Derivative Instruments and Hedging Activities (Tables)

6 Months Ended

Jun. 30, 2018

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Gains or Losses Recognized in AOCI for the Cash Flow Hedges

The following tables provide information concerning gains or losses recognized in AOCI for the cash flow hedges for the three and six months ended June 30, 2018 and 2017:

	Three months ended						Three months ended
	June 30, 2018						June 30, 2017
				Interest						Interest
$ in millions (net of tax)	Power			Rate Hedge			Power			Rate Hedge
Beginning accumulated derivative gains / (losses) in AOCI	$	(0.1	)	$	18.0		$	1.8		$	17.5
Net gains / (losses) associated with current period hedging transactions	—			(0.6		)	1.2			(0.1		)
Net losses reclassified to earnings
Interest expense	—			—			—			(0.2		)
Loss from discontinued operations	0.1			—			—			—
Ending accumulated derivative gains in AOCI	$	—		$	17.4		$	3.0		$	17.2
	Six months ended						Six months ended
	June 30, 2018						June 30, 2017
				Interest						Interest
$ in millions (net of tax)	Power			Rate Hedge			Power			Rate Hedge
Beginning accumulated derivative gains / (losses) in AOCI	$	(2.8	)	$	17.5		$	(4.3	)	$	17.4
Net gains associated with current period hedging transactions	—			0.3			6.0			0.1
Net gains / (losses) reclassified to earnings
Interest expense	—			(0.4		)	—			(0.3		)
Loss from discontinued operations	2.8			—			1.3			—
Ending accumulated derivative gains in AOCI	$	—		$	17.4		$	3.0		$	17.2
Portion expected to be reclassified to earnings in the next twelve months				$	(0.4	)
Maximum length of time that we are hedging our exposure to variability in future cash flows related to forecasted transactions (in months)				26

Net gains or losses associated with the ineffective portion of the hedging transactions were immaterial in the periods presented.

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

Fair Values of Derivative Instruments
at June 30, 2018
				Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets
$ in millions	Hedging Designation	Gross Fair Value as presented in the Consolidated Balance Sheets (a)		Financial Instruments with Same Counterparty in Offsetting Position		Cash Collateral		Net Fair Value
Assets
Short-term derivative positions (presented in Other prepayments and current assets)
Interest rate swap	Designated	$	2.2	$	—	$	—	$	2.2
Total assets		$	2.2	$	—	$	—	$	2.2

(a) includes credit valuation adjustment

Fair Values of Derivative Instruments
at December 31, 2017
				Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets
$ in millions	Hedging Designation	Gross Fair Value as presented in the Consolidated Balance Sheets (a)		Financial Instruments with Same Counterparty in Offsetting Position		Cash Collateral		Net Fair Value
Assets
Long-term derivative positions (presented in Other deferred assets)
Interest rate swaps	Designated	$	1.8	$	—	$	—	$	1.8
Total assets		$	1.8	$	—	$	—	$	1.8

(a) includes credit valuation adjustment

THE DAYTON POWER AND LIGHT COMPANY [Member]

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Gains or Losses Recognized in AOCI for the Cash Flow Hedges

The following tables provide information concerning gains or losses recognized in AOCI for the cash flow hedges for the three and six months ended June 30, 2018 and 2017:

	Three months ended			Three months ended
	June 30, 2018			June 30, 2017
	Interest						Interest
$ in millions (net of tax)	Rate Hedge			Power			Rate Hedge
Beginning accumulated derivative gains in AOCI	$	1.6		$	1.8		$	1.7
Net gains / (losses) associated with current period hedging transactions	0.2			1.2			(0.1		)
Net losses reclassified to earnings
Interest expense	(0.2		)	—			(0.2		)
Ending accumulated derivative gains in AOCI	$	1.6		$	3.0		$	1.4
	Six months ended			Six months ended
	June 30, 2018			June 30, 2017
	Interest						Interest
$ in millions (net of tax)	Rate Hedge			Power			Rate Hedge
Beginning accumulated derivative gains / (losses) in AOCI	$	1.4		$	(4.3	)	$	1.6
Net gains associated with current period hedging transactions	0.7			6.0			0.2
Net gains / (losses) reclassified to earnings
Interest expense	(0.5		)	—			(0.4		)
Loss from discontinued operations	—			1.3			—
Ending accumulated derivative gains in AOCI	$	1.6		$	3.0		$	1.4
Portion expected to be reclassified to earnings in the next twelve months	$	(0.5	)
Maximum length of time that we are hedging our exposure to variability in future cash flows related to forecasted transactions (in months)	26

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

	Hedging Designation	Balance sheet classification	June 30, 2018		December 31, 2017
Interest Rate Hedges in an Asset Position	Cash Flow Hedge	Other Deferred Assets
Gross Fair Value as presented in the Balance Sheets			$	2.2	$	1.8

Any ineffectiveness on the interest rate hedges and the monthly settlement of the interest rate hedges is recorded in interest expense within the Condensed Statements of Operations.