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Revenue Recognition (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 923.0 $ 1,250.6 $ 2,056.8 $ 2,619.7
Provision for Rate Refund        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0.0 0.9 2.0 (1.8)
Integrated market        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 26.2 69.8 57.7 135.6
Transmission        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 35.6 36.9 106.9 105.6
Other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 10.4 3.8 32.5 13.4
Residential        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 389.7 512.3 811.5 1,028.4
Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 240.1 305.4 529.9 626.9
Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 74.1 109.9 177.8 248.7
Oilfield        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 66.9 101.8 160.9 234.0
Public Authority and Street Light        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 80.0 109.8 177.6 228.9
System Sales Revenues        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 850.8 $ 1,139.2 $ 1,857.7 $ 2,366.9