 4.20% [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]            
Debt Instrument [Line Items]            
Long-term Debt, Gross 17.4         17.5
Senior unsecured due in October 2021 - 7.25% [Member]            
Debt Instrument [Line Items]            
Long-term Debt, Gross $ 380.0         380.0
Debt instrument interest percentage 7.25%          
Extinguishment of Debt, Amount $ 380.0          
4.35% Senior Notes due 2029 [Member]            
Debt Instrument [Line Items]            
Long-term Debt, Gross $ 400.0         400.0
Debt instrument interest percentage 4.35%          
Note to DPL Capital Trust II Maturing in September 2031 - 8.125% [Member]            
Debt Instrument [Line Items]            
Long-term Debt, Gross $ 15.6         $ 15.6
Debt instrument interest percentage 8.125%          
4.13% Senior Notes due 2025            
Debt Instrument [Line Items]            
Long-term Debt, Gross $ 415.0          
Debt instrument interest percentage 4.13%          
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] | THE DAYTON POWER AND LIGHT COMPANY [Member]            
Debt Instrument [Line Items]            
Long-term Debt, Gross $ 140.0          
Debt instrument interest percentage 320.00%          
Proceeds from Issuance of Long-term Debt $ 140.0          
Maximum [Member] | Pollution Control Series Maturing in August 2020 - 1.13% - 1.14% [Member]            
Debt Instrument [Line Items]            
Debt instrument interest percentage           2.47%
Maximum [Member] | Zero Point Two Three To Zero Point Two Nine And Zero Point One Six To Zero Point Three Six Percentage Of Bonds Maturing In November Two Thousand Forty [Member]            
Debt Instrument [Line Items]            
Debt instrument interest percentage 2.93%          
Minimum [Member] | Term Loan Maturing 2022 [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Effective Percentage 3.95%          
Minimum [Member] | Pollution Control Series Maturing in August 2020 - 1.13% - 1.14% [Member]            
Debt Instrument [Line Items]            
Debt instrument interest percentage 4.20%         1.15%
Minimum [Member] | Zero Point Two Three To Zero Point Two Nine And Zero Point One Six To Zero Point Three Six Percentage Of Bonds Maturing In November Two Thousand Forty [Member]            
Debt Instrument [Line Items]            
Debt instrument interest percentage 2.40%