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Derivative Instruments and Hedging Activities (Tables)
 9 Months Ended
Sep. 30, 2020
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 AOCL for the cash flow hedges for the three and nine months ended September 30, 2020 and 2019:
Three months ended
September 30, 2020September 30, 2019
InterestInterest
$ in millions (net of tax)Rate HedgeRate HedgePower
Beginning accumulated derivative gains in AOCL$13.9 $15.3 $0.4 
Net gains / (losses) associated with current period hedging transactions0.1 (0.2)— 
Net gains reclassified to earnings
Interest expense(0.3)(0.4)— 
Income from discontinued operations— — (0.4)
Ending accumulated derivative gains in AOCL$13.7 $14.7 $— 
Nine months ended
September 30, 2020September 30, 2019
InterestInterest
$ in millions (net of tax)Rate HedgeRate HedgePower
Beginning accumulated derivative gains in AOCL$14.5 $16.6 $0.4 
Net losses associated with current period hedging transactions— (1.0)— 
Net gains reclassified to earnings
Interest expense(0.8)(0.9)— 
Income from discontinued operations— — (0.4)
Ending accumulated derivative gains in AOCL$13.7 $14.7 $— 
Portion expected to be reclassified to earnings in the next twelve months$(0.1)
Maximum length of time that we are hedging our exposure to variability in future cash flows related to forecasted transactions (in months)0

Financial Statement Effect
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location
DPL has elected not to offset derivative assets and liabilities and not to offset net derivative positions against the right to reclaim cash collateral pledged (an asset) or the obligation to return cash collateral received (a liability) under derivative agreements. The fair value derivative position of DPL's interest rate swaps are as follows:
$ in millions (net of tax)Hedging DesignationBalance sheet classificationSeptember 30, 2020December 31, 2019
Interest rate swapCash Flow HedgePrepayments and other current assets$— $0.1 
Subsidiaries [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 AOCL for the cash flow hedges for the three and nine months ended September 30, 2020 and 2019:
Three months ended
September 30, 2020September 30, 2019
InterestInterest
$ in millions (net of tax)Rate HedgeRate Hedge
Beginning accumulated derivative losses in AOCL$(0.7)$(0.3)
Net gains / (losses) associated with current period hedging transactions0.2 (0.1)
Net gains reclassified to earnings
Interest expense(0.1)— 
Ending accumulated derivative losses in AOCL$(0.6)$(0.4)
Nine months ended
September 30, 2020September 30, 2019
InterestInterest
$ in millions (net of tax)Rate HedgeRate Hedge
Beginning accumulated derivative gains / (losses) in AOCL$(0.4)$0.6 
Net gains / (losses) associated with current period hedging transactions0.1 (0.9)
Net gains reclassified to earnings
Interest expense(0.3)(0.1)
Ending accumulated derivative losses in AOCL$(0.6)$(0.4)
Portion expected to be reclassified to earnings in the next twelve months$0.6 
Maximum length of time that we are hedging our exposure to variability in future cash flows related to forecasted transactions (in months)0
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location
DP&L has elected not to offset derivative assets and liabilities and not to offset net derivative positions against the right to reclaim cash collateral pledged (an asset) or the obligation to return cash collateral received (a liability) under derivative agreements. The fair value derivative position of DP&L's interest rate swaps are as follows:
$ in millions (net of tax)Hedging DesignationBalance sheet classificationSeptember 30, 2020December 31, 2019
Interest rate swapCash Flow HedgePrepayments and other current assets$— $0.1