Business Segments Business Segments (Tables)

12 Months Ended

Dec. 31, 2025

Segment Reporting Information [Line Items]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

The following tables present financial information for DPL’s reportable business segment:

$ in millions	Utility		Other		Adjustments and Eliminations		DPL Consolidated
Year ended December 31, 2025
Revenue from external customers	$	1,060.7	$	9.9	$	—	$	1,070.6
Intersegment revenue	1.1		4.6		(5.7)		—
Total revenue	1,061.8		14.5		(5.7)		1,070.6
Purchased power	393.4		2.0		(1.1)		394.3
Operation and maintenance	278.1		7.6		(4.6)		281.1
Depreciation and amortization	117.5		1.9		—		119.4
Taxes other than income taxes	137.0		0.3		—		137.3
Interest expense	57.8		24.6		—		82.4
Other segment items (a)	3.3		(3.1)		—		0.2
Income / (loss) before income tax	74.7		(18.8)		—		55.9
Income tax expense / (benefit)	24.1		(1.2)		—		22.9
Net income / (loss)	$	50.6	$	(17.6)	$	—	$	33.0
Cash capital expenditures	$	385.7	$	1.5	$	—	$	387.2

(a)    Other segment items primarily includes AFUDC equity and other miscellaneous gains and losses in Other income / (expense), net.

$ in millions	Utility		Other		Adjustments and Eliminations		DPL Consolidated
Year ended December 31, 2024
Revenue from external customers	$	866.7	$	9.8	$	—	$	876.5
Intersegment revenue	0.9		4.9		(5.8)		—
Total revenue	867.6		14.7		(5.8)		876.5
Purchased power	315.4		1.9		(0.9)		316.4
Operation and maintenance	258.3		5.7		(4.9)		259.1
Depreciation and amortization	93.4		1.8		—		95.2
Taxes other than income taxes	113.4		0.1		—		113.5
Interest expense	48.2		36.6		0.2		85.0
Other segment items (a)	(1.2)		(2.1)		(0.2)		(3.5)
Income / (loss) before income tax	40.1		(29.3)		—		10.8
Income tax expense / (benefit)	3.2		(6.2)		—		(3.0)
Net income / (loss)	$	36.9	$	(23.1)	$	—	$	13.8
Cash capital expenditures	$	547.9	$	1.6	$	—	$	549.5

(a)    Other segment items primarily includes AFUDC equity and other miscellaneous gains and losses in Other income / (expense), net.

$ in millions	Utility		Other		Adjustments and Eliminations		DPL Consolidated
Year ended December 31, 2023
Revenue from external customers	$	851.3	$	9.7	$	—	$	861.0
Intersegment revenue	0.7		4.4		(5.1)		—
Total revenue	852.0		14.1		(5.1)		861.0
Purchased power	346.0		1.6		(0.7)		346.9
Operation and maintenance	229.8		6.7		(4.4)		232.1
Depreciation and amortization	80.7		1.4		—		82.1
Taxes other than income taxes	100.6		0.2		—		100.8
Interest expense	25.8		39.2		(1.4)		63.6
Other segment items (a)	(5.8)		(2.4)		1.4		(6.8)
Income / (loss) before income tax	74.9		(32.6)		—		42.3
Income tax expense / (benefit)	13.5		(6.9)		—		6.6
Net income / (loss)	$	61.4	$	(25.7)	$	—	$	35.7
Cash capital expenditures	$	384.3	$	3.6	$	—	$	387.9

(a)    Other segment items primarily includes AFUDC equity and other miscellaneous gains and losses in Other income / (expense), net.

Total Assets	December 31, 2025		December 31, 2024		December 31, 2023
Utility	$	3,730.8	$	3,355.2	$	2,871.0
All Other (a)	50.2		62.2		35.2
DPL Consolidated	$	3,781.0	$	3,417.4	$	2,906.2

(a)    "All Other" includes Eliminations for all periods presented.