Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 99.5	$ 192.1
Restricted Cash	8.9	10.7
Accounts receivable, net (Note 2)	177.5	208.2
Inventories (Note 2)	101.0	110.1
Taxes applicable to subsequent years	34.4	69.3
Regulatory assets, current (Note 3)	14.4	21.1
Other prepayments and current assets	49.1	43.1
Total current assets	484.8	654.6
Property, plant and equipment:
Property, plant and equipment	2,655.8	2,590.4
Less: Accumulated depreciation and amortization	(156.5)	(115.9)
Property, plant and equipment, net of depreciation	2,499.3	2,474.5
Construction work in process	62.8	89.3
Total net property, plant and equipment	2,562.1	2,563.8
Other noncurrent assets:
Regulatory assets, non-current (Note 3)	177.4	185.5
Goodwill	759.1	759.1
Intangible assets, Net of amortization	48.6	50.1
Other deferred assets	46.2	34.2
Total other noncurrent assets	1,031.3	1,028.9
Total Assets	4,078.2	4,247.3
Current liabilities:
Current portion - long-term debt (Note 5)	475.3	584.9
Accounts payable	68.0	83.2
Accrued taxes	54.1	97.1
Accrued interest	32.8	31.8
Revolving credit borrowings	50.0
Customer security deposits	14.4	15.0
Regulatory liabilities, current (Note 3)		0.1
Insurance and claims costs	10.9	11.5
Other current liabilities	69.6	96.9
Total current liabilities	775.1	920.5
Noncurrent liabilities:
Long-term debt (Note 5)	1,899.9	2,025.0
Deferred taxes (Note 6)	564.8	534.9
Taxes Payable	76.8	68.1
Regulatory liabilities, non-current (Note 3)	118.0	117.3
Pension, retiree and other benefits	64.7	61.6
Unamortized investment tax credit	3.0	3.3
Other deferred credits	67.9	71.4
Total noncurrent liabilities	2,795.1	2,881.6
Redeemable preferred stock	18.4	18.4
Common shareholders' equity:
Other paid-in capital	2,236.8	2,236.7
Accumulated other comprehensive loss	10.1	(3.9)
Retained deficit	(1,757.3)	(1,806.0)
Total common shareholders' equity	489.6	426.8
Total Liabilities and Shareholders' Equity	4,078.2	4,247.3
THE DAYTON POWER AND LIGHT COMPANY [Member]
Current assets:
Cash and cash equivalents	25.4	28.5
Restricted Cash	8.9	10.7
Accounts receivable, net (Note 2)	131.8	160.0
Inventories (Note 2)	99.8	108.9
Taxes applicable to subsequent years	33.3	66.7
Regulatory assets, current (Note 3)	13.0	18.3
Other prepayments and current assets	41.3	33.0
Total current assets	353.5	426.1
Property, plant and equipment:
Property, plant and equipment	5,291.3	5,249.0
Less: Accumulated depreciation and amortization	(2,539.9)	(2,516.3)
Property, plant and equipment, net of depreciation	2,751.4	2,732.7
Construction work in process	61.7	87.8
Total net property, plant and equipment	2,813.1	2,820.5
Other noncurrent assets:
Regulatory assets, non-current (Note 3)	177.4	185.5
Intangible assets, Net of amortization	10.7	9.0
Other deferred assets	31.5	23.1
Total other noncurrent assets	219.6	217.6
Total Assets	3,386.2	3,464.2
Current liabilities:
Current portion - long-term debt (Note 5)	470.4	570.4
Accounts payable	64.0	79.1
Accrued taxes	62.4	92.2
Accrued interest	13.7	13.1
Customer security deposits	33.6	35.2
Regulatory liabilities, current (Note 3)		0.1
Other current liabilities	53.5	52.1
Total current liabilities	697.6	842.2
Noncurrent liabilities:
Long-term debt (Note 5)	432.7	332.7
Deferred taxes (Note 6)	676.0	652.0
Taxes Payable	74.5	66.0
Regulatory liabilities, non-current (Note 3)	118.0	117.3
Pension, retiree and other benefits	64.7	61.6
Unamortized investment tax credit	26.1	27.4
Other deferred credits	41.6	43.0
Total noncurrent liabilities	1,433.6	1,300.0
Redeemable preferred stock	22.9	22.9
Common shareholders' equity:
Common stock, at par value of $0.01 per share:	0.4	0.4
Other paid-in capital	803.3	803.2
Accumulated other comprehensive loss	(35.8)	(38.7)
Retained deficit	464.2	534.2
Total common shareholders' equity	1,232.1	1,299.1
Total Liabilities and Shareholders' Equity	$ 3,386.2	$ 3,464.2