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Statements Of Consolidated Income (Loss) - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Operating Revenues      
Customer revenues $ 5,282.9 $ 5,347.8 $ 5,738.6
Other revenues 172.2 157.6 112.0
Total Operating Revenues 5,455.1 5,505.4 5,850.6
Operating Expenses      
Cost of energy 1,132.2 1,533.3 2,110.5
Operation and maintenance 1,515.2 1,494.9 1,489.4
Depreciation and amortization 1,043.2 908.2 820.8
Loss on impairment of assets 6.1 0.0 0.0
Loss (gain) on sale of assets, net 2.9 2.9 (104.2)
Other taxes 300.0 270.6 268.3
Total Operating Expenses 3,999.6 4,209.9 4,584.8
Operating Income 1,455.5 1,295.5 1,265.8
Other Income (Deductions)      
Interest expense, net (517.2) (489.6) (361.6)
Other, net 64.5 8.0 52.2
Total Other Deductions, Net (452.7) (481.6) (309.4)
Income before Income Taxes 1,002.8 813.9 956.4
Income Taxes 158.1 139.5 164.6
Net Income 844.7 674.4 791.8
Net income (loss) attributable to noncontrolling interest 84.3 (39.9) (12.3)
Net Income attributable to NiSource 760.4 714.3 804.1
Preferred dividends (6.7) (42.8) (55.1)
Preferred redemption premium 14.0 9.8 0.0
Net Income Available to Common Shareholders $ 739.7 $ 661.7 $ 749.0
Earnings Per Share      
Basic Earnings Per Share $ 1.63 $ 1.59 $ 1.84
Diluted Earnings Per Share $ 1.62 $ 1.48 $ 1.70
Average common shares outstanding - Basic 454,200 416,100 407,100
Diluted Average Common Shares 456,000 447,900 442,700