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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disaggregation of Revenue [Line Items]      
Customer revenues $ 5,738.6 $ 4,731.3 $ 4,473.2
Other revenues 112.0 168.3 208.5
Total Operating Revenues 5,850.6 4,899.6 4,681.7
Gas Distribution Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 4,003.1 3,126.1 3,032.0
Other revenues 4.1 45.1 96.1
Total Operating Revenues 4,007.2 3,171.2 3,128.1
Electric Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 1,735.5 1,604.4 1,440.4
Other revenues 95.4 91.9 95.5
Total Operating Revenues 1,830.9 1,696.3 1,535.9
Corporate and Other      
Disaggregation of Revenue [Line Items]      
Customer revenues 0.0 0.8 0.8
Other revenues 12.5 31.3 16.9
Total Operating Revenues 12.5 32.1 17.7
Residential      
Disaggregation of Revenue [Line Items]      
Customer revenues 3,202.1 2,677.3 2,602.8
Residential | Gas Distribution Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 2,609.7 2,109.4 2,075.0
Residential | Electric Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 592.4 567.9 527.8
Residential | Corporate and Other      
Disaggregation of Revenue [Line Items]      
Customer revenues 0.0 0.0 0.0
Commercial      
Disaggregation of Revenue [Line Items]      
Customer revenues 1,510.6 1,257.3 1,150.8
Commercial | Gas Distribution Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 939.6 722.4 670.5
Commercial | Electric Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 571.0 534.9 480.3
Commercial | Corporate and Other      
Disaggregation of Revenue [Line Items]      
Customer revenues 0.0 0.0 0.0
Industrial      
Disaggregation of Revenue [Line Items]      
Customer revenues 781.2 689.1 624.9
Industrial | Gas Distribution Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 220.6 195.7 212.8
Industrial | Electric Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 560.6 493.4 412.1
Industrial | Corporate and Other      
Disaggregation of Revenue [Line Items]      
Customer revenues 0.0 0.0 0.0
Off-system      
Disaggregation of Revenue [Line Items]      
Customer revenues 192.9 71.3 41.0
Off-system | Gas Distribution Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 192.9 71.3 41.0
Off-system | Electric Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 0.0 0.0 0.0
Off-system | Corporate and Other      
Disaggregation of Revenue [Line Items]      
Customer revenues 0.0 0.0 0.0
Miscellaneous      
Disaggregation of Revenue [Line Items]      
Customer revenues 51.8 36.3 53.7
Miscellaneous | Gas Distribution Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 40.3 27.3 32.7
Miscellaneous | Electric Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 11.5 8.2 20.2
Miscellaneous | Corporate and Other      
Disaggregation of Revenue [Line Items]      
Customer revenues $ 0.0 $ 0.8 $ 0.8