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Revenue Recognition (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers $ 741.1 $ 582.6
Provision for Rate Refund    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 3.0 0.0
Integrated Market    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 21.3 15.0
Transmission    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 39.8 35.6
Other    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 5.3 8.1
Residential    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 283.6 221.4
Commercial    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 206.6 148.8
Industrial    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 61.6 53.0
Oilfield    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 59.4 49.7
Public Authority and Street Light    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 60.5 51.0
System Sales Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers $ 671.7 $ 523.9