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Revenue Recognition (Allowance for Credit Losses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]      
Allowance for Credit Loss $ 23.9 $ 23.5 $ 52.3
Current period provisions 36.0 7.2  
Write-offs charged against allowance (57.4) (54.4)  
Recoveries of amounts previously written off 21.8 18.4  
Gas Distribution Operations      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Allowance for Credit Loss 17.2 18.9 41.8
Current period provisions 29.1 5.8  
Write-offs charged against allowance (52.1) (46.7)  
Recoveries of amounts previously written off 21.3 18.0  
Electric Operations      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Allowance for Credit Loss 5.9 3.8 9.7
Current period provisions 6.9 1.4  
Write-offs charged against allowance (5.3) (7.7)  
Recoveries of amounts previously written off 0.5 0.4  
Corporate and Other      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Allowance for Credit Loss 0.8 0.8 $ 0.8
Current period provisions 0.0 0.0  
Write-offs charged against allowance 0.0 0.0  
Recoveries of amounts previously written off $ 0.0 $ 0.0