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Revenue (Tables)
 9 Months Ended
Sep. 30, 2021
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, 2021 and 2020:
$ in millionsUtilityOtherAdjustments and EliminationsTotal
Three Months Ended September 30, 2021
Retail revenue
Retail revenue from contracts with customers
Residential revenue$103.3 $— $— $103.3 
Commercial revenue35.0 — — 35.0 
Industrial revenue16.0 — — 16.0 
Governmental revenue7.0 — — 7.0 
Other (a)
2.9 — — 2.9 
Total retail revenue from contracts with customers164.2 — — 164.2 
Wholesale revenue
Wholesale revenue from contracts with customers6.8 — (0.2)6.6 
RTO ancillary revenue12.5 — — 12.5 
Capacity revenue1.8 — — 1.8 
Miscellaneous revenue
Miscellaneous revenue from contracts with customers (c)
— 2.4 — 2.4 
Other miscellaneous revenue0.8 0.7 (0.8)0.7 
Total revenues$186.1 $3.1 $(1.0)$188.2 
$ 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 
Nine months ended September 30, 2021
Retail revenue
Retail revenue from contracts with customers
Residential revenue$279.3 $— $— $279.3 
Commercial revenue90.5 — — 90.5 
Industrial revenue42.4 — — 42.4 
Governmental revenue19.9 — — 19.9 
Other (a)
9.4 — — 9.4 
Total retail revenue from contracts with customers441.5 — — 441.5 
Wholesale revenue
Wholesale revenue from contracts with customers15.4 — (0.6)14.8 
RTO ancillary revenue39.4 0.1 — 39.5 
Capacity revenue4.0 — — 4.0 
Miscellaneous revenue
Miscellaneous revenue from contracts with customers (c)
— 7.2 — 7.2 
Other miscellaneous revenue4.5 2.6 (2.6)4.5 
Total revenues$504.8 $9.9 $(3.2)$511.5 
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 
(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 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, 2021 and 2020:
Three months endedNine months ended
September 30,September 30,
$ in millions2021202020212020
Retail revenue
Retail revenue from contracts with customers
Residential revenue$103.3 $99.3 $279.3 $279.9 
Commercial revenue35.0 32.2 90.5 87.6 
Industrial revenue16.0 14.5 42.4 38.2 
Governmental revenue7.0 9.9 19.9 27.7 
Other (a)
2.9 3.7 9.4 9.7 
Total retail revenue from contracts with customers164.2 159.6 441.5 443.1 
Other retail revenue (b)
— 0.1 — 8.8 
Wholesale revenue
Wholesale revenue from contracts with customers6.8 3.2 15.4 7.7 
RTO ancillary revenue12.5 11.5 39.4 32.3 
Capacity revenue1.8 0.9 4.0 3.2 
Miscellaneous revenue0.8 1.7 4.5 4.0 
Total revenues$186.1 $177.0 $504.8 $499.1 

(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 includes alternative revenue programs not accounted for under FASC 606.