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Other Commitments And Contingencies (Narrative) (Details)
$ in Millions
 9 Months Ended
Jun. 17, 2023
USD ($)
Rate
Sep. 30, 2023
USD ($)
Rate
Dec. 31, 2022
USD ($)
Other Commitments And Contingencies [Line Items]      
Guaranty Liabilities   $ 642.4 $ 841.6
Estimated Maximum Disgorgement Exposure   7.7  
Recorded reserves to cover environmental remediation at various sites   $ 82.7 86.5
Wind Power Purchase Agreement, Purchase Percentage | Rate   100.00%  
Other Commitment   $ 250.0  
Business Combination, Price of Acquisition, Expected $ 2,150.0    
Product Liability Contingency, Third-Party Recovery, Percentage | Rate   50.00%  
NiSource      
Other Commitments And Contingencies [Line Items]      
Subsidiary, Ownership Percentage, Parent | Rate 80.10%    
NIPSCO Holdings      
Other Commitments And Contingencies [Line Items]      
Subsidiary, Ownership Percentage, Parent | Rate 100.00%    
NIPSCO Holdings II      
Other Commitments And Contingencies [Line Items]      
Subsidiary, Ownership Percentage, Parent | Rate 19.90%    
Director | NIPSCO Holdings II      
Other Commitments And Contingencies [Line Items]      
Subsidiary, Ownership Percentage, Parent | Rate   17.50%  
MGP Sites      
Other Commitments And Contingencies [Line Items]      
Number of waste disposal sites identified by program   53  
Liability for Estimated Remediation Costs   $ 77.7 81.0
Reasonably possible remediation costs variance from reserve   15.1  
Standby Letters of Credit      
Other Commitments And Contingencies [Line Items]      
Long-term Line of Credit   $ 9.9 $ 10.2