Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Other Paid-In Capital [Member]	Accumulated Other Comprehensive Income/(Loss) [Member]	Retained Earnings [Member]	Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]	THE DAYTON POWER AND LIGHT COMPANY [Member]	THE DAYTON POWER AND LIGHT COMPANY [Member] Common Stock [Member]	THE DAYTON POWER AND LIGHT COMPANY [Member] Other Paid-In Capital [Member]	THE DAYTON POWER AND LIGHT COMPANY [Member] Accumulated Other Comprehensive Income/(Loss) [Member]	THE DAYTON POWER AND LIGHT COMPANY [Member] Retained Earnings [Member]
Other Comprehensive Income (Loss), Net of Tax	$ (8.7)						$ (5.2)
Balance at Dec. 31, 2019	(371.9)	$ 0.0	$ 2,370.7	$ (3.6)	$ (2,739.0)		473.4	$ 0.4	$ 617.0	$ (36.9)	$ (107.1)
Balance (in shares) at Dec. 31, 2019		1						41,172,173
Net loss	(1.0)						51.1
Common stock dividends							(52.7)		(52.7)
Equity Contribution from Parent	(98.0)		(98.0)				(150.0)		150.0
Other	0.1		0.1				(0.1)		(0.1)
Balance at Dec. 31, 2020	(283.5)	$ 0.0	2,468.8	(12.3)	(2,740.0)		616.7	$ 0.4	714.4	(42.1)	(56.0)
Balance (in shares) at Dec. 31, 2020		1						41,172,173
Non-cash capital contribution	98.0
Other Comprehensive Income (Loss), Net of Tax	7.5					$ (0.8)	10.3
Net loss	22.1						47.1
Common stock dividends							42.0		(42.0)
Equity Contribution from Parent	(132.5)		(132.5)				(150.0)		150.0
Other							(0.1)		(0.1)
Balance at Dec. 31, 2021	(121.4)	$ 0.0	2,601.3	(4.8)	(2,717.9)		782.2	$ 0.4	822.5	(31.8)	(8.9)
Balance (in shares) at Dec. 31, 2021		1						41,172,173
Non-cash capital contribution	132.5
Other Comprehensive Income (Loss), Net of Tax	2.4					$ (0.8)	5.0
Net loss	(4.7)						18.9
Common stock dividends							(64.0)		(49.0)		(15.0)
Equity Contribution from Parent	0.0						0.0
Other							0.3		(0.1)		0.4
Balance at Dec. 31, 2022	$ (123.7)	$ 0.0	$ 2,601.3	$ (2.4)	$ (2,722.6)		$ 741.8	$ 0.4	$ 773.6	$ (26.8)	$ (5.4)
Balance (in shares) at Dec. 31, 2022		1