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Business Segment Information
 3 Months Ended
Mar. 31, 2023
Segment Reporting [Abstract]  
Business Segment Information
Our operations are divided into two primary reportable segments, the Gas Distribution Operations and the Electric Operations segments. The remainder of our operations, which are not significant enough on a stand-alone basis to warrant treatment as an operating segment, are presented as "Corporate and Other" and primarily are comprised of interest expense on holding company debt, and unallocated corporate costs and activities. Refer to Note 3, "Revenue Recognition," for additional information on our segments and their sources of revenues. The following table provides information about our reportable segments. We use operating income as our primary measurement for each of the reported segments and make decisions on finance, dividends, and taxes at the corporate level on a consolidated basis. Segment revenues include intersegment sales to affiliated subsidiaries, which are eliminated in consolidation. Affiliated sales are recognized on the basis of prevailing market, regulated prices or at levels provided for under contractual agreements. Operating income is derived from revenues and expenses directly associated with each segment.
 Three Months Ended
March 31,
(in millions)20232022
Operating Revenues
Gas Distribution Operations
Unaffiliated$1,501.3 $1,436.7 
Intersegment3.1 3.1 
Total1,504.4 1,439.8 
Electric Operations
Unaffiliated464.5 430.1 
Intersegment0.2 0.2 
Total464.7 430.3 
Corporate and Other
Unaffiliated0.2 6.5 
Intersegment116.7 113.5 
Total116.9 120.0 
Eliminations(120.0)(116.8)
Consolidated Operating Revenues$1,966.0 $1,873.3 
Operating Income (Loss)  
Gas Distribution Operations$446.9 $510.8 
Electric Operations81.9 99.2 
Corporate and Other2.2 (9.7)
Consolidated Operating Income$531.0 $600.3