Consolidated Balance Sheets - USD ($) $ in Millions		Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment
Plant		$ 25,171.3	$ 24,179.9
Accumulated depreciation and amortization		(7,289.5)	(7,560.4)
Net Property, Plant and Equipment	[1]	17,881.8	16,619.5
Investments and Other Assets
Unconsolidated affiliates		0.8	0.0
Available-for-sale debt securities (amortized cost of $169.3 and $163.9, allowance for credit losses of $0.2 and $0.5, respectively)		171.8	170.9
Other investments		87.1	81.1
Total Investments and Other Assets		259.7	252.0
Current Assets
Cash and cash equivalents		84.2	116.5
Restricted cash		10.7	9.1
Accounts receivable		849.1	843.6
Allowance for credit losses		(23.5)	(52.3)
Accounts receivable, net		825.6	791.3
Gas inventory		327.4	191.2
Materials and supplies, at average cost		139.1	141.5
Electric production fuel, at average cost		32.2	68.4
Exchange gas receivable		99.6	34.1
Regulatory assets		206.2	135.7
Deferred property taxes		91.0	85.6
Prepayments and other		104.8	86.0
Total Current Assets	[1]	1,920.8	1,659.4
Other Assets
Regulatory assets		2,286.0	1,794.8
Goodwill		1,485.9	1,485.9
Deferred charges and other		322.7	228.9
Total Other Assets		4,094.6	3,509.6
Total Assets		24,156.9	22,040.5
Stockholders' Equity
Common stock - $0.01 par value, 600,000,000 shares authorized; 405,303,023 and 391,760,051 shares outstanding, respectively		4.1	3.9
Preferred stock - $0.01 par value, 20,000,000 shares authorized; 1,302,500 and 440,000 shares outstanding, respectively		1,546.5	880.0
Treasury stock		(99.9)	(99.9)
Additional paid-in capital		7,204.3	6,890.1
Retained deficit		(1,580.9)	(1,765.2)
Accumulated other comprehensive loss		(126.8)	(156.7)
Total NiSource Stockholders' Equity		6,947.3	5,752.2
Noncontrolling interest in consolidated subsidiaries		325.6	85.6
Total Stockholders’ Equity		7,272.9	5,837.8
Long-term debt, excluding amounts due within one year		9,183.4	9,219.8
Total Capitalization		16,456.3	15,057.6
Current Liabilities
Current portion of long-term debt		58.1	23.3
Short-term borrowings		560.0	503.0
Accounts payable		697.8	589.0
Customer deposits and credits		237.9	243.3
Taxes accrued		277.1	244.1
Interest accrued		105.5	104.7
Exchange gas payable		107.7	48.5
Regulatory liabilities		137.4	161.3
Accrued compensation and employee benefits		182.7	141.8
Other accruals		382.0	220.4
Total Current Liabilities		2,746.2	2,279.4
Other Liabilities
Deferred Income Tax Liabilities, Net		1,659.4	1,470.6
Accrued liability for postretirement and postemployment benefits		292.5	336.1
Regulatory liabilities		1,842.6	1,904.2
Asset retirement obligations		469.7	477.1
Other noncurrent liabilities		690.2	515.5
Total Other Liabilities(1)		4,954.4	4,703.5
Total Capitalization and Liabilities		$ 24,156.9	$ 22,040.5

[1] (1)Includes $695.9 million and $175.6 million in 2021 and 2020, respectively, of net property, plant and equipment assets and $14.3 million and $1.7 million in 2021 and 2020, respectively, of current assets of consolidated VIEs that may be used only to settle obligations of the consolidated VIEs. Refer to Note 4, "Variable Interest Entities" for additional information.