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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Customer revenues $ 4,731.3 $ 4,473.2 $ 5,053.4
Other revenues 168.3 208.5 155.5
Total Operating Revenues 4,899.6 4,681.7 5,208.9
Gas Distribution Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 3,126.1 3,032.0 3,455.2
Other revenues 45.1 96.1 54.5
Total Operating Revenues 3,171.2 3,128.1 3,509.7
Electric Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 1,604.4 1,440.4 1,597.4
Other revenues 91.9 95.5 101.0
Total Operating Revenues 1,696.3 1,535.9 1,698.4
Corporate and Other      
Disaggregation of Revenue [Line Items]      
Customer revenues 0.8 0.8 0.8
Other revenues 31.3 16.9 0.0
Total Operating Revenues 32.1 17.7 0.8
Residential      
Disaggregation of Revenue [Line Items]      
Customer revenues 2,677.3 2,602.8 2,790.6
Residential | Gas Distribution Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 2,109.4 2,075.0 2,309.0
Residential | Electric Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 567.9 527.8 481.6
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 1,257.3 1,150.8 1,257.9
Commercial | Gas Distribution Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 722.4 670.5 771.3
Commercial | Electric Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 534.9 480.3 486.6
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 689.1 624.9 852.9
Industrial | Gas Distribution Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 195.7 212.8 245.2
Industrial | Electric Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 493.4 412.1 607.7
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 71.3 41.0 77.7
Off-system | Gas Distribution Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 71.3 41.0 77.7
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 36.3 53.7 74.3
Miscellaneous | Gas Distribution Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 27.3 32.7 52.0
Miscellaneous | Electric Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 8.2 20.2 21.5
Miscellaneous | Corporate and Other      
Disaggregation of Revenue [Line Items]      
Customer revenues $ 0.8 $ 0.8 $ 0.8