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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Disaggregation of Revenue [Line Items]        
Customer revenues $ 1,067.2 $ 1,156.5 $ 2,963.3 $ 2,996.8
Other revenues 22.8 26.7 92.7 59.7
Total Operating Revenues 1,090.0 1,183.2 3,056.0 3,056.5
Revenues 1,090.0 1,183.2 3,056.0 3,056.5
Gas Distribution Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 688.4 741.4 2,143.5 2,175.3
Other revenues 4.4 (0.3) 50.6 2.5
Revenues 695.9 744.3 2,200.3 2,184.1
Gas Distribution Operations | Unaffiliated        
Disaggregation of Revenue [Line Items]        
Revenues 692.8 741.1 2,194.1 2,177.8
Electric Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 378.8 415.1 819.8 821.5
Other revenues 18.2 22.0 41.7 45.7
Revenues 397.1 437.3 861.8 867.6
Electric Operations | Unaffiliated        
Disaggregation of Revenue [Line Items]        
Revenues 397.0 437.1 861.5 867.2
Corporate and Other        
Disaggregation of Revenue [Line Items]        
Customer revenues 0.0 0.0 0.0 0.0
Other revenues 0.2 5.0 0.4 11.5
Revenues 123.0 125.7 239.9 245.7
Corporate and Other | Unaffiliated        
Disaggregation of Revenue [Line Items]        
Revenues 0.2 5.0 0.4 11.5
Residential        
Disaggregation of Revenue [Line Items]        
Customer revenues 573.4 602.0 1,710.8 1,717.4
Residential | Gas Distribution Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 450.6 465.0 1,437.6 1,441.9
Residential | Electric Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 122.8 137.0 273.2 275.5
Residential | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Customer revenues 0.0 0.0 0.0 0.0
Commercial        
Disaggregation of Revenue [Line Items]        
Customer revenues 282.2 295.3 793.7 786.3
Commercial | Gas Distribution Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 152.1 160.6 512.7 517.1
Commercial | Electric Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 130.1 134.7 281.0 269.2
Commercial | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Customer revenues 0.0 0.0 0.0 0.0
Industrial        
Disaggregation of Revenue [Line Items]        
Customer revenues 163.7 186.8 369.8 384.4
Industrial | Gas Distribution Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 51.1 48.1 123.0 115.9
Industrial | Electric Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 112.6 138.7 246.8 268.5
Industrial | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Customer revenues 0.0 0.0 0.0 0.0
Off-system        
Disaggregation of Revenue [Line Items]        
Customer revenues 22.9 59.1 40.1 77.8
Off-system | Gas Distribution Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 22.9 59.1 40.1 77.8
Off-system | Electric Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 0.0 0.0 0.0 0.0
Off-system | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Customer revenues 0.0 0.0 0.0 0.0
Miscellaneous        
Disaggregation of Revenue [Line Items]        
Customer revenues 25.0 13.3 48.9 30.9
Miscellaneous | Gas Distribution Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 11.7 8.6 30.1 22.6
Miscellaneous | Electric Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 13.3 4.7 18.8 8.3
Miscellaneous | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Customer revenues $ 0.0 $ 0.0 $ 0.0 $ 0.0