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Business Segment Information (Schedule Of Operating Income Derived From Revenues And Expenses By Segment) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]      
Consolidated Operating Income (Loss) $ 759.4 $ 583.4  
Total Assets 33,105.1   $ 31,788.1
Regulated Operating Revenue 2,183.2 1,706.3  
Cost of energy 647.5 425.0  
Utilities Operating Expense, Maintenance and Operations 427.8 378.4  
Taxes, Miscellaneous 89.6 77.4  
Depreciation, Depletion and Amortization 258.6 242.1  
Operating Segments      
Segment Reporting Information [Line Items]      
Consolidated Operating Income (Loss) 757.7 578.4  
Regulated Operating Revenue 2,185.5 1,709.6  
Cost of energy 647.5 425.0  
Utilities Operating Expense, Maintenance and Operations 445.0 402.0  
Taxes, Miscellaneous 85.5 73.3  
Segment Reporting, Other Segment Item, Amount 0.3    
Depreciation, Depletion and Amortization 249.5 230.9  
Operating Segments | Nonrelated Party      
Segment Reporting Information [Line Items]      
Regulated Operating Revenue 2,182.0 1,706.1  
Operating Segments | Related Party      
Segment Reporting Information [Line Items]      
Regulated Operating Revenue 3.5 3.5  
Corporate and Other      
Segment Reporting Information [Line Items]      
Consolidated Operating Income (Loss) 1.7 5.0  
Total Assets 1,335.5   1,195.1
Regulated Operating Revenue 145.4 140.1  
Eliminations      
Segment Reporting Information [Line Items]      
Regulated Operating Revenue (147.7) (143.4)  
Columbia Operations | Operating Segments      
Segment Reporting Information [Line Items]      
Consolidated Operating Income (Loss) 445.8 362.0  
Total Assets 14,962.2   14,769.5
Regulated Operating Revenue 1,243.8 956.9  
Cost of energy 379.8 228.8  
Utilities Operating Expense, Maintenance and Operations 243.0 210.7  
Taxes, Miscellaneous 67.0 57.2  
Segment Reporting, Other Segment Item, Amount 0.0    
Depreciation, Depletion and Amortization 108.2 98.2  
Columbia Operations | Operating Segments | Nonrelated Party      
Segment Reporting Information [Line Items]      
Regulated Operating Revenue 1,240.6 953.7  
Columbia Operations | Operating Segments | Related Party      
Segment Reporting Information [Line Items]      
Regulated Operating Revenue 3.2 3.2  
NIPSCO Operations      
Segment Reporting Information [Line Items]      
Regulated Operating Revenue 941.4 752.4  
NIPSCO Operations | Operating Segments      
Segment Reporting Information [Line Items]      
Consolidated Operating Income (Loss) 311.9 216.4  
Total Assets 16,807.4   $ 15,823.5
Regulated Operating Revenue 941.7 752.7  
Cost of energy 267.7 196.2  
Utilities Operating Expense, Maintenance and Operations 202.0 191.3  
Taxes, Miscellaneous 18.5 16.1  
Segment Reporting, Other Segment Item, Amount 0.3    
Depreciation, Depletion and Amortization 141.3 132.7  
NIPSCO Operations | Operating Segments | Nonrelated Party      
Segment Reporting Information [Line Items]      
Regulated Operating Revenue 941.4 752.4  
NIPSCO Operations | Operating Segments | Related Party      
Segment Reporting Information [Line Items]      
Regulated Operating Revenue $ 0.3 $ 0.3