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Revenue (Tables)
 9 Months Ended
Sep. 30, 2023
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, 2023 and 2022:
$ in millionsUtilityOtherAdjustments and EliminationsTotal
Three Months Ended September 30, 2023
Retail revenue
Retail revenue from contracts with customers
Residential revenue$127.8 $— $— $127.8 
Commercial revenue42.7 — — 42.7 
Industrial revenue16.5 — — 16.5 
Governmental revenue6.8 — — 6.8 
Other (a)
3.5 — — 3.5 
Total retail revenue from contracts with customers197.3 — — 197.3 
Other retail revenue (b)
(0.2)— — (0.2)
Wholesale revenue
Wholesale revenue from contracts with customers4.2 — (0.2)4.0 
RTO ancillary revenue21.4 0.1 — 21.5 
Capacity revenue0.7 — — 0.7 
Miscellaneous revenue
Miscellaneous revenue from contracts with customers (c)
— 2.3 — 2.3 
Other miscellaneous revenue(1.4)1.5 (1.5)(1.4)
Total revenue$222.0 $3.9 $(1.7)$224.2 
Three Months Ended September 30, 2022
Retail revenue
Retail revenue from contracts with customers
Residential revenue$147.0 $— $— $147.0 
Commercial revenue50.5 — — 50.5 
Industrial revenue20.6 — — 20.6 
Governmental revenue6.2 — — 6.2 
Other (a)
3.0 — — 3.0 
Total retail revenue from contracts with customers227.3 — — 227.3 
Wholesale revenue
Wholesale revenue from contracts with customers13.4 — (0.2)13.2 
RTO ancillary revenue16.2 — — 16.2 
Capacity revenue0.5 — — 0.5 
Miscellaneous revenue
Miscellaneous revenue from contracts with customers (c)
— 2.4 — 2.4 
Other miscellaneous revenue2.5 0.8 (0.8)2.5 
Total revenue$259.9 $3.2 $(1.0)$262.1 
$ in millionsUtilityOtherAdjustments and EliminationsTotal
Nine months ended September 30, 2023
Retail revenue
Retail revenue from contracts with customers
Residential revenue$377.9 $— $— $377.9 
Commercial revenue124.8 — — 124.8 
Industrial revenue50.4 — — 50.4 
Governmental revenue18.7 — — 18.7 
Other (a)
9.9 — — 9.9 
Total retail revenue from contracts with customers581.7 — — 581.7 
Other retail revenue (b)
(0.2)— — (0.2)
Wholesale revenue
Wholesale revenue from contracts with customers11.3 — (0.5)10.8 
RTO ancillary revenue65.7 0.1 — 65.8 
Capacity revenue3.2 — — 3.2 
Miscellaneous revenue
Miscellaneous revenue from contracts with customers (c)
— 7.2 — 7.2 
Other miscellaneous revenue(2.2)3.2 (3.2)(2.2)
Total revenue$659.5 $10.5 $(3.7)$666.3 
Nine months ended September 30, 2022
Retail revenue
Retail revenue from contracts with customers
Residential revenue$350.6 $— $— $350.6 
Commercial revenue123.5 — — 123.5 
Industrial revenue55.4 — — 55.4 
Governmental revenue18.2 — — 18.2 
Other (a)
9.1 — — 9.1 
Total retail revenue from contracts with customers556.8 — — 556.8 
Wholesale revenue
Wholesale revenue from contracts with customers32.1 — (0.6)31.5 
RTO ancillary revenue46.2 0.1 — 46.3 
Capacity revenue3.8 — — 3.8 
Miscellaneous revenue
Miscellaneous revenue from contracts with customers (c)
— 7.2 — 7.2 
Other miscellaneous revenue6.7 2.6 (2.6)6.7 
Total revenue$645.6 $9.9 $(3.2)$652.3 

(a)    "Other" primarily includes operation and maintenance service revenue, billing service fees from CRES providers and other miscellaneous retail revenue from contracts with customers.
(b)    Other retail revenue primarily includes alternative revenue programs not accounted for under ASC 606 - Revenue Recognition ("ASC 606").
(c)    Miscellaneous revenue from contracts with customers primarily includes revenue 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, 2023 and 2022:
Three months endedNine months ended
September 30,September 30,
$ in millions2023202220232022
Retail revenue
Retail revenue from contracts with customers
Residential revenue$127.8 $147.0 $377.9 $350.6 
Commercial revenue42.7 50.5 124.8 123.5 
Industrial revenue16.5 20.6 50.4 55.4 
Governmental revenue6.8 6.2 18.7 18.2 
Other (a)
3.5 3.0 9.9 9.1 
Total retail revenue from contracts with customers197.3 227.3 581.7 556.8 
Other retail revenue (b)
(0.2)— (0.2)— 
Wholesale revenue
Wholesale revenue from contracts with customers4.2 13.4 11.3 32.1 
RTO ancillary revenue21.4 16.2 65.7 46.2 
Capacity revenue0.7 0.5 3.2 3.8 
Miscellaneous revenue(1.4)2.5 (2.2)6.7 
Total revenue$222.0 $259.9 $659.5 $645.6 

(a)    "Other" primarily includes operation and maintenance service revenue, billing service fees from CRES providers and other miscellaneous retail revenue from contracts with customers.
(b)    Other retail revenue primarily includes alternative revenue programs not accounted for under ASC 606 - Revenue Recognition ("ASC 606").