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Statements Of Consolidated Income (Loss) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Operating Revenues    
Customer revenues $ 2,149.5 $ 1,643.0
Other revenues 33.7 63.3
Total Operating Revenues 2,183.2 1,706.3
Operating Expenses    
Cost of energy 647.5 425.0
Operation and maintenance 427.8 378.4
Depreciation and amortization 258.6 242.1
Loss on impairment of assets 0.3 0.0
Other taxes 89.6 77.4
Operating Costs and Expenses 1,423.8 1,122.9
Operating Income 759.4 583.4
Other Income (Deductions)    
Interest expense, net (132.8) (116.3)
Other, net 5.8 9.2
Total Other Deductions, Net (127.0) (107.1)
Income before Income Taxes 632.4 476.3
Income Taxes 105.7 76.0
Net Income 526.7 400.3
Net income attributable to noncontrolling interest 51.9 35.3
Net Income Attributable to NiSource 474.8 365.0
Preferred Stock Redemption Premium 0.0 (14.0)
Preferred dividends 0.0 (6.7)
Net Income Available to Common Shareholders $ 474.8 $ 344.3
Earnings Per Share    
Basic Earnings Per Share $ 1.01 $ 0.77
Diluted Earnings Per Share $ 1.00 $ 0.77
Basic Average Common Shares Outstanding 470.4 447.9
Diluted Average Common Shares 472.5 449.4
Noncontrolling Interest    
Other Income (Deductions)    
Net income attributable to noncontrolling interest   $ 35.3