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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Disaggregation of Revenue [Line Items]        
Customer revenues $ 1,058.2 $ 918.8 $ 4,055.0 $ 3,377.7
Other revenues 31.3 40.6 91.0 113.3
Total Operating Revenues 1,089.5 959.4 4,146.0 3,491.0
Revenues 1,089.5 959.4 4,146.0 3,491.0
Gas Distribution Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 567.3 463.6 2,742.6 2,160.6
Other revenues 5.1 8.7 7.6 21.8
Revenues 575.5 475.3 2,759.6 2,191.5
Gas Distribution Operations | Unaffiliated        
Disaggregation of Revenue [Line Items]        
Revenues 572.4 472.3 2,750.2 2,182.4
Electric Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 490.9 455.0 1,312.4 1,216.5
Other revenues 25.4 23.9 71.1 68.4
Revenues 516.5 479.1 1,384.1 1,285.5
Electric Operations | Unaffiliated        
Disaggregation of Revenue [Line Items]        
Revenues 516.3 478.9 1,383.5 1,284.9
Corporate and Other        
Disaggregation of Revenue [Line Items]        
Customer revenues 0.0 0.2 0.0 0.6
Other revenues 0.8 8.0 12.3 23.1
Revenues 116.1 116.8 361.8 353.6
Corporate and Other | Unaffiliated        
Disaggregation of Revenue [Line Items]        
Revenues 0.8 8.2 12.3 23.7
Residential        
Disaggregation of Revenue [Line Items]        
Customer revenues 508.9 483.0 2,226.3 1,896.3
Residential | Gas Distribution Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 330.1 304.3 1,772.0 1,456.5
Residential | Electric Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 178.8 178.7 454.3 439.8
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 273.5 250.8 1,059.8 900.4
Commercial | Gas Distribution Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 114.6 99.2 631.7 496.0
Commercial | Electric Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 158.9 151.6 428.1 404.4
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 194.5 166.7 578.9 510.6
Industrial | Gas Distribution Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 42.6 41.0 158.5 142.9
Industrial | Electric Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 151.9 125.7 420.4 367.7
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 72.7 14.5 150.5 46.0
Off-system | Gas Distribution Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 72.7 14.5 150.5 46.0
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 8.6 3.8 39.5 24.4
Miscellaneous | Gas Distribution Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 7.3 4.6 29.9 19.2
Miscellaneous | Electric Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 1.3 (1.0) 9.6 4.6
Miscellaneous | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Customer revenues $ 0.0 $ 0.2 $ 0.0 $ 0.6