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Variable Interest Entities (Narrative) (Details)
$ in Millions
 1 Months Ended 12 Months Ended
Jun. 17, 2023
USD ($)
Rate
Aug. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2023
MW
Dec. 31, 2023
Rate
Dec. 31, 2023
Variable Interest Entity [Line Items]                
Wind Power Purchase Agreement, Purchase Percentage | Rate             100.00%  
Milestone and final payments to renewable generation asset developer     $ 761.4 $ 323.9 $ 240.4      
Obligation to the Developer     0.0 0.0 277.5      
Income Taxes     139.5 164.6 $ 117.8      
Payments to Acquire Assets, Investing Activities   $ 307.2            
Payments to Acquire Interest in Subsidiaries and Affiliates     389.2          
Business Combination, Price of Acquisition, Expected $ 2,150.0              
Business Acquisition, Transaction Costs     54.7          
Proceeds from Contributed Capital     2,160.0          
Redeemable Noncontrolling Interest, Equity, Other, Carrying Amount     1,360.0          
Other Current Liabilities                
Variable Interest Entity [Line Items]                
Other Accrued Liabilities     47.6          
NIPSCO Holdings II                
Variable Interest Entity [Line Items]                
Subsidiary, Ownership Percentage, Parent | Rate 19.90%              
NiSource                
Variable Interest Entity [Line Items]                
Subsidiary, Ownership Percentage, Parent             80.10% 80.10%
Rosewater                
Variable Interest Entity [Line Items]                
Nameplate Capacity | MW           102    
Indiana Crossroads Wind                
Variable Interest Entity [Line Items]                
Nameplate Capacity | MW           302    
Indiana Crossroads Solar                
Variable Interest Entity [Line Items]                
Nameplate Capacity | MW           465    
Dunns Bridge I                
Variable Interest Entity [Line Items]                
Nameplate Capacity | MW           465    
Consolidated Variable Interest Entities                
Variable Interest Entity [Line Items]                
Obligation to the Developer       347.2        
Interest paid to developer       $ 42.0        
Income Taxes     63.5          
NIPSCO's Cash Contribution     $ 401.5