XML 82 R64.htm IDEA: XBRL DOCUMENT v3.24.0.1
Revenue Recognition (Allowance for Credit Losses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]      
Allowance for Credit Loss $ 22.9 $ 23.9 $ 23.5
Current period provisions 39.8 36.0  
Write-offs charged against allowance (61.6) (57.4)  
Recoveries of amounts previously written off 20.8 21.8  
Gas Distribution Operations      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Allowance for Credit Loss 16.0 17.2 18.9
Current period provisions 33.8 29.1  
Write-offs charged against allowance (55.4) (52.1)  
Recoveries of amounts previously written off 20.4 21.3  
Electric Operations      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Allowance for Credit Loss 6.1 5.9 3.8
Current period provisions 6.0 6.9  
Write-offs charged against allowance (6.2) (5.3)  
Recoveries of amounts previously written off 0.4 0.5  
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