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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]    
Customer revenues $ 1,506.5 $ 1,525.9
Other revenues 39.1 79.6
Total Operating Revenues 1,545.6 1,605.5
Gas Distribution Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 1,127.1 1,171.3
Other revenues 8.7 56.7
Total Operating Revenues 1,135.8 1,228.0
Electric Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 379.2 354.4
Other revenues 23.3 22.9
Total Operating Revenues 402.5 377.3
Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues 0.2 0.2
Other revenues 7.1 0.0
Total Operating Revenues 7.3 0.2
Residential    
Disaggregation of Revenue [Line Items]    
Customer revenues 902.7 915.7
Residential | Gas Distribution Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 773.5 796.5
Residential | Electric Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 129.2 119.2
Residential | Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues 0.0 0.0
Commercial    
Disaggregation of Revenue [Line Items]    
Customer revenues 394.3 389.6
Commercial | Gas Distribution Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 271.4 269.4
Commercial | Electric Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 122.9 120.2
Commercial | Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues 0.0 0.0
Industrial    
Disaggregation of Revenue [Line Items]    
Customer revenues 180.8 183.3
Industrial | Gas Distribution Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 57.9 74.2
Industrial | Electric Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 122.9 109.1
Industrial | Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues 0.0 0.0
Off-system    
Disaggregation of Revenue [Line Items]    
Customer revenues 14.4 18.7
Off-system | Gas Distribution Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 14.4 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 14.3 18.6
Miscellaneous | Gas Distribution Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 9.9 12.5
Miscellaneous | Electric Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 4.2 5.9
Miscellaneous | Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues $ 0.2 $ 0.2