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Statements Of Consolidated Income (Loss) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Operating Revenues        
Customer revenues $ 1,067.2 $ 1,156.5 $ 2,963.3 $ 2,996.8
Other revenues 22.8 26.7 92.7 59.7
Total Operating Revenues 1,090.0 1,183.2 3,056.0 3,056.5
Operating Expenses        
Cost of energy 251.9 383.7 1,017.0 1,090.4
Operation and maintenance 369.5 381.9 760.7 776.2
Depreciation and amortization 233.1 208.7 440.0 401.4
Gain on sale of assets, net (0.3) 0.0 (0.3) (105.0)
Other taxes 66.9 65.6 138.7 149.9
Operating Costs and Expenses 921.1 1,039.9 2,356.1 2,312.9
Operating Income 168.9 143.3 699.9 743.6
Other Income (Deductions)        
Interest expense, net (110.5) (84.5) (219.4) (168.2)
Other, net 2.0 9.0 3.5 19.9
Total Other Deductions, Net (108.5) (75.5) (215.9) (148.3)
Income before Income Taxes 60.4 67.8 484.0 595.3
Income Taxes 14.1 12.0 99.9 108.2
Net Income 46.3 55.8 384.1 487.1
Net loss attributable to noncontrolling interest (12.5) (11.2) (7.7)  
Net Income Attributable to NiSource 58.8 67.0 391.8 493.8
Preferred Stock Redemption Premium (6.2) 0.0 (6.2) 0.0
Preferred dividends (12.7) (13.8) (26.5) (27.6)
Net Income Available to Common Shareholders $ 39.9 $ 53.2 $ 359.1 $ 466.2
Earnings Per Share        
Basic Earnings Per Share $ 0.10 $ 0.13 $ 0.87 $ 1.15
Diluted Earnings Per Share $ 0.09 $ 0.12 $ 0.80 $ 1.06
Basic Average Common Shares Outstanding 413.3 406.4 413.1 406.2
Diluted Average Common Shares 446.8 440.2 446.9 440.8