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Revenue (Tables)
 9 Months Ended
Sep. 30, 2020
Disaggregation of Revenue [Table Text Block]
The following table presents our revenue from contracts with customers and other revenue by segment for the three and nine months ended September 30, 2020 and 2019:
$ in millionsUtilityOtherAdjustments and EliminationsTotal
Three Months Ended September 30, 2020
Retail revenue
Retail revenue from contracts with customers
Residential revenue$99.3 $— $— $99.3 
Commercial revenue32.2 — — 32.2 
Industrial revenue14.5 — — 14.5 
Governmental revenue9.9 — — 9.9 
Other (a)
3.7 — — 3.7 
Total retail revenue from contracts with customers159.6 — — 159.6 
Other retail revenue (b)
0.1 — — 0.1 
Wholesale revenue
Wholesale revenue from contracts with customers3.2 — (0.2)3.0 
RTO ancillary revenue11.5 (0.1)— 11.4 
Capacity revenue0.9 — — 0.9 
Miscellaneous revenue
Miscellaneous revenue from contracts with customers (c)
— 2.1 — 2.1 
Other miscellaneous revenue1.7 1.0 (1.0)1.7 
Total revenues$177.0 $3.0 $(1.2)$178.8 
$ in millionsUtilityOtherAdjustments and EliminationsTotal
Three Months Ended September 30, 2019
Retail revenue
Retail revenue from contracts with customers
Residential revenue$107.5 $— $— $107.5 
Commercial revenue34.8 — — 34.8 
Industrial revenue13.7 — — 13.7 
Governmental revenue11.4 — — 11.4 
Other (a)
3.1 — — 3.1 
Total retail revenue from contracts with customers170.5 — — 170.5 
Other retail revenue (b)
3.8 — — 3.8 
Wholesale revenue
Wholesale revenue from contracts with customers4.4 — (0.2)4.2 
RTO ancillary revenue11.0 0.1 — 11.1 
Capacity revenue1.1 — — 1.1 
Miscellaneous revenue
Miscellaneous revenue from contracts with customers (c)
— 2.0 — 2.0 
Other miscellaneous revenue0.3 0.7 (0.8)0.2 
Total revenues$191.1 $2.8 $(1.0)$192.9 
Nine months ended September 30, 2020
Retail revenue
Retail revenue from contracts with customers
Residential revenue$279.9 $— $— $279.9 
Commercial revenue87.6 — — 87.6 
Industrial revenue38.2 — — 38.2 
Governmental revenue27.7 — — 27.7 
Other (a)
9.7 — — 9.7 
Total retail revenue from contracts with customers443.1 — — 443.1 
Other retail revenue (b)
8.8 — — 8.8 
Wholesale revenue
Wholesale revenue from contracts with customers7.7 — (0.7)7.0 
RTO ancillary revenue32.3 — — 32.3 
Capacity revenue3.2 — — 3.2 
Miscellaneous revenue
Miscellaneous revenue from contracts with customers (c)
— 6.7 — 6.7 
Other miscellaneous revenue4.0 2.7 (2.7)4.0 
Total revenues$499.1 $9.4 $(3.4)$505.1 
Nine months ended September 30, 2019
Retail revenue
Retail revenue from contracts with customers
Residential revenue$313.9 $— $— $313.9 
Commercial revenue103.7 — — 103.7 
Industrial revenue43.5 — — 43.5 
Governmental revenue33.3 — — 33.3 
Other (a)
9.4 — — 9.4 
Total retail revenue from contracts with customers503.8 — — 503.8 
Other retail revenue (b)
14.9 — — 14.9 
Wholesale revenue
Wholesale revenue from contracts with customers12.8 — (0.8)12.0 
RTO ancillary revenue32.8 0.1 — 32.9 
Capacity revenue5.0 — — 5.0 
Miscellaneous revenue
Miscellaneous revenue from contracts with customers (c)
— 7.1 — 7.1 
Other miscellaneous revenue0.9 2.3 (2.4)0.8 
Total revenues$570.2 $9.5 $(3.2)$576.5 
(a)    "Other" primarily includes Wright-Patterson Air Force Base revenues, billing service fees from CRES providers and other miscellaneous retail revenues from contracts with customers.
(b)    Other retail revenue primarily includes alternative revenue programs not accounted for under FASC 606.
(c)    Miscellaneous revenue from contracts with customers primarily includes revenues for various services provided by Miami Valley Lighting.
Subsidiaries [Member]  
Disaggregation of Revenue [Table Text Block]
The following table presents our revenue from contracts with customers and other revenue for the three and nine months ended September 30, 2020 and 2019:
Three months endedNine months ended
September 30,September 30,
$ in millions2020201920202019
Retail revenue
Retail revenue from contracts with customers
Residential revenue$99.3 $107.5 $279.9 $313.9 
Commercial revenue32.2 34.8 87.6 103.7 
Industrial revenue14.5 13.7 38.2 43.5 
Governmental revenue9.9 11.4 27.7 33.3 
Other (a)
3.7 3.1 9.7 9.4 
Total retail revenue from contracts with customers159.6 170.5 443.1 503.8 
Other retail revenue (b)
0.1 3.8 8.8 14.9 
Wholesale revenue
Wholesale revenue from contracts with customers3.2 4.4 7.7 12.8 
RTO ancillary revenue11.5 11.0 32.3 32.8 
Capacity revenue0.9 1.1 3.2 5.0 
Miscellaneous revenue1.7 0.3 4.0 0.9 
Total revenues$177.0 $191.1 $499.1 $570.2 

(a)    "Other" primarily includes Wright-Patterson Air Force Base revenues, billing service fees from CRES providers and other miscellaneous retail revenues from contracts with customers.
(b)    Other retail revenue primarily includes alternative revenue programs not accounted for under FASC 606.