Statements Of Consolidated Income (Loss) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Operating Revenues
Customer revenues	$ 1,054.1	$ 1,067.2	$ 2,697.1	$ 2,963.3
Other revenues	30.6	22.8	93.9	92.7
Total Operating Revenues	1,084.7	1,090.0	2,791.0	3,056.0
Operating Expenses
Cost of energy	164.7	251.9	589.7	1,017.0
Operation and maintenance	357.7	369.5	736.1	760.7
Depreciation and amortization	253.5	233.1	495.6	440.0
Loss on impairment of assets	2.9	0.0	2.9	0.0
Other taxes	67.3	66.9	144.7	138.7
Operating Costs and Expenses	847.7	921.1	1,970.6	2,356.1
Operating Income	237.0	168.9	820.4	699.9
Other Income (Deductions)
Interest expense, net	(129.3)	(110.5)	(245.6)	(219.4)
Other, net	13.0	2.0	22.2	3.5
Total Other Deductions, Net	(116.3)	(108.5)	(223.4)	(215.9)
Income before Income Taxes	120.7	60.4	597.0	484.0
Income Taxes	17.6	14.1	93.6	99.9
Net Income	103.1	46.3	503.4	384.1
Net income (loss) attributable to noncontrolling interest	17.3		52.6
Net Income Attributable to NiSource	85.8	58.8	450.8	391.8
Preferred Stock Redemption Premium	0.0	(6.2)	(14.0)	(6.2)
Preferred dividends	0.0	(12.7)	(6.7)	(26.5)
Net Income Available to Common Shareholders	$ 85.8	$ 39.9	$ 430.1	$ 359.1
Earnings Per Share
Basic Earnings Per Share	$ 0.19	$ 0.10	$ 0.96	$ 0.87
Diluted Earnings Per Share	$ 0.19	$ 0.09	$ 0.95	$ 0.80
Basic Average Common Shares Outstanding	448.5	413.3	448.2	413.1
Diluted Average Common Shares	450.2	446.8	449.8	446.9
Gain (Loss) on Disposition of Other Assets	$ 1.6	$ (0.3)	$ 1.6	$ (0.3)
Noncontrolling Interest
Other Income (Deductions)
Net income (loss) attributable to noncontrolling interest		(12.5)		(7.7)
Preferred Stock Redemption Premium		$ 0.0	$ 0.0	$ 0.0