Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 54.0	$ 41.0
Restricted cash	0.1	0.1
Accounts receivable, net	106.8	92.5
Inventories	70.5	44.5
Taxes applicable to subsequent years	137.1	113.0
Regulatory Assets, Current	82.0	56.6
Income Taxes Receivable, Current	27.1	8.9
Prepayments and other current assets	7.5	6.6
Total current assets	485.0	363.1
Carrying Value	2,571.4	2,221.0
Assets, Noncurrent [Abstract]
Regulatory Assets, Noncurrent	140.0	155.7
Intangible assets, net of amortization	175.1	114.0
Other Assets, Noncurrent	45.9	52.4
Assets, Noncurrent	2,932.4	2,543.1
Total assets	3,417.4	2,906.2
LIABILITIES AND SHAREHOLDER'S EQUITY
Current portion - long-term debt	704.4	15.2
Accounts payable	132.1	163.9
Accrued interest	22.8	16.9
Accrued taxes	115.4	101.6
Customer security deposits	14.2	12.7
Regulatory Liability, Current	10.3	18.0
Other current liabilities	35.0	22.6
Total current liabilities	1,034.2	350.9
Non-current liabilities:
Long-term debt	1,425.6	1,837.4
Deferred Income Tax Liabilities, Net	249.6	227.3
Taxes payable	137.5	113.4
Regulatory Liability, Noncurrent	169.4	182.1
Pension, retiree and other benefits	30.7	37.7
Other deferred credits	8.3	8.5
Total non-current liabilities	2,021.1	2,406.4
Liabilities	3,055.3	2,757.3
Commitments and contingencies
Common stock, shares outstanding	1	1
Common stock, shares authorized	1,500	1,500
Common shareholder's equity:
Common stock	$ 0.0	$ 0.0
Other paid-in capital	3,040.5	2,840.4
Accumulated other comprehensive income/(loss)	(5.3)	(4.6)
Retained earnings / (deficit)	(2,673.1)	(2,686.9)
Total common shareholder's equity	362.1	148.9
Total Liabilities and Shareholder's Equity	3,417.4	2,906.2
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	571.7	535.1
THE DAYTON POWER AND LIGHT COMPANY [Member]
Current assets:
Cash and cash equivalents	24.6	15.5
Restricted cash	0.1	0.1
Accounts receivable, net	106.6	93.1
Inventories	69.0	44.5
Taxes applicable to subsequent years	137.1	112.9
Regulatory Assets, Current	82.0	56.6
Income Taxes Receivable, Current	24.9	24.4
Prepayments and other current assets	8.4	8.1
Total current assets	452.6	355.1
Carrying Value	2,546.2	2,195.9
Assets, Noncurrent [Abstract]
Regulatory Assets, Noncurrent	140.0	155.7
Intangible assets, net of amortization	173.2	111.4
Other Assets, Noncurrent	43.2	52.9
Assets, Noncurrent	2,902.6	2,515.9
Total assets	3,355.2	2,871.0
LIABILITIES AND SHAREHOLDER'S EQUITY
Current portion - long-term debt	290.1	15.2
Accounts payable	132.1	163.8
Accrued interest	10.2	4.2
Accrued taxes	115.2	101.4
Customer security deposits	14.2	12.7
Regulatory Liability, Current	10.3	18.0
Other current liabilities	32.2	20.2
Total current liabilities	604.3	335.5
Non-current liabilities:
Long-term debt	1,012.7	1,012.3
Deferred Income Tax Liabilities, Net	217.6	206.1
Taxes payable	137.5	113.4
Regulatory Liability, Noncurrent	169.4	182.1
Pension, retiree and other benefits	30.7	37.7
Other deferred credits	5.2	4.7
Total non-current liabilities	1,573.1	1,556.3
Liabilities	2,177.4	1,891.8
Commitments and contingencies
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, shares outstanding	41,172,173	41,172,173
Common stock, shares authorized	50,000,000
Common shareholder's equity:
Common stock	$ 0.4	$ 0.4
Other paid-in capital	1,177.6	977.4
Accumulated other comprehensive income/(loss)	(26.4)	(27.9)
Retained earnings / (deficit)	26.2	29.3
Total common shareholder's equity	1,177.8	979.2
Total Liabilities and Shareholder's Equity	3,355.2	2,871.0
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 1,115.5	$ 1,098.1