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Revenue Recognition Revenue Recognition (Allowance for Credit Losses) (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Dec. 31, 2020
Accounts Receivable Allowance For Credit Loss [Line Items]      
Accounts Receivable, Allowance for Credit Loss $ 26.1 $ 23.5 $ 52.3
Current period provisions 19.0 7.2  
Write-offs charged against allowance 24.0 54.4  
Recoveries of amounts previously written off 7.6 18.4  
Gas Distribution Operations      
Accounts Receivable Allowance For Credit Loss [Line Items]      
Accounts Receivable, Allowance for Credit Loss 19.7 18.9 41.8
Current period provisions 14.8 5.8  
Write-offs charged against allowance 21.3 46.7  
Recoveries of amounts previously written off 7.3 18.0  
Electric Operations      
Accounts Receivable Allowance For Credit Loss [Line Items]      
Accounts Receivable, Allowance for Credit Loss 5.6 3.8 9.7
Current period provisions 4.2 1.4  
Write-offs charged against allowance 2.7 7.7  
Recoveries of amounts previously written off 0.3 0.4  
Corporate and Other      
Accounts Receivable Allowance For Credit Loss [Line Items]      
Accounts Receivable, 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