Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 559.1	$ 192.1
Restricted Cash	7.3	10.7
Accounts receivable, net (Note 2)	180.2	208.2
Inventories (Note 2)	91.6	110.1
Taxes applicable to subsequent years	17.2	69.3
Regulatory assets, current (Note 3)	12.2	21.1
Other prepayments and current assets	45.0	43.1
Total current assets	912.6	654.6
Property, plant and equipment:
Property, plant and equipment	2,684.2	2,590.4
Less: Accumulated depreciation and amortization	(182.2)	(115.9)
Property, plant and equipment, net of depreciation	2,502.0	2,474.5
Construction work in process	52.9	89.3
Total net property, plant and equipment	2,554.9	2,563.8
Other noncurrent assets:
Regulatory assets, non-current (Note 3)	172.4	185.5
Goodwill	759.1	759.1
Intangible assets, Net of amortization	44.1	50.1
Other deferred assets	63.0	34.2
Total other noncurrent assets	1,038.6	1,028.9
Total Assets	4,506.1	4,247.3
Current liabilities:
Current portion - long-term debt (Note 5)	480.4	584.9
Accounts payable	67.9	83.2
Accrued taxes	95.8	97.1
Accrued interest	56.3	31.8
Customer security deposits	14.2	15.0
Regulatory liabilities, current (Note 3)		0.1
Insurance and claims costs	9.1	11.5
Other current liabilities	56.2	96.9
Total current liabilities	779.9	920.5
Noncurrent liabilities:
Long-term debt (Note 5)	2,334.1	2,025.0
Deferred taxes (Note 6)	576.0	534.9
Taxes Payable	8.9	68.1
Regulatory liabilities, non-current (Note 3)	118.0	117.3
Pension, retiree and other benefits	63.9	61.6
Unamortized investment tax credit	2.9	3.3
Other deferred credits	73.0	71.4
Total noncurrent liabilities	3,176.8	2,881.6
Redeemable preferred stock	18.4	18.4
Common shareholders' equity:
Other paid-in capital	2,236.9	2,236.7
Accumulated other comprehensive loss	18.2	(3.9)
Retained deficit	(1,724.1)	(1,806.0)
Total common shareholders' equity	531.0	426.8
Total Liabilities and Shareholders' Equity	4,506.1	4,247.3
THE DAYTON POWER AND LIGHT COMPANY [Member]
Current assets:
Cash and cash equivalents	510.4	28.5
Restricted Cash	7.3	10.7
Accounts receivable, net (Note 2)	132.2	160.0
Inventories (Note 2)	90.4	108.9
Taxes applicable to subsequent years	16.7	66.7
Regulatory assets, current (Note 3)	10.8	18.3
Other prepayments and current assets	37.4	33.0
Total current assets	805.2	426.1
Property, plant and equipment:
Property, plant and equipment	5,314.6	5,249.0
Less: Accumulated depreciation and amortization	(2,563.2)	(2,516.3)
Property, plant and equipment, net of depreciation	2,751.4	2,732.7
Construction work in process	50.7	87.8
Total net property, plant and equipment	2,802.1	2,820.5
Other noncurrent assets:
Regulatory assets, non-current (Note 3)	172.4	185.5
Intangible assets, Net of amortization	8.8	9.0
Other deferred assets	49.0	23.1
Total other noncurrent assets	230.2	217.6
Total Assets	3,837.5	3,464.2
Current liabilities:
Current portion - long-term debt (Note 5)	470.3	570.4
Accounts payable	63.6	79.1
Accrued taxes	110.0	92.2
Accrued interest	15.9	13.1
Customer security deposits	33.3	35.2
Regulatory liabilities, current (Note 3)		0.1
Other current liabilities	50.8	52.1
Total current liabilities	743.9	842.2
Noncurrent liabilities:
Long-term debt (Note 5)	876.9	332.7
Deferred taxes (Note 6)	680.4	652.0
Taxes Payable	8.5	66.0
Regulatory liabilities, non-current (Note 3)	118.0	117.3
Pension, retiree and other benefits	63.9	61.6
Unamortized investment tax credit	25.5	27.4
Other deferred credits	47.9	43.0
Total noncurrent liabilities	1,821.1	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	803.4	803.2
Accumulated other comprehensive loss	(34.1)	(38.7)
Retained deficit	479.9	534.2
Total common shareholders' equity	1,249.6	1,299.1
Total Liabilities and Shareholders' Equity	$ 3,837.5	$ 3,464.2