Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 17.0	$ 53.2
Restricted Cash	16.8	13.5
Accounts receivable, net (Note 2)	200.9	203.3
Inventories (Note 2)	100.2	82.7
Taxes applicable to subsequent years	77.8	70.6
Regulatory assets, current (Note 3)	44.2	20.8
Other prepayments and current assets	41.8	35.1
Total current assets	498.7	479.2
Property, plant and equipment:
Property, plant and equipment	2,759.3	2,677.0
Less: Accumulated depreciation and amortization	(318.4)	(206.7)
Property, plant and equipment, net of depreciation	2,440.9	2,470.3
Construction work in process	76.7	63.9
Total net property, plant and equipment	2,517.6	2,534.2
Other noncurrent assets:
Regulatory assets, non-current (Note 3)	167.5	159.7
Goodwill (Note 5)	317.0	452.8
Intangible assets, Net of amortization (Note 5)	37.4
Other deferred assets	39.6	52.8
Total other noncurrent assets	561.5	708.1
Total Assets	3,577.8	3,721.5
Current liabilities:
Current portion - long-term debt (Note 6)	20.1	10.2
Accounts payable	109.2	78.2
Accrued taxes	102.6	89.4
Accrued interest	27.2	28.5
Customer security deposits	14.4	13.9
Regulatory liabilities, current (Note 3)	4.4
Insurance and claims costs	6.4	6.7
Other current liabilities	48.7	64.2
Total current liabilities	333.0	291.1
Noncurrent liabilities:
Long-term debt (Note 6)	2,139.6	2,284.2
Deferred taxes (Note 7)	587.3	564.3
Taxes Payable	80.9	79.1
Regulatory liabilities, non-current (Note 3)	124.1	121.1
Pension, retiree and other benefits (Note 8)	95.9	51.6
Unamortized investment tax credit	2.2	2.8
Other deferred credits	48.2	69.4
Total noncurrent liabilities	3,078.2	3,172.5
Redeemable preferred stock of subsidiary	18.4	18.4
Common shareholders' equity:
Other paid-in capital	2,237.4	2,237.0
Accumulated other comprehensive loss	7.5	24.6
Retained earnings/ (deficit)	(2,096.7)	(2,022.1)
Total common shareholders' equity	148.2	239.5
Total Liabilities and Shareholders' Equity	3,577.8	3,721.5
THE DAYTON POWER AND LIGHT COMPANY [Member]
Current assets:
Cash and cash equivalents	5.4	22.9
Restricted Cash	16.7	13.0
Accounts receivable, net (Note 2)	152.7	147.5
Inventories (Note 2)	99.0	81.7
Taxes applicable to subsequent years	75.4	68.5
Regulatory assets, current (Note 3)	44.2	20.8
Other prepayments and current assets	41.1	32.5
Total current assets	434.5	386.9
Property, plant and equipment:
Property, plant and equipment	5,120.7	5,105.3
Less: Accumulated depreciation and amortization	(2,495.7)	(2,448.1)
Property, plant and equipment, net of depreciation	2,625.0	2,657.2
Construction work in process	75.4	60.9
Total net property, plant and equipment	2,700.4	2,718.1
Other noncurrent assets:
Regulatory assets, non-current (Note 3)	167.5	159.7
Intangible assets, Net of amortization (Note 5)	7.8	8.3
Other deferred assets	28.5	40.1
Total other noncurrent assets	203.8	208.1
Total Assets	3,338.7	3,313.1
Current liabilities:
Current portion - long-term debt (Note 6)	0.1	0.2
Accounts payable	104.8	73.9
Accrued taxes	82.6	81.0
Accrued interest	9.8	9.6
Customer security deposits	34.5	33.1
Regulatory liabilities, current (Note 3)	4.4
Other current liabilities	44.8	59.7
Total current liabilities	281.0	257.5
Noncurrent liabilities:
Long-term debt (Note 6)	877.0	876.9
Deferred taxes (Note 7)	650.0	632.3
Taxes Payable	78.4	76.5
Regulatory liabilities, non-current (Note 3)	124.1	121.1
Pension, retiree and other benefits (Note 8)	95.9	51.6
Unamortized investment tax credit	22.4	24.9
Other deferred credits	43.6	45.4
Total noncurrent liabilities	1,891.4	1,828.7
Redeemable preferred stock of subsidiary	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	803.5	803.5
Accumulated other comprehensive loss	(42.3)	(26.7)
Retained earnings/ (deficit)	381.8	426.8
Total common shareholders' equity	1,143.4	1,204.0
Total Liabilities and Shareholders' Equity	3,338.7	3,313.1
Successor [Member]
Current assets:
Cash and cash equivalents	17.0	53.2
Common shareholders' equity:
Total common shareholders' equity	$ 148.2	$ 239.5