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Statements Of Consolidated Income (Loss) - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating Revenues      
Customer revenues $ 5,347.8 $ 5,738.6 $ 4,731.3
Other revenues 157.6 112.0 168.3
Total Operating Revenues 5,505.4 5,850.6 4,899.6
Operating Expenses      
Cost of energy 1,533.3 2,110.5 1,392.3
Operation and maintenance 1,494.9 1,489.4 1,456.0
Depreciation and amortization 908.2 820.8 748.4
Loss (gain) on sale of assets, net 2.9 (104.2) 7.7
Other taxes 270.6 268.3 288.3
Total Operating Expenses 4,209.9 4,584.8 3,892.7
Operating Income 1,295.5 1,265.8 1,006.9
Other Income (Deductions)      
Interest expense, net (489.6) (361.6) (341.1)
Other, net 8.0 52.2 40.8
Total Other Deductions, Net (481.6) (309.4) (300.3)
Income before Income Taxes 813.9 956.4 706.6
Income Taxes 139.5 164.6 117.8
Net Income 674.4 791.8 588.8
Net (loss) income attributable to noncontrolling interest     3.9
Net Income attributable to NiSource 714.3 804.1 584.9
Preferred dividends (42.8) (55.1) (55.1)
Net Income Available to Common Shareholders $ 661.7 $ 749.0 $ 529.8
Earnings Per Share      
Basic Earnings Per Share $ 1.59 $ 1.84 $ 1.35
Diluted Earnings Per Share $ 1.48 $ 1.70 $ 1.27
Average common shares outstanding - Basic 416,100 407,100 393,600
Diluted Average Common Shares 447,900 442,700 417,300
Preferred Stock Redemption Premium $ (9.8) $ 0.0 $ 0.0