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Revenue (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2021 and 2020:
$ in millionsUtilityOtherAdjustments and EliminationsTotal
Three Months Ended June 30, 2021
Retail revenue
Retail revenue from contracts with customers
Residential revenue$77.7 $— $— $77.7 
Commercial revenue28.2 — — 28.2 
Industrial revenue14.1 — — 14.1 
Governmental revenue5.5 — — 5.5 
Other (a)
2.8 — — 2.8 
Total retail revenue from contracts with customers128.3 — — 128.3 
Wholesale revenue
Wholesale revenue from contracts with customers3.6 — (0.2)3.4 
RTO ancillary revenue12.1 — — 12.1 
Capacity revenue1.3 — — 1.3 
Miscellaneous revenue
Miscellaneous revenue from contracts with customers (c)
— 2.3 — 2.3 
Other miscellaneous revenue0.6 1.0 (0.9)0.7 
Total revenues$145.9 $3.3 $(1.1)$148.1 
$ in millionsUtilityOtherAdjustments and EliminationsTotal
Three Months Ended June 30, 2020
Retail revenue
Retail revenue from contracts with customers
Residential revenue$83.7 $— $— $83.7 
Commercial revenue26.5 — — 26.5 
Industrial revenue11.9 — — 11.9 
Governmental revenue8.6 — — 8.6 
Other (a)
2.6 — — 2.6 
Total retail revenue from contracts with customers133.3 — — 133.3 
Other retail revenue (b)
5.4 — — 5.4 
Wholesale revenue
Wholesale revenue from contracts with customers1.8 — (0.3)1.5 
RTO ancillary revenue10.1 0.1 — 10.2 
Capacity revenue1.1 — — 1.1 
Miscellaneous revenue
Miscellaneous revenue from contracts with customers (c)
— 2.2 — 2.2 
Other miscellaneous revenue1.4 0.9 (0.9)1.4 
Total revenues$153.1 $3.2 $(1.2)$155.1 
Six months ended June 30, 2021
Retail revenue
Retail revenue from contracts with customers
Residential revenue$176.0 $— $— $176.0 
Commercial revenue55.5 — — 55.5 
Industrial revenue26.4 — — 26.4 
Governmental revenue12.9 — — 12.9 
Other (a)
6.5 — — 6.5 
Total retail revenue from contracts with customers277.3 — — 277.3 
Wholesale revenue
Wholesale revenue from contracts with customers8.6 — (0.4)8.2 
RTO ancillary revenue26.9 0.1 — 27.0 
Capacity revenue2.2 — — 2.2 
Miscellaneous revenue
Miscellaneous revenue from contracts with customers (c)
— 4.8 — 4.8 
Other miscellaneous revenue3.7 1.9 (1.8)3.8 
Total revenues$318.7 $6.8 $(2.2)$323.3 
Six months ended June 30, 2020
Retail revenue
Retail revenue from contracts with customers
Residential revenue$180.6 $— $— $180.6 
Commercial revenue55.4 — — 55.4 
Industrial revenue23.7 — — 23.7 
Governmental revenue17.8 — — 17.8 
Other (a)
6.0 — — 6.0 
Total retail revenue from contracts with customers283.5 — — 283.5 
Other retail revenue (b)
8.7 — — 8.7 
Wholesale revenue
Wholesale revenue from contracts with customers4.5 — (0.5)4.0 
RTO ancillary revenue20.8 0.1 — 20.9 
Capacity revenue2.3 — — 2.3 
Miscellaneous revenue
Miscellaneous revenue from contracts with customers (c)
— 4.6 — 4.6 
Other miscellaneous revenue2.3 1.7 (1.7)2.3 
Total revenues$322.1 $6.4 $(2.2)$326.3 
(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 six months ended June 30, 2021 and 2020:
Three months endedSix months ended
June 30,June 30,
$ in millions2021202020212020
Retail revenue
Retail revenue from contracts with customers
Residential revenue$77.7 $83.7 $176.0 $180.6 
Commercial revenue28.2 26.5 55.5 55.4 
Industrial revenue14.1 11.9 26.4 23.7 
Governmental revenue5.5 8.6 12.9 17.8 
Other (a)
2.8 2.6 6.5 6.0 
Total retail revenue from contracts with customers128.3 133.3 277.3 283.5 
Other retail revenue (b)
— 5.4 — 8.7 
Wholesale revenue
Wholesale revenue from contracts with customers3.6 1.8 8.6 4.5 
RTO ancillary revenue12.1 10.1 26.9 20.8 
Capacity revenue1.3 1.1 2.2 2.3 
Miscellaneous revenue0.6 1.4 3.7 2.3 
Total revenues$145.9 $153.1 $318.7 $322.1 

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