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Statements Of Consolidated Income (Loss) - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Revenues      
Customer revenues $ 4,473.2 $ 5,053.4 $ 4,991.1
Other revenues 208.5 155.5 123.4
Total Operating Revenues 4,681.7 5,208.9 5,114.5
Operating Expenses      
Cost of energy 1,109.3 1,534.8 1,761.3
Operation and maintenance 1,585.9 1,354.7 2,352.9
Depreciation and amortization 725.9 717.4 599.6
Impairment of goodwill and intangible assets 0.0 414.5 0.0
Loss on sale of assets, net 410.6 0.0 1.2
Other taxes 299.2 296.8 274.8
Total Operating Expenses 4,130.9 4,318.2 4,989.8
Operating Income (Loss) 550.8 890.7 124.7
Other Income (Deductions)      
Interest expense, net (370.7) (378.9) (353.3)
Other, net 32.1 (5.2) 43.5
Loss on early extinguishment of long-term debt (243.5) 0.0 (45.5)
Total Other Deductions, Net (582.1) (384.1) (355.3)
Income (Loss) before Income Taxes (31.3) 506.6 (230.6)
Income Taxes (17.1) 123.5 (180.0)
Net Income (Loss) (14.2) 383.1 (50.6)
Net Income (Loss) Attributable to Noncontrolling Interest 3.4 0.0 0.0
Net Income (Loss) Attributable to NiSource (17.6) 383.1 (50.6)
Preferred dividends (55.1) (55.1) (15.0)
Net Income (Loss) Available to Common Shareholders $ (72.7) $ 328.0 $ (65.6)
Earnings Per Share      
Basic Earnings (Loss) Per Share $ (0.19) $ 0.88 $ (0.18)
Diluted Earnings (Loss) Per Share $ (0.19) $ 0.87 $ (0.18)
Basic Average Common Shares Outstanding 384,347 374,650 356,491
Diluted Average Common Shares 384,347 375,986 356,491