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Other Commitments And Contingencies (Narrative) (Details)
$ in Millions
 12 Months Ended 28 Months Ended
Dec. 31, 2022
USD ($)
Rate
MW
Dec. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
Other Commitments And Contingencies [Line Items]      
Wind power purchase agreement capacity | MW 500    
Major Rail Operators 3    
Line of Credit Facility, Amount Outstanding $ 0.0   $ 0.0
Guarantor Obligations, Current Carrying Value $ 841.6   288.9
Wind Power Purchase Agreement, Purchase Percentage | Rate 100.00%    
Restructuring and Related Cost, Expected Cost $ 38.0    
Estimated Maximum Disgorgement Exposure 9.7    
Proceeds from Legal Settlements 105.0    
Accrual for Environmental Loss Contingencies, Gross $ 86.5   91.1
MGP Sites      
Other Commitments And Contingencies [Line Items]      
Number of waste disposal sites identified by program 53    
Liability for estimated remediation costs $ 81.0   85.1
Reasonably possible remediation costs variance from reserve $ 17.0    
Columbia Of Massachusetts      
Other Commitments And Contingencies [Line Items]      
Pipeline Replacement Expenses   $ 258.0  
Coal Transportation | Maximum      
Other Commitments And Contingencies [Line Items]      
Long Term Purchase Commitment Expiration Year 2028    
Pipeline Service Agreements [Member] | Maximum      
Other Commitments And Contingencies [Line Items]      
Long Term Purchase Commitment Expiration Year 2038    
Pipeline Service Agreements [Member] | Minimum      
Other Commitments And Contingencies [Line Items]      
Long Term Purchase Commitment Expiration Year 2023    
IT Service Agreements [Member] | Maximum      
Other Commitments And Contingencies [Line Items]      
Long Term Purchase Commitment Expiration Year 2028    
Standby Letters of Credit      
Other Commitments And Contingencies [Line Items]      
Line of Credit Facility, Amount Outstanding $ 10.2   $ 18.9