Derivative Instruments and Hedging Activities (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2015

Mar. 31, 2014

Dec. 31, 2014

Schedule of Notional Amounts of Outstanding Derivative Positions

Commodity	Accounting Treatment		Unit	Purchases (in thousands)		Sales (in thousands)		Net Purchases/ (Sales) (in thousands)
FTRs		Mark to Market	MWh		4.2		-		4.2
Heating oil futures		Mark to Market	Gallons		252.0		-		252.0
Forward power contracts		Cash Flow Hedge	MWh		843.5		(3,708.3)		(2,864.8)
Forward power contracts		Mark to Market	MWh		1,565.1		(4,826.9)		(3,261.8)

Commodity	Accounting Treatment		Unit	Purchases (in thousands)		Sales (in thousands)		Net Purchases/ (Sales) (in thousands)
FTRs		Mark to Market	MWh		10.5		-		10.5
Heating oil futures		Mark to Market	Gallons		378.0		-		378.0
Natural gas futures		Mark to Market	Dths		200.0		-		200.0
Forward power contracts		Cash Flow Hedge	MWh		175.0		(2,991.0)		(2,816.0)
Forward power contracts		Mark to Market	MWh		1,725.2		(2,707.8)		(982.6)

Gains or Losses Recognized in AOCI for the Cash Flow Hedges

	Three months ended				Three months ended
	March 31, 2015				March 31, 2014
			Interest				Interest
$ in millions (net of tax)	Power		Rate Hedge		Power		Rate Hedge
Beginning accumulated derivative gain in AOCI	$	0.2	$	18.3	$	1.4	$	19.2
Net gains / (losses) associated with current period hedging transactions		0.1		-		(12.9)		-
Net gains / (losses) reclassified to earnings
Interest expense		-		(0.1)		-		(0.3)
Revenues		(0.2)		-		6.5		-
Purchased power		0.9		-		(0.7)		-
Ending accumulated derivative gain / (loss) in AOCI	$	1.0	$	18.2	$	(5.7)	$	18.9
Portion expected to be reclassified to earnings in the next twelve months (a)	$	1.1	$	0.9
Maximum length of time that we are hedging our exposure to variability in future cash flows related to forecasted transactions (in months)		21		0

Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location

For the three months ended March 31, 2015
$ in millions	Heating Oil		FTRs		Power		Natural Gas		Total
Change in unrealized gain / (loss)	$	0.1	$	0.9	$	(2.9)	$	0.1	$	(1.8)
Realized loss		(0.1)		(0.1)		(2.3)		(0.1)		(2.6)
Total	$	-	$	0.8	$	(5.2)	$	-	$	(4.4)
Recorded in Income Statement: gain / (loss)
Purchased power		-		0.8		(4.9)		-		(4.1)
Revenue		-		-		(0.3)		-		(0.3)
Total	$	-	$	0.8	$	(5.2)	$	-	$	(4.4)

For the three months ended March 31, 2014
$ in millions	Heating Oil		FTRs		Power		Total
Change in unrealized loss	$	(0.1)	$	(0.3)	$	(5.5)	$	(5.9)
Realized gain / (loss)		0.1		-		(2.0)		(1.9)
Total	$	-	$	(0.3)	$	(7.5)	$	(7.8)
Recorded in Income Statement: loss
Purchased power		-		(0.3)		(7.5)		(7.8)
Fuel		-		-		-		-
Total	$	-	$	(0.3)	$	(7.5)	$	(7.8)

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

Fair Values of Derivative Instruments
at March 31, 2015
				Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets
$ in millions	Hedging Designation	Gross Fair Value as presented in the Condensed Consolidated Balance Sheets		Financial Instruments with Same Counterparty in Offsetting Position		Cash Collateral			Net Balance Fair Value
Assets
Short-term derivative positions (presented in Other current assets)
Forward power contracts	Cash Flow	$	5.2	$	(2.5)	$	-	$	2.7
Forward power contracts	MTM		4.9		(3.2)		-		1.7
FTRs	MTM		0.3		-		-		0.3
Long-term derivative positions (presented in Other deferred assets)
Forward power contracts	Cash Flow		3.8		(2.7)		-		1.1
Forward power contracts	MTM		6.4		(0.6)		-		5.8
Total assets		$	20.6	$	(9.0)	$	-	$	11.6
Liabilities
Short-term derivative positions (presented in Other current liabilities)
Forward power contracts	Cash Flow	$	4.1	$	(2.5)	$	(1.6)	$	-
Forward power contracts	MTM		13.0		(3.2)		(8.8)		1.0
Heating oil	MTM		0.3		-		(0.3)		-
FTRs	MTM		-		-		-		-
Long-term derivative positions (presented in Other deferred liabilities)
Forward power contracts	Cash Flow		2.7		(2.7)		-		-
Forward power contracts	MTM		0.6		(0.6)		-		-
Total liabilities		$	20.7	$	(9.0)	$	(10.7)	$	1.0

Fair Values of Derivative Instruments
at December 31, 2014
				Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets
$ in millions	Hedging Designation	Gross Fair Value as presented in the Condensed Consolidated Balance Sheets		Financial Instruments with Same Counterparty in Offsetting Position		Cash Collateral			Net Balance Fair Value
Assets
Short-term derivative positions (presented in Other current assets)
Forward power contracts	Cash Flow	$	5.6	$	(2.0)	$	-	$	3.6
Forward power contracts	MTM		5.5		(3.4)		-		2.1
Long-term derivative positions (presented in Other deferred assets)
Forward power contracts	Cash Flow		0.3		(0.3)		-		-
Forward power contracts	MTM		3.5		(0.9)		-		2.6
Total assets		$	14.9	$	(6.6)	$	-	$	8.3
Liabilities
Short-term derivative positions (presented in Other current liabilities)
Forward power contracts	Cash Flow	$	2.1	$	(2.0)	$	-	$	0.1
Forward power contracts	MTM		7.5		(3.4)		(4.1)		-
FTRs	MTM		0.6		-		-		0.6
Heating oil futures	MTM		0.4		-		(0.4)		-
Natural gas	MTM		0.1		-		(0.1)		-
Long-term derivative positions (presented in Other deferred liabilities)
Forward power contracts	Cash Flow		0.6		(0.3)		(0.3)		-
Forward power contracts	MTM		0.9		(0.9)		-		-
Total liabilities		$	12.2	$	(6.6)	$	(4.9)	$	0.7

DP&L [Member]

Schedule of Notional Amounts of Outstanding Derivative Positions

Commodity	Accounting Treatment		Unit	Purchases (in thousands)		Sales (in thousands)		Net Purchases/ (Sales) (in thousands)
FTRs		Mark to Market	MWh		4.2		-		4.2
Heating oil futures		Mark to Market	Gallons		252.0		-		252.0
Forward power contracts		Cash Flow Hedge	MWh		843.5		(3,708.3)		(2,864.8)
Forward power contracts		Mark to Market	MWh		1,565.1		(4,911.8)		(3,346.7)

Commodity	Accounting Treatment		Unit	Purchases (in thousands)		Sales (in thousands)		Net Purchases/ (Sales) (in thousands)
FTRs		Mark to Market	MWh		10.5		-		10.5
Heating oil futures		Mark to Market	Gallons		378.0		-		378.0
Natural Gas		Mark to Market	Dths		200.0		-		200.0
Forward power contracts		Cash Flow Hedge	MWh		175.0		(2,991.0)		(2,816.0)
Forward power contracts		Mark to Market	MWh		1,725.2		(2,804.0)		(1,078.8)

Gains or Losses Recognized in AOCI for the Cash Flow Hedges

	Three months ended				Three months ended
	March 31, 2015				March 31, 2014
			Interest				Interest
$ in millions (net of tax)	Power		Rate Hedge		Power		Rate Hedge
Beginning accumulated derivative gain in AOCI	$	0.2	$	2.6	$	1.0	$	5.2
Net gains / (losses) associated with current period hedging transactions		0.1		-		(12.9)		-
Net gains / (losses) reclassified to earnings
Interest expense		-		(0.2)		-		(0.3)
Revenues		(0.2)		-		6.6		-
Purchased power		0.9		-		(0.6)		-
Ending accumulated derivative gain / (loss) in AOCI	$	1.0	$	2.4	$	(5.9)	$	4.9
Portion expected to be reclassified to earnings in the next twelve months (a)	$	1.1	$	1.0
Maximum length of time that we are hedging our exposure to variability in future cash flows related to forecasted transactions (in months)		21		0

(a)The actual amounts that we reclassify from AOCI to earnings related to power can differ from the estimate above due to market price changes.

Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location

For the three months ended March 31, 2015
$ in millions	Heating Oil		FTRs		Power		Natural Gas		Total
Change in unrealized gain / (loss)	$	0.1	$	0.9	$	(2.9)	$	0.1	$	(1.8)
Realized loss		(0.1)		(0.1)		(2.3)		(0.1)		(2.6)
Total	$	-	$	0.8	$	(5.2)	$	-	$	(4.4)
Recorded in Income Statement: gain / (loss)
Purchased power		-		0.8		(4.9)		-		(4.1)
Revenues		-		-		(0.3)		-		(0.3)
Total	$	-	$	0.8	$	(5.2)	$	-	$	(4.4)

For the three months ended March 31, 2014
$ in millions	Heating Oil		FTRs		Power		Total
Change in unrealized loss	$	(0.1)	$	(0.3)	$	(5.5)	$	(5.9)
Realized gain / (loss)		0.1		-		(1.4)		(1.3)
Total	$	-	$	(0.3)	$	(6.9)	$	(7.2)
Recorded in Income Statement: gain / (loss)
Revenues		-		-		0.8		0.8
Purchased power		-		(0.3)		(7.7)		(8.0)
Fuel		-		-		-		-
Total	$	-	$	(0.3)	$	(6.9)	$	(7.2)

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

Fair Values of Derivative Instruments
at March 31, 2015
				Gross Amounts Not Offset in the Condensed Balance Sheets
$ in millions	Hedging Designation	Gross Fair Value as presented in the Condensed Balance Sheets		Financial Instruments with Same Counterparty in Offsetting Position		Cash Collateral			Net Balance Fair Value
Assets
Short-term derivative positions (presented in Other current assets)
Forward power contracts	Cash Flow	$	5.2	$	(2.5)	$	-	$	2.7
Forward power contracts	MTM		5.0		(3.2)		-		1.8
FTRs	MTM		0.3		-		-		0.3
Long-term derivative positions (presented in Other deferred assets)
Forward power contracts	Cash Flow		3.8		(2.7)		-		1.1
Forward power contracts	MTM		6.5		(0.6)		-		5.9
Total assets		$	20.8	$	(9.0)	$	-	$	11.8
Liabilities
Short-term derivative positions (presented in Other current liabilities)
Forward power contracts	Cash Flow	$	4.1	$	(2.5)	$	(1.6)	$	-
Forward power contracts	MTM		13.1		(3.2)		(8.8)		1.1
Heating oil futures	MTM		0.3		-		(0.3)		-
FTRs	MTM		-		-		-		-
Long-term derivative positions (presented in Other deferred liabilities)
Forward power contracts	Cash Flow		2.7		(2.7)		-		-
Forward power contracts	MTM		0.7		(0.6)		-		0.1
Total liabilities		$	20.9	$	(9.0)	$	(10.7)	$	1.2

Fair Values of Derivative Instruments
at December 31, 2014
				Gross Amounts Not Offset in the Condensed Balance Sheets
$ in millions	Hedging Designation	Gross Fair Value as presented in the Condensed Balance Sheets		Financial Instruments with Same Counterparty in Offsetting Position		Cash Collateral			Net Balance Fair Value
Assets
Short-term derivative positions (presented in Other current assets)
Forward power contracts	Cash Flow	$	5.6	$	(2.0)	$	-	$	3.6
Forward power contracts	MTM		5.6		(3.4)		-		2.2
Long-term derivative positions (presented in Other deferred assets)
Forward power contracts	Cash Flow		0.3		(0.3)		-		-
Forward power contracts	MTM		3.6		(0.9)		-		2.7
Total assets		$	15.1	$	(6.6)	$	-	$	8.5
Liabilities
Short-term derivative positions (presented in Other current liabilities)
Forward power contracts	Cash Flow	$	2.1	$	(2.0)	$	-	$	0.1
Forward power contracts	MTM		7.5		(3.4)		(4.1)		-
FTRs	MTM		0.6		-		-		0.6
Heating oil futures	MTM		0.4		-		(0.4)		-
Natural gas futures	MTM		0.1		-		(0.1)		-
Long-term derivative positions (presented in Other deferred liabilities)
Forward power contracts	Cash Flow		0.6		(0.3)		(0.3)		-
Forward power contracts	MTM		1.0		(0.9)		-		0.1
Total liabilities		$	12.3	$	(6.6)	$	(4.9)	$	0.8