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Revenue (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2020 and 2019:
$ 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  
$ in millionsUtilityOtherAdjustments and EliminationsTotal
Three Months Ended June 30, 2019
Retail revenue
Retail revenue from contracts with customers
Residential revenue$87.4  $—  $—  $87.4  
Commercial revenue33.8  —  —  33.8  
Industrial revenue15.4  —  —  15.4  
Governmental revenue10.9  —  0.3  11.2  
Other (a)
3.1  —  —  3.1  
Total retail revenue from contracts with customers150.6  —  0.3  150.9  
Other retail revenue (b)
10.4  —  —  10.4  
Wholesale revenue
Wholesale revenue from contracts with customers3.4  —  (0.6) 2.8  
RTO ancillary revenue10.9  —  —  10.9  
Capacity revenue1.8  —  —  1.8  
Miscellaneous revenue
Miscellaneous revenue from contracts with customers (c)
—  2.2  —  2.2  
Other miscellaneous revenue0.6  0.8  (0.8) 0.6  
Total revenues$177.7  $3.0  $(1.1) $179.6  
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  
Six months ended June 30, 2019
Retail revenue
Retail revenue from contracts with customers
Residential revenue$206.4  $—  $—  $206.4  
Commercial revenue68.9  —  —  68.9  
Industrial revenue29.8  —  —  29.8  
Governmental revenue21.9  —  —  21.9  
Other (a)
6.3  —  —  6.3  
Total retail revenue from contracts with customers333.3  —  —  333.3  
Other retail revenue (b)
11.1  —  —  11.1  
Wholesale revenue
Wholesale revenue from contracts with customers8.4  —  (0.6) 7.8  
RTO ancillary revenue21.8  —  —  21.8  
Capacity revenue3.9  —  —  3.9  
Miscellaneous revenue
Miscellaneous revenue from contracts with customers (c)
—  5.1  —  5.1  
Other miscellaneous revenue0.6  1.6  (1.6) 0.6  
Total revenues$379.1  $6.7  $(2.2) $383.6  
(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, 2020 and 2019:
Three months endedSix months ended
June 30,June 30,
$ in millions2020201920202019
Retail revenue
Retail revenue from contracts with customers
Residential revenue$83.7  $87.4  $180.6  $206.4  
Commercial revenue26.5  33.8  55.4  68.9  
Industrial revenue11.9  15.4  23.7  29.8  
Governmental revenue8.6  10.9  17.8  21.9  
Other (a)
2.6  3.1  6.0  6.3  
Total retail revenue from contracts with customers133.3  150.6  283.5  333.3  
Other retail revenue (b)
5.4  10.4  8.7  11.1  
Wholesale revenue
Wholesale revenue from contracts with customers1.8  3.4  4.5  8.4  
RTO ancillary revenue10.1  10.9  20.8  21.8  
Capacity revenue1.1  1.8  2.3  3.9  
Miscellaneous revenue1.4  0.6  2.3  0.6  
Total revenues$153.1  $177.7  $322.1  $379.1  

(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.