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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

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