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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Disaggregation of Revenue [Line Items]        
Customer revenues [1] $ 861.5 $ 891.0 $ 3,320.1 $ 3,694.7
Other revenues 41.0 40.5 150.6 117.0
Total Operating Revenues 902.5 931.5 3,470.7 3,811.7
Gas Distribution Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues [1] 454.3 451.2 2,224.9 2,462.7
Other revenues 15.8 12.4 79.5 43.5
Total Operating Revenues 470.1 463.6 2,304.4 2,506.2
Electric Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues [1] 407.0 439.6 1,094.6 1,231.4
Other revenues 25.2 28.1 71.1 73.5
Total Operating Revenues 432.2 467.7 1,165.7 1,304.9
Corporate and Other        
Disaggregation of Revenue [Line Items]        
Customer revenues [1] 0.2 0.2 0.6 0.6
Other revenues 0.0 0.0 0.0 0.0
Total Operating Revenues 0.2 0.2 0.6 0.6
Residential        
Disaggregation of Revenue [Line Items]        
Customer revenues [1] 471.7 437.0 1,929.6 2,012.0
Residential | Gas Distribution Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues [1] 306.9 288.3 1,518.1 1,638.6
Residential | Electric Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues [1] 164.8 148.7 411.5 373.4
Residential | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Customer revenues [1] 0.0 0.0 0.0 0.0
Commercial        
Disaggregation of Revenue [Line Items]        
Customer revenues [1] 224.1 227.2 849.3 913.9
Commercial | Gas Distribution Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues [1] 91.8 90.9 483.9 543.2
Commercial | Electric Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues [1] 132.3 136.3 365.4 370.7
Commercial | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Customer revenues [1] 0.0 0.0 0.0 0.0
Industrial        
Disaggregation of Revenue [Line Items]        
Customer revenues [1] 145.5 196.8 466.7 651.7
Industrial | Gas Distribution Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues [1] 42.8 45.3 165.6 181.1
Industrial | Electric Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues [1] 102.7 151.5 301.1 470.6
Industrial | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Customer revenues [1] 0.0 0.0 0.0 0.0
Off-system        
Disaggregation of Revenue [Line Items]        
Customer revenues [1] 6.0 16.9 32.7 60.4
Off-system | Gas Distribution Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues [1] 6.0 16.9 32.7 60.4
Off-system | Electric Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues [1] 0.0 0.0 0.0 0.0
Off-system | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Customer revenues [1] 0.0 0.0 0.0 0.0
Miscellaneous        
Disaggregation of Revenue [Line Items]        
Customer revenues [1] 14.2 13.1 41.8 56.7
Miscellaneous | Gas Distribution Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues [1] 6.8 9.8 24.6 39.4
Miscellaneous | Electric Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues [1] 7.2 3.1 16.6 16.7
Miscellaneous | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Customer revenues [1] $ 0.2 $ 0.2 $ 0.6 $ 0.6
[1] Customer revenue amounts exclude intersegment revenues. See Note 21, "Business Segment Information," for discussion of intersegment revenues.