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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disaggregation of Revenue [Line Items]    
Customer revenues $ 1,840.3 $ 1,506.5
Other revenues 33.0 39.1
Total Operating Revenues 1,873.3 1,545.6
Gas Distribution Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 1,433.9 1,127.1
Other revenues 2.8 8.7
Total Operating Revenues 1,436.7 1,135.8
Electric Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 406.4 379.2
Other revenues 23.7 23.3
Total Operating Revenues 430.1 402.5
Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues 0.0 0.2
Other revenues 6.5 7.1
Total Operating Revenues 6.5 7.3
Residential    
Disaggregation of Revenue [Line Items]    
Customer revenues 1,115.4 902.7
Residential | Gas Distribution Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 976.9 773.5
Residential | Electric Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 138.5 129.2
Residential | Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues 0.0 0.0
Commercial    
Disaggregation of Revenue [Line Items]    
Customer revenues 491.0 394.3
Commercial | Gas Distribution Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 356.5 271.4
Commercial | Electric Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 134.5 122.9
Commercial | Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues 0.0 0.0
Industrial    
Disaggregation of Revenue [Line Items]    
Customer revenues 197.6 180.8
Industrial | Gas Distribution Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 67.8 57.9
Industrial | Electric Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 129.8 122.9
Industrial | Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues 0.0 0.0
Off-system    
Disaggregation of Revenue [Line Items]    
Customer revenues 18.7 14.4
Off-system | Gas Distribution Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 18.7 14.4
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 17.6 14.3
Miscellaneous | Gas Distribution Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 14.0 9.9
Miscellaneous | Electric Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 3.6 4.2
Miscellaneous | Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues $ 0.0 $ 0.2