Debt (Long-term Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Unamortized Deferred Financing Costs	$ (6.7)	$ (8.6)
Debt Instrument, Unamortized Discount	(3.1)
Debt Instrument, Unamortized Discount (Premium), Net	(0.7)	(0.8)
Total long-term debt at subsidiary	712.7	574.3
Less: current portion	(0.2)	(0.2)
Long-term debt, net of current portion	1,535.7	1,395.3
Long-Term Debt, Maturity, Year Two	0.2
Long-Term Debt, Maturity, Year Three	415.2
Long-Term Debt, Maturity, Year Four	0.2
Long-Term Debt, Maturity, Year Five	140.2
Long-Term Debt, Maturity, after Year Five	996.6
Total Maturities Before Unamortized Adjustments	1,552.6
Unamortized Deferred Financing Costs, Consolidated	(13.6)
Long Term Debt Maturities Repayments Of Principal, Total	1,535.9
Current portion - long-term debt	0.2
4.35% Senior Notes due 2029 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	400.0	400.0
3.2% Senior Notes due 2049
Debt Instrument [Line Items]
Long-term Debt, Gross	140.0	140.0
U.S. Government note maturing in 2061 - 4.20% [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 17.0	17.2
Ten Year Senior Unsecured Bonds At 435 Maturing At April 15 2029 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.35%
Ten Year Senior Unsecured Notes At725 Maturing At October152025
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.125%
Note to DPL Capital Trust II Maturing in 2031 - 8.125% [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 15.6	15.6
Debt Instrument, Interest Rate, Stated Percentage	8.125%
THE DAYTON POWER AND LIGHT COMPANY [Member]
Debt Instrument [Line Items]
Unamortized Deferred Financing Costs		(5.4)
Debt Instrument, Unamortized Discount	$ (6.9)	(2.5)
Debt Instrument, Unamortized Discount (Premium), Net	(2.4)	(2.5)
Less: current portion	(0.2)	(0.2)
Long-term debt, net of current portion	712.5	574.1
Long-Term Debt, Maturity, Year Two	0.2
Long-Term Debt, Maturity, Year Three	0.2
Long-Term Debt, Maturity, Year Four	0.2
Long-Term Debt, Maturity, Year Five	140.2
Long-Term Debt, Maturity, after Year Five	581.0
Total Maturities Before Unamortized Adjustments	722.0
Unamortized Deferred Financing Costs, Consolidated	(2.4)
Long Term Debt Maturities Repayments Of Principal, Total	712.7
Current portion - long-term debt	$ 0.2
THE DAYTON POWER AND LIGHT COMPANY [Member] \| 3.20% First Mortgage Bonds due 2040 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Minimum (Deprecated 2016-01-31)	3.20%
THE DAYTON POWER AND LIGHT COMPANY [Member] \| 4.25% Tax-exempt First Mortgage Bonds due 2027
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Minimum (Deprecated 2016-01-31)	4.25%
Long-term Debt, Gross	$ 100.0
THE DAYTON POWER AND LIGHT COMPANY [Member] \| 4.00% Tax-exempt First Mortgage Bonds due 2027
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Minimum (Deprecated 2016-01-31)	4.00%
Long-term Debt, Gross	$ 40.0
THE DAYTON POWER AND LIGHT COMPANY [Member] \| 3.2% Senior Notes due 2049
Debt Instrument [Line Items]
Long-term Debt, Gross	140.0	140.0
THE DAYTON POWER AND LIGHT COMPANY [Member] \| U.S. Government note maturing in 2061 - 4.20% [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 17.0	17.2
Debt Instrument, Interest Rate, Stated Percentage	4.20%
THE DAYTON POWER AND LIGHT COMPANY [Member] \| 3.95% Senior Notes due 2049 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Minimum (Deprecated 2016-01-31)	3.95%
Long-term Debt, Gross	$ 425.0	$ 425.0
Debt Instrument, Interest Rate, Stated Percentage	3.95%

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Total Long-term Debt At Subsidiary With Purchase Accounting Adjustments

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Total Maturities Before Unamortized Adjustments

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Unamortized Deferred Financing Costs

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Unamortized Deferred Financing Costs, Consolidated

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt discount.

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