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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]      
Customer revenues $ 4,473.2 $ 5,053.4 $ 4,991.1
Other revenues 208.5 155.5 123.4
Total Operating Revenues 4,681.7 5,208.9 5,114.5
Gas Distribution Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 3,032.0 3,455.2 3,372.0
Other revenues 96.1 54.5 34.4
Total Operating Revenues 3,128.1 3,509.7 3,406.4
Electric Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 1,440.4 1,597.4 1,618.4
Other revenues 95.5 101.0 89.0
Total Operating Revenues 1,535.9 1,698.4 1,707.4
Corporate and Other      
Disaggregation of Revenue [Line Items]      
Customer revenues 0.8 0.8 0.7
Other revenues 16.9 0.0 0.0
Total Operating Revenues 17.7 0.8 0.7
Residential      
Disaggregation of Revenue [Line Items]      
Customer revenues 2,602.8 2,790.6 2,744.7
Residential | Gas Distribution Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 2,075.0 2,309.0 2,250.0
Residential | Electric Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 527.8 481.6 494.7
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 1,150.8 1,257.9 1,244.6
Commercial | Gas Distribution Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 670.5 771.3 751.9
Commercial | Electric Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 480.3 486.6 492.7
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 624.9 852.9 841.6
Industrial | Gas Distribution Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 212.8 245.2 228.0
Industrial | Electric Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 412.1 607.7 613.6
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 41.0 77.7 92.4
Off-system | Gas Distribution Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 41.0 77.7 92.4
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 53.7 74.3 67.8
Miscellaneous | Gas Distribution Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 32.7 52.0 49.7
Miscellaneous | Electric Operations      
Disaggregation of Revenue [Line Items]      
Customer revenues 20.2 21.5 17.4
Miscellaneous | Corporate and Other      
Disaggregation of Revenue [Line Items]      
Customer revenues $ 0.8 $ 0.8 $ 0.7