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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Disaggregation of Revenue [Line Items]        
Customer revenues $ 1,002.6 $ 1,058.2 $ 3,965.9 $ 4,055.0
Other revenues 24.8 31.3 117.5 91.0
Total Operating Revenues 1,027.4 1,089.5 4,083.4 4,146.0
Revenues 1,027.4 1,089.5 4,083.4 4,146.0
Gas Distribution Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 524.9 567.3 2,668.4 2,742.6
Other revenues 3.6 5.1 54.2 7.6
Revenues 531.5 575.5 2,731.8 2,759.6
Gas Distribution Operations | Unaffiliated        
Disaggregation of Revenue [Line Items]        
Revenues 528.5 572.4 2,722.6 2,750.2
Electric Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 477.7 490.9 1,297.5 1,312.4
Other revenues 21.0 25.4 62.7 71.1
Revenues 499.1 516.5 1,360.9 1,384.1
Electric Operations | Unaffiliated        
Disaggregation of Revenue [Line Items]        
Revenues 498.7 516.3 1,360.2 1,383.5
Corporate and Other        
Disaggregation of Revenue [Line Items]        
Customer revenues 0.0 0.0 0.0 0.0
Other revenues 0.2 0.8 0.6 12.3
Revenues 121.9 116.1 361.8 361.8
Corporate and Other | Unaffiliated        
Disaggregation of Revenue [Line Items]        
Revenues 0.2 0.8 0.6 12.3
Residential        
Disaggregation of Revenue [Line Items]        
Customer revenues 527.7 508.9 2,238.5 2,226.3
Residential | Gas Distribution Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 351.7 330.1 1,789.3 1,772.0
Residential | Electric Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 176.0 178.8 449.2 454.3
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 265.1 273.5 1,058.8 1,059.8
Commercial | Gas Distribution Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 108.5 114.6 621.2 631.7
Commercial | Electric Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 156.6 158.9 437.6 428.1
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 162.2 194.5 532.0 578.9
Industrial | Gas Distribution Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 46.3 42.6 169.3 158.5
Industrial | Electric Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 115.9 151.9 362.7 420.4
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 9.8 72.7 49.9 150.5
Off-system | Gas Distribution Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 9.8 72.7 49.9 150.5
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 37.8 8.6 86.7 39.5
Miscellaneous | Gas Distribution Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 8.6 7.3 38.7 29.9
Miscellaneous | Electric Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 29.2 1.3 48.0 9.6
Miscellaneous | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Customer revenues $ 0.0 $ 0.0 $ 0.0 $ 0.0