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Statements Of Consolidated Income (Loss) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Operating Revenues    
Customer revenues $ 1,896.1 $ 1,840.3
Other revenues 69.9 33.0
Total Operating Revenues 1,966.0 1,873.3
Operating Expenses    
Cost of energy 765.1 706.7
Operation and maintenance 391.2 394.3
Depreciation and amortization 206.9 192.7
Gain on sale of assets, net 0.0 (105.0)
Other taxes 71.8 84.3
Operating Costs and Expenses 1,435.0 1,273.0
Operating Income 531.0 600.3
Other Income (Deductions)    
Interest expense, net (108.9) (83.7)
Other, net 1.5 10.9
Total Other Deductions, Net (107.4) (72.8)
Income before Income Taxes 423.6 527.5
Income Taxes 85.8 96.2
Net Income 337.8 431.3
Net income attributable to noncontrolling interest 4.8 4.5
Net Income Attributable to NiSource 333.0 426.8
Preferred dividends (13.8) (13.8)
Net Income Available to Common Shareholders $ 319.2 $ 413.0
Earnings Per Share    
Basic Earnings Per Share $ 0.77 $ 1.02
Diluted Earnings Per Share $ 0.71 $ 0.94
Basic Average Common Shares Outstanding 412.8 406.0
Diluted Average Common Shares 447.1 441.4