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Statements of Consolidated Income (Loss) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Operating Revenues        
Customer revenues $ 1,240.2 $ 1,046.1 $ 4,636.2 $ 3,743.2
Other revenues 32.9 30.2 103.1 124.1
Total Operating Revenues 1,273.1 1,076.3 4,739.3 3,867.3
Loss on sale of assets (0.6) (0.5) 0.2 1.1
Operating Expenses        
Cost of energy 193.6 165.9 1,102.9 755.6
Operation and maintenance 401.1 357.4 1,225.1 1,093.5
Depreciation and amortization 306.9 269.5 852.2 765.1
Loss on impairment of assets 0.0 0.0 0.7 2.9
Other taxes 74.6 65.7 238.4 210.4
Operating Costs and Expenses 975.6 858.0 3,419.5 2,828.6
Operating Income 297.5 218.3 1,319.8 1,038.7
Other Income (Deductions)        
Interest expense, net (179.8) (134.6) (451.7) (380.2)
Other, net 9.9 29.2 16.2 51.4
Total Other Deductions, Net (169.9) (105.4) (435.5) (328.8)
Income before Income Taxes 127.6 112.9 884.3 709.9
Income Taxes 20.6 15.9 150.1 109.5
Net Income 107.0 97.0 734.2 600.4
Net income attributable to noncontrolling interest 12.3 11.3 62.5 63.9
Net Income Attributable to NiSource 94.7 85.7 671.7 536.5
Preferred Stock Redemption Premium 0.0 0.0 0.0 (14.0)
Preferred dividends 0.0 0.0 0.0 (6.7)
Net Income Available to Common Shareholders $ 94.7 $ 85.7 $ 671.7 $ 515.8
Earnings Per Share        
Basic Earnings Per Share $ 0.20 $ 0.19 $ 1.42 $ 1.15
Diluted Earnings Per Share $ 0.20 $ 0.19 $ 1.42 $ 1.14
Basic Average Common Shares Outstanding 472.1 451.9 471.1 449.4
Diluted Average Common Shares 473.7 454.5 472.8 451.4
Noncontrolling Interest        
Other Income (Deductions)        
Net income attributable to noncontrolling interest $ 12.3 $ 11.3 $ 62.5 $ 63.9