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Statements Of Consolidated Income (Loss) - USD ($)
shares in Thousands, $ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating Revenues    
Customer revenues $ 1,506.5 $ 1,525.9
Other revenues 39.1 79.6
Total Operating Revenues 1,545.6 1,605.5
Operating Expenses    
Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization 476.8 462.4
Operation and maintenance 361.5 444.6
Depreciation and amortization 185.0 184.3
Loss on sale of assets, net 8.1 280.1
Other taxes 81.0 85.9
Operating Costs and Expenses 1,112.4 1,457.3
Operating Income 433.2 148.2
Other Income (Deductions)    
Interest expense, net (84.6) (92.9)
Other, net 10.5 5.4
Total Other Deductions, Net (74.1) (87.5)
Income before Income Taxes 359.1 60.7
Income Taxes 62.6 (14.9)
Net Income 296.5 75.6
Net income attributable to noncontrolling interest 1.0 0.0
Net Income attributable to NiSource 295.5 75.6
Preferred dividends (13.8) (13.8)
Net Income Available to Common Shareholders $ 281.7 $ 61.8
Earnings Per Share    
Basic Earnings Per Share $ 0.72 $ 0.16
Diluted Earnings Per Share $ 0.72 $ 0.16
Basic Average Common Shares Outstanding 392,657 383,062
Diluted Average Common Shares 393,912 384,114