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Statements Of Consolidated Income (Loss) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Operating Revenues    
Customer revenues $ 1,840.3 $ 1,506.5
Other revenues 33.0 39.1
Total Operating Revenues 1,873.3 1,545.6
Operating Expenses    
Cost of energy 706.7 476.8
Operation and maintenance 394.3 361.5
Depreciation and amortization 192.7 185.0
Loss (gain) on sale of assets, net (105.0) 8.1
Other taxes 84.3 81.0
Operating Costs and Expenses 1,273.0 1,112.4
Operating Income 600.3 433.2
Other Income (Deductions)    
Interest expense, net (83.7) (84.6)
Other, net 10.9 10.5
Total Other Deductions, Net (72.8) (74.1)
Income before Income Taxes 527.5 359.1
Income Taxes 96.2 62.6
Net Income 431.3 296.5
Net income attributable to noncontrolling interest 4.5 1.0
Net Income Attributable to NiSource 426.8 295.5
Preferred dividends (13.8) (13.8)
Net Income Available to Common Shareholders $ 413.0 $ 281.7
Earnings Per Share    
Basic Earnings Per Share $ 1.02 $ 0.72
Diluted Earnings Per Share $ 0.94 $ 0.72
Basic Average Common Shares Outstanding 406.0 392.7
Diluted Average Common Shares 441.4 393.9