Derivative Instruments and Hedging Activities (Tables)

6 Months Ended

Jun. 30, 2025

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 recognized in AOCI for the cash flow hedges for the three and six months ended June 30, 2025 and 2024:

	Three months ended				Six months ended
	June 30,				June 30,
	2025		2024		2025		2024
	Interest		Interest		Interest		Interest
$ in millions (net of tax)	Rate Hedge		Rate Hedge		Rate Hedge		Rate Hedge
Beginning accumulated derivative gains in AOCI	$	10.2	$	11.0	$	10.4	$	11.2
Net gains reclassified to earnings
Interest expense	(0.2)		(0.3)		(0.4)		(0.5)
DPL LLC conversion tax transfer to Parent (Note 1 and Note 6)	7.9		—		7.9		—
Ending accumulated derivative gains in AOCI	$	17.9	$	10.7	$	17.9	$	10.7
Portion expected to be reclassified to earnings in the next twelve months					$	(1.0)