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Statements Of Consolidated Income (Loss) - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating Revenues      
Customer revenues $ 4,731.3 $ 4,473.2 $ 5,053.4
Other revenues 168.3 208.5 155.5
Total Operating Revenues 4,899.6 4,681.7 5,208.9
Operating Expenses      
Cost of energy 1,392.3 1,109.3 1,534.8
Operation and maintenance 1,456.0 1,585.9 1,354.7
Depreciation and amortization 748.4 725.9 717.4
Impairment of goodwill and intangible assets 0.0 0.0 414.5
Loss on sale of assets, net 7.7 410.6 0.0
Other taxes 288.3 299.2 296.8
Total Operating Expenses 3,892.7 4,130.9 4,318.2
Operating Income 1,006.9 550.8 890.7
Other Income (Deductions)      
Interest expense, net (341.1) (370.7) (378.9)
Other, net 40.8 32.1 (5.2)
Loss on early extinguishment of long-term debt 0.0 (243.5) 0.0
Total Other Deductions, Net (300.3) (582.1) (384.1)
Income (Loss) before Income Taxes 706.6 (31.3) 506.6
Income Taxes 117.8 (17.1) 123.5
Net Income (Loss) 588.8 (14.2) 383.1
Net income attributable to noncontrolling interest 3.9 3.4 0.0
Net Income (Loss) attributable to NiSource 584.9 (17.6) 383.1
Preferred dividends (55.1) (55.1) (55.1)
Net Income (Loss) Available to Common Shareholders $ 529.8 $ (72.7) $ 328.0
Earnings Per Share      
Basic Earnings (Loss) Per Share $ 1.35 $ (0.19) $ 0.88
Diluted Earnings (Loss) Per Share $ 1.27 $ (0.19) $ 0.87
Average common shares outstanding - Basic 393,600 384,300 374,600
Diluted Average Common Shares 417,300 384,300 376,000