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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 12 Months Ended
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]        
Operating Revenues $ 5,455.1 $ 5,455.1 $ 5,505.4 $ 5,850.6
Cost of energy   1,132.2 1,533.3 2,110.5
O&M   1,515.2 1,494.9 1,489.4
Depreciation and amortization   1,043.2 908.2 820.8
Total other taxes   300.0 270.6 268.3
Operating Income   1,455.5 1,295.5 1,265.8
Capital Expenditures   3,692.5 2,690.7 2,298.0
Consolidated Assets 31,788.1 31,788.1 31,077.2 26,736.6
Total Reportable Segments        
Segment Reporting Information [Line Items]        
Operating Revenues   5,468.0 5,517.7 5,851.5
Cost of energy   1,132.2 1,533.3 2,110.5
O&M   1,598.9 1,580.0 1,531.7
Depreciation and amortization   999.4 865.5 778.8
Total other taxes   282.9 256.7 256.3
Other segment items   6.1 2.2 (103.9)
Operating Income   1,448.5 1,280.0 1,278.1
Capital Expenditures   3,461.4 2,454.4 2,256.8
Consolidated Assets 30,593.0 30,593.0 27,627.1 24,819.3
Total Reportable Segments | Nonrelated Party        
Segment Reporting Information [Line Items]        
Operating Revenues   5,454.2 5,504.6 5,838.1
Total Reportable Segments | Intersegment Revenue        
Segment Reporting Information [Line Items]        
Operating Revenues   13.8 13.1 13.4
Corporate and Other        
Segment Reporting Information [Line Items]        
Operating Revenues   581.9 504.6 477.5
Operating Income   7.0 15.5 (12.3)
Capital Expenditures   231.1 236.3 41.2
Consolidated Assets 1,195.1 1,195.1 3,450.1 1,917.3
Eliminations        
Segment Reporting Information [Line Items]        
Operating Revenues   (594.8) (516.9) (478.4)
Columbia Operations        
Segment Reporting Information [Line Items]        
Operating Revenues   2,703.2 2,733.9 2,951.9
Columbia Operations | Total Reportable Segments        
Segment Reporting Information [Line Items]        
Operating Revenues   2,716.0 2,746.1 2,964.4
Cost of energy   514.7 645.0 978.4
O&M   837.5 792.3 791.3
Depreciation and amortization   409.1 371.7 329.4
Total other taxes   218.6 198.8 184.2
Other segment items   7.4 0.0 (103.9)
Operating Income   728.7 738.3 785.0
Capital Expenditures   (1,209.0) (1,159.6) (1,237.9)
Consolidated Assets 14,769.5 14,769.5 13,664.5 13,059.4
Columbia Operations | Total Reportable Segments | Nonrelated Party        
Segment Reporting Information [Line Items]        
Operating Revenues   2,703.2 2,733.9 2,951.9
Columbia Operations | Total Reportable Segments | Intersegment Revenue        
Segment Reporting Information [Line Items]        
Operating Revenues   12.8 12.2 12.5
NIPSCO Operations        
Segment Reporting Information [Line Items]        
Operating Revenues 2,751.0      
NIPSCO Operations | Total Reportable Segments        
Segment Reporting Information [Line Items]        
Operating Revenues   2,752.0 2,771.6 2,887.1
Cost of energy   617.5 888.3 1,132.1
O&M   761.4 787.7 740.4
Depreciation and amortization   590.3 493.8 449.4
Total other taxes   64.3 57.9 72.1
Other segment items   (1.3) 2.2 0.0
Operating Income   719.8 541.7 493.1
Capital Expenditures   (2,252.4) (1,294.8) (1,018.9)
Consolidated Assets $ 15,823.5 15,823.5 13,962.6 11,759.9
NIPSCO Operations | Total Reportable Segments | Nonrelated Party        
Segment Reporting Information [Line Items]        
Operating Revenues   2,751.0 2,770.7 2,886.2
NIPSCO Operations | Total Reportable Segments | Intersegment Revenue        
Segment Reporting Information [Line Items]        
Operating Revenues   $ 1.0 $ 0.9 $ 0.9