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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disaggregation of Revenue [Line Items]    
Customer revenues [1] $ 1,525.9 $ 1,834.5
Other revenues 79.6 35.3
Total Operating Revenues 1,605.5 1,869.8
Gas Distribution Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues [1] 1,171.3 1,426.0
Other revenues 56.7 12.8
Total Operating Revenues 1,228.0 1,438.8
Electric Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues [1] 354.4 408.3
Other revenues 22.9 22.5
Total Operating Revenues 377.3 430.8
Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues [1] 0.2 0.2
Other revenues 0.0 0.0
Total Operating Revenues 0.2 0.2
Residential    
Disaggregation of Revenue [Line Items]    
Customer revenues [1] 915.7 1,094.1
Residential | Gas Distribution Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues [1] 796.5 975.3
Residential | Electric Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues [1] 119.2 118.8
Residential | Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues [1] 0.0 0.0
Commercial    
Disaggregation of Revenue [Line Items]    
Customer revenues [1] 389.6 449.8
Commercial | Gas Distribution Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues [1] 269.4 330.5
Commercial | Electric Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues [1] 120.2 119.3
Commercial | Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues [1] 0.0 0.0
Industrial    
Disaggregation of Revenue [Line Items]    
Customer revenues [1] 183.3 246.2
Industrial | Gas Distribution Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues [1] 74.2 82.9
Industrial | Electric Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues [1] 109.1 163.3
Industrial | Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues [1] 0.0 0.0
Off-system    
Disaggregation of Revenue [Line Items]    
Customer revenues [1] 18.7 20.1
Off-system | Gas Distribution Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues [1] 18.7 20.1
Off-system | Electric Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues [1] 0.0 0.0
Off-system | Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues [1] 0.0 0.0
Miscellaneous    
Disaggregation of Revenue [Line Items]    
Customer revenues [1] 18.6 24.3
Miscellaneous | Gas Distribution Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues [1] 12.5 17.2
Miscellaneous | Electric Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues [1] 5.9 6.9
Miscellaneous | Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues [1] $ 0.2 $ 0.2
[1] Customer revenue amounts exclude intersegment revenues. See Note 21, "Business Segment Information," for discussion of intersegment revenues.