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Quarterly Financial Data (Schedule Of Quarterly Financial Data) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Data [Abstract]                      
Operating Revenues $ 1,211.0 $ 902.5 $ 962.7 $ 1,605.5 $ 1,397.2 $ 931.5 $ 1,010.4 $ 1,869.8      
Operating Income (Loss) 218.1 92.8 91.7 148.2 (38.0) 91.0 463.5 374.2 $ 550.8 $ 890.7 $ 124.7
Net Income (Loss) 87.8 (172.9) (4.7) 75.6         (14.2) 383.1 (50.6)
Net Income (Loss) Attributable to Noncontrolling Interest 3.4 0.0 0.0 0.0         3.4 0.0 0.0
Net Income (Loss) Attributable to NiSource 84.4 (172.9) (4.7) 75.6 (139.3) 6.6 296.9 218.9 (17.6) 383.1 (50.6)
Preferred Dividends (13.7) (13.8) (13.8) (13.8) (13.7) (13.8) (13.8) (13.8) (55.1) (55.1) (15.0)
Net Income (Loss) Available to Common Stockholders $ 70.7 $ (186.7) $ (18.5) $ 61.8 $ (153.0) $ (7.2) $ 283.1 $ 205.1 $ (72.7) $ 328.0 $ (65.6)
Basic Earnings (Loss) Per Share $ 0.18 $ (0.49) $ (0.05) $ 0.16 $ (0.41) $ (0.02) $ 0.76 $ 0.55 $ (0.19) $ 0.88 $ (0.18)
Diluted Earnings (Loss) Per Share $ 0.18 $ (0.49) $ (0.05) $ 0.16 $ (0.41) $ (0.02) $ 0.75 $ 0.55 $ (0.19) $ 0.87 $ (0.18)