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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]          
Consolidated Operating Income (Loss) $ 297.5 $ 218.3 $ 1,319.8 $ 1,038.7  
Total Assets 34,402.9   34,402.9   $ 31,788.1
Regulated Operating Revenue 1,273.1 1,076.3 4,739.3 3,867.3  
Cost of energy 193.6 165.9 1,102.9 755.6  
Utilities Operating Expense, Maintenance and Operations 401.1 357.4 1,225.1 1,093.5  
Taxes, Miscellaneous 74.6 65.7 238.4 210.4  
Depreciation, Depletion and Amortization 306.9 269.5 852.2 765.1  
Operating Segments          
Segment Reporting Information [Line Items]          
Consolidated Operating Income (Loss) 284.7 212.5 1,298.6 1,029.8  
Regulated Operating Revenue 1,275.5 1,079.6 4,746.5 3,877.1  
Cost of energy 193.7 165.9 1,103.0 755.6  
Utilities Operating Expense, Maintenance and Operations 427.9 380.6 1,291.6 1,161.4  
Taxes, Miscellaneous 71.1 60.8 227.1 197.3  
Segment Reporting, Other Segment Item, Amount 0.1   1.1 (0.1)  
Depreciation, Depletion and Amortization 298.0 259.8 825.1 733.1  
Operating Segments | Nonrelated Party          
Segment Reporting Information [Line Items]          
Regulated Operating Revenue 1,271.9 1,076.0 4,735.7 3,866.7  
Operating Segments | Related Party          
Segment Reporting Information [Line Items]          
Regulated Operating Revenue 3.6 3.6 10.8 10.4  
Corporate and Other          
Segment Reporting Information [Line Items]          
Consolidated Operating Income (Loss) 12.8 5.8      
Total Assets 1,300.2   1,300.2   1,195.1
Regulated Operating Revenue 151.8 145.9 441.8 425.1  
Eliminations          
Segment Reporting Information [Line Items]          
Regulated Operating Revenue (154.2) (149.2) (449.0) (434.9)  
Corporate and Other          
Segment Reporting Information [Line Items]          
Consolidated Operating Income (Loss)     21.2 8.9  
Corporate and Other | Unaffiliated          
Segment Reporting Information [Line Items]          
Revenues 1.2 0.3 3.6 0.6  
Columbia Operations | Unaffiliated          
Segment Reporting Information [Line Items]          
Revenues     2,326.7 1,864.5  
Columbia Operations | Operating Segments          
Segment Reporting Information [Line Items]          
Consolidated Operating Income (Loss) 52.1 41.2 620.1 499.8  
Total Assets 15,267.9   15,267.9   14,769.5
Regulated Operating Revenue 488.2 426.7 2,336.7 1,874.1  
Cost of energy 58.5 34.2 548.7 319.3  
Utilities Operating Expense, Maintenance and Operations 212.8 202.9 663.5 604.9  
Taxes, Miscellaneous 52.0 45.4 171.4 149.5  
Segment Reporting, Other Segment Item, Amount 0.1   0.4 0.0  
Depreciation, Depletion and Amortization 112.7 103.0 332.6 300.6  
Columbia Operations | Operating Segments | Nonrelated Party          
Segment Reporting Information [Line Items]          
Regulated Operating Revenue 484.9 423.4 2,326.7 1,864.5  
Columbia Operations | Operating Segments | Related Party          
Segment Reporting Information [Line Items]          
Regulated Operating Revenue 3.3 3.3 10.0 9.6  
NIPSCO Operations          
Segment Reporting Information [Line Items]          
Regulated Operating Revenue 787.0 652.6      
NIPSCO Operations | Unaffiliated          
Segment Reporting Information [Line Items]          
Revenues     2,409.0 2,002.2  
NIPSCO Operations | Intersegment          
Segment Reporting Information [Line Items]          
Revenues       0.8  
NIPSCO Operations | Operating Segments          
Segment Reporting Information [Line Items]          
Consolidated Operating Income (Loss) 232.6 171.3 678.5 530.0  
Total Assets 17,834.8   17,834.8   $ 15,823.5
Regulated Operating Revenue 787.3 652.9 2,409.8 2,003.0  
Cost of energy 135.2 131.7 554.3 436.3  
Utilities Operating Expense, Maintenance and Operations 215.1 177.7 628.1 556.5  
Taxes, Miscellaneous 19.1 15.4 55.7 47.8  
Segment Reporting, Other Segment Item, Amount 0.0   0.7 (0.1)  
Depreciation, Depletion and Amortization 185.3 156.8 492.5 $ 432.5  
NIPSCO Operations | Operating Segments | Nonrelated Party          
Segment Reporting Information [Line Items]          
Regulated Operating Revenue 787.0 652.6 2,409.0    
NIPSCO Operations | Operating Segments | Related Party          
Segment Reporting Information [Line Items]          
Regulated Operating Revenue $ 0.3 $ 0.3 $ 0.8