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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disaggregation of Revenue [Line Items]    
Customer revenues $ 1,896.1 $ 1,840.3
Other revenues 69.9 33.0
Total Operating Revenues 1,966.0 1,873.3
Revenues 1,966.0 1,873.3
Gas Distribution Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 1,455.1 1,433.9
Other revenues 46.2 2.8
Revenues 1,504.4 1,439.8
Gas Distribution Operations | Unaffiliated    
Disaggregation of Revenue [Line Items]    
Revenues 1,501.3 1,436.7
Electric Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 441.0 406.4
Other revenues 23.5 23.7
Revenues 464.7 430.3
Electric Operations | Unaffiliated    
Disaggregation of Revenue [Line Items]    
Revenues 464.5 430.1
Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues 0.0 0.0
Other revenues 0.2 6.5
Revenues 116.9 120.0
Corporate and Other | Unaffiliated    
Disaggregation of Revenue [Line Items]    
Revenues 0.2 6.5
Residential    
Disaggregation of Revenue [Line Items]    
Customer revenues 1,137.4 1,115.4
Residential | Gas Distribution Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 987.0 976.9
Residential | Electric Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 150.4 138.5
Residential | Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues 0.0 0.0
Commercial    
Disaggregation of Revenue [Line Items]    
Customer revenues 511.5 491.0
Commercial | Gas Distribution Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 360.6 356.5
Commercial | Electric Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 150.9 134.5
Commercial | Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues 0.0 0.0
Industrial    
Disaggregation of Revenue [Line Items]    
Customer revenues 206.1 197.6
Industrial | Gas Distribution Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 71.9 67.8
Industrial | Electric Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 134.2 129.8
Industrial | Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues 0.0 0.0
Off-system    
Disaggregation of Revenue [Line Items]    
Customer revenues 17.2 18.7
Off-system | Gas Distribution Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 17.2 18.7
Off-system | Electric Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 0.0 0.0
Off-system | Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues 0.0 0.0
Miscellaneous    
Disaggregation of Revenue [Line Items]    
Customer revenues 23.9 17.6
Miscellaneous | Gas Distribution Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 18.4 14.0
Miscellaneous | Electric Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 5.5 3.6
Miscellaneous | Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues $ 0.0 $ 0.0