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Statements Of Consolidated Income (Loss) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Operating Revenues    
Customer revenues $ 1,643.0 $ 1,896.1
Other revenues 63.3 69.9
Total Operating Revenues 1,706.3 1,966.0
Operating Expenses    
Cost of energy 425.0 765.1
Operation and maintenance 378.4 391.2
Depreciation and amortization 242.1 206.9
Other taxes 77.4 71.8
Operating Costs and Expenses 1,122.9 1,435.0
Operating Income 583.4 531.0
Other Income (Deductions)    
Interest expense, net (116.3) (108.9)
Other, net 9.2 1.5
Total Other Deductions, Net (107.1) (107.4)
Income before Income Taxes 476.3 423.6
Income Taxes 76.0 85.8
Net Income 400.3 337.8
Net income (loss) attributable to noncontrolling interest 35.3 4.8
Net Income Attributable to NiSource 365.0 333.0
Preferred Stock Redemption Premium (14.0) 0.0
Preferred dividends (6.7) (13.8)
Net Income Available to Common Shareholders $ 344.3 $ 319.2
Earnings Per Share    
Basic Earnings Per Share $ 0.77 $ 0.77
Diluted Earnings Per Share $ 0.77 $ 0.71
Basic Average Common Shares Outstanding 447.9 412.8
Diluted Average Common Shares 449.4 447.1
Noncontrolling Interest    
Other Income (Deductions)    
Net income (loss) attributable to noncontrolling interest   $ 4.8
Preferred Stock Redemption Premium $ 0.0