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Other Commitments And Contingencies (Narrative) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Nov. 30, 2018
USD ($)
Jul. 31, 2008
MW
Sep. 30, 2018
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
May 31, 2018
USD ($)
Feb. 01, 2018
USD ($)
Other Commitments And Contingencies [Line Items]                
Payments made in connection with operating leases       $ 49,100 $ 49,500 $ 52,000    
Capital lease payments       213,900 171,200      
Capital leases related accumulated depreciation       37,100 32,400      
Wind power purchase agreement capacity | MW   100            
Each wind power purchase agreement capacity | MW   50            
Capital Investment Program to Install Over-Pressurization Protection Devices       150,000        
Line of Credit Facility, Amount Outstanding       0        
Liability Insurance       800,000        
Property Insurance       300,000        
Insurance Recoveries       135,000        
Proceeds From Insurance Settlement       5,000        
Estimated Third-Party Claims       292,000        
Insurance Settlements Receivable       130,000        
Recorded reserves to cover environmental remediation at various sites       101,200 111,400      
Payments Pure Air       $ 8,300 22,000      
Liability Associated with Bailly Generating Station Retirement - Pure Air Contract Termination Portion           $ 16,000    
MGP Sites                
Other Commitments And Contingencies [Line Items]                
Number of waste disposal sites identified by program       63        
Liability for estimated remediation costs       $ 97,500 106,900      
Reasonably possible remediation costs variance from reserve       20,000        
NIPSCO                
Other Commitments And Contingencies [Line Items]                
Estimated Cost of Compliance with Coal Combustion Residuals, Maximum       193,000        
Bailly Unit 8 Portion of Net Book Value in Net Utility Plant               $ 15,000
Estimated Cost of Compliance with Effluent Limitations Guidelines       $ 170,000        
Regulatory Asset Associated with Bailly Generating Station Retirement             $ 103,000 $ 142,000
Columbia Of Massachusetts                
Other Commitments And Contingencies [Line Items]                
Gas Meters Affected       7,500        
Businesses Impacted by Incident       700        
Consent Order Fine $ 75              
Pipeline Replacement Expenses       $ 167,000        
Expenses Related to Third Party Claims, Other       266,000        
Miles of Affected Cast Iron and Bare Steel Pipeline System     45          
Loss Recorded During Period       $ 1,023,000        
Maximum                
Other Commitments And Contingencies [Line Items]                
Long term purchase commitment time period       20 years        
Maximum | Columbia Of Massachusetts                
Other Commitments And Contingencies [Line Items]                
Penalty Per Violation of Operational Directives During Restoration Efforts       $ 1,000        
Civil Penalty Assessed for Violation of Federal Pipeline Safety Regulations       209        
Civil Penalty Assessed for Series of Violations of Federal Pipeline Safety Regulations       2,100        
Penalty Per Violation of Emergency Response Plan       250        
Penalty for Violations of Emergency Response Plan       20,000        
Expenses Related to Third-Party Claims       790,000        
Incident-Related Costs       345,000        
Estimated Capital Cost of the Pipeline Replacement       $ 230,000        
Minimum                
Other Commitments And Contingencies [Line Items]                
Long term purchase commitment time period       15 years        
Minimum | Columbia Of Massachusetts                
Other Commitments And Contingencies [Line Items]                
Expenses Related to Third-Party Claims       $ 757,000        
Incident-Related Costs       330,000        
Estimated Capital Cost of the Pipeline Replacement       $ 220,000        
Pipeline Capacity Transportation And Storage | Maximum                
Other Commitments And Contingencies [Line Items]                
Long Term Purchase Commitment Expiration Year       2045        
Pipeline Capacity Transportation And Storage | Minimum                
Other Commitments And Contingencies [Line Items]                
Long Term Purchase Commitment Expiration Year       2019        
Coal Transportation | Maximum                
Other Commitments And Contingencies [Line Items]                
Long Term Purchase Commitment Expiration Year       2021        
Standby Letters of Credit                
Other Commitments And Contingencies [Line Items]                
Line of Credit Facility, Amount Outstanding       $ 10,200 $ 11,100