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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disaggregation of Revenue [Line Items]      
Customer revenues $ 5,347.8 $ 5,738.6 $ 4,731.3
Other revenues 157.6 112.0 168.3
Total Operating Revenues 5,505.4 5,850.6 4,899.6
Gas Distribution Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 3,646.8 4,003.1 3,126.1
Other revenues 73.6 4.1 45.1
Total Operating Revenues 3,720.4 4,007.2 3,171.2
Electric Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 1,701.0 1,735.5 1,604.4
Other revenues 83.2 95.4 91.9
Total Operating Revenues 1,784.2 1,830.9 1,696.3
Corporate and Other      
Disaggregation of Revenue [Line Items]      
Customer revenues 0.0 0.0 0.8
Other revenues 0.8 12.5 31.3
Total Operating Revenues 0.8 12.5 32.1
Residential      
Disaggregation of Revenue [Line Items]      
Customer revenues 3,046.4 3,202.1 2,677.3
Residential | Gas Distribution Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 2,462.5 2,609.7 2,109.4
Residential | Electric Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 583.9 592.4 567.9
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 1,426.0 1,510.6 1,257.3
Commercial | Gas Distribution Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 847.9 939.6 722.4
Commercial | Electric Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 578.1 571.0 534.9
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 700.1 781.2 689.1
Industrial | Gas Distribution Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 226.0 220.6 195.7
Industrial | Electric Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 474.1 560.6 493.4
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 60.6 192.9 71.3
Off-system | Gas Distribution Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 60.6 192.9 71.3
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 69.6 24.1 6.7
Miscellaneous | Gas Distribution Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 48.2 38.2 25.9
Miscellaneous | Electric Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 21.4 (14.1) (20.0)
Miscellaneous | Corporate and Other      
Disaggregation of Revenue [Line Items]      
Customer revenues 0.0 0.0 0.8
Wholesale      
Disaggregation of Revenue [Line Items]      
Customer revenues 33.6 15.6 17.1
Wholesale | Gas Distribution Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 1.6 2.1 1.4
Wholesale | Electric Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 32.0 13.5 15.7
Wholesale | Corporate and Other      
Disaggregation of Revenue [Line Items]      
Customer revenues 0.0 0.0 0.0
Public Authority      
Disaggregation of Revenue [Line Items]      
Customer revenues 11.5 12.1 12.5
Public Authority | Gas Distribution Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 0.0 0.0 0.0
Public Authority | Electric Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 11.5 12.1 12.5
Public Authority | Corporate and Other      
Disaggregation of Revenue [Line Items]      
Customer revenues $ 0.0 $ 0.0 $ 0.0