NiSource (NI) 10-K 22 Feb 23 2022 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2022	Feb. 15, 2023	Jun. 30, 2022
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2022
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-16189
Entity Registrant Name	NiSource Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	35-2108964
Entity Address, Address Line One	801 East 86th Avenue
Entity Address, City or Town	Merrillville,
Entity Address, State or Province	IN
Entity Address, Postal Zip Code	46410
City Area Code	(877)
Local Phone Number	647-5990
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 11,950,785,429
Entity Common Stock, Shares Outstanding		412,507,944
Entity Central Index Key	0001111711
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Amendment Flag	false
Documents Incorporated by Reference [Text Block]	Part III of this report incorporates by reference specific portions of the Registrant’s Notice of Annual Meeting and Proxy Statement relating to the Annual Meeting of Stockholders to be held on May 23, 2023.
Series A Corporate Units
Document Information [Line Items]
Title of 12(b) Security	Series A Corporate Units
Trading Symbol	NIMC
Security Exchange Name	NYSE
Common Stock
Document Information [Line Items]
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	NI
Security Exchange Name	NYSE
Preferred Stock
Document Information [Line Items]
Title of 12(b) Security	Depositary Shares, each representing a 1/1,000th ownership interest in a share of 6.50% Series B Fixed-Rate Reset Cumulative Redeemable Perpetual
Trading Symbol	NI PR B
Security Exchange Name	NYSE

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2022
Auditor [Line Items]
Auditor Name	DELOITTE & TOUCHE LLP
Auditor Location	Columbus, Ohio
Auditor Firm ID	34

Statements Of Consolidated Inco

Statements Of Consolidated Income (Loss) - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Revenues
Customer revenues	$ 5,738.6	$ 4,731.3	$ 4,473.2
Other revenues	112	168.3	208.5
Total Operating Revenues	5,850.6	4,899.6	4,681.7
Operating Expenses
Cost of energy	2,110.5	1,392.3	1,109.3
Operation and maintenance	1,489.4	1,456	1,585.9
Depreciation and amortization	820.8	748.4	725.9
Loss (gain) on sale of assets, net	(104.2)	7.7	410.6
Other taxes	268.3	288.3	299.2
Total Operating Expenses	4,584.8	3,892.7	4,130.9
Operating Income	1,265.8	1,006.9	550.8
Other Income (Deductions)
Interest expense, net	(361.6)	(341.1)	(370.7)
Other, net	52.2	40.8	32.1
Loss on early extinguishment of long-term debt	0	0	(243.5)
Total Other Deductions, Net	(309.4)	(300.3)	(582.1)
Income (Loss) before Income Taxes	956.4	706.6	(31.3)
Income Taxes	164.6	117.8	(17.1)
Net Income (Loss)	791.8	588.8	(14.2)
Net income (loss) attributable to noncontrolling interest	(12.3)	3.9	3.4
Net Income (Loss) attributable to NiSource	804.1	584.9	(17.6)
Preferred dividends	(55.1)	(55.1)	(55.1)
Net Income (Loss) Available to Common Shareholders	$ 749	$ 529.8	$ (72.7)
Earnings Per Share
Basic Earnings (Loss) Per Share	$ 1.84	$ 1.35	$ (0.19)
Diluted Earnings (Loss) Per Share	$ 1.70	$ 1.27	$ (0.19)
Average common shares outstanding - Basic	407,100	393,600	384,300
Diluted Average Common Shares	442,700	417,300	384,300

Statements of Consolidated Comp

Statements of Consolidated Comprehensive Income (Loss) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net Income (Loss)		$ 791.8	$ 588.8	$ (14.2)
Other comprehensive income (loss):
Net unrealized gain (loss) on available-for-sale securities	[1]	(13.3)	(3.9)	2.7
Net unrealized gain (loss) on cash flow hedges	[2]	109.9	25.4	(70.7)
Unrecognized pension and OPEB benefit (costs)	[3]	(6.9)	8.4	3.9
Total other comprehensive income (loss)		89.7	29.9	(64.1)
Total Comprehensive Income (Loss)		$ 881.5	$ 618.7	$ (78.3)
[1]Net unrealized gain (loss) on available-for-sale securities, net of $3.5 million tax benefit, $1.0 million tax benefit and $0.7 million tax expense in 2022, 2021 and 2020, respectively.[2]Net unrealized gain (loss) on derivatives qualifying as cash flow hedges, net of $36.4 million tax expense, $8.4 million tax expense and $23.4 million tax benefit in 2022, 2021 and 2020, respectively.[3]Unrecognized pension and OPEB benefit (costs), net of $2.3 million tax benefit, $3.8 million tax expense and $0.1 million tax benefit in 2022, 2021 and 2020, respectively.

Statements of Consolidated Co_2

Statements of Consolidated Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax	$ 3.5	$ 1	$ (0.7)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax, Parent	(36.4)	(8.4)	23.4
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	$ 2.3	$ (3.8)	$ 0.1

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment
Plant		$ 27,551.3	$ 25,171.3
Accumulated depreciation and amortization		(7,708.7)	(7,289.5)
Net Property, Plant and Equipment	[1]	19,842.6	17,881.8
Investments and Other Assets
Unconsolidated affiliates		1.6	0.8
Available-for-sale debt securities (amortized cost of $166.7 and $169.3, allowance for credit losses of $0.9 and $0.2, respectively)		151.6	171.8
Other investments		71	87.1
Total Investments and Other Assets		224.2	259.7
Current Assets
Cash and cash equivalents		40.8	84.2
Restricted cash		34.6	10.7
Accounts receivable		1,065.8	849.1
Allowance for credit losses		(23.9)	(23.5)
Accounts receivable, net		1,041.9	825.6
Gas inventory		531.7	327.4
Materials and supplies, at average cost		151.4	139.1
Electric production fuel, at average cost		68.8	32.2
Exchange gas receivable		128.1	99.6
Regulatory assets		233.2	206.2
Deposits to renewable generation asset developer		143.8	0
Prepayments and other		210	195.8
Total Current Assets	[1]	2,584.3	1,920.8
Other Assets
Regulatory assets		2,347.6	2,286
Goodwill		1,485.9	1,485.9
Deferred charges and other		252	322.7
Total Other Assets		4,085.5	4,094.6
Total Assets		26,736.6	24,156.9
Stockholders' Equity
Common stock - $0.01 par value, 600,000,000 shares authorized; 412,142,602 and 405,303,023 shares outstanding, respectively		4.2	4.1
Preferred stock - $0.01 par value, 20,000,000 shares authorized; 1,302,500 and 1,302,500 shares outstanding, respectively		1,546.5	1,546.5
Treasury stock		(99.9)	(99.9)
Additional paid-in capital		7,375.3	7,204.3
Retained deficit		(1,213.6)	(1,580.9)
Accumulated other comprehensive loss		(37.1)	(126.8)
Total NiSource Stockholders' Equity		7,575.4	6,947.3
Noncontrolling interest in consolidated subsidiaries		326.4	325.6
Total Stockholders’ Equity		7,901.8	7,272.9
Long-term debt, excluding amounts due within one year		9,523.6	9,183.4
Total Capitalization		17,425.4	16,456.3
Current Liabilities
Current portion of long-term debt		30	58.1
Short-term borrowings		1,761.9	560
Accounts payable		899.5	697.8
Customer deposits and credits		324.7	237.9
Taxes accrued		246.2	277.1
Interest accrued		138.4	105.5
Exchange gas payable		147.6	107.7
Regulatory liabilities		236.8	137.4
Accrued compensation and employee benefits		167.5	182.7
Other accruals		360.7	382
Total Current Liabilities		4,660.5	2,746.2
Other Liabilities
Deferred Income Tax Liabilities, Net		1,854.5	1,659.4
Accrued liability for postretirement and postemployment benefits		245.5	292.5
Regulatory liabilities		1,775.8	1,842.6
Asset retirement obligations		478.1	469.7
Other noncurrent liabilities		296.8	690.2
Total Other Liabilities(1)		4,650.7	4,954.4
Total Capitalization and Liabilities		26,736.6	24,156.9
Obligations to renewable generation asset developer		$ 347.2	$ 0
[1] (1) Includes $978.5 million and $695.9 million in 2022 and 2021, respectively, of net property, plant and equipment assets and $25.7 million and $14.3 million in 2022 and 2021, 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.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Amortized Cost		$ 166.7	$ 169.3
Allowance for Credit Loss		(0.9)	0.2
Net Property, Plant and Equipment	[1]	19,842.6	17,881.8
Current assets	[1]	$ 2,584.3	$ 1,920.8
Common stock, par value		$ 0.01	$ 0.01
Common stock, shares authorized		600,000,000	600,000,000
Common stock, shares outstanding		412,142,602	405,303,023
Preferred Stock, Par or Stated Value Per Share		$ 0.01	$ 0.01
Preferred Stock, Shares Authorized		20,000,000	20,000,000
Preferred Stock, Shares Outstanding		1,302,500	1,302,500
Current liabilities		$ 4,660.5	$ 2,746.2
Liabilities, Noncurrent		4,650.7	4,954.4
Deposits to renewable generation asset developer		143.8	0
Obligations to renewable generation asset developer		347.2	0
Consolidated Variable Interest Entities
Net Property, Plant and Equipment		978.5	695.9
Current assets		25.7	14.3
Current liabilities		128.2	10
Liabilities, Noncurrent		$ 30.6	$ 20.5
[1] (1) Includes $978.5 million and $695.9 million in 2022 and 2021, respectively, of net property, plant and equipment assets and $25.7 million and $14.3 million in 2022 and 2021, 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.

Statements Of Consolidated Cash

Statements Of Consolidated Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Activities
Net Income (Loss)	$ 791.8	$ 588.8	$ (14.2)
Adjustments to Reconcile Net Income to Net Cash from Operating Activities:
Loss on early extinguishment of debt	0	0	243.5
Depreciation and amortization	820.8	748.4	725.9
Deferred income taxes and investment tax credits	156.9	111.9	(29)
Stock compensation expense and 401(k) profit sharing contribution	24.9	24.3	17.4
Loss (gain) on sale of assets	(105.3)	5.6	409.8
Other adjustments	5.7	(0.7)	(0.3)
Changes in Assets and Liabilities:
Accounts receivable	(216.3)	(40.3)	(3.9)
Inventories	(258.9)	(112.9)	(1.5)
Accounts payable	165	54.9	(29.7)
Exchange gas receivable/payable	57.8	(114.2)	(6.9)
Other accruals	73.4	43	(175.1)
Prepayments and other current assets	(9.8)	(36.6)	(5.9)
Regulatory assets/liabilities	(129.4)	76.8	70.8
Postretirement and postemployment benefits	84.7	(96.4)	(103.6)
Deferred charges and other noncurrent assets	(4.1)	(4.7)	(15)
Other noncurrent liabilities and deferred credits	(47.8)	(30)	21.7
Net Cash Flows from Operating Activities	1,409.4	1,217.9	1,104
Investing Activities
Capital expenditures	(2,203.1)	(1,838)	(1,758.1)
Proceeds from Insurance Settlement, Investing Activities	105	0	0
Cost of removal	(151.7)	(121.1)	(138.2)
Proceeds from disposition of assets	0	0.7	1,115.9
Purchases of available-for-sale securities	(73.5)	(102.9)	(144.7)
Sales of available-for-sale securities	75.7	97.8	131.4
Payment to renewable generation asset developer	(323.9)	(240.4)	(85.3)
Other investing activities	1.3	(1)	(0.1)
Net Cash Flows used for Investing Activities	(2,570.2)	(2,204.9)	(879.1)
Financing Activities
Proceeds from issuance of long-term debt	345.6	0	2,974
Repayments of long-term debt and finance lease obligations	(60.3)	(25.7)	(1,622)
Issuance of short-term debt (maturity > 90 days)	1,000	0	1,350
Repayment of short-term debt (maturity > 90 days)	0	0	(2,200)
Change in short-term debt (maturity ≤ 90 days)	202.2	57	(420.1)
Issuance of common stock, net of issuance costs	154.3	299.6	211.4
Equity costs, premiums and other debt related costs	(13)	(18.2)	(246.5)
Contributions from noncontrolling interest	21.2	245.1	82.2
Distributions to noncontrolling interest	(6)	(0.6)	0
Issuance of equity units, net of underwriting costs	0	839.9	0
Dividends paid - common stock	(381.5)	(345.2)	(321.6)
Dividends paid - preferred stock	(55.1)	(55.1)	(55.1)
Contract liability payment	(66.1)	(40.5)	0
Net Cash Flows from (used for) Financing Activities	1,141.3	956.3	(247.7)
Change in cash, cash equivalents and restricted cash	(19.5)	(30.7)	(22.8)
Cash, cash equivalents and restricted cash at beginning of period	94.9	125.6	148.4
Cash, Cash Equivalents and Restricted Cash at End of Period	$ 75.4	$ 94.9	$ 125.6

Statements Of Consolidated Ca_2

Statements Of Consolidated Cash Flows (Schedule of Balance Sheet Reconciliation) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash and Cash Equivalents, at Carrying Value	$ 40.8	$ 84.2	$ 116.5
Restricted cash	34.6	10.7	9.1
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 75.4	$ 94.9	$ 125.6	$ 148.4

Statements Of Consolidated Stoc

Statements Of Consolidated Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock	Preferred Stock		Treasury Stock	Additional Paid-in Capital	Retained Deficit	Accumulated Other Comprehensive Loss	Noncontrolling Interest in Consolidated Subsidiaries
Beginning Balance at Dec. 31, 2019	$ 5,986.7	$ 3.8	$ 880	[1]	$ (99.9)	$ 6,666.2	$ (1,370.8)	$ (92.6)	$ 0
Comprehensive Income (Loss):
Net Income (Loss)	(14.2)	0	0	[1]	0	0	(17.6)	0	3.4
Other Comprehensive Income (Loss), Net of Tax	(64.1)	0	0	[1]	0	0	0	(64.1)	0
Dividends:
Common stock	(321.7)	0	0	[1]	0	0	(321.7)	0	0
Preferred stock	(55.1)	0	0	[1]	0	0	(55.1)	0	0
Contribution from noncontrolling interest	82.2	0	0		0	0	0	0	82.2
Stock issuances:
Employee stock purchase plan	5.7	0	0	[1]	0	5.7	0	0	0
Long-term incentive plan	8.4	0	0	[1]	0	8.4	0	0	0
401(k) and profit sharing	13.4	0	0	[1]	0	13.4	0	0	0
ATM Program	196.5	0.1	0	[1]	0	196.4	0	0	0
Ending Balance at Dec. 31, 2020	5,837.8	3.9	880	[1]	(99.9)	6,890.1	(1,765.2)	(156.7)	85.6
Comprehensive Income (Loss):
Net Income (Loss)	588.8	0	0	[1]	0	0	584.9	0	3.9
Other Comprehensive Income (Loss), Net of Tax	29.9	0	0	[1]	0	0	0	29.9	0
Dividends:
Common stock	(345.5)	0	0	[1]	0	0	(345.5)	0	0
Preferred stock	(55.1)	0	0	[1]	0	0	(55.1)	0	0
Contribution from noncontrolling interest	236.7	0	0	[1]	0	0	0	0	236.7
Distributions to Noncontrolling Interest Holders	(0.6)	0	0		0	0	0	0	(0.6)
Stock issuances:
Equity Units	666.5	0	666.5	[1]	0	0	0	0	0
Employee stock purchase plan	5	0	0	[1]	0	5	0	0	0
Long-term incentive plan	11.8	0	0	[1]	0	11.8	0	0	0
401(k) and profit sharing	9.5	0	0	[1]	0	9.5	0	0	0
ATM Program	288.1	0.2	0	[1]	0	287.9	0	0	0
Ending Balance at Dec. 31, 2021	7,272.9	4.1	1,546.5	[1]	(99.9)	7,204.3	(1,580.9)	(126.8)	325.6
Comprehensive Income (Loss):
Net Income (Loss)	791.8	0	0	[1]	0	0	804.1	0	(12.3)
Other Comprehensive Income (Loss), Net of Tax	89.7	0	0	[1]	0	0	0	89.7	0
Dividends:
Common stock	(381.7)	0	0	[1]	0	0	(381.7)	0	0
Preferred stock	(55.1)	0	0	[1]	0	0	(55.1)	0	0
Contribution from noncontrolling interest	19.1	0	0	[1]	0	0	0	0	19.1
Distributions to Noncontrolling Interest Holders	(6)	0	0	[1]	0	0	0	0	(6)
Stock issuances:
Employee stock purchase plan	5.2	0	0	[1]	0	5.2	0	0	0
Long-term incentive plan	14.3	0	0	[1]	0	14.3	0	0	0
401(k) and profit sharing	9.7	0	0	[1]	0	9.7	0	0	0
ATM Program	141.9	0.1	0	[1]	0	141.8	0	0	0
Ending Balance at Dec. 31, 2022	$ 7,901.8	$ 4.2	$ 1,546.5	[1]	$ (99.9)	$ 7,375.3	$ (1,213.6)	$ (37.1)	$ 326.4
[1]Series A, Series B, and Series C shares have an aggregate liquidation preference of $400M, $500M, and $863M, respectively. See Note 13, "Equity," for additional information.

Statements Of Consolidated St_2

Statements Of Consolidated Stockholders' Equity (Shares) - shares shares in Thousands	Total	Common Stock	Treasury Stock	Preferred Stock
Beginning Balance at Dec. 31, 2019	382,136	386,099	3,963	440
Issued:
Employee stock purchase plan	236	236	0	0
Long-term incentive plan	385	385	0	0
401(k) and profit sharing plan	544	544	0	0
ATM Program	8,459	8,459	0	0
Ending Balance at Dec. 31, 2020	391,760	395,723	3,963	440
Issued:
Equity Units	0	0	0	(863)
Employee stock purchase plan	209	209	0	0
Long-term incentive plan	418	418	0	0
401(k) and profit sharing plan	391	391	0	0
ATM Program	12,525	12,525	0	0
Ending Balance at Dec. 31, 2021	405,303	409,266	3,963	1,303
Issued:
Employee stock purchase plan	186	186	0	0
Long-term incentive plan	375	375	0	0
401(k) and profit sharing plan	337	337	0	0
ATM Program	5,942	5,942	0	0
Ending Balance at Dec. 31, 2022	412,143	416,106	3,963	1,303

Statements of Consolidated St_3

Statements of Consolidated Stockholders' Equity (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Common Stock, Dividends, Per Share, Declared	$ 0.94	$ 0.88	$ 0.84
Series A Preferred Stock
Preferred Stock, Liquidation Preference, Value	$ 400	$ 400	$ 400
Series B Preferred Stock
Preferred Stock, Liquidation Preference, Value	500	$ 500	$ 500
Series C Preferred Stock
Preferred Stock, Liquidation Preference, Value	$ 863

Nature of Operations And Summar

Nature of Operations And Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations and Summary of Significant Accounting Policies	A. Company Structure and Principles of Consolidation. We are an energy holding company incorporated in Delaware and headquartered in Merrillville, Indiana. Our subsidiaries are fully regulated natural gas and electric utility companies serving approximately 3.7 million customers in six states. We generate substantially all of our operating income through these rate-regulated businesses. The consolidated financial statements include the accounts of us, our majority-owned subsidiaries, and VIEs of which we are the primary beneficiary after the elimination of all intercompany accounts and transactions. B. Use of Estimates. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. C. Cash, Cash Equivalents and Restricted Cash. We consider all highly liquid investments with original maturities of three months or less to be cash equivalents. We report amounts deposited in brokerage accounts for margin requirements as restricted cash. In addition, we have amounts deposited in trusts to satisfy requirements for the provision of various property, liability, workers compensation, and long-term disability insurance, which is classified as restricted cash on the Consolidated Balance Sheets and disclosed with cash and cash equivalents on the Statements of Consolidated Cash Flows. D. Accounts Receivable and Unbilled Revenue. Accounts receivable on the Consolidated Balance Sheets includes both billed and unbilled amounts. Unbilled amounts of accounts receivable relate to a portion of a customer’s consumption of gas or electricity from the last cycle billing date through the last day of the month (balance sheet date). Factors taken into consideration when estimating unbilled revenue include historical usage, customer rates, weather and reasonable and supportable forecasts. Accounts receivable fluctuates from year to year depending in large part on weather impacts and price volatility. Our accounts receivable on the Consolidated Balance Sheets include unbilled revenue, less reserves. The reserve for uncollectible receivables is our best estimate of the amount of probable credit losses in the existing accounts receivable. We determined the reserve based on historical collection experience, current market conditions and reasonable and supportable forecasts. Account balances are charged against the allowance when it is anticipated the receivable will not be recovered. Refer to Note 3, "Revenue Recognition," for additional information on customer-related accounts receivable, including amounts related to unbilled revenues. E. Investments in Debt Securities. Our investments in debt securities are carried at fair value and are designated as available-for-sale. These investments are included within “Available-for-sale debt securities” on the Consolidated Balance Sheets. Unrealized gains and losses, net of deferred income taxes, are recorded to accumulated other comprehensive income or loss. At each reporting period these investments are qualitatively and quantitatively assessed to determine whether a decline in fair value below the amortized cost basis has resulted from a credit loss or other factors. Impairments related to credit loss are recorded through an allowance for credit losses. Impairments that are not related to credit losses are included in other comprehensive income and are reflected in the Statements of Consolidated Income (Loss). No material impairment charges were recorded for the years ended December 31, 2022, 2021 or 2020. Refer to Note 18, "Fair Value," for additional information. F. Basis of Accounting for Rate-Regulated Subsidiaries. Rate-regulated subsidiaries account for and report assets and liabilities consistent with the economic effect of the way in which regulators establish rates, if the rates established are designed to recover the costs of providing the regulated service and it is probable that such rates can be charged and collected. Certain expenses and credits subject to utility regulation or rate determination normally reflected in income are deferred on the Consolidated Balance Sheets and are later recognized in income as the related amounts are included in customer rates and recovered from or refunded to customers. We continually evaluate whether or not our operations are within the scope of ASC 980 and rate regulations. As part of that analysis, we evaluate probability of recovery for our regulatory assets. In management’s opinion, our regulated subsidiaries will be subject to regulatory accounting for the foreseeable future. Refer to Note 9, "Regulatory Matters," for additional information. G. Plant and Other Property and Related Depreciation and Maintenance. Property, plant and equipment (principally utility plant) is stated at cost. Our rate-regulated subsidiaries record depreciation using composite rates on a straight-line basis over the remaining service lives of the electric, gas and common properties, as approved by the appropriate regulators. Non-utility property includes renewable generation assets owned by JVs of which we are the primary beneficiary and is generally depreciated on a straight-line basis over the life of the associated assets. Refer to Note 6, "Property, Plant and Equipment," for additional information related to depreciation expense. For rate-regulated companies where provided for in rates, AFUDC is capitalized on all classes of property except organization costs, land, autos, office equipment, tools and other general property purchases. The allowance is applied to construction costs for that period of time between the date of the expenditure and the date on which such project is placed in service. Our consolidated pre-tax rate for AFUDC was 3.4% in 2022, 3.3% in 2021 and 2.6% in 2020. Generally, our subsidiaries follow the practice of charging maintenance and repairs, including the cost of removal of minor items of property, to expense as incurred. When our subsidiaries retire regulated property, plant and equipment, original cost plus the cost of retirement, less salvage value, is charged to accumulated depreciation. However, when it becomes probable a regulated asset will be retired substantially in advance of its original expected useful life or is abandoned, the cost of the asset and the corresponding accumulated depreciation is recognized as a separate asset. If the asset is still in operation, the gross amounts are classified as "Non-Utility and Other " as described in Note 6, "Property, Plant and Equipment." If the asset is no longer operating but still subject to recovery, the net amount is classified in "Regulatory assets" on the Consolidated Balance Sheets. If we are able to recover a full return of and on investment, the carrying value of the asset is based on historical cost. If we are not able to recover a full return on investment, a loss on impairment is recognized to the extent the net book value of the asset exceeds the present value of future revenues discounted at the incremental borrowing rate. External and internal costs associated with on-premise computer software developed for internal use are capitalized. Capitalization of such costs commences upon the completion of the preliminary stage of each project. Once the installed software is ready for its intended use, such capitalized costs are amortized on a straight-line basis generally over a period of five years. External and internal up-front implementation costs associated with cloud computing arrangements that are service contracts are deferred on the Consolidated Balance Sheets. Once the installed software is ready for its intended use, such deferred costs are amortized on a straight-line basis to "Operation and maintenance," over the minimum term of the contract plus contractually-provided renewal periods that are reasonable, expected to be exercised. H. Goodwill and Other Intangible Assets. Substantially all of our goodwill relates to the excess of cost over the fair value of the net assets acquired in the Columbia acquisition on November 1, 2000. We test our goodwill for impairment annually as of May 1, or more frequently if events and circumstances indicate that goodwill might be impaired. Fair value of our reporting units is determined using a combination of income and market approaches. See Note 7, "Goodwill," for additional information. I. Accounts Receivable Transfer Programs. Certain of our subsidiaries have agreements with third parties to transfer certain accounts receivable without recourse. These transfers of accounts receivable are accounted for as secured borrowings. The entire gross receivables balance remains on the December 31, 2022 and 2021 Consolidated Balance Sheets. When amounts are securitized, the short-term debt is recorded in the amount of proceeds received from the transferees involved in the transactions. Refer to Note 16, "Short-Term Borrowings," for further information. J. Gas Cost and Fuel Adjustment Clause. Our regulated subsidiaries defer most differences between gas and fuel purchase costs and the recovery of such costs in revenues and adjust future billings for such deferrals on a basis consistent with applicable state-approved tariff provisions. These deferred balances are recorded as "Regulatory assets" or "Regulatory liabilities," as appropriate, on the Consolidated Balance Sheets. Refer to Note 9, "Regulatory Matters," for additional information. K. Inventory. Both the LIFO inventory methodology and the weighted average cost methodology are used to value natural gas in storage, as approved by regulators for all of our regulated subsidiaries. Inventory valued using LIFO was $43.0 million and $44.9 million at December 31, 2022 and 2021, respectively. Based on the average cost of gas using the LIFO method, the estimated replacement cost of gas in storage was greater than the stated LIFO cost by $7.7 million at December 31, 2022 and was less than the stated LIFO cost by $13.6 million at December 31, 2021. As all LIFO inventory costs are collected from customers through our rate-regulated subsidiaries, no inventory impairment has been recorded. Gas inventory valued using the weighted average cost methodology was $488.7 million at December 31, 2022 and $282.4 million at December 31, 2021. Electric production fuel is valued using the weighted average cost inventory methodology, as approved by NIPSCO's regulator. Materials and supplies are valued using the weighted average cost inventory methodology. L. Accounting for Exchange and Balancing Arrangements of Natural Gas. Our Gas Distribution Operations segment enters into balancing and exchange arrangements of natural gas as part of its operations and off-system sales programs. We record a receivable or payable for any of our respective cumulative gas imbalances, as well as for any gas inventory borrowed or lent under a Gas Distribution Operations exchange agreement. Exchange gas is valued based on individual regulatory jurisdiction requirements (for example, historical spot rate, spot at the beginning of the month). These receivables and payables are recorded as “Exchange gas receivable” or “Exchange gas payable” on our Consolidated Balance Sheets, as appropriate. M. Accounting for Risk Management Activities. We account for our derivatives and hedging activities in accordance with ASC 815. We recognize all derivatives as either assets or liabilities on the Consolidated Balance Sheets at fair value, unless such contracts are exempted as a normal purchase normal sale under the provisions of the standard. The accounting for changes in the fair value of a derivative depends on the intended use of the derivative and resulting designation. We do not offset the fair value amounts recognized for any of our derivative instruments against the fair value amounts recognized for the right to reclaim cash collateral or obligation to return cash collateral for derivative instruments executed with the same counterparty under a master netting arrangement. See Note 10, "Risk Management Activities," for additional information. N. Income Taxes and Investment Tax Credits. We record income taxes to recognize full interperiod tax allocations. Under the asset and liability method, deferred income taxes are provided for the tax consequences of temporary differences by applying enacted statutory tax rates applicable to future years to differences between the financial statement carrying amount and the tax basis of existing assets and liabilities. Investment tax credits associated with regulated operations are deferred and amortized as a reduction to income tax expense over the estimated useful lives of the related properties. To the extent certain deferred income taxes of the regulated companies are recoverable or payable through future rates, regulatory assets and liabilities have been established. Regulatory assets for income taxes are primarily attributable to property-related tax timing differences for which deferred taxes had not been provided in the past when regulators did not recognize such taxes as costs in the rate-making process. Regulatory liabilities for income taxes are primarily attributable to the regulated companies’ obligation to refund to ratepayers deferred income taxes provided at rates higher than the current Federal income tax rate. Such property-related amounts are credited to ratepayers using either the average rate assumption method or the reverse South Georgia method. Non property-related amounts are credited to ratepayers consistent with state utility commission direction. Pursuant to the Internal Revenue Code and relevant state taxing authorities, we and our subsidiaries file consolidated income tax returns for federal and certain state jurisdictions. We and our subsidiaries are parties to a tax sharing agreement. Income taxes recorded by each party represent amounts that would be owed had the party been separately subject to tax. O. Pension Remeasurement. We utilize a third-party actuary for the purpose of performing actuarial valuations of our defined benefit plans. Annually, as of December 31, we perform a remeasurement for our pension plans. Quarterly, we monitor for significant events, and if a significant event is identified, we perform a qualitative and quantitative assessment to determine if the resulting remeasurement would materially impact the NiSource financial statements. If material, an interim remeasurement is performed. We had one such interim remeasurement in the second quarter of 2022. See Note 12, "Pension and Other Postemployment Benefits," for additional information. P. Environmental Expenditures. We accrue for costs associated with environmental remediation obligations, including expenditures related to asset retirement obligations and cost of removal, when the incurrence of such costs is probable and the amounts can be reasonably estimated, regardless of when the expenditures are actually made. The undiscounted estimated future expenditures are based on currently enacted laws and regulations, existing technology and estimated site-specific costs where assumptions may be made about the nature and extent of site contamination, the extent of cleanup efforts, costs of alternative cleanup methods and other variables. The liability is adjusted as further information is discovered or circumstances change. The accruals for estimated environmental expenditures are recorded on the Consolidated Balance Sheets in “Other accruals” for short-term portions of these liabilities and “Other noncurrent liabilities” for the respective long-term portions of these liabilities. Rate-regulated subsidiaries applying regulatory accounting establish regulatory assets on the Consolidated Balance Sheets to the extent that future recovery of environmental remediation costs is probable through the regulatory process. Refer to Note 8, "Asset Retirement Obligations," and Note 19, "Other Commitments and Contingencies," for further information. Q. Excise Taxes. As an agent for some state and local governments, we invoice and collect certain excise taxes levied by state and local governments on customers and record these amounts as liabilities payable to the applicable taxing jurisdiction. Such balances are presented within "Other accruals" on the Consolidated Balance Sheets. These types of taxes collected from customers, comprised largely of sales taxes, are presented on a net basis affecting neither revenues nor cost of sales. We account for excise taxes for which we are liable by recording a liability for the expected tax with a corresponding charge to “Other taxes” expense on the Statements of Consolidated Income (Loss). R. Accrued Insurance Liabilities. We accrue for insurance costs related to workers compensation, automobile, property, general and employment practices liabilities based on the most probable value of each claim. In general, claim values are determined by professional, licensed loss adjusters who consider the facts of the claim, anticipated indemnification and legal expenses, and respective state rules. Claims are reviewed by us at least quarterly and an adjustment is made to the accrual based on the most current information. S. VIEs and Allocation of Earnings. We fund a significant portion of our renewable generation assets through JVs with tax equity partners. We consolidate these JVs in accordance with ASC 810 as they are VIEs in which we hold a variable interest, and we control decisions that are significant to the JVs' ongoing operations and economic results (i.e., we are the primary beneficiary). These JVs are subject to profit sharing arrangements in which the allocation of the JVs' cash distributions and tax benefits to members is based on factors other than members' relative ownership percentages. As such, we utilize the HLBV method to allocate proceeds to each partner at the balance sheet date based on the liquidation provisions of the related JV's operating agreement and adjusts the amount of the VIE's net income attributable to us and the noncontrolling tax equity member during the period. In each reporting period, the application of HLBV to our consolidated VIEs results in a difference between the amount of profit from the consolidated JVs and the amount included in regulated rates. As discussed above in "F. Basis of Accounting for Rate-Regulated Subsidiaries," we are subject to the accounting and reporting requirements of ASC 980. In accordance with these principles, we recognize a regulatory liability or asset for amounts representing the timing difference between the profit earned from the JVs and the amount included in regulated rates to recover our approved investments in consolidated JVs. The amounts recorded in income will ultimately reflect the amount allowed in regulated rates to recover our investments over the useful life of the projects. The offset to the regulatory liability or asset associated with our renewable investments included in regulated rates is recorded in "Depreciation expense" on the Statements of Consolidated Income (Loss).

Recent Accounting Pronouncement

Recent Accounting Pronouncements	12 Months Ended
	Dec. 31, 2022
Accounting Standards Update and Change in Accounting Principle [Abstract]
Recent Accounting Pronouncements	Recently Issued Accounting Pronouncements We have evaluated recently issued accounting pronouncements and do not believe any pronouncements will have a significant impact on our Consolidated Financial Statements or Notes to the Consolidated Financial Statements. Recently Adopted Accounting Pronouncements In March 2020, the FASB issued ASU 2020-04 Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting and in January 2021, the FASB issued ASU 2021-01 Reference Rate Reform (Topic 848): Scope. These pronouncements provide temporary optional expedients and exceptions for applying GAAP principles to contract modifications and hedging relationships to ease the financial reporting burdens of the expected market transition from LIBOR and other interbank offered rates to alternative reference rates. These pronouncements were effective upon issuance on March 12, 2020 through December 31, 2022. In December 2022, the FASB issued ASU 2022-06, Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848 , to extend the temporary accounting rules under Topic 848 from December 31, 2022 to December 31, 2024, after which entities will no longer be permitted to apply the relief in Topic 848. During the third quarter of 2022, the company applied the practical expedient under Topic 848 which allowed for the continuation of cash flow hedge accounting for interest rate derivative contracts upon the transition from LIBOR to alternative reference rates. The application of this expedient had no material impact on the Consolidated Financial Statements. In November 2021, the FASB issued ASU 2021-10 Government Assistance (Topic 832): Disclosures by Business Entities about Government Assistance . This pronouncement requires certain annual disclosures for transactions with a government that are accounted for by applying a grant or contribution accounting model by analogy to other accounting guidance. This pronouncement is effective for financial statements issued for annual periods beginning after December 15, 2021. The company adopted this pronouncement in the fourth quarter of 2022. The adoption of this pronouncement did not have an impact on the Notes to the Consolidated Financial Statements. In September 2022, the FASB issued ASU 2022-04 Liabilities-Supplier Finance Programs (Topic 405-50) - Disclosure of Supplier Finance Program Obligations . This pronouncement requires that a buyer in a supplier finance program disclose sufficient information to allow a user of financial statements to understand the program’s nature, activity during the period, changes from period to period, and potential magnitude. This pronouncement is expected to improve financial reporting by requiring new disclosures about supplier finance programs, thereby allowing financial statement users to better consider the effect of such programs on an entity’s working capital, liquidity, and cash flows. This pronouncement is effective for fiscal years beginning after December 15, 2022. The company adopted this pronouncement as of January 1, 2023. We had no active supplier finance programs as of December 31, 2022.

Revenue Recognition

Revenue Recognition	12 Months Ended
	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer	Customer Revenues. Substantially all of our revenues are tariff-based. Under ASC 606, the recipients of our utility service meet the definition of a customer, while the operating company tariffs represent an agreement that meets the definition of a contract, which creates enforceable rights and obligations. Customers in certain of our jurisdictions participate in programs that allow for a fixed payment each month regardless of usage. Payments received that exceed the value of gas or electricity actually delivered are recorded as a liability and presented in "Customer Deposits and Credits" on the Consolidated Balance Sheets. Amounts in this account are reduced and revenue is recorded when customer usage exceeds payments received. We have identified our performance obligations created under tariff-based sales as 1) the commodity (natural gas or electricity, which includes generation and capacity) and 2) delivery. These commodities are sold and / or delivered to and generally consumed by customers simultaneously, leading to satisfaction of our performance obligations over time as gas or electricity is delivered to customers. Due to the at-will nature of utility customers, performance obligations are limited to the services requested and received to date. Once complete, we generally maintain no additional performance obligations. Transaction prices for each performance obligation are generally prescribed by each operating company’s respective tariff. Rates include provisions to adjust billings for fluctuations in fuel and purchased power costs and cost of natural gas. Revenues are adjusted for differences between actual costs, subject to reconciliation, and the amounts billed in current rates. Under or over recovered revenues related to these cost recovery mechanisms are included in "Regulatory Assets" or "Regulatory Liabilities" on the Consolidated Balance Sheets and are recovered from or returned to customers through adjustments to tariff rates. As we provide and deliver service to customers, revenue is recognized based on the transaction price allocated to each performance obligation. Distribution revenues are generally considered daily or "at-will" contracts as customers may cancel their service at any time (subject to notification requirements), and revenue generally represents the amount we are entitled to bill customers. In addition to tariff-based sales, our Gas Distribution Operations segment enters into balancing and exchange arrangements of natural gas as part of our operations and off-system sales programs. Performance obligations for these types of sales include transportation and storage of natural gas and can be satisfied at a point in time or over a period of time, depending on the specific transaction. For those transactions that span a period of time, we record a receivable or payable for any cumulative gas imbalances, as well as for any gas inventory borrowed or lent under a Gas Distributions Operations exchange agreement. Revenue Disaggregation and Reconciliation. We disaggregate revenue from contracts with customers based upon reportable segment as well as by customer class. The tables below reconcile revenue disaggregation by customer class to segment revenue, as well as to revenues reflected on the Statements of Consolidated Income (Loss): Year Ended December 31, 2022 (in millions) Gas Distribution Operations Electric Operations Corporate and Other (2) Total Customer Revenues (1) Residential $ 2,609.7 $ 592.4 $ — $ 3,202.1 Commercial 939.6 571.0 — 1,510.6 Industrial 220.6 560.6 — 781.2 Off-system 192.9 — — 192.9 Miscellaneous 40.3 11.5 — 51.8 Total Customer Revenues $ 4,003.1 $ 1,735.5 $ — $ 5,738.6 Other Revenues 4.1 95.4 12.5 112.0 Total Operating Revenues $ 4,007.2 $ 1,830.9 $ 12.5 $ 5,850.6 (1) Customer revenue amounts exclude intersegment revenues. See Note 21, "Business Segment Information," for discussion of intersegment revenues. (2) Other revenues related to the Transition Services Agreement entered into in connection with the sale of the Massachusetts Business, which was substantially completed as of June 30, 2022. Year Ended December 31, 2021 (in millions) Gas Distribution Operations Electric Operations Corporate and Other (2) Total Customer Revenues (1) Residential $ 2,109.4 $ 567.9 $ — $ 2,677.3 Commercial 722.4 534.9 — 1,257.3 Industrial 195.7 493.4 — 689.1 Off-system 71.3 — — 71.3 Miscellaneous 27.3 8.2 0.8 36.3 Total Customer Revenues $ 3,126.1 $ 1,604.4 $ 0.8 $ 4,731.3 Other Revenues 45.1 91.9 31.3 168.3 Total Operating Revenues $ 3,171.2 $ 1,696.3 $ 32.1 $ 4,899.6 (1) Customer revenue amounts exclude intersegment revenues. See Note 21, "Business Segment Information," for discussion of intersegment revenues. (2) Other revenues related to the Transition Services Agreement entered into in connection with the sale of the Massachusetts Business. Year Ended December 31, 2020 (in millions) Gas Distribution Operations Electric Operations Corporate and Other (2) Total Customer Revenues (1) Residential $ 2,075.0 $ 527.8 $ — $ 2,602.8 Commercial 670.5 480.3 — 1,150.8 Industrial 212.8 412.1 — 624.9 Off-system 41.0 — — 41.0 Miscellaneous 32.7 20.2 0.8 53.7 Total Customer Revenues $ 3,032.0 $ 1,440.4 $ 0.8 $ 4,473.2 Other Revenues 96.1 95.5 16.9 208.5 Total Operating Revenues $ 3,128.1 $ 1,535.9 $ 17.7 $ 4,681.7 (1) Customer revenue amounts exclude intersegment revenues. See Note 21, "Business Segment Information," for discussion of intersegment revenues. (2) Other revenues related to the Transition Services Agreement entered into in connection with the sale of the Massachusetts Business. Other Revenues. As permitted by accounting principles generally accepted in the United States, regulated utilities have the ability to earn certain types of revenue that are outside the scope of ASC 606. These revenues primarily represent revenue earned under alternative revenue programs. Alternative revenue programs represent regulator-approved mechanisms that allow for the adjustment of billings and revenue for certain approved programs. We maintain a variety of these programs, including demand side management initiatives that recover costs associated with the implementation of energy efficiency programs, as well as normalization programs that adjust revenues for the effects of weather or other external factors. Additionally, we maintain certain programs with future test periods that operate similarly to FERC formula rate programs and allow for recovery of costs incurred to replace aging infrastructure. When the criteria to recognize alternative revenue have been met, we establish a regulatory asset and present revenue from alternative revenue programs on the Statements of Consolidated Income (Loss) as “Other revenues”. When amounts previously recognized under alternative revenue accounting guidance are billed, we reduce the regulatory asset and record a customer account receivable. Customer Accounts Receivable. Accounts receivable on our Consolidated Balance Sheets includes both billed and unbilled amounts, as well as certain amounts that are not related to customer revenues. Unbilled amounts of accounts receivable relate to a portion of a customer’s consumption of gas or electricity from the date of the last cycle billing through the last day of the month (balance sheet date). Factors taken into consideration when estimating unbilled revenue include historical usage, customer rates and weather. A significant portion of our operations are subject to seasonal fluctuations in sales. During the heating season, primarily from November through March, revenues and receivables from gas sales are more significant than in other months. The opening and closing balances of customer receivables for the year ended December 31, 2022, are presented in the table below. We had no significant contract assets or liabilities during the period. Additionally, we have not incurred any significant costs to obtain or fulfill contracts. (in millions) Customer Accounts Receivable, Billed (less reserve) Customer Accounts Receivable, Unbilled (less reserve) Balance as of December 31, 2021 $ 459.6 $ 337.0 Balance as of December 31, 2022 560.5 453.0 Utility revenues are billed to customers monthly on a cycle basis. We expect that substantially all customer accounts receivable will be collected following customer billing, as this revenue consists primarily of periodic, tariff-based billings for service and usage. We maintain common utility credit risk mitigation practices, including requiring deposits and actively pursuing collection of past due amounts. Our regulated operations also utilize certain regulatory mechanisms that facilitate recovery of bad debt costs within tariff-based rates, which provides further evidence of collectibility. It is probable that substantially all of the consideration to which we are entitled from customers will be collected upon satisfaction of performance obligations. Allowance for Credit Losses. To evaluate for expected credit losses, customer account receivables are pooled based on similar risk characteristics, such as customer type, geography, payment terms, and related macro-economic risks. Expected credit losses are established using a model that considers historical collections experience, current information, and reasonable and supportable forecasts. Internal and external inputs are used in our credit model including, but not limited to, energy consumption trends, revenue projections, actual charge-offs data, recoveries data, shut-offs, customer delinquencies, final bill data, and inflation. We continuously evaluate available information relevant to assessing collectability of current and future receivables. We evaluate creditworthiness of specific customers periodically or following changes in facts and circumstances. When we become aware of a specific commercial or industrial customer's inability to pay, an allowance for expected credit losses is recorded for the relevant amount. We also monitor other circumstances that could affect our overall expected credit losses; including, but not limited to, creditworthiness of overall population in service territories, adverse conditions impacting an industry sector, and current economic conditions. At each reporting period, we record expected credit losses to an allowance for credit losses account. When deemed to be uncollectible, customer accounts are written-off. A rollforward of our allowance for credit losses as of December 31, 2022 and December 31, 2021, are presented in the tables below: (in millions) Gas Distribution Operations Electric Operations Corporate and Other Total Balance as of January 1, 2022 $ 18.9 $ 3.8 $ 0.8 $ 23.5 Current period provisions 29.1 6.9 — 36.0 Write-offs charged against allowance (52.1) (5.3) — (57.4) Recoveries of amounts previously written off 21.3 0.5 — 21.8 Balance as of December 31, 2022 $ 17.2 $ 5.9 $ 0.8 $ 23.9 (in millions) Gas Distribution Operations Electric Operations Corporate and Other Total Balance as of January 1, 2021 $ 41.8 $ 9.7 $ 0.8 $ 52.3 Current period provisions 5.8 1.4 — 7.2 Write-offs charged against allowance (46.7) (7.7) — (54.4) Recoveries of amounts previously written off 18.0 0.4 — 18.4 Balance as of December 31, 2021 $ 18.9 $ 3.8 $ 0.8 $ 23.5 In connection with the COVID-19 pandemic, certain state regulatory commissions instituted regulatory moratoriums that impacted our ability to pursue our standard credit risk mitigation practices. Following the issuance of these moratoriums, certain of our regulated operations have been authorized to recognize a regulatory asset for bad debt costs above levels currently recovered in rates. At the balance sheet date, in addition to our evaluation of the allowance for credit losses discussed above, we considered benefits available under governmental COVID-19 relief programs, the impact of unemployment benefits initiatives, and flexible payment plans being offered to customers affected by or experiencing hardship as a result of the pandemic, which could help to mitigate the potential for increasing customer account delinquencies. We also considered the on-time bill payment promotion and robust customer marketing strategy for energy assistance programs that we have implemented. Based upon this evaluation, we have concluded that the allowance for credit losses as of December 31, 2022 adequately reflected the collection risk and net realizable value of our receivables. See Note 9, "Regulatory Matters," for additional information on regulatory moratoriums and regulatory assets.

Variable Interest Entities

Variable Interest Entities	12 Months Ended
	Dec. 31, 2022
Variable Interest Entities [Abstract]
Variable Interest Entities	A VIE is an entity in which the controlling interest is determined through means other than a majority voting interest. Refer to Note 1, "Nature of Operations and Summary of Significant Accounting Policies - S. VIEs and Allocation of Earnings," for information on our accounting policy for the VIEs. NIPSCO owns and operates two wind facilities, Rosewater and Indiana Crossroads Wind, which have 102 MW and 302 MW of nameplate capacity, respectively. NIPSCO also owns one solar facility, which is expected to go into service in 2023, Indiana Crossroads Solar, which has 200 MW of nameplate capacity. We control decisions that are significant to these entities' ongoing operations and economic results. Therefore, we have concluded that we are the primary beneficiary and have consolidated all three entities. Members of the respective JVs are NIPSCO (who is the managing member) and tax equity partners. Earnings, tax attributes and cash flows are allocated to both NIPSCO and the tax equity partner in varying percentages by category and over the life of the partnership. NIPSCO and each tax equity partner contributed cash, and NIPSCO also assumed an obligation to the developers of the wind facilities representing the remaining economic interest. The developers of the wind facilities are not a partner in the JV for federal income tax purposes and do not receive any share of earnings, tax attributes, or cash flows of each JV. Once the tax equity partner has earned their negotiated rate of return and we have reached the agreed upon contractual date, NIPSCO has the option to purchase at fair market value from the tax equity partner the remaining interest in the respective JV. NIPSCO has an obligation to purchase, through a PPA at established market rates, 100% of the electricity generated by the JVs. The following table displays the total contributions paid and obligations incurred in the periods presented: (in millions) December 31, 2022 December 31, 2021 December 31, 2020 NIPSCO Cash Contributions $ 151.8 $ 2.8 $ 0.7 Tax Equity Partner Cash Contributions 21.2 245.1 86.1 NIPSCO's Obligation to Developer (1) — 277.5 69.7 Total Contributions $ 173.0 $ 525.4 $ 156.5 (1) Outstanding amounts in "Obligations to renewable generation asset developer" in the Consolidated Balance Sheets. We did not provide any financial or other support during the year that was not previously contractually required, nor do we expect to provide such support in the future. Our Consolidated Balance Sheets included the following assets and liabilities associated with VIEs. (in millions) December 31, December 31, Net Property, Plant and Equipment $ 978.5 $ 695.9 Current assets 25.7 14.3 Total assets (1) 1,004.2 710.2 Current liabilities 128.2 10.0 Asset retirement obligations 30.6 20.5 Total liabilities $ 158.8 $ 30.5 (1) The assets of each VIE represent assets of a consolidated VIE that can be used only to settle obligations of the respective consolidated VIE. The creditors of the liabilities of the VIEss do not have recourse to the general credit of the primary beneficiary.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2022
Earnings Per Share [Abstract]
Earnings Per Share	The calculations of basic and diluted EPS are based on the weighted average number of shares of common stock and potential common stock outstanding during the period. For the purposes of determining diluted EPS, the shares underlying the purchase contracts included within the Equity Units were included in the calculation of potential common stock outstanding for the years ended December 31, 2022 and 2021 using the if-converted method under US GAAP. This method assumes conversion at the beginning of the reporting period, or at time of issuance, if later. For the purchase contracts, the number of shares of our common stock that would be issuable at the end of each reporting period will be reflected in the denominator of our diluted EPS calculation. If the stock price falls below the initial reference price of $24.51, subject to anti-dilution adjustments, the number of shares of our common stock used in calculating diluted EPS will be the maximum number of shares per the contract as described in Note 13, "Equity." Conversely, if the stock price is above the initial reference price of $24.51, subject to anti-dilution adjustments, a variable number of shares of our common stock will be used in calculating diluted EPS. A numerator adjustment was reflected in the calculation of diluted EPS for interest expense incurred in 2022 and 2021, net of tax, related to the purchase contracts. We adopted ASU 2020-06 on January 1, 2022, which resulted in additional dilution from our Equity Units by requiring us to assume share settlement of the remaining purchase contract payment balance based on the average share price during the period. The shares underlying the Series C Mandatory Convertible Preferred Stock included within the Equity Units are contingently convertible as the conversion is contingent on a successful remarketing as described in Note 13, "Equity." Contingently convertible shares where conversion is not tied to a market price trigger are excluded from the calculation of diluted EPS until such time as the contingency has been resolved under the if-converted method. As of December 31, 2022 and 2021, the contingency was not resolved and thus no shares were reflected in the denominator in the calculation of diluted EPS for the years ended December 31, 2022 and 2021. Diluted EPS also includes the incremental effects of the various long-term incentive compensation plans and the open ATM forward agreements during the period under the treasury stock method when the impact would be dilutive. Refer to Note 13, "Equity," for more information on our ATM forward agreements. For the year ended December 31, 2020, we had a net loss on the Statements of Consolidated Income (Loss) during the period, and any potentially dilutive shares would have had an anti-dilutive impact on EPS. The following table presents the calculation of our basic and diluted EPS: Year Ended December 31, (in millions, except per share amounts) 2022 2021 2020 Numerator: Net Income (Loss) Available to Common Shareholders - Basic $ 749.0 $ 529.8 $ (72.7) Dilutive effect of Equity Units 2.0 1.6 — Net Income (Loss) Available to Common Shareholders - Diluted $ 751.0 $ 531.4 $ (72.7) Denominator: Average common shares outstanding - Basic 407.1 393.6 384.3 Dilutive potential common shares: Equity Units purchase contracts 30.2 22.0 — Equity Units purchase contract payment balance 3.2 — — Shares contingently issuable under employee stock plans 0.9 0.8 — Shares restricted under employee stock plans 0.5 0.3 — ATM Forward agreements 0.8 0.6 — Average Common Shares - Diluted 442.7 417.3 384.3 Earnings per common share: Basic $ 1.84 $ 1.35 $ (0.19) Diluted $ 1.70 $ 1.27 $ (0.19)

Property, Plant And Equipment

Property, Plant And Equipment	12 Months Ended
	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Property, Plant And Equipment	Our property, plant and equipment on the Consolidated Balance Sheets are classified as follows: At December 31, (in millions) 2022 2021 Property, Plant and Equipment Gas Distribution Utility (1) $ 16,576.4 $ 15,240.6 Electric Utility (1) 7,162.4 6,754.9 Corporate 271.7 217.8 Construction Work in Process 1,398.2 808.0 Renewable Generation Assets (2) 702.2 702.4 Non-Utility and Other 1,440.4 1,447.6 Total Property, Plant and Equipment $ 27,551.3 $ 25,171.3 Accumulated Depreciation and Amortization Gas Distribution Utility (1) $ (3,678.1) $ (3,490.2) Electric Utility (1) (2,557.4) (2,433.1) Corporate (160.0) (132.2) Renewable Generation Assets (2) (29.7) (6.5) Non-Utility and Other (1,283.5) (1,227.5) Total Accumulated Depreciation and Amortization $ (7,708.7) $ (7,289.5) Net Property, Plant and Equipment $ 19,842.6 $ 17,881.8 (1) NIPSCO’s common utility plant and associated accumulated depreciation and amortization are allocated between Gas Distribution Utility and Electric Utility Property, Plant and Equipment. (2) Our renewable generation assets are part of our electric segment and represent Non-Utility Property, owned and operated by JVs between NIPSCO and unrelated tax equity partners, and depreciated straight-line over 30 years. Refer to Note 4, "Variable Interest Entities," for additional information. On October 1, 2021, NIPSCO retired R.M. Schahfer Generating Station Units 14 and 15. The net book value of the retired units was reclassified from "Net Property, Plant and Equipment," to current and long-term ''Regulatory Assets.'' The estimated net book value of R.M. Schahfer Generating Station's coal Units 14 and 15 and other associated plant retired was approximately $600.0 million. See Note 9, "Regulatory Matters," for additional details regarding the recovery of the regulatory assets associated with retired generating stations. The weighted average depreciation provisions for utility plant, as a percentage of the original cost, for the periods ended December 31, 2022, 2021 and 2020 were as follows: 2022 2021 2020 Electric Operations 3.1 % 3.4 % 3.4 % Gas Distribution Operations 2.3 % 2.2 % 2.3 % We recognized depreciation expense of $685.0 million, $672.1 million and $655.6 million for the years ended 2022, 2021 and 2020, respectively. The 2022 and 2021 depreciation expense amounts include an $11.0 million and $5.3 million increase related to the regulatory deferral of income (loss) associated with our JVs, which is not included in current rates. See Note 9, "Regulatory Matters," for additional details. Amortization of on-premise Software Costs. We amortized $53.1 million, $49.4 million and $56.7 million in 2022, 2021 and 2020, respectively, related to software recorded as intangible assets. Our unamortized software balance was $190.1 million and $181.8 million at December 31, 2022 and 2021, respectively.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill And Other Intangible Assets	Substantially all of our goodwill relates to the excess of cost over the fair value of the net assets acquired in the Columbia acquisition on November 1, 2000. Our goodwill balance was $1,485.9 million as of December 31, 2022 and 2021. All our goodwill has been allocated to our Gas Distribution Operations segment.For our annual goodwill impairment analysis performed as of May 1, 2022, we completed a qualitative "step 0" assessment and determined that it was more likely than not that the estimated fair value of the reporting unit substantially exceeded the related carrying value of our reporting unit. For this test, we assessed various assumptions, events and circumstances that would have affected the estimated fair value of the reporting units as compared to the baseline "step 1" fair value measurement performed May 1, 2020.

Asset Retirement Obligations

Asset Retirement Obligations	12 Months Ended
	Dec. 31, 2022
Asset Retirement Obligation [Abstract]
Asset Retirement Obligations	We have recognized asset retirement obligations associated with various legal obligations including costs to remove and dispose of certain construction materials located within many of our facilities (including our JV facilities), certain costs to retire pipeline, removal costs for certain underground storage tanks, removal of certain pipelines known to contain PCB contamination, closure costs for certain sites including ash ponds, solid waste management units and a landfill, as well as some other nominal asset retirement obligations. We also have an obligation associated with the decommissioning of our two hydro facilities located in Indiana. These hydro facilities have an indeterminate life, and as such, no asset retirement obligation has been recorded. Changes in our liability for asset retirement obligations for the years 2022 and 2021 are presented in the table below: (in millions) 2022 2021 Beginning Balance $ 512.4 $ 495.6 Accretion recorded as a regulatory asset/liability 17.1 16.0 Additions 9.5 23.2 Settlements (22.3) (11.2) Change in estimated cash flows (3.2) (11.2) Ending Balance $ 513.5 $ 512.4 Certain non-legal costs of removal that have been, and continue to be, included in depreciation rates and collected in the customer rates of the rate-regulated subsidiaries are classified as "Regulatory liabilities" on the Consolidated Balance Sheets.

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2022
Regulatory Assets and Liabilities Disclosure [Abstract]
Regulatory Matters	Regulatory Assets and Liabilities We follow the accounting and reporting requirements of ASC Topic 980, which provides that regulated entities account for and report assets and liabilities consistent with the economic effect of regulatory rate-making procedures when the rates established are designed to recover the costs of providing the regulated service and it is probable that such rates will be charged and collected from customers. Certain expenses and credits subject to utility regulation or rate determination normally reflected in income or expense are deferred on the balance sheet and are recognized in the income statement as the related amounts are included in customer rates and recovered from or refunded to customers. We assess the probability of collection for all of our regulatory assets each period. Regulatory assets were comprised of the following items: At December 31, (in millions) 2022 2021 Regulatory Assets Unrecognized pension and other postretirement benefit costs (see Note 12) $ 607.5 $ 512.1 Deferred pension and other postretirement benefit costs (see Note 12) 72.2 74.8 Environmental costs (see Note 19-E.) 41.4 45.8 Regulatory effects of accounting for income taxes (see Note 1-N. and Note 11) 158.0 194.8 Under-recovered gas and fuel costs (see Note 1-J.) 85.5 73.6 Depreciation 191.3 177.5 Post-in-service carrying charges 251.5 237.9 Safety activity costs 200.7 171.9 DSM programs 37.5 39.2 Retired coal generating stations 744.0 803.9 Losses on commodity price risk programs (See Note 10) 10.0 9.6 Deferred property taxes 68.5 65.1 Renewable energy investments (See Note 1-S. and Note 4) 37.7 18.5 Other 75.0 67.5 Total Regulatory Assets $ 2,580.8 $ 2,492.2 Less: Current Portion 233.2 206.2 Total Noncurrent Regulatory Assets $ 2,347.6 $ 2,286.0 Regulatory liabilities were comprised of the following items: At December 31, (in millions) 2022 2021 Regulatory Liabilities Over-recovered gas and fuel costs (see Note 1-J.) $ 20.6 $ 5.4 Cost of removal (see Note 8) 675.9 749.5 Regulatory effects of accounting for income taxes (see Note 1-N. and Note 11) 996.3 1,040.8 Deferred pension and other postretirement benefit costs (see Note 12) 66.8 75.9 Gains on commodity price risk programs (See Note 10) 90.0 34.2 Customer Assistance Programs 32.9 13.2 Rate Refunds 51.4 8.2 Other 78.7 52.8 Total Regulatory Liabilities $ 2,012.6 $ 1,980.0 Less: Current Portion 236.8 137.4 Total Noncurrent Regulatory Liabilities $ 1,775.8 $ 1,842.6 Regulatory assets, including under-recovered gas and fuel costs and depreciation, of approximately $1,324.7 million and $1,207.0 million as of December 31, 2022 and 2021, respectively, are not earning a return on investment. These costs are recovered over a remaining life, the longest of which is 50 years. Assets: Unrecognized pension and other postretirement benefit costs. Represents the deferred other comprehensive income or loss of the actuarial gains or losses and the prior service costs or credits that arise during the period but that are not immediately recognized as components of net periodic benefit costs by certain subsidiaries that will ultimately be recovered through base rates. Deferred pension and other postretirement benefit costs. Primarily relates to the difference between defined benefit plan expense recorded by certain subsidiaries due to regulatory orders and the corresponding expense that would otherwise be recorded in accordance with GAAP. The majority of these amounts are driven by Columbia of Ohio. On January 26, 2023, the PUCO approved the joint stipulation in Columbia of Ohio's rate case. In the stipulation, Columbia agreed to forego the continuation of its pension and OPEB deferral prospectively as of March 31, 2021. Amounts deferred as of March 31, 2021 will be included in base rates. Environmental costs. Includes certain recoverable costs related to gas plant sites, disposal sites or other sites onto which material may have migrated, the recovery of which is to be addressed in future base rates, billing riders or tracking mechanisms of certain of our subsidiaries. Regulatory effects of accounting for income taxes. Represents the deferral and under collection of deferred taxes in the rate making process. Under-recovered gas and fuel costs. Represents the difference between the costs of gas and fuel and the recovery of such costs in revenue and is used to adjust future billings for such deferrals on a basis consistent with applicable state-approved tariff provisions. Recovery of these costs is achieved through tracking mechanisms. Depreciation. Represents differences between depreciation expense incurred on a GAAP basis and that prescribed through regulatory order. The majority of this balance is driven by Columbia of Ohio's IRP and CEP deferrals, however, starting in March 2023, the majority of these costs will be in base rates. Post-in-service carrying charges. Represents deferred debt-based carrying charges incurred on certain assets placed into service but not yet included in customer rates. The majority of this balance is driven by Columbia of Ohio's IRP and CEP deferrals, however, starting in March 2023, the majority of these costs will be in base rates. Safety activity costs. Represents the difference between costs incurred by certain of our subsidiaries in eligible safety programs in compliance with PHMSA regulations in excess of those being recovered in rates. The majority of this balance is driven by Columbia of Ohio, which will begin recovery in March 2023 through base rates. DSM programs. Represents costs associated with Gas Distribution Operations and Electric Operations segments' energy efficiency and conservation programs. Costs are recovered through tracking mechanisms. Retired coal generating stations. Represents the net book value of Units 7 and 8 of Bailly Generating Station that was retired during 2018 and the net book value of Units 14 and 15 of R.M. Schahfer Generating Station retired in 2021. These amounts are currently being amortized at a rate consistent with their inclusion in customer rates. The December 2019 NIPSCO electric rate case order allows for the recovery of, and on, the net book value of the stations by the end of 2032 and implements a revenue credit for the retired units. The credit is based on the difference between the net book value of Units 14 and 15 upon retirement and the last base rate case proceeding. The credit will be reset when new base rates are determined. See Note 6, "Property, Plant and Equipment," for further details. Losses on commodity price risk programs . Represents the unrealized losses related to certain of our subsidiary's commodity price risk programs. These programs help to protect against the volatility of commodity prices and these amounts are collected from customers through their inclusion in customer rates. Deferred property taxes . Represents the deferral and under collection of property taxes in the rate making process for Columbia of Ohio and is driven by the IRP and CEP deferrals, however, starting in March 2023, the majority of these costs will be in base rates. Renewable energy investments. Represents the regulatory deferral of certain amounts representing the timing difference between the profit earned from the JVs and the amount included in regulated rates to recover our approved investments in consolidated JVs. These amounts will be collected through base rates over the life of the renewable generating assets to which they relate. Refer to Note 1, "Nature of Operations and Summary of Significant Accounting Policies - S. VIEs and Allocation of Earnings," for additional information. Renewable energy formation and developer costs are also included in this regulatory asset. Liabilities: Over-recovered gas and fuel costs. Represents the difference between the cost of gas and fuel and the recovery of such costs in revenues and is the basis to adjust future billings for such refunds on a basis consistent with applicable state-approved tariff provisions. Refunding of these revenues is achieved through tracking mechanisms. Cost of removal. Represents anticipated costs of removal for utility assets that have been collected through depreciation rates for future costs to be incurred. Regulatory effects of accounting for income taxes. Represents amounts owed to customers for deferred taxes collected at a higher rate than the current statutory rates and liabilities associated with accelerated tax deductions owed to customers. Balance includes excess deferred taxes recorded upon implementation of the TCJA in December 2017, net of amounts amortized through 2022. Deferred pension and other postretirement benefit costs. Primarily represents cash contributions in excess of postretirement benefit expense that is deferred by certain subsidiaries. Gains on commodity price risk programs . Represents the unrealized gains related to certain of our subsidiary's commodity price risk programs. These programs help to protect against the volatility of commodity prices, and these amounts are passed back to customers through their inclusion in customer rates. Customer Assistance Programs . Represents the difference between the eligible customer assistance program costs and collections, which will be refunded to customers. Rate Refunds . Represents supplier refunds received by the company that are owed to customers and will be remitted. NIPSCO change in accounting estimate As part of the NIPSCO Gas Settlement and Stipulation Agreement filed on March 2, 2022, NIPSCO Gas agreed to change the depreciation methodology for its calculation of depreciation rates, which reduces depreciation expense and subsequent revenues and cash flows. An order was received on July 27, 2022 approving the rate case and rates were effective as of September 1, 2022. NIPSCO has proposed a similar change in depreciation methodology in its pending electric base rate case. Columbia of Ohio regulatory filing update On Wednesday, April 6, 2022, the PUCO Staff issued its Staff Report in Columbia of Ohio's base rate case, filed on June 21, 2021, which was filed in conjunction with applications for an alternative rate plan, approval of certain deferral authority, and updates to certain riders. Columbia of Ohio's application requested a net rate increase approximating a 21.3% or $221.4 million increase in revenue per year. On October 31, 2022, Columbia of Ohio filed a joint stipulation and recommendation with certain parties to settle the base rate case. The joint stipulation and recommendation includes a rate increase of 7.97%, or $68.2 million and includes adjustments to plant assets, pension expenses, environmental remediation costs and other operations and maintenance expenses. The joint stipulation and recommendation also proposes to extend both of Columbia of Ohio's capital investment riders, the IRP and CEP, for capital invested through the 2026 calendar year. Columbia of Ohio recorded the material effects of the joint stipulation in the fourth quarter. On January 26, 2023, the PUCO approved the joint stipulation and recommendation. Regulatory deferral related to renewable energy investments The offset to the regulatory liability or asset associated with our renewable investments included in regulated rates is recorded in "Depreciation expense" on the Statements of Consolidated Comprehensive Income (Loss). Refer to Note 4, "Variable Interest Entities," and Note 6, "Property, Plant and Equipment," for additional information. FAC Adjustment As ordered by the IURC on June 15, 2022, NIPSCO is required to refund to customers $8.0 million of over-collected fuel costs. The remaining refund is recorded as a regulatory liability on the Consolidated Balance Sheets and is expected to be refunded in 2023. COVID-19 Regulatory Filings In response to COVID-19, we received approvals or directives from the regulatory commissions in the states in which we operate. The ongoing impacts of these approvals or directives are described in the table below: Jurisdiction Regulatory Asset balance as of December 31, 2022 (in millions) Regulatory Asset balance as of December 31, 2021 (in millions) Deferred COVID-19 Costs Columbia of Ohio $ — $ 2.1 Incremental operation and maintenance expenses NIPSCO $ 2.1 $ 2.2 Incremental bad debt expense and the costs to implement the requirements of the COVID-19 related order Columbia of Pennsylvania $ 2.8 $ 5.2 Incremental bad debt expense incurred from March 13, 2020 through December 29, 2021, above levels currently in rates Columbia of Virginia $ 1.9 $ 1.5 Incremental incurred costs, including incremental bad debt expense Columbia of Maryland $ 1.3 $ 0.9 Incremental costs (including incremental bad debt expense) incurred to ensure that customers have essential utility service during the state of emergency in Maryland. Such incremental costs must be offset by any benefit received in connection with the pandemic On January 26, 2023, the PUCO approved the joint stipulation in Columbia of Ohio's rate case. As part of this stipulation, Columbia agreed to forego recovery of its deferred COVID-19 costs. The Pennsylvania PUC lifted its prior pandemic-related moratorium on service terminations for non-payments of utility bills beginning April 1, 2021. In CPA's recent rate case order, total COVID-19 deferrals were updated with the remaining balance being amortized over a four-year period. For Columbia of Virginia, the moratorium on non-residential disconnections ended on October 6, 2020, and the moratorium on residential disconnections and late payment fees ended on August 30, 2021. In connection with the Maryland Relief Act and the order issued by the PSC of Maryland on June 15, 2021, Columbia of Maryland received approximately $0.8 million of assistance that was applied to customer accounts in August 2021. Columbia of Maryland's recent rate case order includes continued amortization of operation and maintenance expenses. All termination moratoriums will be lifted after April 1, 2023 and normal collections procedures will be resumed. Unless otherwise noted above, all other pandemic-related regulatory actions have expired or been lifted.

Risk Management Activities

Risk Management Activities	12 Months Ended
	Dec. 31, 2022
Risk Management Activities [Abstract]
Risk Management Activities	We are exposed to certain risks related to our ongoing business operations; namely commodity price risk and interest rate risk. We recognize that the prudent and selective use of derivatives may help to lower our cost of debt capital, manage interest rate exposure and limit volatility in the price of natural gas. Risk management assets and liabilities on our derivatives are presented on the Consolidated Balance Sheets as shown below: December 31, 2022 December 31, 2021 (in millions) Assets Liabilities Assets Liabilities Current (1) Derivatives designated as hedging instruments $ — $ — $ — $ 136.4 Derivatives not designated as hedging instruments 18.8 1.1 10.6 0.4 Total $ 18.8 $ 1.1 $ 10.6 $ 136.8 Noncurrent (2) Derivatives designated as hedging instruments $ — $ — $ — $ — Derivatives not designated as hedging instruments 66.0 1.9 13.8 7.4 Total $ 66.0 $ 1.9 $ 13.8 $ 7.4 (1) Presented in "Prepayments and other" and "Other accruals", respectively, on the Consolidated Balance Sheets. (2) Presented in "Deferred charges and other" and "Other noncurrent liabilities", respectively, on the Consolidated Balance Sheets. Our derivative instruments are subject to enforceable master netting arrangements or similar agreements. No collateral was either received or posted related to our outstanding derivative positions at December 31, 2022. If the above gross asset and liability positions were presented net of amounts owed or receivable from counterparties, we would report a net asset position of $81.8 million and $16.6 million at December 31, 2022 and 2021, respectively. Derivatives Not Designated as Hedging Instruments C ommodity price risk management. We, along with our utility customers, are exposed to variability in cash flows associated with natural gas purchases and volatility in natural gas prices. We purchase natural gas for sale and delivery to our retail, commercial and industrial customers, and for most customers the variability in the market price of gas is passed through in their rates. Some of our utility subsidiaries offer programs whereby variability in the market price of gas is assumed by the respective utility. The objective of our commodity price risk programs is to mitigate the gas cost variability, for us or on behalf of our customers, associated with natural gas purchases or sales by economically hedging the various gas cost components using a combination of futures, options, forwards or other derivative contracts. As of December 31, 2022 and 2021, we had 99.0 MMDth and 124.5 MMDth, respectively, of net energy derivative volumes outstanding related to our natural gas hedges. NIPSCO has received IURC approval to lock in a fixed price for its natural gas customers using long-term forward purchase instruments and is limited to 20% of NIPSCO’s average annual GCA purchase volume. As of December 31, 2022, the remaining terms of these instruments range from one All gains and losses on these derivative contracts are deferred as regulatory liabilities or assets and are remitted to or collected from customers through NIPSCO’s quarterly GCA mechanism. These instruments are not designated as hedging instruments. Refer to Note 9, "Regulatory Matters," for additional information. Derivatives Designated as Hedging Instruments Interest rate risk management. As of December 31, 2022, we have no forward-starting interest rate swaps outstanding. On June 7, 2022, we settled a $250.0 million forward-starting interest rate swap agreement contemporaneously with the issuance of $350.0 million of 5.00% senior unsecured notes maturing in 2052. The derivative contract was accounted for as a cash flow hedge. As part of the transaction, the associated net unrealized gain position of $10.2 million is being amortized from AOCI into interest expense over the life of the associated debt. Refer to Note 15, "Long-Term Debt," for additional information. On December 21, 2022, we settled a $250.0 million forward-starting interest rate swap agreement that was designated as a cash flow hedge. As part of the transaction, the associated net unrealized gain position of $10.0 million was recognized immediately in "Other, net" on the Statements of Consolidated Income (Loss) due to the probability that the forecasted borrowing transaction would no longer occur. Cash flow hedges included in "Accumulated other comprehensive loss" on the Consolidated Balance Sheets were: (in millions) AOCI (1) Gain Expected to be Reclassified to Earnings During the Next 12 Months (1) Maximum Term Interest Rate $ (12.6) (0.3) 353 months (1) All amounts are net of tax. The net gain related to these swaps are recorded to AOCI. We amortize the net gain over the life of the debt associated with these swaps as we recognize interest expense. These amounts are immaterial in 2022, 2021 and 2020 and are recorded in "Interest expense, net" on the Statements of Consolidated Income (Loss). There were no amounts excluded from effectiveness testing for derivatives in cash flow hedging relationships at December 31, 2021 and 2020. Our derivative instruments measured at fair value as of December 31, 2022 and 2021 did not contain any credit-risk-related contingent features. Cash flows for derivative financial instruments are generally classified as operating activities.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income Taxes	Income Tax Expense. The components of income tax expense (benefit) were as follows: Year Ended December 31, (in millions) 2022 2021 2020 Income Taxes Current Federal $ 0.4 $ (0.1) $ 0.2 State 7.3 6.0 11.7 Total Current 7.7 5.9 11.9 Deferred Federal 181.0 99.2 (0.4) State (23.0) 13.8 (27.4) Total Deferred 158.0 113.0 (27.8) Deferred Investment Credits (1.1) (1.1) (1.2) Income Taxes $ 164.6 $ 117.8 $ (17.1) Statutory Rate Reconciliation. The following table represents a reconciliation of income tax expense at the statutory federal income tax rate to the actual income tax expense from continuing operations: Year Ended December 31, (in millions) 2022 2021 2020 Book income (loss) before income taxes $ 956.4 $ 706.6 $ (31.3) Tax expense (benefit) at statutory federal income tax rate 200.8 21.0 % 148.3 21.0 % (6.6) 21.0 % Increases (reductions) in taxes resulting from: State income taxes, net of federal income tax benefit 4.5 0.5 14.1 2.0 (11.7) 37.4 Amortization of regulatory liabilities (38.5) (4.0) (39.1) (5.5) (38.4) 122.7 Fines and penalties 0.3 — — — 11.8 (37.7) Employee stock ownership plan dividends and other compensation (1.2) (0.1) (1.2) (0.2) (1.3) 4.2 Deferred taxes on TCJA regulatory liability divested — — — — 23.3 (74.5) Tax accrual adjustments 0.2 — (0.1) — 8.9 (28.4) Federal tax credits (2.3) (0.2) (2.1) (0.3) (2.5) 8.0 Other adjustments 0.8 — (2.1) (0.3) (0.6) 1.9 Income Taxes $ 164.6 17.2 % $ 117.8 16.7 % $ (17.1) 54.6 % The difference in tax expense year-over-year has a relative impact on the effective tax rate proportional to pretax income or loss. The 0.5% increase in effective tax rate in 2022 versus 2021 was primarily due to decreased amortization of excess deferred income taxes, offset by the state jurisdictional mix of pre-tax income in 2022 tax effected at statutory tax rates, and the reduction of the Pennsylvania corporate income tax rate. The 37.9% decrease in effective tax rate in 2021 versus 2020 was primarily the result of higher pre-tax income, state jurisdictional mix of pre-tax income in 2021 tax effected at statutory tax rates and increased amortization of excess deferred federal income taxes in 2021 compared to 2020. These items were offset by decreased deferred tax expense recognized on the sale of Columbia of Massachusetts' regulatory liability in 2020, established due to TCJA in 2017, that would have otherwise been recognized over the amortization period, 2020 non-deductible penalties and valuation allowance related to Columbia of Massachusetts and 2020 one-time tax accrual adjustments. Net Deferred Income Tax Liability Components. Deferred income taxes result from temporary differences between the financial statement carrying amounts and the tax basis of existing assets and liabilities. The principal components of our net deferred tax liability were as follows: At December 31, (in millions) 2022 2021 Deferred tax liabilities Accelerated depreciation and other property differences $ 2,527.9 $ 2,454.4 Other regulatory assets 348.4 308.6 Total Deferred Tax Liabilities 2,876.3 2,763.0 Deferred tax assets Other regulatory liabilities and deferred investment tax credits (including TCJA) 294.3 284.7 Pension and other postretirement/postemployment benefits 124.7 104.8 Net operating loss carryforward and AMT credit carryforward 491.0 545.9 Environmental liabilities 20.7 22.2 Other accrued liabilities 55.9 42.1 Other, net 43.0 111.7 Total Deferred Tax Assets 1,029.6 1,111.4 Valuation Allowance (7.8) (7.8) Net Deferred Tax Assets 1,021.8 1,103.6 Net Deferred Tax Liabilities $ 1,854.5 $ 1,659.4 At December 31, 2022, we have federal net operating loss carryforwards of $410.0 million (tax effected). The federal net operating loss carryforwards are available to offset taxable income and will begin to expire in 2036. We believe it is more likely than not that we will realize the benefit from the federal net operating loss carryforwards. We also have $73.2 million (tax effected, net of federal benefit) of state net operating loss carryforwards. Depending on the jurisdiction in which the state net operating loss was generated, the carryforwards will begin to expire in 2028. We believe it is more likely than not that a portion of the benefit from certain state NOL carryforwards will not be realized. In recognition of this risk, we have provided a valuation allowance of $7.8 million (net) on the deferred tax assets related to sale of Massachusetts Business assets reflected in the state net operating loss carryforward presented above. Unrecognized Tax Benefits. A reconciliation of the beginning and ending amounts of unrecognized tax benefits is as follows: At December 31, 2022, (in millions) 2022 2021 2020 Opening Balance $ 21.7 $ 21.7 $ 23.2 Gross decreases - tax positions in prior period — — (1.5) Gross increases - current period tax positions — — — Ending Balance $ 21.7 $ 21.7 $ 21.7 Offset for net operating loss carryforwards (21.7) (21.7) (21.7) Balance, Less Net Operating Loss Carryforwards $ — $ — $ — We present accrued interest on unrecognized tax benefits, accrued interest on other income tax liabilities and tax penalties in "Income Taxes" on our Statements of Consolidated Income (Loss). Interest expense recorded on unrecognized tax benefits and other income tax liabilities was immaterial for all periods presented. There were no accruals for penalties recorded in the Statements of Consolidated Income (Loss) for the years ended December 31, 2022, 2021 and 2020, and there were no balances for accrued penalties recorded on the Consolidated Balance Sheets as of December 31, 2022 and 2021. We are subject to income taxation in the United States and various state jurisdictions, primarily Indiana, Pennsylvania, Kentucky, Massachusetts, Maryland and Virginia. We participate in the IRS CAP, which provides the opportunity to resolve tax matters with the IRS before filing each year's consolidated federal income tax return. As of December 31, 2022, tax years through 2021 have been audited and are effectively closed to further assessment. The Company has transitioned to the Bridge Phase of the IRS CAP for the year ended December 31, 2022, which will remain open until an audit is completed or the statute of limitation expires. The statute of limitations in each of the state jurisdictions in which we operate remains open between 3-4 years from the date the state income tax returns are filed. As of December 31, 2022, there were no state income tax audits in progress that would have a material impact on the consolidated financial statements.

Pension and Other Postretiremen

Pension and Other Postretirement Benefits	12 Months Ended
	Dec. 31, 2022
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]
Pension and Other Postretirement Benefits	We provide defined contribution plans and noncontributory defined benefit retirement plans that cover certain of our employees. Benefits under the defined benefit retirement plans reflect the employees’ compensation, years of service and age at retirement. Additionally, we provide health care and life insurance benefits for certain retired employees. The majority of employees may become eligible for these benefits if they reach retirement age while working for us. The expected cost of such benefits is accrued during the employees’ years of service. Current rates of rate-regulated companies include postretirement benefit costs, including amortization of the regulatory assets that arose prior to inclusion of these costs in rates. For most plans, cash contributions are remitted to grantor trusts. Our Pension and Other Postretirement Benefit Plans’ Asset Management . The Board has delegated oversight of the pension and other postretirement benefit plans’ assets to the NiSource Benefits Committee (“the Committee”). The Committee has adopted investment policy statements for the pension and other postretirement benefit plans’ assets. For the pension plans, we employ a liability-driven investing strategy. A total return approach is utilized for the other postretirement benefit plans’ assets. A mix of diversified investments are used to maximize the long-term return of plan assets and hedge the liabilities at a prudent level of risk. The investment portfolio includes U.S. and non-U.S. equities, real estate, long-term and intermediate-term fixed income and alternative investments. Risk tolerance is established through careful consideration of plan liabilities, funded status, and asset class volatility. Investment risk is measured and monitored on an ongoing basis through quarterly investment portfolio reviews, annual liability measurements, and periodic asset/liability studies. In determining the expected long-term rate of return on plan assets, historical markets are studied, relationships between equities and fixed income are analyzed and current market factors, such as inflation and interest rates are evaluated with consideration of diversification and rebalancing. Our expected long-term rate of return on assets is based on assumptions regarding target asset allocations and corresponding long-term capital market assumptions for each asset class. The pension plans’ investment policy calls for a gradual reduction in the allocation of return-seeking assets (equities, real estate and private equity) and a corresponding increase in the allocation of liability-hedging assets (fixed income) as the funded status of the plans’ increase. As of December 31, 2022 and December 31, 2021, the acceptable minimum and maximum ranges established by the policy for the pension and other postretirement benefit plans are as follows: December 31, 2022 Defined Benefit Pension Plan Postretirement Benefit Plan Asset Category Minimum Maximum Minimum Maximum Domestic Equities 7% 27% 0% 55% International Equities 3% 13% 0% 25% Fixed Income 69% 81% 20% 100% Real Estate 0% 3% 0% 0% Private Equity 0% 3% 0% 0% Short-Term Investments 0% 10% 0% 10% December 31, 2021 Defined Benefit Pension Plan Postretirement Benefit Plan Asset Category Minimum Maximum Minimum Maximum Domestic Equities 7% 27% 0% 55% International Equities 3% 13% 0% 25% Fixed Income 69% 81% 20% 100% Real Estate 0% 3% 0% 0% Private Equity 0% 3% 0% 0% Short-Term Investments 0% 10% 0% 10% The actual Pension Plan and Postretirement Plan Asset Mix at December 31, 2022 and December 31, 2021 are as follows: Defined Benefit Pension Assets (1) December 31, Postretirement December 31, Asset Class (in millions) Asset Value % of Total Assets Asset Value % of Total Assets Domestic Equities $ 231.1 16.2 % $ 86.9 38.6 % International Equities 119.0 8.4 % 36.6 16.3 % Fixed Income 1,004.3 70.6 % 94.7 42.1 % Real Estate 5.0 0.3 % — — Cash/Other 63.4 4.5 % 6.7 3.0 % Total $ 1,422.8 100.0 % $ 224.9 100.0 % Defined Benefit Pension Assets (1) December 31, Postretirement Benefit Plan Assets December 31, Asset Class (in millions) Asset Value % of Total Assets Asset Value % of Total Assets Domestic Equities $ 324.3 16.4 % $ 118.6 40.4 % International Equities 150.9 7.6 % 50.5 17.2 % Fixed Income 1,382.3 69.7 % 118.8 40.4 % Real Estate 37.2 1.9 % — — Cash/Other 87.0 4.4 % 5.8 2.0 % Total $ 1,981.7 100.0 % $ 293.7 100.0 % (1) Total includes accrued dividends and pending trades with brokers. The categorization of investments into the asset classes in the tables above are based on definitions established by the Committee. Fair Value Measurements. The following table sets forth, by level within the fair value hierarchy, the pension and other postretirement benefits investment assets at fair value as of December 31, 2022 and 2021. Assets are classified in their entirety based on the observability of inputs used in determining the fair value measurement. There were no investment assets in the pension and other postretirement benefits trusts classified within Level 3 for the years ended December 31, 2022 and 2021. We use the following valuation techniques to determine fair value. For the year ended December 31, 2022, there were no significant changes to valuation techniques to determine the fair value of our pension and other postretirement benefits' assets. Level 1 Measurements Most common and preferred stocks are traded in active markets on national and international securities exchanges and are valued at closing prices on the last business day of each period presented. Cash is stated at cost, which approximates fair value, with the exception of cash held in foreign currencies which fluctuates with changes in the exchange rates. Short-term bills and notes are priced based on quoted market values. Level 2 Measurements Most U.S. Government Agency obligations, mortgage/asset-backed securities, and corporate fixed income securities are generally valued by benchmarking model-derived prices to quoted market prices and trade data for identical or comparable securities. To the extent that quoted prices are not available, fair value is determined based on a valuation model that includes inputs such as interest rate yield curves and credit spreads. Securities traded in markets that are not considered active are valued based on quoted market prices, broker or dealer quotations, or alternative pricing sources with reasonable levels of price transparency. Other fixed income includes futures and options which are priced on bid valuation or settlement pricing. Level 3 Measurements Investments with unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets and liabilities are classified as level 3 investments. Not Classified Commingled funds, private equity limited partnerships and real estate partnerships are not classified within the fair value hierarchy. Instead, these assets are measured at estimated fair value using the net asset value per share of the investments. Commingled funds' underlying assets are principally marketable equity and fixed income securities. Units held in commingled funds are valued at the unit value as reported by the investment managers. Private equity funds invest capital in non-public companies and real estate funds invest in commercial and distressed real estate directly or through related debt instruments. The fair value of these investments is determined by reference to the funds’ underlying assets. Fair Value Measurements at December 31, 2022: (in millions) December 31, Quoted Prices in Active Markets for Significant Other Significant Pension plan assets: Cash $ 2.5 $ 2.0 $ 0.5 $ — Equity securities International equities 0.5 0.5 — — Fixed income securities Government 316.3 — 316.3 — Corporate 407.8 — 407.8 — Mortgages/ Asset Backed Securities 2.3 — 2.3 — Other fixed income 1.9 1.9 — — Mutual Funds U.S. multi-strategy 97.4 97.4 — — International equities 29.0 29.0 — — Fixed income 0.2 0.2 — — Private equity limited partnerships (3) U.S. multi-strategy (1) 6.3 — — — International multi-strategy (2) 2.3 — — — Distressed opportunities 0.1 — — — Real estate (3) 5.0 — — — Commingled funds (3) Short-term money markets 46.2 — — — U.S. equities 133.7 — — — International equities 89.6 — — — Fixed income 275.9 — — — Pension plan assets subtotal $ 1,417.0 $ 131.0 $ 726.9 $ — Other postretirement benefit plan assets: Mutual funds U.S. multi-strategy 76.2 76.2 — — International equities 16.3 16.3 — — Fixed income 94.7 94.7 — — Commingled funds (3) Short-term money markets 17.4 — — — U.S. equities 10.7 — — — International equities 20.3 — — — Other postretirement benefit plan assets subtotal $ 235.6 $ 187.2 $ — $ — Due to brokers, net (4) (2.0) — (2.0) — Receivables/payables (10.7) — (10.7) — Accrued income/dividends 7.8 7.8 — — Total pension and other postretirement benefit plan assets $ 1,647.7 $ 326.0 $ 714.2 $ — (1) This class includes limited partnerships/fund of funds that invest in a diverse portfolio of private equity strategies, including buy-outs, growth capital, special situations and secondary markets, primarily inside the United States. (2) This class includes limited partnerships/fund of funds that invest a in diverse portfolio of private equity strategies, including buy-outs, growth capital, special situations and secondary markets, primarily outside the United States. (3) This class of investments is measured at fair value using the net asset value per share and has not been classified in the fair value hierarchy. (4) This class represents pending trades with brokers. The table below sets forth a summary of unfunded commitments, redemption frequency and redemption notice periods for certain investments that are measured at fair value using the net asset value per share for the year ended December 31, 2022: (in millions) Fair Value Unfunded Commitments Redemption Frequency Redemption Notice Period Commingled Funds Short-term money markets $ 63.6 $ — Daily 1 day U.S. equities 144.4 — Daily 1 day - 5 days International equities 109.9 — Monthly 10 days-30 days Fixed income 275.9 — Daily 3 days Private Equity and Real Estate Limited Partnerships (1) 13.7 11.6 N/A N/A Total $ 607.5 $ 11.6 (1) Private equity and real estate limited partnerships typically call capital over a 3-5 year period and pay out distributions as the underlying investments are liquidated. The typical expected life of these limited partnerships is 0-15 years, and these investments typically cannot be redeemed prior to liquidation. Fair Value Measurements at December 31, 2021: (in millions) December 31, Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Significant Pension plan assets: Cash $ 10.3 $ 9.7 $ 0.6 $ — Equity securities International equities 0.5 0.5 — — Fixed income securities Government 387.3 — 387.3 — Corporate 645.9 — 645.9 — Mutual Funds U.S. multi-strategy 128.4 128.4 — — International equities 38.7 38.7 — — Private equity limited partnerships (3) U.S. multi-strategy (1) 10.9 — — — International multi-strategy (2) 4.5 — — — Distressed opportunities 0.1 — — — Real estate (3) 37.2 — — — Commingled funds (3) Short-term money markets 55.0 — — — U.S. equities 195.9 — — — International equities 111.7 — — — Fixed income 349.1 — — — Pension plan assets subtotal $ 1,975.5 $ 177.3 $ 1,033.8 $ — Other postretirement benefit plan assets: Mutual funds U.S. multi-strategy 103.8 103.8 — — International equities 24.4 24.4 — — Fixed income 118.5 118.5 — — Commingled funds (3) Short-term money markets 5.8 — — — U.S. equities 14.8 — — — International equities 26.1 — — — Other postretirement benefit plan assets subtotal $ 293.4 $ 246.7 $ — $ — Due to brokers, net (4) (1.8) — (1.8) — Receivables/payables 0.3 — 0.3 — Accrued income/dividends 8.0 8.0 — — Total pension and other postretirement benefit plan assets $ 2,275.4 $ 432.0 $ 1,032.3 $ — (1) This class includes limited partnerships/fund of funds that invest in a diverse portfolio of private equity strategies, including buy-outs, venture capital, growth capital, special situations and secondary markets, primarily inside the United States. (2) This class includes limited partnerships/fund of funds that invest in diverse portfolio of private equity strategies, including buy-outs, venture capital, growth capital, special situations and secondary markets, primarily outside the United States. (3) This class of investments is measured at fair value using the net asset value per share and has not been classified in the fair value hierarchy. (4) This class represents pending trades with brokers. The table below sets forth a summary of unfunded commitments, redemption frequency and redemption notice periods for certain investments that are measured at fair value using the net asset value per share for the year ended December 31, 2021: (in millions) Fair Value Unfunded Commitments Redemption Frequency Redemption Notice Period Commingled Funds Short-term money markets $ 60.8 $ — Daily 1 day U.S. equities 210.7 — Daily 1 day -5 days International equities 137.8 — Monthly 10 days - 30 days Fixed income 349.1 — Daily 3 days Private Equity and Real Estate Limited Partnerships (1) 20.4 12.1 N/A N/A Total $ 778.8 $ 12.1 (1) Private equity and real estate limited partnerships typically call capital over a 3-5 year period and pay out distributions as the underlying investments are liquidated. The typical expected life of these limited partnerships is 0-15 years, and these investments typically cannot be redeemed prior to liquidation. Our Pension and Other Postretirement Benefit Plans’ Funded Status and Related Disclosure . The following table provides a reconciliation of the plans’ funded status and amounts reflected in our Consolidated Balance Sheets at December 31 based on a December 31 measurement date: Pension Benefits Other Postretirement Benefits (in millions) 2022 2021 2022 2021 Change in projected benefit obligation (1) Benefit obligation at beginning of year $ 1,852.4 $ 2,058.4 $ 556.2 $ 590.8 Service cost 27.8 30.2 6.5 6.2 Interest cost 40.5 31.4 12.0 9.9 Plan participants’ contributions — — 4.1 4.2 Plan amendments 0.2 — 2.1 0.1 Actuarial gain (2) (318.7) (68.7) (89.9) (14.8) Benefits paid (174.8) (198.9) (42.3) (40.6) Estimated benefits paid by incurred subsidy — — 0.3 0.4 Projected benefit obligation at end of year $ 1,427.4 $ 1,852.4 $ 449.0 $ 556.2 Change in plan assets Fair value of plan assets at beginning of year $ 1,981.7 $ 2,117.7 $ 293.7 $ 286.4 Actual return on plan assets (386.8) 58.9 (51.9) 23.9 Employer contributions 2.7 4.0 21.3 19.8 Plan participants’ contributions — — 4.1 4.2 Benefits paid (174.8) (198.9) (42.3) (40.6) Fair value of plan assets at end of year $ 1,422.8 $ 1,981.7 $ 224.9 $ 293.7 Funded Status at end of year $ (4.6) $ 129.3 $ (224.1) $ (262.5) Amounts recognized in the statement of financial position consist of: Noncurrent assets 18.3 159.3 — — Current liabilities (2.6) (2.8) (1.0) (1.0) Noncurrent liabilities (20.3) (27.2) (223.1) (261.5) Net amount recognized at end of year (3) $ (4.6) $ 129.3 $ (224.1) $ (262.5) Amounts recognized in accumulated other comprehensive income or regulatory asset/liability (4) Unrecognized prior service credit $ 0.4 $ 0.3 $ (3.4) $ (7.8) Unrecognized actuarial loss 564.2 438.0 64.0 88.5 Net amount recognized at end of year $ 564.6 $ 438.3 $ 60.6 $ 80.7 (1) The change in benefit obligation for Pension Benefits represents the change in Projected Benefit Obligation while the change in benefit obligation for Other Postretirement Benefits represents the change in accumulated postretirement benefit obligation. (2) The pension actuarial gain was primarily driven by the increase in discount rate. The postretirement benefit gain was also primarily driven by an increase in discount rates. (3) We recognize our Consolidated Balance Sheets underfunded and overfunded status of our various defined benefit postretirement plans, measured as the difference between the fair value of the plan assets and the benefit obligation. (4) We determined that for certain rate-regulated subsidiaries the future recovery of pension and other postretirement benefits costs is probable. These rate-regulated subsidiaries recorded regulatory assets and liabilities of $607.5 million and zero, respectively, as of December 31, 2022, and $512.1 million and zero, respectively, as of December 31, 2021 that would otherwise have been recorded to accumulated other comprehensive loss. Our accumulated benefit obligation for our pension plans was $1,416.8 million and $1,834.4 million as of December 31, 2022 and 2021, respectively. The accumulated benefit obligation at each date is the actuarial present value of benefits attributed by the pension benefit formula to employee service rendered prior to that date and based on current and past compensation levels. The accumulated benefit obligation differs from the projected benefit obligation disclosed in the table above in that it includes no assumptions about future compensation levels. We are required to reflect the funded status of our pension and postretirement benefit plans on the Consolidated Balance Sheet. The funded status of the plans is measured as the difference between the plan assets' fair value and the projected benefit obligation. We present the noncurrent aggregate of all underfunded plans within "Accrued liability for postretirement and postemployment benefits." The portion of the amount by which the actuarial present value of benefits included in the projected benefit obligation exceeds the fair value of plan assets, payable in the next 12 months, is reflected in "Accrued compensation and other benefits." We present the aggregate of all overfunded plans within "Deferred charges and other." Information for pension plans with a projected benefit obligation in excess of plan assets: December 31, 2022 2021 Accumulated Benefit Obligation $ 22.9 $ 30.0 Funded Status Projected Benefit Obligation 22.9 30.0 Funded Status of Underfunded Pension Plans at End of Year (1) $ (22.9) $ (30.0) (1) As of December 31, 2022 and 2021, only our nonqualified plans were underfunded. These plans have no assets as they are not funded until benefits are paid. Information for pension plans with plan assets in excess of the projected benefit obligation: December 31, 2022 2021 Accumulated Benefit Obligation $ 1,393.8 $ 1,804.3 Funded Status Projected Benefit Obligation 1,404.5 1,822.4 Fair Value of Plan Assets 1,422.8 1,981.7 Funded Status of Overfunded Pension Plans at End of Year $ 18.3 $ 159.3 Our pension plans were underfunded, in aggregate, by $4.6 million at December 31, 2022 compared to being overfunded by $129.3 million at December 31, 2021. The decline in the funded status was primarily due to unfavorable asset returns offset by an increase in discount rates. We contributed $2.7 million and $4.0 million to our pension plans in 2022 and 2021, respectively. Our other postretirement benefit plans were underfunded by $224.1 million at December 31, 2022 compared to being underfunded by $262.5 million at December 31, 2021. The improvement in funded status was primarily due to increased discount rates offset by unfavorable asset returns. We contributed $21.3 million and $19.8 million to our other postretirement benefit plans in 2022 and 2021, respectively. In 2022 and 2021, some of our qualified pension plans paid lump sum payouts in excess of the respective plan's service cost plus interest cost, thereby meeting the requirement for settlement accounting. We recorded settlement charges of $12.4 million and $11.4 million in 2022 and 2021, respectively. Net periodic pension benefit cost increased by $5.7 million and $4.0 million in 2022 and 2021, respectively, as the result of the remeasurement. The following table provides the key assumptions that were used to calculate the pension and other postretirement benefits obligations for our various plans as of December 31: Pension Benefits Other Postretirement Benefits 2022 2021 2022 2021 Weighted-average assumptions to Determine Benefit Obligation Discount Rate 5.14 % 2.76 % 5.17 % 2.85 % Rate of Compensation Increases 4.00 % 4.00 % N/A N/A Interest Crediting Rates 4.00 % 4.00 % N/A N/A Health Care Trend Rates Trend for Next Year N/A N/A 6.69 % 6.20 % Ultimate Trend N/A N/A 4.75 % 4.50 % Year Ultimate Trend Reached N/A N/A 2032 2030 We expect to make contributions of approximately $2.6 million to our pension plans and approximately $23.7 million to our postretirement medical and life plans in 2023. The following table provides benefits expected to be paid in each of the next five fiscal years, and in the aggregate for the five fiscal years thereafter. The expected benefits are estimated based on the same assumptions used to measure our benefit obligation at the end of the year and include benefits attributable to the estimated future service of employees: (in millions) Pension Benefits Other Federal Year(s) 2023 $ 150.5 $ 38.9 $ 0.4 2024 145.2 38.5 0.2 2025 141.2 37.8 0.2 2026 133.8 36.9 0.2 2027 128.1 36.4 0.2 2028-2032 563.2 172.0 0.9 The following table provides the components of the plans’ actuarially determined net periodic benefits cost for each of the three years ended December 31, 2022, 2021 and 2020: Pension Benefits Other Postretirement (in millions) 2022 2021 2020 2022 2021 2020 Components of Net Periodic Benefit (Income) Cost (1) Service cost $ 27.8 $ 30.2 $ 32.0 $ 6.5 $ 6.2 $ 6.6 Interest cost 40.5 31.4 51.6 12.0 9.9 15.4 Expected return on assets (90.8) (101.6) (111.6) (16.2) (15.3) (14.4) Amortization of prior service cost (credit) 0.1 0.1 0.7 (2.2) (2.2) (2.1) Recognized actuarial loss 20.3 21.7 33.8 2.6 4.6 4.9 Settlement/curtailment loss 12.4 11.4 10.5 — — 1.5 Total Net Periodic Benefits (Income) Cost $ 10.3 $ (6.8) $ 17.0 $ 2.7 $ 3.2 $ 11.9 (1) Service cost is presented in "Operation and maintenance" on the Statements of Consolidated Income (Loss). Non-service cost components are presented within "Other, net." The following table provides the key assumptions that were used to calculate the net periodic benefits cost for our various plans: Pension Benefits Other Postretirement 2022 2021 2020 2022 2021 2020 Weighted-average Assumptions to Determine Net Periodic Benefit Cost Discount rate - service cost 3.08 % 2.81 % 3.39 % 3.21 % 3.00 % 3.52 % Discount rate - interest cost 2.11 % 1.57 % 2.65 % 2.24 % 1.73 % 2.76 % Expected Long-Term Rate of Return on Plan Assets 4.80 % 5.20 % 5.70 % 5.72 % 5.50 % 5.67 % Rate of Compensation Increases 4.00 % 4.00 % 4.00 % N/A N/A N/A Interest Crediting Rates 4.00 % 4.00 % 4.00 % N/A N/A N/A We assumed a 4.80% and 5.72% rate of return on pension and other postretirement plan assets, respectively, for our calculation of 2022 pension benefits and other postretirement benefits costs. These rates were primarily based on asset mix and historical rates of return and were adjusted in 2022 due to anticipated changes in asset allocation and projected market returns. The following table provides other changes in plan assets and projected benefit obligations recognized in other comprehensive income or regulatory asset or liability: Pension Benefits Other Postretirement (in millions) 2022 2021 2022 2021 Other Changes in Plan Assets and Projected Benefit Obligations Net prior service cost $ 0.2 $ — $ 2.1 $ 0.1 Net actuarial loss (gain) 158.9 (26.0) (21.8) (23.3) Settlements/curtailments (12.4) (11.4) — — Less: amortization of prior service cost (0.1) (0.1) 2.2 2.2 Less: amortization of net actuarial loss (20.3) (21.7) (2.6) (4.6) Total Recognized in Other Comprehensive Income or Regulatory $ 126.3 $ (59.2) $ (20.1) $ (25.6) Amount Recognized in Net Periodic Benefits Cost and Other $ 136.6 $ (66.0) $ (17.4) $ (22.4)

Equity

Equity	12 Months Ended
	Dec. 31, 2022
Equity [Abstract]
Equity	Holders of shares of our common stock are entitled to receive dividends when, as, and if declared by the Board out of funds legally available. The policy of the Board has been to declare cash dividends on a quarterly basis payable on or about the 20th day of February, May, August and November. We have certain debt covenants that could potentially limit the amount of dividends we could pay in order to maintain compliance with these covenants. Refer to Note 15, "Long-Term Debt," for more information. As of December 31, 2022, these covenants did not restrict the amount of dividends that were available to be paid. Dividends paid to preferred shareholders vary based on the series of preferred stock owned. Holders of our shares of common stock are subject to the prior dividend rights of holders of our preferred stock or the depositary shares representing such preferred stock outstanding, and if full dividends have not been declared and paid on all outstanding shares of preferred stock in any dividend period, no dividend may be declared or paid or set aside for payment on our common stock. Common and preferred stock activity for 2022, 2021 and 2020 is described further below. ATM Program. On November 1, 2018, we entered into five separate equity distribution agreements pursuant to which we were able to sell up to an aggregate of $500.0 million of our common stock. Four of these agreements were then amended on August 1, 2019 and one was terminated, pursuant to which we were able to sell up to an aggregate of $434.4 million of our common stock. These equity distribution agreements impacting fiscal year 2020 expired on December 31, 2020. On February 22, 2021, we entered into six separate equity distribution agreements pursuant to which we are able to sell up to an aggregate of $750.0 million of our common stock. On August 9, 2021, under the ATM program, we executed a forward sale agreement, which allowed us to issue a fixed number of shares at a price to be settled in the future. From August 9, 2021 to September 1, 2021, the forward purchaser under our forward sale agreement borrowed 5,941,598 shares from third parties, which the forward purchaser sold, through its affiliated agent, at a weighted average price of $25.25 per share. On November 16, 2022, the forward sale agreement was settled for $23.90 per share, resulting in $142.0 million of net proceeds. As of December 31, 2022, the ATM program had approximately $300.0 million of equity available for issuance. The program expires on December 31, 2023. The following table summarizes our activity under the ATM program. Year Ending December 31, 2022 2021 2020 Number of shares issued 5,941,598 12,525,215 8,459,430 Average price per share $ 25.25 $ 23.95 $ 23.60 Proceeds, net of fees ( in millions) $ 141.9 $ 288.1 $ 196.5 Preferred Stock. On June 11, 2018, we completed the sale of 400,000 shares of 5.650% Series A Fixed-Rate Reset Cumulative Redeemable Perpetual Preferred Stock (the "Series A Preferred Stock") at a price of $1,000 per share. The transaction resulted in $400.0 million of gross proceeds or $393.9 million of net proceeds, after deducting commissions and sale expenses. The Series A Preferred Stock was issued in a private placement pursuant to SEC Rule 144A. On December 13, 2018, we filed a registration statement with the SEC enabling holders to exchange their unregistered shares of Series A Preferred Stock for publicly registered shares with substantially identical terms. Dividends on the Series A Preferred Stock accrue and are cumulative from the date the shares of Series A Preferred Stock were originally issued to, but not including, June 15, 2023 at a rate of 5.650% per annum of the $1,000 liquidation preference per share. On and after June 15, 2023, dividends on the Series A Preferred Stock will accumulate for each five year period at a percentage of the $1,000 liquidation preference equal to the five-year U.S. Treasury Rate plus (i) in respect of each five year period commencing on or after June 15, 2023 but before June 15, 2043, a spread of 2.843% (the “Initial Margin”), and (ii) in respect of each five year period commencing on or after June 15, 2043, the Initial Margin plus 1.000%. The Series A Preferred Stock may be redeemed by us at our option on June 15, 2023, or on each date falling on the fifth anniversary thereafter, or in connection with a ratings event (as defined in the Certificate of Designation of the Series A Preferred Stock). As of December 31, 2022 and 2021, Series A Preferred Stock had $1.0 million of cumulative preferred dividends in arrears, or $2.51 per share. Holders of Series A Preferred Stock generally have no voting rights, except for limited voting rights with respect to (i) potential amendments to our certificate of incorporation that would have a material adverse effect on the existing preferences, rights, powers or duties of the Series A Preferred Stock, (ii) the creation or issuance of any security ranking on a parity with the Series A Preferred Stock if the cumulative dividends payable on then outstanding Series A Preferred Stock are in arrears, or (iii) the creation or issuance of any security ranking senior to the Series A Preferred Stock. The Series A Preferred Stock does not have a stated maturity and is not subject to mandatory redemption or any sinking fund. The Series A Preferred Stock will remain outstanding indefinitely unless repurchased or redeemed by us. Any such redemption would be effected only out of funds legally available for such purposes and will be subject to compliance with the provisions of our outstanding indebtedness. On December 5, 2018, we completed the sale of 20,000,000 depositary shares with an aggregate liquidation preference of $500,000,000 under the Company’s registration statement on Form S-3. Each depositary share represents 1/1,000th ownership interest in a share of our 6.500% Series B Fixed-Rate Reset Cumulative Redeemable Perpetual Preferred Stock, liquidation preference $25,000 per share (equivalent to $25 per depositary share) (the “Series B Preferred Stock"). The transaction resulted in $500.0 million of gross proceeds or $486.1 million of net proceeds, after deducting commissions and sale expenses. Dividends on the Series B Preferred Stock accrue and are cumulative from the date the shares of Series B Preferred Stock were originally issued to, but not including, March 15, 2024 at a rate of 6.500% per annum of the $25,000 liquidation preference per share. On and after March 15, 2024, dividends on the Series B Preferred Stock will accumulate for each five year period at a percentage of the $25,000 liquidation preference equal to the five-year U.S. Treasury Rate plus (i) in respect of each five year period commencing on or after March 15, 2024 but before March 15, 2044, a spread of 3.632% (the “Initial Margin”), and (ii) in respect of each five year period commencing on or after March 15, 2044, the Initial Margin plus 1.000%. The Series B Preferred Stock may be redeemed by us at our option on March 15, 2024, or on each date falling on the fifth anniversary thereafter, or in connection with a ratings event (as defined in the Certificate of Designation of the Series B Preferred Stock). As of December 31, 2022 and 2021, Series B Preferred Stock had $1.4 million of cumulative preferred dividends in arrears, or $72.23 per share. In addition, 20,000 shares of Series B–1 Preferred Stock, par value $0.01 per share, were outstanding as of December 31, 2022. Holders of Series B–1 Preferred Stock are not entitled to receive dividend payments and have no conversion rights. The Series B–1 Preferred Stock is paired with the Series B Preferred Stock and may not be transferred, redeemed or repurchased except in connection with the simultaneous transfer, redemption or repurchase of the underlying Series B Preferred Stock. Holders of Series B Preferred Stock generally have no voting rights, except for limited voting rights with respect to (i) potential amendments to our certificate of incorporation that would have a material adverse effect on the existing preferences, rights, powers or duties of the Series B Preferred Stock, (ii) the creation or issuance of any security ranking on a parity with the Series B Preferred Stock if the cumulative dividends payable on then outstanding Series B Preferred Stock are in arrears, or (iii) the creation or issuance of any security ranking senior to the Series B Preferred Stock. In addition, if and whenever dividends on any shares of Series B Preferred Stock shall not have been declared and paid for at least six dividend periods, whether or not consecutive, the number of directors then constituting our Board of Directors shall automatically be increased by two until all accumulated and unpaid dividends on the Series B Preferred Stock shall have been paid in full, and the holders of Series B-1 Preferred Stock, voting as a class together with the holders of any outstanding securities ranking on a parity with the Series B-1 Preferred Stock and having like voting rights that are exercisable at the time and entitled to vote thereon, shall be entitled to elect the two additional directors. The Series B Preferred Stock does not have a stated maturity and is not subject to mandatory redemption or any sinking fund. The Series B Preferred Stock will remain outstanding indefinitely unless repurchased or redeemed by us. Any such redemption would be effected only out of funds legally available for such purposes and will be subject to compliance with the provisions of our outstanding indebtedness. The following table summarizes preferred stock by outstanding series of shares: Year ended December 31, December 31, December 31, 2022 2021 2020 2022 2021 (in millions except shares and per share amounts) Liquidation Preference Per Share Shares Dividends Declared Per Share Outstanding 5.650% Series A $ 1,000.00 400,000 $ 56.50 $ 56.50 $ 56.50 $ 393.9 $ 393.9 6.500% Series B 25,000.00 20,000 1,625.00 1,625.00 1,625.00 486.1 486.1 Series C (1) $ 1,000.00 862,500 — — — $ 666.5 $ 666.5 (1) The Series C Mandatory Convertible Preferred Stock initially will not bear any dividends. We recorded the initial present value of the purchase contract payments as a liability with a corresponding reduction to preferred stock. Equity Units. On April 19, 2021, we completed the sale of 8.625 million Equity Units, initially consisting of Corporate Units, each with a stated amount of $100. The offering generated net proceeds of $835.5 million, after underwriting and issuance expenses. Each Corporate Unit consists of a forward contract to purchase shares of our common stock in the future and a 1/10th, or 10%, undivided beneficial ownership interest in one share of Series C Mandatory Convertible Preferred Stock, par value $0.01 per share, with a liquidation preference of $1,000 per share. Selected information about the Equity Units is presented below: (in millions except contract rate) Issuance Date Units Issued Total Net Proceeds (1) Purchase Contract Annual Rate Purchase Contract Liability Equity Units April 19, 2021 8.625 $ 835.5 7.75 % $ 168.8 (1) Issuance costs of $27.0 million were recorded on a relative fair value basis as a reduction to preferred stock of $22.5 million and a reduction to the purchase contract liability of $4.5 million. The purchase contract obligates holders to purchase shares of our common stock on December 1, 2023, subject to early settlement in certain situations. The purchase price paid under the purchase contract is $100 and the number of shares to be purchased will be determined under a settlement rate formula based on the volume-weighted average share price of our common stock near the settlement date, subject to a maximum settlement rate. The Series C Mandatory Convertible Preferred Stock will initially be pledged upon issuance as collateral to secure the purchase of common stock under the related purchase contracts. The Series C Mandatory Convertible Preferred Stock is expected to be remarketed prior to December 1, 2023, and each share, unless previously converted, will automatically convert to common stock based on a conversion rate on the mandatory conversion date, which is expected to be on or about March 1, 2024. The conversion rate will be determined based on the volume-weighted average share price of our common stock near the conversion date, subject to a minimum and maximum conversion rate. Prior to December 1, 2023, the Series C Mandatory Convertible Preferred Stock will not bear any dividends and the liquidation preference will not accrete. Following a successful remarketing, dividends may become payable on the Series C Mandatory Convertible Preferred Stock and/or the minimum conversion rate of the Series C Mandatory Convertible Preferred Stock may be increased. If no successful remarketing of the Series C Mandatory Convertible Preferred Stock has previously occurred, effective as of December 1, 2023, the conversion rate will be zero, no shares of our common stock will be delivered upon automatic conversion and each share of Series C Mandatory Convertible Preferred Stock will be automatically transferred to us on the mandatory conversion date without any payment of cash or shares of our common stock thereon. In the event of such a remarketing failure, any shares of Series C Mandatory Convertible Preferred Stock held as part of Corporate Units will be automatically delivered to us on December 1, 2023 in full satisfaction of the relevant holder's obligation under the related purchase contracts. We will pay quarterly contract adjustment payments at the rate of 7.75% per year on the stated amount of $100 per Equity Unit. The contract adjustment payments are payable in cash, shares of our common stock or a combination thereof, at our election. The payment of contract adjustment payments may also be deferred until the purchase contract settlement date, December 1, 2023, at our election. If we exercise our option to defer the payment of contract adjustment payments, then until the deferred contract adjustment payments have been paid, we will not declare or pay any dividends on, or make any distributions on, or redeem, purchase or acquire, or make a liquidation payment with respect to, any shares of our capital stock; make any payment of principal of, or interest or premium, if any, on, or repay, repurchase or redeem any of our debt securities that rank on parity with, or junior to, the contract adjustment payments; or make any guarantee payments under any guarantee by us of securities of any of our subsidiaries if our guarantee ranks on parity with, or junior to, the contract adjustment payments. As of December 31, 2022, no contract adjustment payments have been deferred with quarterly cash payments being remitted to the holders. As of December 31, 2022 and December 31, 2021 the purchase contract liability was $65.0 million and $129.4 million, respectively. Purchase contract payments are recorded against this liability. Accretion of the purchase contract liability is recorded as interest expense. Cash payments of $66.8 million and $41.2 million were made during the years ended December 31, 2022 and 2021, respectively. The Series C Mandatory Convertible Preferred Stock and forward purchase contracts are legally detachable and separately exercisable, however, due to the economic linkage between the forward purchase contract and the Series C Mandatory Convertible Preferred Stock, we have concluded that the ability to separate the Corporate Units is non-substantive. Accordingly, we are accounting for the Corporate Units as a single unit of account. We recorded the initial present value of the purchase contract payments as a liability with a corresponding reduction to preferred stock. This liability is included in "Other accruals"go on the Consolidated Balance Sheets. Refer to Note 5, "Earnings Per Share," for additional information regarding our treatment of the Equity Units for diluted EPS. Under the terms of the Equity Units, assuming no anti-dilution or other adjustments such as a fundamental change, the maximum number of shares of common stock we will issue under the purchase contracts is 35.2 million and maximum number of shares of common stock we will issue under the Series C Mandatory Convertible Preferred Stock is 35.2 million. Had we settled the remaining purchase contract payment balance in shares at December 31, 2022, we would have issued approximately 2.5 million shares. Noncontrolling Interest in Consolidated Subsidiaries. As of December 31, 2022 and 2021, NIPSCO and tax equity partners have completed their cash contributions into the Indiana Crossroads Wind and Rosewater JVs and made initial cash contributions into the Indiana Crossroads Solar JV. Earnings, tax attributes and cash flows are allocated to both NIPSCO and the respective tax equity partners in varying percentages by category and over the life of the partnership. The tax equity partner's contributions, net of these allocations, is represented as a noncontrolling interest within total equity on the Consolidated Balance Sheets. Refer to Note 4, "Variable Interest Entities," for more information.

Share-Based Compensation

Share-Based Compensation	12 Months Ended
	Dec. 31, 2022
Share-Based Payment Arrangement, Noncash Expense [Abstract]
Share-Based Compensation	Prior to May 19, 2020, we issued share-based compensation to employees and non-employee directors under the NiSource Inc. 2010 Omnibus Plan ("2010 Omnibus Plan"), which was most recently approved by stockholders at the Annual Meeting of Stockholders held on May 12, 2015. The 2010 Omnibus Plan provided for awards to employees and non-employee directors of incentive and nonqualified stock options, stock appreciation rights, restricted stock, restricted stock units, performance shares, performance units, cash-based awards and other stock-based awards and superseded the Director Stock Incentive Plan (“Director Plan”) with respect to grants made after the effective date of the 2010 Omnibus Plan. The stockholders approved and adopted the NiSource Inc. 2020 Omnibus Incentive Plan ("2020 Omnibus Plan") at the Annual Meeting of Stockholders held on May 19, 2020. The 2020 Omnibus Plan provides for awards to employees and non-employee directors of incentive and nonqualified stock options, stock appreciation rights, restricted stock, restricted stock units, performance shares, performance units, cash-based awards and other stock-based awards and supersedes the 2010 Omnibus Plan with respect to grants made after the effective date of the 2020 Omnibus Plan. The 2020 Omnibus Plan provides that the number of shares of common stock of NiSource available for awards is 10,000,000 plus the number of shares subject to outstanding awards that expire or terminate for any reason that were granted under the 2020 Omnibus Plan, the 2010 Omnibus Plan or any other equity plan under which awards were outstanding as of May 19, 2020. At December 31, 2022, there were 8,704,201 shares available for future awards under the 2020 Omnibus Plan. We recognized stock-based employee compensation expense of $19.0 million, $16.7 million and $13.5 million, during 2022, 2021 and 2020, respectively, as well as related tax benefits of $3.6 million, $4.0 million and $3.3 million, respectively. We recognized related excess tax benefit from the distribution of vested share-based employee compensation of $0.4 million in 2022 and 2021, and excess tax expense of $0.4 million in 2020. As of December 31, 2022, the total remaining unrecognized compensation cost related to non-vested awards amounted to $27.0 million, which will be amortized over the weighted-average remaining requisite service period of 1.8 years. Restricted Stock Units and Restricted Stock . We granted 477,292, 285,755, and 235,100 restricted stock units and shares of restricted stock to employees, subject to service conditions in 2022, 2021, and 2020, respectively. The total grant date fair value of the restricted stock units and shares of restricted stock during 2022, 2021, and 2020, respectively, was $12.5 million, $5.7 million, and $6.1 million based on the average market price of our common stock at the date of each grant less the present value of any dividends not received during the vesting period, which will be expensed over the vesting period which is generally three years. As of December 31, 2022, 444,646, 218,465, and 135,404 non-vested restricted stock units and shares of restricted stock granted in 2022, 2021, and 2020, respectively, were outstanding. If an employee terminates employment before the service conditions lapse under the 2020, 2021 or 2022 awards due to (1) retirement or disability (as defined in the award agreement), or (2) death, the service conditions will lapse on the date of such termination with respect to a pro rata portion of the restricted stock units and shares of restricted stock based upon the percentage of the service period satisfied between the grant date and the date of the termination of employment. In the event of a change in control (as defined in the award agreement), all unvested shares of restricted stock and restricted stock units awarded will immediately vest upon termination of employment occurring in connection with a change in control. Termination due to any other reason will result in all unvested shares of restricted stock and restricted stock units awarded being forfeited effective on the employee’s date of termination. A summary of our restricted stock unit award transactions for the year ended December 31, 2022 is as follows: (shares) Restricted Stock Weighted Average Non-vested at December 31, 2021 572,154 22.72 Granted 477,292 26.29 Forfeited (133,367) 23.48 Vested (117,564) 24.44 Non-vested at December 31, 2022 798,515 24.48 Employee Performance Shares . We granted 566,086 performance shares subject to service, performance and/or market-based vesting conditions in 2022. The performance conditions for these shares are based on the achievement of one non-GAAP financial measure, and/or achievement of relative total shareholder return, outlined below. The number of shares that are eligible to vest based on these performance conditions will be adjusted based on performance of the magnifier framework for 2022 awards, outlined below. The operational magnifier framework for 2022 performance shares consists of three areas of focus, including safety, environment, and DE&I, representing 20%, 10% and 10%, respectively. The financial measure is cumulative net operating earnings per share ("NOEPS"), which we define as income from continuing operations adjusted for certain items. Relative total shareholder return, a market-based vesting condition, which we define as the annualized growth in dividends and share price of a share of our common stock (calculated using a 20 trading day average of our closing price over the performance period, approximately) compared to the total shareholder return of a predetermined peer group of companies. A relative shareholder return result within the first quartile will result in an increase in the NOEPS shares of 25%, while a relative shareholder return result within the fourth quartile will result in a decrease of 25%. A Monte Carlo analysis was used to value the portion of these awards dependent on the market-based vesting condition. The grant date fair value of the NOEPS shares is based on the closing stock price of our common stock at the date of each grant, which will be expensed over the requisite service period of three years. See table below for further details on these awards. In 2021, we granted 973,885 performance shares subject to service, performance and/or market-based vesting conditions. With respect to 390,941 performance shares granted, the performance conditions are based on the achievement of relative total shareholder return. The number of shares that are eligible to vest based on the Company's relative total shareholder return performance will be adjusted based on a performance magnifier related to safety. A Monte Carlo analysis was used to value the portion of these awards dependent on the market-based vesting condition. The grant date fair value of the NOEPS shares is based on the closing stock price of our common stock at the date of each grant, which will be expensed over the requisite service period of three years. See table below for further details on these awards. With respect to the remaining 582,944 performance shares granted in 2021, the performance conditions are based on the achievement of one non-GAAP financial measure, and/or achievement of relative total shareholder return. The number of shares that are eligible to vest based on these performance conditions will be adjusted based on performance of the magnifier framework for 2021 awards. The operational magnifier framework for 2021 performance shares consists of three areas of focus including safety, environment, and DE&I, representing 20%, 10% and 10%, respectively. We granted 528,729 performance shares subject to service, performance and market-based vesting conditions in 2020. The performance conditions are based on the achievement of one non-GAAP financial measure, relative total shareholder return and additional operational measures as outlined below. If a threshold level of cumulative NOEPS financial performance is achieved, additional operational measures, which we refer to as the customer value framework and which consists of equally weighted areas of focus, apply. Each area of focus represents an equal portion of the customer value framework shares, and the targets for all areas of focus must be met for the customer value framework shares to vest at 100%. The grant date fair value of the customer value framework shares is based on the average market price of our common stock on the grant date of each award less the present value of dividends not received during the vesting period, which will be expensed over the requisite service period of three years for those customer value framework shares that are granted. See table below for further details on these awards. For the 2020 awards, the customer value framework consists of four equally weighted areas of focus including safety, customer satisfaction, culture and environmental, each representing 25% of the customer value framework shares. The following table presents details of the performance awards described above. Award Year Service Conditions Lapse date Performance Period Award Conditions Shares outstanding at 12/31/2022 (shares) Grant Date Fair Value (in millions) 2022 02/28/25 01/01/2022- Non-GAAP Financial Measure 245,445 $ 7.4 Relative Total Shareholder Return 245,445 $ 10.6 2021 02/28/24 01/01/2021- Non-GAAP Financial Measure 192,119 $ 6.5 Relative Total Shareholder Return 192,119 $ 6.7 Relative Total Shareholder Return 88,541 $ 3.2 02/28/23 01/01/2021- 12/31/2022 Relative Total Shareholder Return 179,703 $ 4.8 2020 02/28/23 01/01/2020- 12/31/2022 Non-GAAP Financial Measure 294,424 $ 11.7 Operational Measures 67,943 $ 2.6 A summary of our performance award transactions for the year ended December 31, 2022 is as follows: (shares) Performance Weighted Average Non-vested at December 31, 2021 1,798,151 23.78 Granted 566,086 31.65 Forfeited (427,607) 24.34 Vested (430,890) 25.44 Non-vested at December 31, 2022 1,505,740 26.10 Non-employee Director Awards . As of May 19, 2020, awards to non-employee directors may be made only under the 2020 Omnibus Plan. Currently, restricted stock units are granted annually to non-employee directors, subject to a non-employee director’s election to defer receipt of such restricted stock unit award. The non-employee director’s annual award of restricted stock units vest on the first anniversary of the grant date subject to special pro-rata vesting rules in the event of retirement or disability (as defined in the award agreement), or death. The vested restricted stock units are payable as soon as practicable following vesting except as otherwise provided pursuant to the non-employee director’s deferral election. Certain restricted stock units remain outstanding from the 2010 Omnibus Plan and the Director Plan. All such awards are fully vested and shall be distributed to the directors upon their separation from the Board. As of December 31, 2022, 228,604 restricted stock units are outstanding to non-employee directors under either the 2020 Omnibus Plan, the 2010 Omnibus Plan or the Director Plan. Of this amount, 63,215 restricted stock units are unvested and expected to vest. 401(k) Match, Profit Sharing and Company Contribution. Eligible salaried employees hired after January 1, 2010 and hourly and union employees hired after January 1, 2013 receive a non-elective company contribution of 3% of eligible pay payable in cash or shares of NiSource common stock. We also have a voluntary 401(k) savings plan covering eligible union and nonunion employees that allows for periodic discretionary matches as a percentage of each participant’s contributions payable in cash or shares. Further, we have a retirement savings plan that provides for discretionary profit sharing contributions to eligible employees. For the years ended December 31, 2022, 2021 and 2020, we recognized 401(k) match, profit sharing and non-elective contribution expense of $39.1 million, $39.1 million and $37.8 million, respectively.

Short-Term Borrowings

Short-Term Borrowings	12 Months Ended
	Dec. 31, 2022
Short-Term Debt [Abstract]
Short-Term Borrowings	We generate short-term borrowings from our revolving credit facility, commercial paper program, accounts receivable transfer programs, and term credit agreement. Each of these borrowing sources is described further below. Revolving Credit Facility. We maintain a revolving credit facility to fund ongoing working capital requirements, including the provision of liquidity support for our commercial paper program, provide for issuance of letters of credit, and also for general corporate purposes. Our revolving credit facility has a program limit of $1.85 billion and is comprised of a syndicate of banks. On February 18, 2022, we extended the termination date of our revolving credit facility to February 18, 2027. At December 31, 2022 and 2021, we had no outstanding borrowings under this facility. Commercial Paper Program. Our commercial paper program has a program limit of up to $1.5 billion. We had $415.0 million and $560.0 million of commercial paper outstanding with weighted-average interest rates of 4.60% and 0.24% as of December 31, 2022 and 2021, respectively. Accounts Receivable Transfer Programs. Columbia of Ohio, NIPSCO, and Columbia of Pennsylvania each maintain a receivables agreement whereby they transfer their customer accounts receivables to third party financial institutions through wholly-owned and consolidated special purpose entities. The three agreements expire between May 2023 and October 2023 and may be further extended if mutually agreed to by the parties thereto. All receivables transferred to third parties are valued at face value, which approximates fair value due to their short-term nature. The amount of the undivided percentage ownership interest in the accounts receivables transferred is determined in part by required loss reserves under the agreements. Transfers of accounts receivable are accounted for as secured borrowings resulting in the recognition of short-term borrowings on the Consolidated Balance Sheets. As of December 31, 2022, the maximum amount of debt that could be recognized related to our accounts receivable programs is $500.0 million. We had $347.2 million and no short-term borrowings related to the securitization transactions as of December 31, 2022 and 2021, respectively. For the years ended December 31, 2022 and 2021, $347.2 million and zero, respectively, were recorded as cash flows from financing activities related to the change in short-term borrowings due to securitization transactions. For the accounts receivable transfer programs, we pay used facility fees for amounts borrowed, unused commitment fees for amounts not borrowed, and upfront renewal fees. Fees associated with the securitization transactions were $2.5 million, $1.4 million, and $2.6 million for the years ended December 31, 2022, 2021 and 2020, respectively. Columbia of Ohio, NIPSCO and Columbia of Pennsylvania remain responsible for collecting on the receivables securitized, and the receivables cannot be transferred to another party. Term Credit Agreement. On December 20, 2022, we entered into a $1.0 billion term credit agreement with a syndicate of banks. The agreement matures on December 19, 2023 and interest charged on the borrowings depends on the variable rate structure elected at the time of each borrowing. The available variable rate structures from which we can choose are defined in the agreement. Under the agreement, we borrowed $1.0 billion on December 20, 2022 with an interest rate of SOFR plus 105 basis points. We had $1.0 billion outstanding with an interest rate of 5.37% as of December 31, 2022. Items listed above, excluding the term credit agreement, are presented net in the Statements of Consolidated Cash Flows as their maturities are less than 90 days.

Leases

Leases	12 Months Ended
	Dec. 31, 2022
Leases [Abstract]
Lessee, Operating Leases	Lease Descriptions. We are the lessee for substantially all of our leasing activity, which includes operating and finance leases for corporate and field offices, railcars, fleet vehicles and certain IT assets. Our corporate and field office leases have remaining lease terms between 1 and 21 years with options to renew the leases for up to 25 years. We lease railcars to transport coal to and from our electric generation facilities in Indiana. Our railcars are specifically identified in the lease agreements which have remaining lease terms between 1 and 5 years with options to renew for 1 year. Our fleet vehicles include trucks, trailers and equipment that have been customized specifically for use in the utility industry. We lease fleet vehicles for 1 year terms, after which we have the option to extend on a month-to-month basis or terminate with written notice. We elected the short-term lease practical expedient, allowing us to not recognize ROU assets or lease liabilities for all leases with a term of 12 months or less. ROU assets and liabilities on our Consolidated Balance Sheets do not include obligations for possible fleet vehicle lease renewals beyond the initial lease term. While we have the ability to renew these leases beyond the initial term, we are not reasonably certain to do so. We lease the majority of our IT assets under 4 year lease terms. Ownership of leased IT assets is transferred to us at the end of the lease term. We have not provided material residual value guarantees for our leases, nor do our leases contain material restrictions or covenants. Lease contracts containing renewal and termination options are mostly exercisable at our sole discretion. Certain of our real estate and railcar leases include renewal periods in the measurement of the lease obligation if we have deemed the renewals reasonably certain to be exercised. With respect to service contracts involving the use of assets, if we have the right to direct the use of the asset and obtain substantially all economic benefits from the use of an asset, we account for the service contract as a lease. Unless specifically provided to us by the lessor, we utilize NiSource's collateralized incremental borrowing rate commensurate to the lease term as the discount rate for all of our leases. ASC 842 permits a lessee, by class of underlying asset, not to separate nonlease components from lease components. Our policy is to apply this expedient for our leases of fleet vehicles, IT assets and railcars when calculating their respective lease liabilities. Lease costs for the years ended December 31, 2022 and December 31, 2021 are presented in the table below. These costs include both amounts recognized in expense and amounts capitalized as part of the cost of another asset. Income statement presentation for these costs (when ultimately recognized on the income statement) is also included: Year Ended December 31, (in millions) Income Statement Classification 2022 2021 Finance lease cost Amortization of right-of-use assets Depreciation and amortization $ 31.9 $ 28.8 Interest on lease liabilities Interest expense, net 8.5 9.4 Total finance lease cost 40.4 38.2 Operating lease cost Operation and maintenance 10.4 15.6 Total lease cost $ 50.8 $ 53.8 Our right-of-use assets and liabilities are presented in the following lines on the Consolidated Balance Sheets: At December 31, (in millions) Balance Sheet Classification 2022 2021 Assets Finance leases Net Property, Plant and Equipment $ 153.4 $ 165.7 Operating leases Deferred charges and other 35.7 33.8 Total leased assets $ 189.1 199.5 Liabilities Current Finance leases Current portion of long-term debt $ 30.0 28.1 Operating leases Other accruals 4.8 6.7 Noncurrent Finance leases Long-term debt, excluding amounts due within one year 144.7 157.5 Operating leases Other noncurrent liabilities 31.9 27.9 Total lease liabilities $ 211.4 $ 220.2 Other pertinent information related to leases was as follows: Year Ended December 31, (in millions) 2022 2021 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows used for finance leases $ 8.6 $ 9.4 Operating cash flows used for operating leases 10.3 15.4 Financing cash flows used for finance leases 30.3 25.7 Right-of-use assets obtained in exchange for lease obligations Finance leases 19.3 22.4 Operating leases $ 8.8 $ 6.0 December 31, 2022 December 31, 2021 Weighted-average remaining lease term (years) Finance leases 9.9 10.6 Operating leases 7.7 8.5 Weighted-average discount rate Finance leases 5.1 % 5.0 % Operating leases 4.0 % 3.7 % Maturities of our lease liabilities as of December 31, 2022 were as follows: As of December 31, 2022, (in millions) Total Finance Leases Operating Leases 2023 $ 46.8 $ 38.9 $ 7.9 2024 37.3 30.9 6.4 2025 30.3 24.5 5.8 2026 24.7 19.4 5.3 2027 19.9 15.4 4.5 Thereafter 110.8 97.4 13.4 Total lease payments 269.8 226.5 43.3 Less: Imputed interest (58.4) (51.8) (6.6) Total $ 211.4 $ 174.7 $ 36.7 Reported as of December 31, 2022 Short-term lease liabilities 34.8 30.0 4.8 Long-term lease liabilities 176.6 144.7 31.9 Total lease liabilities $ 211.4 $ 174.7 $ 36.7
Lessee, Finance Leases	Lease Descriptions. We are the lessee for substantially all of our leasing activity, which includes operating and finance leases for corporate and field offices, railcars, fleet vehicles and certain IT assets. Our corporate and field office leases have remaining lease terms between 1 and 21 years with options to renew the leases for up to 25 years. We lease railcars to transport coal to and from our electric generation facilities in Indiana. Our railcars are specifically identified in the lease agreements which have remaining lease terms between 1 and 5 years with options to renew for 1 year. Our fleet vehicles include trucks, trailers and equipment that have been customized specifically for use in the utility industry. We lease fleet vehicles for 1 year terms, after which we have the option to extend on a month-to-month basis or terminate with written notice. We elected the short-term lease practical expedient, allowing us to not recognize ROU assets or lease liabilities for all leases with a term of 12 months or less. ROU assets and liabilities on our Consolidated Balance Sheets do not include obligations for possible fleet vehicle lease renewals beyond the initial lease term. While we have the ability to renew these leases beyond the initial term, we are not reasonably certain to do so. We lease the majority of our IT assets under 4 year lease terms. Ownership of leased IT assets is transferred to us at the end of the lease term. We have not provided material residual value guarantees for our leases, nor do our leases contain material restrictions or covenants. Lease contracts containing renewal and termination options are mostly exercisable at our sole discretion. Certain of our real estate and railcar leases include renewal periods in the measurement of the lease obligation if we have deemed the renewals reasonably certain to be exercised. With respect to service contracts involving the use of assets, if we have the right to direct the use of the asset and obtain substantially all economic benefits from the use of an asset, we account for the service contract as a lease. Unless specifically provided to us by the lessor, we utilize NiSource's collateralized incremental borrowing rate commensurate to the lease term as the discount rate for all of our leases. ASC 842 permits a lessee, by class of underlying asset, not to separate nonlease components from lease components. Our policy is to apply this expedient for our leases of fleet vehicles, IT assets and railcars when calculating their respective lease liabilities. Lease costs for the years ended December 31, 2022 and December 31, 2021 are presented in the table below. These costs include both amounts recognized in expense and amounts capitalized as part of the cost of another asset. Income statement presentation for these costs (when ultimately recognized on the income statement) is also included: Year Ended December 31, (in millions) Income Statement Classification 2022 2021 Finance lease cost Amortization of right-of-use assets Depreciation and amortization $ 31.9 $ 28.8 Interest on lease liabilities Interest expense, net 8.5 9.4 Total finance lease cost 40.4 38.2 Operating lease cost Operation and maintenance 10.4 15.6 Total lease cost $ 50.8 $ 53.8 Our right-of-use assets and liabilities are presented in the following lines on the Consolidated Balance Sheets: At December 31, (in millions) Balance Sheet Classification 2022 2021 Assets Finance leases Net Property, Plant and Equipment $ 153.4 $ 165.7 Operating leases Deferred charges and other 35.7 33.8 Total leased assets $ 189.1 199.5 Liabilities Current Finance leases Current portion of long-term debt $ 30.0 28.1 Operating leases Other accruals 4.8 6.7 Noncurrent Finance leases Long-term debt, excluding amounts due within one year 144.7 157.5 Operating leases Other noncurrent liabilities 31.9 27.9 Total lease liabilities $ 211.4 $ 220.2 Other pertinent information related to leases was as follows: Year Ended December 31, (in millions) 2022 2021 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows used for finance leases $ 8.6 $ 9.4 Operating cash flows used for operating leases 10.3 15.4 Financing cash flows used for finance leases 30.3 25.7 Right-of-use assets obtained in exchange for lease obligations Finance leases 19.3 22.4 Operating leases $ 8.8 $ 6.0 December 31, 2022 December 31, 2021 Weighted-average remaining lease term (years) Finance leases 9.9 10.6 Operating leases 7.7 8.5 Weighted-average discount rate Finance leases 5.1 % 5.0 % Operating leases 4.0 % 3.7 % Maturities of our lease liabilities as of December 31, 2022 were as follows: As of December 31, 2022, (in millions) Total Finance Leases Operating Leases 2023 $ 46.8 $ 38.9 $ 7.9 2024 37.3 30.9 6.4 2025 30.3 24.5 5.8 2026 24.7 19.4 5.3 2027 19.9 15.4 4.5 Thereafter 110.8 97.4 13.4 Total lease payments 269.8 226.5 43.3 Less: Imputed interest (58.4) (51.8) (6.6) Total $ 211.4 $ 174.7 $ 36.7 Reported as of December 31, 2022 Short-term lease liabilities 34.8 30.0 4.8 Long-term lease liabilities 176.6 144.7 31.9 Total lease liabilities $ 211.4 $ 174.7 $ 36.7

Fair Value

Fair Value	12 Months Ended
	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Fair Value	A. Fair Value Measurements Recurring Fair Value Measurements The following tables present financial assets and liabilities measured and recorded at fair value on our Consolidated Balance Sheets on a recurring basis and their level within the fair value hierarchy as of December 31, 2022 and December 31, 2021: Recurring Fair Value Measurements December 31, 2022 ( in millions ) Quoted Prices Significant Other Significant Balance as of December 31, 2022 Assets Risk management assets $ — $ 84.8 $ — $ 84.8 Available-for-sale debt securities — 151.6 — 151.6 Total $ — $ 236.4 $ — $ 236.4 Liabilities Risk management liabilities — 3.0 — 3.0 Total $ — $ 3.0 $ — $ 3.0 Recurring Fair Value Measurements December 31, 2021 ( in millions ) Quoted Prices Significant Other Significant Balance as of December 31, 2021 Assets Risk management assets $ — $ 24.4 $ — $ 24.4 Available-for-sale debt securities — 171.8 — 171.8 Total $ — $ 196.2 $ — $ 196.2 Liabilities Risk management liabilities $ — $ 144.2 $ — $ 144.2 Total $ — $ 144.2 $ — $ 144.2 Risk Management Assets and Liabilities. Risk management assets and liabilities include interest rate swaps, exchange-traded NYMEX futures and NYMEX options and non-exchange-based forward purchase contracts. Level 1- When utilized, exchange-traded derivative contracts are based on unadjusted quoted prices in active markets and are classified within Level 1. These financial assets and liabilities are secured with cash on deposit with the exchange; therefore, nonperformance risk has not been incorporated into these valuations. These financial assets and liabilities are deemed to be cleared and settled daily by NYMEX as the related cash collateral is posted with the exchange. As a result of this exchange rule, NYMEX derivatives are considered to have no fair value at the balance sheet date for financial reporting purposes, and are presented in Level 1 net of posted cash; however, the derivatives remain outstanding and are subject to future commodity price fluctuations until they are settled in accordance with their contractual terms. Level 2- Certain non-exchange-traded derivatives are valued using broker or over-the-counter, on-line exchanges. In such cases, these non-exchange-traded derivatives are classified within Level 2. Non-exchange-based derivative instruments include swaps, forwards, and options. In certain instances, these instruments may utilize models to measure fair value. We use a similar model to value similar instruments. Valuation models utilize various inputs that include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, other observable inputs for the asset or liability and market-corroborated inputs, (i.e., inputs derived principally from or corroborated by observable market data by correlation or other means). Where observable inputs are available for substantially the full term of the asset or liability, the instrument is categorized within Level 2. Level 3- Certain derivatives trade in less active markets with a lower availability of pricing information and models may be utilized in the valuation. When such inputs have a significant impact on the measurement of fair value, the instrument is categorized within Level 3. Credit risk is considered in the fair value calculation of derivative instruments that are not exchange-traded. Credit exposures are adjusted to reflect collateral agreements that reduce exposures. As of December 31, 2022 and 2021, there were no material transfers between fair value hierarchies. Additionally, there were no changes in the method or significant assumptions used to estimate the fair value of our financial instruments. NIPSCO has entered into long-term forward natural gas purchase instruments to lock in a fixed price for its natural gas customers. We value these contracts using a pricing model that incorporates market-based information when available, as these instruments trade less frequently and are classified within Level 2 of the fair value hierarchy. For additional information, see Note 10, “Risk Management Activities.” Available-for-Sale Debt Securities. Available-for-sale debt securities are investments pledged as collateral for trust accounts related to our wholly-owned insurance company. We value U.S. Treasury, corporate debt and mortgage-backed securities using a matrix pricing model that incorporates market-based information. These securities trade less frequently and are classified within Level 2. Our available-for-sale debt securities impairments are recognized periodically using an allowance approach. At each reporting date, we utilize a quantitative and qualitative review process to assess the impairment of available-for-sale debt securities at the individual security level. For securities in a loss position, we evaluate our intent to sell or whether it is more-likely-than-not that we will be required to sell the security prior to the recovery of its amortized cost. If either criteria is met, the loss is recognized in earnings immediately, with the offsetting entry to the carrying value of the security. If both criteria are not met, we perform an analysis to determine whether the unrealized loss is related to credit factors. The analysis focuses on a variety of factors that include, but are not limited to, downgrade on ratings of the security, defaults in the current reporting period or projected defaults in the future, the security's yield spread over treasuries, and other relevant market data. If the unrealized loss is not related to credit factors, it is included in other comprehensive income. If the unrealized loss is related to credit factors, the loss is recognized as credit loss expense in earnings during the period, with an offsetting entry to the allowance for credit losses. The amount of the credit loss recorded to the allowance account is limited by the amount at which the security's fair value is less than its amortized cost basis. If certain amounts recorded in the allowance for credit losses are deemed uncollectible, the allowance on the uncollectible portion will be charged off, with an offsetting entry to the carrying value of the security. Subsequent improvements to the estimated credit losses of available-for-sale debt securities will be recognized immediately in earnings. As of December 31, 2022 and December 31, 2021, we recorded $0.9 million and $0.2 million, respectively, as an allowance for credit losses on available-for-sale debt securities as a result of the analysis described above. Continuous credit monitoring and portfolio credit balancing mitigates our risk of credit losses on our available-for-sale debt securities. The amortized cost, gross unrealized gains and losses, allowance for credit losses, and fair value of available-for-sale securities at December 31, 2022 and 2021 were: December 31, 2022 (in millions) Amortized Gross Gross Unrealized Losses (1) Allowance for Credit Losses Fair Value Available-for-sale debt securities U.S. Treasury debt securities $ 67.7 $ — $ (4.5) $ — $ 63.2 Corporate/Other debt securities 99.0 — (9.7) (0.9) 88.4 Total $ 166.7 $ — $ (14.2) $ (0.9) $ 151.6 December 31, 2021 (in millions) Amortized Gross Gross Unrealized Losses (2) Allowance for Credit Losses Fair Value Available-for-sale debt securities U.S. Treasury debt securities $ 52.8 $ 0.1 $ (0.4) $ — $ 52.5 Corporate/Other debt securities 116.5 3.7 (0.7) (0.2) 119.3 Total $ 169.3 $ 3.8 $ (1.1) $ (0.2) $ 171.8 (1) Fair value of U.S. Treasury debt securities and Corporate/Other debt securities in an unrealized loss position without an allowance for credit losses is $61.0 and $85.5 million, respectively, at December 31, 2022. (2) Fair value of U.S. Treasury debt securities and Corporate/Other debt securities in an unrealized loss position without an allowance for credit losses is $36.2 million and $35.4 million, respectively, at December 31, 2021. Realized gains and losses on available-for-sale securities were immaterial for the year-ended December 31, 2022 and 2021. The cost of maturities sold is based upon specific identification. At December 31, 2022, approximately $5.2 million of U.S. Treasury debt securities and approximately $5.8 million of Corporate/Other debt securities have maturities of less than a year. There are no material items in the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis for the years ended December 31, 2022 and 2021. Non-recurring Fair Value Measurements We measure the fair value of certain assets, including goodwill, on a non-recurring basis, typically when events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. Purchase Contract Liability. On April 19, 2021, we recorded the purchase contract liability at fair value using a discounted cash flow method and observable, market-corroborated inputs. This estimate was made at April 19, 2021, and will not be remeasured at each subsequent balance sheet date. It has been categorized within Level 2 of the fair value hierarchy. Refer to Note 13, "Equity," for additional information. B. Other Fair Value Disclosures for Financial Instruments . The carrying amount of cash and cash equivalents, restricted cash, notes receivable, customer deposits and short-term borrowings is a reasonable estimate of fair value due to their liquid or short-term nature. Our long-term borrowings are recorded at historical amounts. The following method and assumptions were used to estimate the fair value of each class of financial instruments. Long-term debt . The fair value of outstanding long-term debt is estimated based on the quoted market prices for the same or similar securities. Certain premium costs associated with the early settlement of long-term debt are not taken into consideration in determining fair value. These fair value measurements are classified within Level 2 of the fair value hierarchy. For the years ended December 31, 2022 and 2021, there was no change in the method or significant assumptions used to estimate the fair value of long-term debt. The carrying amount and estimated fair values of these financial instruments were as follows: At December 31, (in millions) Carrying Amount 2022 Estimated Fair Value 2022 Carrying Amount 2021 Estimated Fair Value 2021 Long-term debt (including current portion) $ 9,553.6 $ 8,479.4 $ 9,241.5 $ 10,415.7

Other Commitments And Contingen

Other Commitments And Contingencies	12 Months Ended
	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Other Commitments And Contingencies	Contractual Obligations. We have certain contractual obligations requiring payments at specified periods. The obligations include long-term debt, lease obligations, energy commodity contracts and obligations for various services including pipeline capacity and outsourcing of IT services. The total contractual obligations in existence at December 31, 2022 and their maturities were: (in millions) Total 2023 2024 2025 2026 2027 After Long-term debt (1) $ 9,455.0 $ — $ — $ 1,260.0 $ — $ 1,090.0 $ 7,105.0 Interest payments on long-term debt 5,890.4 351.6 351.6 351.6 339.1 319.7 4,176.8 Finance leases (2) 226.5 38.9 30.9 24.5 19.4 15.4 97.4 Operating leases (3) 43.3 7.9 6.4 5.8 5.3 4.5 13.4 Energy commodity contracts 231.7 119.7 76.0 36.0 — — — Service obligations: Pipeline service obligations 2,484.9 642.2 556.9 410.5 337.2 328.8 209.3 IT service obligations 177.4 71.9 50.0 41.3 11.4 2.8 — Other liabilities (4) 654.2 612.5 6.2 5.9 5.2 5.2 19.2 Total contractual obligations $ 19,163.4 $ 1,844.7 $ 1,078.0 $ 2,135.6 $ 717.6 $ 1,766.4 $ 11,621.1 (1) Long-term debt balance excludes unamortized issuance costs and discounts of $76.1 million. (2) Finance lease payments shown above are inclusive of interest totaling $51.8 million. (3) Operating lease payments shown above are inclusive of interest totaling $6.6 million. Operating lease balances do not include obligations for possible fleet vehicle lease renewals beyond the initial lease term. While we have the ability to renew these leases beyond the initial term, we are not reasonably certain to do so as they are renewed month-to-month after the first year. (4) Other liabilities shown above are inclusive of the Rosewater, Indiana Crossroads Wind, and Indiana Crossroads Solar Developer payments due in 2023 and Equity Unit purchase contract liability payments to be made in 2023. Purchase and Service Obligations. We have entered into various purchase and service agreements whereby we are contractually obligated to make certain minimum payments in future periods. Our purchase obligations are for the purchase of physical quantities of natural gas, electricity and coal. Our service agreements encompass a broad range of business support and maintenance functions which are generally described below. Our subsidiaries have entered into various energy commodity contracts to purchase physical quantities of natural gas, electricity and coal. These amounts represent the minimum quantity of these commodities we are obligated to purchase at both fixed and variable prices. To the extent contractual purchase prices are variable, obligations disclosed in the table above are valued at market prices as of December 31, 2022. NIPSCO has power purchase arrangements representing a total of 500 MW of wind power, with contracts expiring between 2024 and 2040. No minimum quantities are specified within these agreements due to the variability of electricity generation from wind, so no amounts related to these contracts are included in the table above. Upon early termination of one of these agreements by NIPSCO for any reason (other than material breach by the counterparties), NIPSCO may be required to pay a termination charge that could be material depending on the events giving rise to termination and the timing of the termination. We have pipeline service agreements that provide for pipeline capacity, transportation and storage services. These agreements, which have expiration dates ranging from 2023 to 2038, require us to pay fixed monthly charges. NIPSCO has contracts with three major rail operators providing coal transportation services for which there are certain minimum payments. These service contracts extend for various periods through 2028. We have executed agreements with multiple IT service providers. The agreements extend for various periods through 2028. B. Guarantees and Indemnities . We and certain of our subsidiaries enter into various agreements providing financial or performance assurance to third parties on behalf of certain subsidiaries as part of normal business. Such agreements include guarantees and stand-by letters of credit. These agreements are entered into primarily to support or enhance the creditworthiness otherwise attributed to a subsidiary on a stand-alone basis, thereby facilitating the extension of sufficient credit to accomplish the subsidiaries’ intended commercial purposes. At December 31, 2022 and 2021, we issued stand-by letters of credit of $10.2 million and $18.9 million, respectively, for the benefit of third parties. We provide guarantees related to our future performance under BTAs for our renewable generation projects. At December 31, 2022 and 2021, our guarantees for multiple BTAs totaled $841.6 million and $288.9 million, respectively. The amount of each guaranty will decrease upon the substantial completion of the construction of the facilities. See “- F. Other Matters - Generation Transition,” below for more information. C. Legal Proceedings . On September 13, 2018, a series of fires and explosions occurred in Lawrence, Andover, and North Andover, Massachusetts related to the delivery of natural gas by Columbia of Massachusetts (the "Greater Lawrence Incident"). We have been subject to inquiries and investigations by government authorities and regulatory agencies regarding the Greater Lawrence Incident. On February 26, 2020, the Company and Columbia of Massachusetts entered into agreements with the U.S. Attorney's Office for the District of Massachusetts to resolve the U.S. Attorney's Office’s investigation relating to the Greater Lawrence Incident, as described below. The Company and Columbia of Massachusetts entered into an agreement with the Massachusetts Attorney General’s Office (among other parties) to resolve the Massachusetts DPU and the Massachusetts Attorney General’s Office investigations, that was approved by the Massachusetts DPU on October 7, 2020 as part of the sale of the Massachusetts Business to Eversource. U.S. Department of Justice Investigation. On February 26, 2020, the Company and Columbia of Massachusetts entered into agreements with the U.S. Attorney's Office to resolve the U.S. Attorney's Office's investigation relating to the Greater Lawrence Incident. Columbia of Massachusetts agreed to plead guilty in the United States District Court for the District of Massachusetts (the "Court") to violating the Natural Gas Pipeline Safety Act (the “Plea Agreement”), and the Company entered into a Deferred Prosecution Agreement (the "DPA"). On March 9, 2020, Columbia of Massachusetts entered its guilty plea pursuant to the Plea Agreement. The Court sentenced Columbia of Massachusetts on June 23, 2020, in accordance with the terms of the Plea Agreement (as modified). On June 23, 2021, the Court terminated Columbia of Massachusetts' period of probation under the Plea Agreement, which marked the completion of all terms of the Plea Agreement. Under the DPA, the U.S. Attorney's Office agreed to defer prosecution of the Company in connection with the Greater Lawrence Incident for a three-year period ending on February 26, 2023 (which three-year period may be extended for twelve (12) months upon the U.S. Attorney's Office's determination of a breach of the DPA) subject to certain obligations of the Company, including, but not limited to, the Company's agreement, as to each of the Company's subsidiaries involved in the distribution of gas through pipeline facilities in Massachusetts, Indiana, Ohio, Pennsylvania, Maryland, Kentucky and Virginia to implement and adhere to each of the recommendations from the NTSB stemming from the Greater Lawrence Incident. Pursuant to the DPA, if the Company complies with all of its obligations under the DPA, the U.S. Attorney's Office will not file any criminal charges against the Company related to the Greater Lawrence Incident. Private Actions. Various lawsuits, including several purported class action lawsuits, were filed by various affected residents or businesses in Massachusetts state courts against the Company and/or Columbia of Massachusetts in connection with the Greater Lawrence Incident. On March 12, 2020, the Court granted final approval of the settlement of the consolidated class action. With respect to claims not included in the consolidated class action, many of the asserted wrongful death and bodily injury claims have been settled, and we continue to discuss potential settlements with remaining claimants. The outcomes and impacts of such private actions are uncertain at this time. FERC Investigation. In April 2022, NIPSCO was notified that the FERC Office of Enforcement (“OE”) is conducting an investigation of an industrial customer for allegedly manipulating the MISO Demand Response (“DR”) market. The customer and NIPSCO are cooperating with the investigation. If the OE ultimately were to seek to require the customer to repay any portion of the DR revenue received from MISO, it is reasonably possible that the OE would also seek to require NIPSCO to disgorge administrative fees and foregone margin charges that NIPSCO collected pursuant to its own IURC-approved tariff. NIPSCO currently estimates the maximum amount of its disgorgement exposure to be $9.7 million, and the investigation is still ongoing. NIPSCO intends to seek indemnification under its agreements with the customer for any liability NIPSCO incurs related to this matter. Other Claims and Proceedings. We are also party to certain other claims, regulatory and legal proceedings arising in the ordinary course of business in each state in which we have operations, none of which we believe to be individually material at this time. Due to the inherent uncertainty of litigation, there can be no assurance that the resolution of any particular claim, proceeding or investigation would not have a material adverse effect on our results of operations, financial position or liquidity. If one or more other matters were decided against us, the effects could be material to our results of operations in the period in which we would be required to record or adjust the related liability and could also be material to our cash flows in the periods that we would be required to pay such liability. D. Other Greater Lawrence Incident Matters . In connection with the Greater Lawrence Incident, Columbia of Massachusetts, in cooperation with the Massachusetts Governor’s office, replaced the entire affected pipeline system. We invested approximately $258 million of capital spend for the pipeline replacement; this work was completed in 2019. We maintain property insurance for gas pipelines and other applicable property. Columbia of Massachusetts filed a proof of loss with its property insurer for the pipeline replacement. In January 2020, we filed a lawsuit against the property insurer, seeking payment of our property claim. On October 27, 2021, NiSource and the property insurer filed cross motions for summary judgment, each asking the court to determine whether there was coverage under the policy. After the cross motions for summary judgment were fully briefed, we reached an agreement to settle the coverage dispute for $105.0 million. After settlement payment was made, NiSource and its property insurer stipulated to the dismissal of the lawsuit on March 16, 2022. E. Environmental Matters . Our operations are subject to environmental statutes and regulations related to air quality, water quality, hazardous waste and solid waste. We believe that we are in substantial compliance with the environmental regulations currently applicable to our operations. It is management's continued intent to address environmental issues in cooperation with regulatory authorities in such a manner as to achieve mutually acceptable compliance plans. However, there can be no assurance that fines and penalties will not be incurred. Management expects the majority of environmental assessment and remediation costs and asset retirement costs, further described below, to be recoverable through rates. See Note 9, "Regulatory Matters," for additional detail. As of December 31, 2022 and 2021, we had recorded a liability of $86.5 million and $91.1 million, respectively, to cover environmental remediation at various sites. This liability is included in "Other accruals" and "Other noncurrent liabilities" in the Consolidated Balance Sheets. We recognize costs associated with environmental remediation obligations when the incurrence of such costs is probable and the amounts can be reasonably estimated. The original estimates for remediation activities may differ materially from the amount ultimately expended. The actual future expenditures depend on many factors, including laws and regulations, the nature and extent of impact and the method of remediation. These expenditures are not currently estimable at some sites. We periodically adjust our liability as information is collected and estimates become more refined. See Note 8, "Asset Retirement Obligations," for a discussion of all obligations, including those discussed below. CERCLA. Our subsidiaries are potentially responsible parties at waste disposal sites under the CERCLA and similar state laws. Under CERCLA, each potentially responsible party can be held jointly, severally and strictly liable for the remediation costs as the EPA, or state, can allow the parties to pay for remedial action or perform remedial action themselves and request reimbursement from the potentially responsible parties. Our affiliates have retained CERCLA environmental liabilities, including remediation liabilities, associated with certain current and former operations. At this time, NIPSCO cannot estimate the full cost of remediating properties that have not yet been investigated, but it is possible that the future costs could be material to the Consolidated Financial Statements. MGP. We maintain a program to identify and investigate former MGP sites where Gas Distribution Operations subsidiaries or predecessors may have liability. The program has identified 53 such sites where liability is probable. Remedial actions at many of these sites are being overseen by state or federal environmental agencies through consent agreements or voluntary remediation agreements. We utilize a probabilistic model to estimate our future remediation costs related to MGP sites. The model was prepared with the assistance of a third party and incorporates our experience and general industry experience with remediating MGP sites. We complete an annual refresh of the model in the second quarter of each fiscal year. No material changes to the estimated future remediation costs were noted as a result of the refresh completed as of June 30, 2022. Our total estimated liability related to the facilities subject to remediation was $81.0 million and $85.1 million at December 31, 2022 and 2021, respectively. The liability represents our best estimate of the probable cost to remediate the MGP sites. We believe that it is reasonably possible that remediation costs could vary by as much as $17 million in addition to the costs noted above. Remediation costs are estimated based on the best available information, applicable remediation standards at the balance sheet date, and experience with similar facilities. CCRs. We continue to meet the compliance requirements established in the EPA's final rule for the regulation of CCRs. The CCR rule also resulted in revisions to previously recorded legal obligations associated with the retirement of certain NIPSCO facilities. The actual asset retirement costs related to the CCR rule may vary substantially from the estimates used to record the increased asset retirement obligation due to the uncertainty about the requirements that will be established by environmental authorities, compliance strategies that will be used and the preliminary nature of available data used to estimate costs. As allowed by the rule, NIPSCO will continue to collect data over time to determine the specific compliance solutions and associated costs and, as a result, the actual costs may vary. F. Other Matters Generation Transition. NIPSCO has executed several PPAs to purchase 100% of the output from renewable generation facilities at a fixed price per MWh. Each facility supplying the energy will have an associated nameplate capacity, and payments under the PPAs will not begin until the associated generation facility is constructed by the owner/seller. NIPSCO has also executed several BTAs with developers to construct renewable generation facilities. NIPSCO's purchase obligation under each respective BTA is dependent on satisfactory approval of the BTA by the IURC, successful execution by NIPSCO of an agreement with a tax equity partner and timely completion of construction. NIPSCO has received IURC approval for all of its BTAs and PPAs. NIPSCO and the tax equity partner, for each respective BTA, are obligated to make cash contributions to the JV that acquires the project at the date construction is substantially complete. Certain agreements require NIPSCO to make partial payments upon the developer's completion of significant construction milestones. Once the tax equity partner has earned its negotiated rate of return and we have reached the agreed upon contractual date, NIPSCO has the option to purchase at fair market value the remaining interest in the JV from the tax equity partner. Employee Separation Benefits. In the third quarter of 2020, we launched a program to evaluate our organizational structure under the auspices of NiSource Next, which continued into 2021. We recognized the majority of the related severance expense in 2020 when the employees accepted severance offers, absent a retention period. For employees that have a retention period, expense will be recognized over the remaining service period. The total severance expense for employees was approximately $38 million, with substantially all of it incurred and paid to date.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2022
Components of Accumulated Other Comprehensive Income (Loss) [Abstract]
Accumulated Other Comprehensive Loss	The following table displays the activity of Accumulated Other Comprehensive Loss, net of tax: (in millions) Gains and Losses on Securities (1) Gains and Losses on Cash Flow Hedges (1) Pension and OPEB Items (1) Accumulated Other Comprehensive Loss (1) Balance as of January 1, 2020 $ 3.3 $ (77.2) $ (18.7) $ (92.6) Other comprehensive income (loss) before reclassifications 3.3 (70.8) 2.9 (64.6) Amounts reclassified from accumulated other comprehensive loss (0.6) 0.1 1.0 0.5 Net current-period other comprehensive income (loss) 2.7 (70.7) 3.9 (64.1) Balance as of December 31, 2020 $ 6.0 $ (147.9) $ (14.8) $ (156.7) Other comprehensive income (loss) before reclassifications (3.5) 25.3 6.6 28.4 Amounts reclassified from accumulated other comprehensive loss (0.4) 0.1 1.8 1.5 Net current-period other comprehensive income (loss) (3.9) 25.4 8.4 29.9 Balance as of December 31, 2021 $ 2.1 $ (122.5) $ (6.4) $ (126.8) Other comprehensive income (loss) before reclassifications (13.7) 109.7 (8.9) 87.1 Amounts reclassified from accumulated other comprehensive loss 0.4 0.2 2.0 2.6 Net current-period other comprehensive income (loss) (13.3) 109.9 (6.9) 89.7 Balance as of December 31, 2022 $ (11.2) $ (12.6) $ (13.3) $ (37.1) (1) All amounts are net of tax. Amounts in parentheses indicate debits.

Segments Of Business

Segments Of Business	12 Months Ended
	Dec. 31, 2022
Segment Reporting [Abstract]
Segments Of Business	At December 31, 2022, our operations are divided into two primary reportable segments, the Gas Distribution Operations and the Electric Operations segments. The remainder of our operations, which are not significant enough on a stand-alone basis to warrant treatment as an operating segment, are presented as "Corporate and Other" and primarily are comprised of interest expense on holding company debt and unallocated corporate costs and activities. Refer to Note 3, "Revenue Recognition," for additional information on our segments and their sources of revenues. The following table provides information about our reportable segments. We use operating income as our primary measurement for each of the reported segments and make decisions on finance, dividends and taxes at the corporate level on a consolidated basis. Segment revenues include intersegment sales to affiliated subsidiaries, which are eliminated in consolidation. Affiliated sales are recognized on the basis of prevailing market, regulated prices or at levels provided for under contractual agreements. Operating income is derived from revenues and expenses directly associated with each segment. Year Ended December 31, (in millions) 2022 2021 2020 Operating Revenues Gas Distribution Operations Unaffiliated $ 4,007.2 $ 3,171.2 $ 3,128.1 Intersegment 12.6 12.3 12.1 Total 4,019.8 3,183.5 3,140.2 Electric Operations Unaffiliated 1,830.9 1,696.3 1,535.9 Intersegment 0.8 0.8 0.7 Total 1,831.7 1,697.1 1,536.6 Corporate and Other Unaffiliated 12.5 32.1 17.7 Intersegment 465.0 460.3 449.8 Total 477.5 492.4 467.5 Eliminations (478.4) (473.4) (462.6) Consolidated Operating Revenues $ 5,850.6 $ 4,899.6 $ 4,681.7 Year Ended December 31, (in millions) 2022 2021 2020 Operating Income (Loss) Gas Distribution Operations (1) $ 915.8 $ 617.5 $ 199.1 Electric Operations 362.4 387.8 348.8 Corporate and Other (12.4) 1.6 2.9 Consolidated Operating Income $ 1,265.8 $ 1,006.9 $ 550.8 Depreciation and Amortization Gas Distribution Operations $ 415.9 $ 383.0 $ 363.1 Electric Operations 362.9 329.4 321.3 Corporate and Other 42.0 36.0 41.5 Consolidated Depreciation and Amortization $ 820.8 $ 748.4 $ 725.9 Assets Gas Distribution Operations $ 16,986.5 $ 15,153.7 $ 13,433.0 Electric Operations 7,992.6 7,178.9 6,443.1 Corporate and Other 1,757.5 1,824.3 2,164.4 Consolidated Assets $ 26,736.6 $ 24,156.9 $ 22,040.5 Capital Expenditures (2) Gas Distribution Operations $ 1,682.3 $ 1,406.4 $ 1,266.9 Electric Operations 574.5 517.4 422.8 Corporate and Other 41.2 16.6 31.1 Consolidated Capital Expenditures $ 2,298.0 $ 1,940.4 $ 1,720.8 (1) In 2020, Gas Distribution Operations reflects the loss of $412.4 million on the sale of the Massachusetts Business. (2) Amounts differ from those presented on the Statements of Consolidated Cash Flows primarily due to the inclusion of capital expenditures in current liabilities, the capitalized portion of the Corporate Incentive Plan payout, and AFUDC Equity.

Other, Net

Other, Net	12 Months Ended
	Dec. 31, 2022
Other Nonoperating Income (Expense) [Abstract]
Other, Net	Year Ended December 31, (in millions) 2022 2021 2020 Interest income $ 4.3 $ 4.0 $ 5.5 AFUDC equity 15.1 13.1 9.9 Charitable contributions (4.4) (11.5) (1.5) Pension and other postretirement non-service cost (1) 27.6 35.5 9.3 Sale of emission reduction credits — — 4.6 Interest rate swap settlement gain (2) 10.0 — — Miscellaneous (0.4) (0.3) 4.3 Total Other, net $ 52.2 $ 40.8 $ 32.1 (1) See Note 12, "Pension and Other Postemployment Benefits," for additional information.

Interest Expense, Net

Interest Expense, Net	12 Months Ended
	Dec. 31, 2022
Interest Expense [Abstract]
Interest Expense, Net	The following table displays the components of Interest Expense, Net included on the Statements of Consolidated Income (Loss): Year Ended December 31, (in millions) 2022 2021 2020 Interest on long-term debt $ 344.5 $ 336.4 $ 354.2 Interest on short-term borrowings 22.7 0.6 14.7 Debt discount/cost amortization 11.7 11.0 9.1 Accounts receivable securitization fees 2.5 1.4 2.6 Allowance for borrowed funds used and interest capitalized during construction (6.7) (4.6) (7.0) Debt-based post-in-service carrying charges (21.1) (14.7) (14.6) Other 8.0 11.0 11.7 Total Interest Expense, net $ 361.6 $ 341.1 $ 370.7

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	12 Months Ended
	Dec. 31, 2022
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Information	The following table provides additional information regarding our Consolidated Statements of Cash Flows for the years ended December 31, 2022, 2021 and 2020: Year Ended December 31, (in millions) 2022 2021 2020 Supplemental Disclosures of Cash Flow Information Non-cash transactions: Capital expenditures included in current liabilities $ 275.1 $ 245.7 $ 170.4 Assets acquired under a finance lease 19.3 22.4 59.3 Assets acquired under an operating lease 8.8 6.0 10.9 Reclassification of other property to regulatory assets (1) — 607.6 — Assets recorded for asset retirement obligations (2) 6.3 12.0 91.5 Obligation to developer at formation of JV (3) — 277.5 69.7 Purchase contract liability, net of fees and payments (4) 65.0 129.4 — Schedule of interest and income taxes paid: Cash paid for interest on long-term debt, net of interest capitalized amounts $ 343.8 $ 322.4 $ 349.0 Cash paid for interest on finance leases 8.5 9.4 11.1 Cash paid for income taxes, net of refunds (5) 7.2 5.4 (1.0) (1) See Note 9, "Regulatory Matters," for additional information. (2) See Note 8, "Asset Retirement Obligations," for additional information. (3) Represents investing non-cash activity. See Note 4, "Variable Interest Entities," for additional information. (4) Refer to Note 13, "Equity," for additional information. (5) Amount of refunds in 2020 was greater than the amount of tax payments due to overpayments in 2019.

Nature of Operations And Summ_2

Nature of Operations And Summary of Significant Accounting Policies (Policy)	12 Months Ended
	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Company Structure And Principles Of Consolidation	Company Structure and Principles of Consolidation. We are an energy holding company incorporated in Delaware and headquartered in Merrillville, Indiana. Our subsidiaries are fully regulated natural gas and electric utility companies serving approximately 3.7 million customers in six states. We generate substantially all of our operating income through these rate-regulated businesses. The consolidated financial statements include the accounts of us, our majority-owned subsidiaries, and VIEs of which we are the primary beneficiary after the elimination of all intercompany accounts and transactions.
Use Of Estimates	Use of Estimates. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Cash, Cash Equivalents, And Restricted Cash	Cash, Cash Equivalents and Restricted Cash. We consider all highly liquid investments with original maturities of three months or less to be cash equivalents. We report amounts deposited in brokerage accounts for margin requirements as restricted cash. In addition, we have amounts deposited in trusts to satisfy requirements for the provision of various property, liability, workers compensation, and long-term disability insurance, which is classified as restricted cash on the Consolidated Balance Sheets and disclosed with cash and cash equivalents on the Statements of Consolidated Cash Flows.
Accounts Receivable And Unbilled Revenue	Accounts Receivable and Unbilled Revenue. Accounts receivable on the Consolidated Balance Sheets includes both billed and unbilled amounts. Unbilled amounts of accounts receivable relate to a portion of a customer’s consumption of gas or electricity from the last cycle billing date through the last day of the month (balance sheet date). Factors taken into consideration when estimating unbilled revenue include historical usage, customer rates, weather and reasonable and supportable forecasts. Accounts receivable fluctuates from year to year depending in large part on weather impacts and price volatility. Our accounts receivable on the Consolidated Balance Sheets include unbilled revenue, less reserves. The reserve for uncollectible receivables is our best estimate of the amount of probable credit losses in the existing accounts receivable. We determined the reserve based on historical collection experience, current market conditions and reasonable and supportable forecasts. Account balances are charged against the allowance when it is anticipated the receivable will not be recovered. Refer to Note 3, "Revenue Recognition," for additional information on customer-related accounts receivable, including amounts related to unbilled revenues.
Investments In Debt And Equity Securities	Investments in Debt Securities. Our investments in debt securities are carried at fair value and are designated as available-for-sale. These investments are included within “Available-for-sale debt securities” on the Consolidated Balance Sheets. Unrealized gains and losses, net of deferred income taxes, are recorded to accumulated other comprehensive income or loss. At each reporting period these investments are qualitatively and quantitatively assessed to determine whether a decline in fair value below the amortized cost basis has resulted from a credit loss or other factors. Impairments related to credit loss are recorded through an allowance for credit losses. Impairments that are not related to credit losses are included in other comprehensive income and are reflected in the Statements of Consolidated Income (Loss). No material impairment charges were recorded for the years ended December 31, 2022, 2021 or 2020. Refer to Note 18, "Fair Value," for additional information.
Basis Of Accounting For Rate-Regulated Subsidiaries	Basis of Accounting for Rate-Regulated Subsidiaries. Rate-regulated subsidiaries account for and report assets and liabilities consistent with the economic effect of the way in which regulators establish rates, if the rates established are designed to recover the costs of providing the regulated service and it is probable that such rates can be charged and collected. Certain expenses and credits subject to utility regulation or rate determination normally reflected in income are deferred on the Consolidated Balance Sheets and are later recognized in income as the related amounts are included in customer rates and recovered from or refunded to customers.We continually evaluate whether or not our operations are within the scope of ASC 980 and rate regulations. As part of that analysis, we evaluate probability of recovery for our regulatory assets. In management’s opinion, our regulated subsidiaries will be subject to regulatory accounting for the foreseeable future. Refer to Note 9, "Regulatory Matters," for additional information.
Utility Plant And Other Property And Related Depreciation And Maintenance	Plant and Other Property and Related Depreciation and Maintenance. Property, plant and equipment (principally utility plant) is stated at cost. Our rate-regulated subsidiaries record depreciation using composite rates on a straight-line basis over the remaining service lives of the electric, gas and common properties, as approved by the appropriate regulators. Non-utility property includes renewable generation assets owned by JVs of which we are the primary beneficiary and is generally depreciated on a straight-line basis over the life of the associated assets. Refer to Note 6, "Property, Plant and Equipment," for additional information related to depreciation expense. For rate-regulated companies where provided for in rates, AFUDC is capitalized on all classes of property except organization costs, land, autos, office equipment, tools and other general property purchases. The allowance is applied to construction costs for that period of time between the date of the expenditure and the date on which such project is placed in service. Our consolidated pre-tax rate for AFUDC was 3.4% in 2022, 3.3% in 2021 and 2.6% in 2020. Generally, our subsidiaries follow the practice of charging maintenance and repairs, including the cost of removal of minor items of property, to expense as incurred. When our subsidiaries retire regulated property, plant and equipment, original cost plus the cost of retirement, less salvage value, is charged to accumulated depreciation. However, when it becomes probable a regulated asset will be retired substantially in advance of its original expected useful life or is abandoned, the cost of the asset and the corresponding accumulated depreciation is recognized as a separate asset. If the asset is still in operation, the gross amounts are classified as "Non-Utility and Other " as described in Note 6, "Property, Plant and Equipment." If the asset is no longer operating but still subject to recovery, the net amount is classified in "Regulatory assets" on the Consolidated Balance Sheets. If we are able to recover a full return of and on investment, the carrying value of the asset is based on historical cost. If we are not able to recover a full return on investment, a loss on impairment is recognized to the extent the net book value of the asset exceeds the present value of future revenues discounted at the incremental borrowing rate.
Goodwill And Other Intangible Assets	Goodwill and Other Intangible Assets. Substantially all of our goodwill relates to the excess of cost over the fair value of the net assets acquired in the Columbia acquisition on November 1, 2000. We test our goodwill for impairment annually as of May 1, or more frequently if events and circumstances indicate that goodwill might be impaired. Fair value of our reporting units is determined using a combination of income and market approaches. See Note 7, "Goodwill," for additional information.
Accounts Receivable Transfer Program	Accounts Receivable Transfer Programs. Certain of our subsidiaries have agreements with third parties to transfer certain accounts receivable without recourse. These transfers of accounts receivable are accounted for as secured borrowings. The entire gross receivables balance remains on the December 31, 2022 and 2021 Consolidated Balance Sheets. When amounts are securitized, the short-term debt is recorded in the amount of proceeds received from the transferees involved in the transactions. Refer to Note 16, "Short-Term Borrowings," for further information.
Fuel Adjustment Clause	Gas Cost and Fuel Adjustment Clause. Our regulated subsidiaries defer most differences between gas and fuel purchase costs and the recovery of such costs in revenues and adjust future billings for such deferrals on a basis consistent with applicable state-approved tariff provisions. These deferred balances are recorded as "Regulatory assets" or "Regulatory liabilities," as appropriate, on the Consolidated Balance Sheets. Refer to Note 9, "Regulatory Matters," for additional information.
Gas Inventory	Inventory. Both the LIFO inventory methodology and the weighted average cost methodology are used to value natural gas in storage, as approved by regulators for all of our regulated subsidiaries. Inventory valued using LIFO was $43.0 million and $44.9 million at December 31, 2022 and 2021, respectively. Based on the average cost of gas using the LIFO method, the estimated replacement cost of gas in storage was greater than the stated LIFO cost by $7.7 million at December 31, 2022 and was less than the stated LIFO cost by $13.6 million at December 31, 2021. As all LIFO inventory costs are collected from customers through our rate-regulated subsidiaries, no inventory impairment has been recorded. Gas inventory valued using the weighted average cost methodology was $488.7 million at December 31, 2022 and $282.4 million at December 31, 2021.
Accounting For Exchange And Balancing Arrangements Of Natural Gas	Accounting for Exchange and Balancing Arrangements of Natural Gas. Our Gas Distribution Operations segment enters into balancing and exchange arrangements of natural gas as part of its operations and off-system sales programs. We record a receivable or payable for any of our respective cumulative gas imbalances, as well as for any gas inventory borrowed or lent under a Gas Distribution Operations exchange agreement. Exchange gas is valued based on individual regulatory jurisdiction requirements (for example, historical spot rate, spot at the beginning of the month). These receivables and payables are recorded as “Exchange gas receivable” or “Exchange gas payable” on our Consolidated Balance Sheets, as appropriate.
Accounting For Risk Management Activities	Accounting for Risk Management Activities. We account for our derivatives and hedging activities in accordance with ASC 815. We recognize all derivatives as either assets or liabilities on the Consolidated Balance Sheets at fair value, unless such contracts are exempted as a normal purchase normal sale under the provisions of the standard. The accounting for changes in the fair value of a derivative depends on the intended use of the derivative and resulting designation. We do not offset the fair value amounts recognized for any of our derivative instruments against the fair value amounts recognized for the right to reclaim cash collateral or obligation to return cash collateral for derivative instruments executed with the same counterparty under a master netting arrangement. See Note 10, "Risk Management Activities," for additional information.
Income Taxes And Investment Tax Credits	Income Taxes and Investment Tax Credits. We record income taxes to recognize full interperiod tax allocations. Under the asset and liability method, deferred income taxes are provided for the tax consequences of temporary differences by applying enacted statutory tax rates applicable to future years to differences between the financial statement carrying amount and the tax basis of existing assets and liabilities. Investment tax credits associated with regulated operations are deferred and amortized as a reduction to income tax expense over the estimated useful lives of the related properties.
Environmental Expenditures	Environmental Expenditures. We accrue for costs associated with environmental remediation obligations, including expenditures related to asset retirement obligations and cost of removal, when the incurrence of such costs is probable and the amounts can be reasonably estimated, regardless of when the expenditures are actually made. The undiscounted estimated future expenditures are based on currently enacted laws and regulations, existing technology and estimated site-specific costs where assumptions may be made about the nature and extent of site contamination, the extent of cleanup efforts, costs of alternative cleanup methods and other variables. The liability is adjusted as further information is discovered or circumstances change. The accruals for estimated environmental expenditures are recorded on the Consolidated Balance Sheets in “Other accruals” for short-term portions of these liabilities and “Other noncurrent liabilities” for the respective long-term portions of these liabilities. Rate-regulated subsidiaries applying regulatory accounting establish regulatory assets on the Consolidated Balance Sheets to the extent that future recovery of environmental remediation costs is probable through the regulatory process. Refer to Note 8, "Asset Retirement Obligations," and Note 19, "Other Commitments and Contingencies," for further information.
Excise Taxes	Excise Taxes. As an agent for some state and local governments, we invoice and collect certain excise taxes levied by state and local governments on customers and record these amounts as liabilities payable to the applicable taxing jurisdiction. Such balances are presented within "Other accruals" on the Consolidated Balance Sheets. These types of taxes collected from customers, comprised largely of sales taxes, are presented on a net basis affecting neither revenues nor cost of sales. We account for excise taxes for which we are liable by recording a liability for the expected tax with a corresponding charge to “Other taxes” expense on the Statements of Consolidated Income (Loss).
Accrued Insurance Liabilities	Accrued Insurance Liabilities. We accrue for insurance costs related to workers compensation, automobile, property, general and employment practices liabilities based on the most probable value of each claim. In general, claim values are determined by professional, licensed loss adjusters who consider the facts of the claim, anticipated indemnification and legal expenses, and respective state rules. Claims are reviewed by us at least quarterly and an adjustment is made to the accrual based on the most current information.
Pension Remeasurement	Pension Remeasurement. We utilize a third-party actuary for the purpose of performing actuarial valuations of our defined benefit plans. Annually, as of December 31, we perform a remeasurement for our pension plans. Quarterly, we monitor for significant events, and if a significant event is identified, we perform a qualitative and quantitative assessment to determine if the resulting remeasurement would materially impact the NiSource financial statements. If material, an interim remeasurement is performed. We had one such interim remeasurement in the second quarter of 2022. See Note 12, "Pension and Other Postemployment Benefits," for additional information.
VIEs and Allocation of Earnings	VIEs and Allocation of Earnings. We fund a significant portion of our renewable generation assets through JVs with tax equity partners. We consolidate these JVs in accordance with ASC 810 as they are VIEs in which we hold a variable interest, and we control decisions that are significant to the JVs' ongoing operations and economic results (i.e., we are the primary beneficiary). These JVs are subject to profit sharing arrangements in which the allocation of the JVs' cash distributions and tax benefits to members is based on factors other than members' relative ownership percentages. As such, we utilize the HLBV method to allocate proceeds to each partner at the balance sheet date based on the liquidation provisions of the related JV's operating agreement and adjusts the amount of the VIE's net income attributable to us and the noncontrolling tax equity member during the period. In each reporting period, the application of HLBV to our consolidated VIEs results in a difference between the amount of profit from the consolidated JVs and the amount included in regulated rates. As discussed above in "F. Basis of Accounting for Rate-Regulated Subsidiaries," we are subject to the accounting and reporting requirements of ASC 980. In accordance with these principles, we recognize a regulatory liability or asset for amounts representing the timing difference between the profit earned from the JVs and the amount included in regulated rates to recover our approved investments in consolidated JVs. The amounts recorded in income will ultimately reflect the amount allowed in regulated rates to recover our investments over the useful life of the projects. The offset to the regulatory liability or asset associated with our renewable investments included in regulated rates is recorded in "Depreciation expense" on the Statements of Consolidated Income (Loss).

Revenue Recognition (Tables)

Revenue Recognition (Tables)	12 Months Ended
	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The tables below reconcile revenue disaggregation by customer class to segment revenue, as well as to revenues reflected on the Statements of Consolidated Income (Loss): Year Ended December 31, 2022 (in millions) Gas Distribution Operations Electric Operations Corporate and Other (2) Total Customer Revenues (1) Residential $ 2,609.7 $ 592.4 $ — $ 3,202.1 Commercial 939.6 571.0 — 1,510.6 Industrial 220.6 560.6 — 781.2 Off-system 192.9 — — 192.9 Miscellaneous 40.3 11.5 — 51.8 Total Customer Revenues $ 4,003.1 $ 1,735.5 $ — $ 5,738.6 Other Revenues 4.1 95.4 12.5 112.0 Total Operating Revenues $ 4,007.2 $ 1,830.9 $ 12.5 $ 5,850.6 (1) Customer revenue amounts exclude intersegment revenues. See Note 21, "Business Segment Information," for discussion of intersegment revenues. (2) Other revenues related to the Transition Services Agreement entered into in connection with the sale of the Massachusetts Business, which was substantially completed as of June 30, 2022. Year Ended December 31, 2021 (in millions) Gas Distribution Operations Electric Operations Corporate and Other (2) Total Customer Revenues (1) Residential $ 2,109.4 $ 567.9 $ — $ 2,677.3 Commercial 722.4 534.9 — 1,257.3 Industrial 195.7 493.4 — 689.1 Off-system 71.3 — — 71.3 Miscellaneous 27.3 8.2 0.8 36.3 Total Customer Revenues $ 3,126.1 $ 1,604.4 $ 0.8 $ 4,731.3 Other Revenues 45.1 91.9 31.3 168.3 Total Operating Revenues $ 3,171.2 $ 1,696.3 $ 32.1 $ 4,899.6 (1) Customer revenue amounts exclude intersegment revenues. See Note 21, "Business Segment Information," for discussion of intersegment revenues. (2) Other revenues related to the Transition Services Agreement entered into in connection with the sale of the Massachusetts Business. Year Ended December 31, 2020 (in millions) Gas Distribution Operations Electric Operations Corporate and Other (2) Total Customer Revenues (1) Residential $ 2,075.0 $ 527.8 $ — $ 2,602.8 Commercial 670.5 480.3 — 1,150.8 Industrial 212.8 412.1 — 624.9 Off-system 41.0 — — 41.0 Miscellaneous 32.7 20.2 0.8 53.7 Total Customer Revenues $ 3,032.0 $ 1,440.4 $ 0.8 $ 4,473.2 Other Revenues 96.1 95.5 16.9 208.5 Total Operating Revenues $ 3,128.1 $ 1,535.9 $ 17.7 $ 4,681.7 (1) Customer revenue amounts exclude intersegment revenues. See Note 21, "Business Segment Information," for discussion of intersegment revenues. (2) Other revenues related to the Transition Services Agreement entered into in connection with the sale of the Massachusetts Business.
Customer Accounts Receivable	The opening and closing balances of customer receivables for the year ended December 31, 2022, are presented in the table below. We had no significant contract assets or liabilities during the period. Additionally, we have not incurred any significant costs to obtain or fulfill contracts. (in millions) Customer Accounts Receivable, Billed (less reserve) Customer Accounts Receivable, Unbilled (less reserve) Balance as of December 31, 2021 $ 459.6 $ 337.0 Balance as of December 31, 2022 560.5 453.0
Financing Receivable, Allowance for Credit Loss	A rollforward of our allowance for credit losses as of December 31, 2022 and December 31, 2021, are presented in the tables below: (in millions) Gas Distribution Operations Electric Operations Corporate and Other Total Balance as of January 1, 2022 $ 18.9 $ 3.8 $ 0.8 $ 23.5 Current period provisions 29.1 6.9 — 36.0 Write-offs charged against allowance (52.1) (5.3) — (57.4) Recoveries of amounts previously written off 21.3 0.5 — 21.8 Balance as of December 31, 2022 $ 17.2 $ 5.9 $ 0.8 $ 23.9 (in millions) Gas Distribution Operations Electric Operations Corporate and Other Total Balance as of January 1, 2021 $ 41.8 $ 9.7 $ 0.8 $ 52.3 Current period provisions 5.8 1.4 — 7.2 Write-offs charged against allowance (46.7) (7.7) — (54.4) Recoveries of amounts previously written off 18.0 0.4 — 18.4 Balance as of December 31, 2021 $ 18.9 $ 3.8 $ 0.8 $ 23.5

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	12 Months Ended
	Dec. 31, 2022
Variable Interest Entities [Abstract]
Variable Interest Entities Assets and Liabilities	Our Consolidated Balance Sheets included the following assets and liabilities associated with VIEs. (in millions) December 31, December 31, Net Property, Plant and Equipment $ 978.5 $ 695.9 Current assets 25.7 14.3 Total assets (1) 1,004.2 710.2 Current liabilities 128.2 10.0 Asset retirement obligations 30.6 20.5 Total liabilities $ 158.8 $ 30.5 (1) The assets of each VIE represent assets of a consolidated VIE that can be used only to settle obligations of the respective consolidated VIE. The creditors of the liabilities of the VIEss do not have recourse to the general credit of the primary beneficiary.
Noncontrolling Interest Cash Contributions	The following table displays the total contributions paid and obligations incurred in the periods presented: (in millions) December 31, 2022 December 31, 2021 December 31, 2020 NIPSCO Cash Contributions $ 151.8 $ 2.8 $ 0.7 Tax Equity Partner Cash Contributions 21.2 245.1 86.1 NIPSCO's Obligation to Developer (1) — 277.5 69.7 Total Contributions $ 173.0 $ 525.4 $ 156.5 (1) Outstanding amounts in "Obligations to renewable generation asset developer" in the Consolidated Balance Sheets.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2022
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table presents the calculation of our basic and diluted EPS: Year Ended December 31, (in millions, except per share amounts) 2022 2021 2020 Numerator: Net Income (Loss) Available to Common Shareholders - Basic $ 749.0 $ 529.8 $ (72.7) Dilutive effect of Equity Units 2.0 1.6 — Net Income (Loss) Available to Common Shareholders - Diluted $ 751.0 $ 531.4 $ (72.7) Denominator: Average common shares outstanding - Basic 407.1 393.6 384.3 Dilutive potential common shares: Equity Units purchase contracts 30.2 22.0 — Equity Units purchase contract payment balance 3.2 — — Shares contingently issuable under employee stock plans 0.9 0.8 — Shares restricted under employee stock plans 0.5 0.3 — ATM Forward agreements 0.8 0.6 — Average Common Shares - Diluted 442.7 417.3 384.3 Earnings per common share: Basic $ 1.84 $ 1.35 $ (0.19) Diluted $ 1.70 $ 1.27 $ (0.19)

Property, Plant And Equipment (

Property, Plant And Equipment (Tables)	12 Months Ended
	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Schedule Of Property, Plant And Equipment	Our property, plant and equipment on the Consolidated Balance Sheets are classified as follows: At December 31, (in millions) 2022 2021 Property, Plant and Equipment Gas Distribution Utility (1) $ 16,576.4 $ 15,240.6 Electric Utility (1) 7,162.4 6,754.9 Corporate 271.7 217.8 Construction Work in Process 1,398.2 808.0 Renewable Generation Assets (2) 702.2 702.4 Non-Utility and Other 1,440.4 1,447.6 Total Property, Plant and Equipment $ 27,551.3 $ 25,171.3 Accumulated Depreciation and Amortization Gas Distribution Utility (1) $ (3,678.1) $ (3,490.2) Electric Utility (1) (2,557.4) (2,433.1) Corporate (160.0) (132.2) Renewable Generation Assets (2) (29.7) (6.5) Non-Utility and Other (1,283.5) (1,227.5) Total Accumulated Depreciation and Amortization $ (7,708.7) $ (7,289.5) Net Property, Plant and Equipment $ 19,842.6 $ 17,881.8 (1) NIPSCO’s common utility plant and associated accumulated depreciation and amortization are allocated between Gas Distribution Utility and Electric Utility Property, Plant and Equipment. (2) Our renewable generation assets are part of our electric segment and represent Non-Utility Property, owned and operated by JVs between NIPSCO and unrelated tax equity partners, and depreciated straight-line over 30 years. Refer to Note 4, "Variable Interest Entities," for additional information.
Schedule Of Depreciation Provisions For Utility Plant As A Percentage Of The Original Cost	The weighted average depreciation provisions for utility plant, as a percentage of the original cost, for the periods ended December 31, 2022, 2021 and 2020 were as follows: 2022 2021 2020 Electric Operations 3.1 % 3.4 % 3.4 % Gas Distribution Operations 2.3 % 2.2 % 2.3 %

Asset Retirement Obligations (T

Asset Retirement Obligations (Tables)	12 Months Ended
	Dec. 31, 2022
Asset Retirement Obligation [Abstract]
Changes In Liability For Asset Retirement Obligations	Changes in our liability for asset retirement obligations for the years 2022 and 2021 are presented in the table below: (in millions) 2022 2021 Beginning Balance $ 512.4 $ 495.6 Accretion recorded as a regulatory asset/liability 17.1 16.0 Additions 9.5 23.2 Settlements (22.3) (11.2) Change in estimated cash flows (3.2) (11.2) Ending Balance $ 513.5 $ 512.4

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2022
Regulatory Assets and Liabilities Disclosure [Abstract]
Regulatory Assets	Regulatory assets were comprised of the following items: At December 31, (in millions) 2022 2021 Regulatory Assets Unrecognized pension and other postretirement benefit costs (see Note 12) $ 607.5 $ 512.1 Deferred pension and other postretirement benefit costs (see Note 12) 72.2 74.8 Environmental costs (see Note 19-E.) 41.4 45.8 Regulatory effects of accounting for income taxes (see Note 1-N. and Note 11) 158.0 194.8 Under-recovered gas and fuel costs (see Note 1-J.) 85.5 73.6 Depreciation 191.3 177.5 Post-in-service carrying charges 251.5 237.9 Safety activity costs 200.7 171.9 DSM programs 37.5 39.2 Retired coal generating stations 744.0 803.9 Losses on commodity price risk programs (See Note 10) 10.0 9.6 Deferred property taxes 68.5 65.1 Renewable energy investments (See Note 1-S. and Note 4) 37.7 18.5 Other 75.0 67.5 Total Regulatory Assets $ 2,580.8 $ 2,492.2 Less: Current Portion 233.2 206.2 Total Noncurrent Regulatory Assets $ 2,347.6 $ 2,286.0
Regulatory Liabilities	Regulatory liabilities were comprised of the following items: At December 31, (in millions) 2022 2021 Regulatory Liabilities Over-recovered gas and fuel costs (see Note 1-J.) $ 20.6 $ 5.4 Cost of removal (see Note 8) 675.9 749.5 Regulatory effects of accounting for income taxes (see Note 1-N. and Note 11) 996.3 1,040.8 Deferred pension and other postretirement benefit costs (see Note 12) 66.8 75.9 Gains on commodity price risk programs (See Note 10) 90.0 34.2 Customer Assistance Programs 32.9 13.2 Rate Refunds 51.4 8.2 Other 78.7 52.8 Total Regulatory Liabilities $ 2,012.6 $ 1,980.0 Less: Current Portion 236.8 137.4 Total Noncurrent Regulatory Liabilities $ 1,775.8 $ 1,842.6
Schedule of COVID-19 Regulatory Impact	The ongoing impacts of these approvals or directives are described in the table below: Jurisdiction Regulatory Asset balance as of December 31, 2022 (in millions) Regulatory Asset balance as of December 31, 2021 (in millions) Deferred COVID-19 Costs Columbia of Ohio $ — $ 2.1 Incremental operation and maintenance expenses NIPSCO $ 2.1 $ 2.2 Incremental bad debt expense and the costs to implement the requirements of the COVID-19 related order Columbia of Pennsylvania $ 2.8 $ 5.2 Incremental bad debt expense incurred from March 13, 2020 through December 29, 2021, above levels currently in rates Columbia of Virginia $ 1.9 $ 1.5 Incremental incurred costs, including incremental bad debt expense Columbia of Maryland $ 1.3 $ 0.9 Incremental costs (including incremental bad debt expense) incurred to ensure that customers have essential utility service during the state of emergency in Maryland. Such incremental costs must be offset by any benefit received in connection with the pandemic

Risk Management Activities (Tab

Risk Management Activities (Tables)	12 Months Ended
	Dec. 31, 2022
Risk Management Activities [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	Risk management assets and liabilities on our derivatives are presented on the Consolidated Balance Sheets as shown below: December 31, 2022 December 31, 2021 (in millions) Assets Liabilities Assets Liabilities Current (1) Derivatives designated as hedging instruments $ — $ — $ — $ 136.4 Derivatives not designated as hedging instruments 18.8 1.1 10.6 0.4 Total $ 18.8 $ 1.1 $ 10.6 $ 136.8 Noncurrent (2) Derivatives designated as hedging instruments $ — $ — $ — $ — Derivatives not designated as hedging instruments 66.0 1.9 13.8 7.4 Total $ 66.0 $ 1.9 $ 13.8 $ 7.4 (1) Presented in "Prepayments and other" and "Other accruals", respectively, on the Consolidated Balance Sheets. (2) Presented in "Deferred charges and other" and "Other noncurrent liabilities", respectively, on the Consolidated Balance Sheets.
Reclassification out of Accumulated Other Comprehensive Income	Cash flow hedges included in "Accumulated other comprehensive loss" on the Consolidated Balance Sheets were: (in millions) AOCI (1) Gain Expected to be Reclassified to Earnings During the Next 12 Months (1) Maximum Term Interest Rate $ (12.6) (0.3) 353 months (1) All amounts are net of tax.

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Schedule Of Components Of Income Tax Expense	The components of income tax expense (benefit) were as follows: Year Ended December 31, (in millions) 2022 2021 2020 Income Taxes Current Federal $ 0.4 $ (0.1) $ 0.2 State 7.3 6.0 11.7 Total Current 7.7 5.9 11.9 Deferred Federal 181.0 99.2 (0.4) State (23.0) 13.8 (27.4) Total Deferred 158.0 113.0 (27.8) Deferred Investment Credits (1.1) (1.1) (1.2) Income Taxes $ 164.6 $ 117.8 $ (17.1)
Schedule Of Reasons Behind Differences In Computation Of Total Income Taxes	The following table represents a reconciliation of income tax expense at the statutory federal income tax rate to the actual income tax expense from continuing operations: Year Ended December 31, (in millions) 2022 2021 2020 Book income (loss) before income taxes $ 956.4 $ 706.6 $ (31.3) Tax expense (benefit) at statutory federal income tax rate 200.8 21.0 % 148.3 21.0 % (6.6) 21.0 % Increases (reductions) in taxes resulting from: State income taxes, net of federal income tax benefit 4.5 0.5 14.1 2.0 (11.7) 37.4 Amortization of regulatory liabilities (38.5) (4.0) (39.1) (5.5) (38.4) 122.7 Fines and penalties 0.3 — — — 11.8 (37.7) Employee stock ownership plan dividends and other compensation (1.2) (0.1) (1.2) (0.2) (1.3) 4.2 Deferred taxes on TCJA regulatory liability divested — — — — 23.3 (74.5) Tax accrual adjustments 0.2 — (0.1) — 8.9 (28.4) Federal tax credits (2.3) (0.2) (2.1) (0.3) (2.5) 8.0 Other adjustments 0.8 — (2.1) (0.3) (0.6) 1.9 Income Taxes $ 164.6 17.2 % $ 117.8 16.7 % $ (17.1) 54.6 %
Schedule Of Principal Components Of Net Deferred Tax Liability	Deferred income taxes result from temporary differences between the financial statement carrying amounts and the tax basis of existing assets and liabilities. The principal components of our net deferred tax liability were as follows: At December 31, (in millions) 2022 2021 Deferred tax liabilities Accelerated depreciation and other property differences $ 2,527.9 $ 2,454.4 Other regulatory assets 348.4 308.6 Total Deferred Tax Liabilities 2,876.3 2,763.0 Deferred tax assets Other regulatory liabilities and deferred investment tax credits (including TCJA) 294.3 284.7 Pension and other postretirement/postemployment benefits 124.7 104.8 Net operating loss carryforward and AMT credit carryforward 491.0 545.9 Environmental liabilities 20.7 22.2 Other accrued liabilities 55.9 42.1 Other, net 43.0 111.7 Total Deferred Tax Assets 1,029.6 1,111.4 Valuation Allowance (7.8) (7.8) Net Deferred Tax Assets 1,021.8 1,103.6 Net Deferred Tax Liabilities $ 1,854.5 $ 1,659.4
Schedule of Unrecognized Tax Benefits Roll Forward	A reconciliation of the beginning and ending amounts of unrecognized tax benefits is as follows: At December 31, 2022, (in millions) 2022 2021 2020 Opening Balance $ 21.7 $ 21.7 $ 23.2 Gross decreases - tax positions in prior period — — (1.5) Gross increases - current period tax positions — — — Ending Balance $ 21.7 $ 21.7 $ 21.7 Offset for net operating loss carryforwards (21.7) (21.7) (21.7) Balance, Less Net Operating Loss Carryforwards $ — $ — $ —

Pension and Other Postretirem_2

Pension and Other Postretirement Benefits (Tables)	12 Months Ended
	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Schedule Of Allocation of Plan Assets	December 31, 2022 Defined Benefit Pension Plan Postretirement Benefit Plan Asset Category Minimum Maximum Minimum Maximum Domestic Equities 7% 27% 0% 55% International Equities 3% 13% 0% 25% Fixed Income 69% 81% 20% 100% Real Estate 0% 3% 0% 0% Private Equity 0% 3% 0% 0% Short-Term Investments 0% 10% 0% 10% December 31, 2021 Defined Benefit Pension Plan Postretirement Benefit Plan Asset Category Minimum Maximum Minimum Maximum Domestic Equities 7% 27% 0% 55% International Equities 3% 13% 0% 25% Fixed Income 69% 81% 20% 100% Real Estate 0% 3% 0% 0% Private Equity 0% 3% 0% 0% Short-Term Investments 0% 10% 0% 10% The actual Pension Plan and Postretirement Plan Asset Mix at December 31, 2022 and December 31, 2021 are as follows: Defined Benefit Pension Assets (1) December 31, Postretirement December 31, Asset Class (in millions) Asset Value % of Total Assets Asset Value % of Total Assets Domestic Equities $ 231.1 16.2 % $ 86.9 38.6 % International Equities 119.0 8.4 % 36.6 16.3 % Fixed Income 1,004.3 70.6 % 94.7 42.1 % Real Estate 5.0 0.3 % — — Cash/Other 63.4 4.5 % 6.7 3.0 % Total $ 1,422.8 100.0 % $ 224.9 100.0 % Defined Benefit Pension Assets (1) December 31, Postretirement Benefit Plan Assets December 31, Asset Class (in millions) Asset Value % of Total Assets Asset Value % of Total Assets Domestic Equities $ 324.3 16.4 % $ 118.6 40.4 % International Equities 150.9 7.6 % 50.5 17.2 % Fixed Income 1,382.3 69.7 % 118.8 40.4 % Real Estate 37.2 1.9 % — — Cash/Other 87.0 4.4 % 5.8 2.0 % Total $ 1,981.7 100.0 % $ 293.7 100.0 % (1) Total includes accrued dividends and pending trades with brokers.
Schedule Of Fair Value and Changes In The Fair Value Of The Plan Assets	Fair Value Measurements at December 31, 2022: (in millions) December 31, Quoted Prices in Active Markets for Significant Other Significant Pension plan assets: Cash $ 2.5 $ 2.0 $ 0.5 $ — Equity securities International equities 0.5 0.5 — — Fixed income securities Government 316.3 — 316.3 — Corporate 407.8 — 407.8 — Mortgages/ Asset Backed Securities 2.3 — 2.3 — Other fixed income 1.9 1.9 — — Mutual Funds U.S. multi-strategy 97.4 97.4 — — International equities 29.0 29.0 — — Fixed income 0.2 0.2 — — Private equity limited partnerships (3) U.S. multi-strategy (1) 6.3 — — — International multi-strategy (2) 2.3 — — — Distressed opportunities 0.1 — — — Real estate (3) 5.0 — — — Commingled funds (3) Short-term money markets 46.2 — — — U.S. equities 133.7 — — — International equities 89.6 — — — Fixed income 275.9 — — — Pension plan assets subtotal $ 1,417.0 $ 131.0 $ 726.9 $ — Other postretirement benefit plan assets: Mutual funds U.S. multi-strategy 76.2 76.2 — — International equities 16.3 16.3 — — Fixed income 94.7 94.7 — — Commingled funds (3) Short-term money markets 17.4 — — — U.S. equities 10.7 — — — International equities 20.3 — — — Other postretirement benefit plan assets subtotal $ 235.6 $ 187.2 $ — $ — Due to brokers, net (4) (2.0) — (2.0) — Receivables/payables (10.7) — (10.7) — Accrued income/dividends 7.8 7.8 — — Total pension and other postretirement benefit plan assets $ 1,647.7 $ 326.0 $ 714.2 $ — (1) This class includes limited partnerships/fund of funds that invest in a diverse portfolio of private equity strategies, including buy-outs, growth capital, special situations and secondary markets, primarily inside the United States. (2) This class includes limited partnerships/fund of funds that invest a in diverse portfolio of private equity strategies, including buy-outs, growth capital, special situations and secondary markets, primarily outside the United States. (3) This class of investments is measured at fair value using the net asset value per share and has not been classified in the fair value hierarchy. (4) This class represents pending trades with brokers. The table below sets forth a summary of unfunded commitments, redemption frequency and redemption notice periods for certain investments that are measured at fair value using the net asset value per share for the year ended December 31, 2022: (in millions) Fair Value Unfunded Commitments Redemption Frequency Redemption Notice Period Commingled Funds Short-term money markets $ 63.6 $ — Daily 1 day U.S. equities 144.4 — Daily 1 day - 5 days International equities 109.9 — Monthly 10 days-30 days Fixed income 275.9 — Daily 3 days Private Equity and Real Estate Limited Partnerships (1) 13.7 11.6 N/A N/A Total $ 607.5 $ 11.6 (1) Private equity and real estate limited partnerships typically call capital over a 3-5 year period and pay out distributions as the underlying investments are liquidated. The typical expected life of these limited partnerships is 0-15 years, and these investments typically cannot be redeemed prior to liquidation. Fair Value Measurements at December 31, 2021: (in millions) December 31, Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Significant Pension plan assets: Cash $ 10.3 $ 9.7 $ 0.6 $ — Equity securities International equities 0.5 0.5 — — Fixed income securities Government 387.3 — 387.3 — Corporate 645.9 — 645.9 — Mutual Funds U.S. multi-strategy 128.4 128.4 — — International equities 38.7 38.7 — — Private equity limited partnerships (3) U.S. multi-strategy (1) 10.9 — — — International multi-strategy (2) 4.5 — — — Distressed opportunities 0.1 — — — Real estate (3) 37.2 — — — Commingled funds (3) Short-term money markets 55.0 — — — U.S. equities 195.9 — — — International equities 111.7 — — — Fixed income 349.1 — — — Pension plan assets subtotal $ 1,975.5 $ 177.3 $ 1,033.8 $ — Other postretirement benefit plan assets: Mutual funds U.S. multi-strategy 103.8 103.8 — — International equities 24.4 24.4 — — Fixed income 118.5 118.5 — — Commingled funds (3) Short-term money markets 5.8 — — — U.S. equities 14.8 — — — International equities 26.1 — — — Other postretirement benefit plan assets subtotal $ 293.4 $ 246.7 $ — $ — Due to brokers, net (4) (1.8) — (1.8) — Receivables/payables 0.3 — 0.3 — Accrued income/dividends 8.0 8.0 — — Total pension and other postretirement benefit plan assets $ 2,275.4 $ 432.0 $ 1,032.3 $ — (1) This class includes limited partnerships/fund of funds that invest in a diverse portfolio of private equity strategies, including buy-outs, venture capital, growth capital, special situations and secondary markets, primarily inside the United States. (2) This class includes limited partnerships/fund of funds that invest in diverse portfolio of private equity strategies, including buy-outs, venture capital, growth capital, special situations and secondary markets, primarily outside the United States. (3) This class of investments is measured at fair value using the net asset value per share and has not been classified in the fair value hierarchy. (4) This class represents pending trades with brokers. The table below sets forth a summary of unfunded commitments, redemption frequency and redemption notice periods for certain investments that are measured at fair value using the net asset value per share for the year ended December 31, 2021: (in millions) Fair Value Unfunded Commitments Redemption Frequency Redemption Notice Period Commingled Funds Short-term money markets $ 60.8 $ — Daily 1 day U.S. equities 210.7 — Daily 1 day -5 days International equities 137.8 — Monthly 10 days - 30 days Fixed income 349.1 — Daily 3 days Private Equity and Real Estate Limited Partnerships (1) 20.4 12.1 N/A N/A Total $ 778.8 $ 12.1 (1) Private equity and real estate limited partnerships typically call capital over a 3-5 year period and pay out distributions as the underlying investments are liquidated. The typical expected life of these limited partnerships is 0-15 years, and these investments typically cannot be redeemed prior to liquidation.
Schedule Of Reconciliation Of The Plan Funded Status	The following table provides a reconciliation of the plans’ funded status and amounts reflected in our Consolidated Balance Sheets at December 31 based on a December 31 measurement date: Pension Benefits Other Postretirement Benefits (in millions) 2022 2021 2022 2021 Change in projected benefit obligation (1) Benefit obligation at beginning of year $ 1,852.4 $ 2,058.4 $ 556.2 $ 590.8 Service cost 27.8 30.2 6.5 6.2 Interest cost 40.5 31.4 12.0 9.9 Plan participants’ contributions — — 4.1 4.2 Plan amendments 0.2 — 2.1 0.1 Actuarial gain (2) (318.7) (68.7) (89.9) (14.8) Benefits paid (174.8) (198.9) (42.3) (40.6) Estimated benefits paid by incurred subsidy — — 0.3 0.4 Projected benefit obligation at end of year $ 1,427.4 $ 1,852.4 $ 449.0 $ 556.2 Change in plan assets Fair value of plan assets at beginning of year $ 1,981.7 $ 2,117.7 $ 293.7 $ 286.4 Actual return on plan assets (386.8) 58.9 (51.9) 23.9 Employer contributions 2.7 4.0 21.3 19.8 Plan participants’ contributions — — 4.1 4.2 Benefits paid (174.8) (198.9) (42.3) (40.6) Fair value of plan assets at end of year $ 1,422.8 $ 1,981.7 $ 224.9 $ 293.7 Funded Status at end of year $ (4.6) $ 129.3 $ (224.1) $ (262.5) Amounts recognized in the statement of financial position consist of: Noncurrent assets 18.3 159.3 — — Current liabilities (2.6) (2.8) (1.0) (1.0) Noncurrent liabilities (20.3) (27.2) (223.1) (261.5) Net amount recognized at end of year (3) $ (4.6) $ 129.3 $ (224.1) $ (262.5) Amounts recognized in accumulated other comprehensive income or regulatory asset/liability (4) Unrecognized prior service credit $ 0.4 $ 0.3 $ (3.4) $ (7.8) Unrecognized actuarial loss 564.2 438.0 64.0 88.5 Net amount recognized at end of year $ 564.6 $ 438.3 $ 60.6 $ 80.7 (1) The change in benefit obligation for Pension Benefits represents the change in Projected Benefit Obligation while the change in benefit obligation for Other Postretirement Benefits represents the change in accumulated postretirement benefit obligation. (2) The pension actuarial gain was primarily driven by the increase in discount rate. The postretirement benefit gain was also primarily driven by an increase in discount rates. (3) We recognize our Consolidated Balance Sheets underfunded and overfunded status of our various defined benefit postretirement plans, measured as the difference between the fair value of the plan assets and the benefit obligation. (4) We determined that for certain rate-regulated subsidiaries the future recovery of pension and other postretirement benefits costs is probable. These rate-regulated subsidiaries recorded regulatory assets and liabilities of $607.5 million and zero, respectively, as of December 31, 2022, and $512.1 million and zero, respectively, as of December 31, 2021 that would otherwise have been recorded to accumulated other comprehensive loss.
Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets	Information for pension plans with a projected benefit obligation in excess of plan assets: December 31, 2022 2021 Accumulated Benefit Obligation $ 22.9 $ 30.0 Funded Status Projected Benefit Obligation 22.9 30.0 Funded Status of Underfunded Pension Plans at End of Year (1) $ (22.9) $ (30.0) (1) As of December 31, 2022 and 2021, only our nonqualified plans were underfunded. These plans have no assets as they are not funded until benefits are paid. Information for pension plans with plan assets in excess of the projected benefit obligation: December 31, 2022 2021 Accumulated Benefit Obligation $ 1,393.8 $ 1,804.3 Funded Status Projected Benefit Obligation 1,404.5 1,822.4 Fair Value of Plan Assets 1,422.8 1,981.7 Funded Status of Overfunded Pension Plans at End of Year $ 18.3 $ 159.3
Schedule Of Expected Payments To Participants In Pension Plan	The expected benefits are estimated based on the same assumptions used to measure our benefit obligation at the end of the year and include benefits attributable to the estimated future service of employees: (in millions) Pension Benefits Other Federal Year(s) 2023 $ 150.5 $ 38.9 $ 0.4 2024 145.2 38.5 0.2 2025 141.2 37.8 0.2 2026 133.8 36.9 0.2 2027 128.1 36.4 0.2 2028-2032 563.2 172.0 0.9
Components Of The Plans' Net Periodic Benefits Cost	The following table provides the components of the plans’ actuarially determined net periodic benefits cost for each of the three years ended December 31, 2022, 2021 and 2020: Pension Benefits Other Postretirement (in millions) 2022 2021 2020 2022 2021 2020 Components of Net Periodic Benefit (Income) Cost (1) Service cost $ 27.8 $ 30.2 $ 32.0 $ 6.5 $ 6.2 $ 6.6 Interest cost 40.5 31.4 51.6 12.0 9.9 15.4 Expected return on assets (90.8) (101.6) (111.6) (16.2) (15.3) (14.4) Amortization of prior service cost (credit) 0.1 0.1 0.7 (2.2) (2.2) (2.1) Recognized actuarial loss 20.3 21.7 33.8 2.6 4.6 4.9 Settlement/curtailment loss 12.4 11.4 10.5 — — 1.5 Total Net Periodic Benefits (Income) Cost $ 10.3 $ (6.8) $ 17.0 $ 2.7 $ 3.2 $ 11.9 (1) Service cost is presented in "Operation and maintenance" on the Statements of Consolidated Income (Loss). Non-service cost components are presented within "Other, net."
Schedule Of Significant Actuarial Assumptions In Determining Funded Status Plan	The following table provides the key assumptions that were used to calculate the pension and other postretirement benefits obligations for our various plans as of December 31: Pension Benefits Other Postretirement Benefits 2022 2021 2022 2021 Weighted-average assumptions to Determine Benefit Obligation Discount Rate 5.14 % 2.76 % 5.17 % 2.85 % Rate of Compensation Increases 4.00 % 4.00 % N/A N/A Interest Crediting Rates 4.00 % 4.00 % N/A N/A Health Care Trend Rates Trend for Next Year N/A N/A 6.69 % 6.20 % Ultimate Trend N/A N/A 4.75 % 4.50 % Year Ultimate Trend Reached N/A N/A 2032 2030 The following table provides the key assumptions that were used to calculate the net periodic benefits cost for our various plans: Pension Benefits Other Postretirement 2022 2021 2020 2022 2021 2020 Weighted-average Assumptions to Determine Net Periodic Benefit Cost Discount rate - service cost 3.08 % 2.81 % 3.39 % 3.21 % 3.00 % 3.52 % Discount rate - interest cost 2.11 % 1.57 % 2.65 % 2.24 % 1.73 % 2.76 % Expected Long-Term Rate of Return on Plan Assets 4.80 % 5.20 % 5.70 % 5.72 % 5.50 % 5.67 % Rate of Compensation Increases 4.00 % 4.00 % 4.00 % N/A N/A N/A Interest Crediting Rates 4.00 % 4.00 % 4.00 % N/A N/A N/A
Schedule Of Changes In Plan Assets And Projected Benefit Obligations Recognized In Other Comprehensive Income	The following table provides other changes in plan assets and projected benefit obligations recognized in other comprehensive income or regulatory asset or liability: Pension Benefits Other Postretirement (in millions) 2022 2021 2022 2021 Other Changes in Plan Assets and Projected Benefit Obligations Net prior service cost $ 0.2 $ — $ 2.1 $ 0.1 Net actuarial loss (gain) 158.9 (26.0) (21.8) (23.3) Settlements/curtailments (12.4) (11.4) — — Less: amortization of prior service cost (0.1) (0.1) 2.2 2.2 Less: amortization of net actuarial loss (20.3) (21.7) (2.6) (4.6) Total Recognized in Other Comprehensive Income or Regulatory $ 126.3 $ (59.2) $ (20.1) $ (25.6) Amount Recognized in Net Periodic Benefits Cost and Other $ 136.6 $ (66.0) $ (17.4) $ (22.4)

Equity (Tables)

Equity (Tables)	12 Months Ended
	Dec. 31, 2022
Equity [Abstract]
Schedule Of Stock Offering Program	The following table summarizes our activity under the ATM program. Year Ending December 31, 2022 2021 2020 Number of shares issued 5,941,598 12,525,215 8,459,430 Average price per share $ 25.25 $ 23.95 $ 23.60 Proceeds, net of fees ( in millions) $ 141.9 $ 288.1 $ 196.5
Schedule of Stock by Class - Preferred	The following table summarizes preferred stock by outstanding series of shares: Year ended December 31, December 31, December 31, 2022 2021 2020 2022 2021 (in millions except shares and per share amounts) Liquidation Preference Per Share Shares Dividends Declared Per Share Outstanding 5.650% Series A $ 1,000.00 400,000 $ 56.50 $ 56.50 $ 56.50 $ 393.9 $ 393.9 6.500% Series B 25,000.00 20,000 1,625.00 1,625.00 1,625.00 486.1 486.1 Series C (1) $ 1,000.00 862,500 — — — $ 666.5 $ 666.5 (1) The Series C Mandatory Convertible Preferred Stock initially will not bear any dividends. We recorded the initial present value of the purchase contract payments as a liability with a corresponding reduction to preferred stock. Equity Units. On April 19, 2021, we completed the sale of 8.625 million Equity Units, initially consisting of Corporate Units, each with a stated amount of $100. The offering generated net proceeds of $835.5 million, after underwriting and issuance expenses. Each Corporate Unit consists of a forward contract to purchase shares of our common stock in the future and a 1/10th, or 10%, undivided beneficial ownership interest in one share of Series C Mandatory Convertible Preferred Stock, par value $0.01 per share, with a liquidation preference of $1,000 per share. Selected information about the Equity Units is presented below: (in millions except contract rate) Issuance Date Units Issued Total Net Proceeds (1) Purchase Contract Annual Rate Purchase Contract Liability Equity Units April 19, 2021 8.625 $ 835.5 7.75 % $ 168.8 (1) Issuance costs of $27.0 million were recorded on a relative fair value basis as a reduction to preferred stock of $22.5 million and a reduction to the purchase contract liability of $4.5 million. The purchase contract obligates holders to purchase shares of our common stock on December 1, 2023, subject to early settlement in certain situations. The purchase price paid under the purchase contract is $100 and the number of shares to be purchased will be determined under a settlement rate formula based on the volume-weighted average share price of our common stock near the settlement date, subject to a maximum settlement rate. The Series C Mandatory Convertible Preferred Stock will initially be pledged upon issuance as collateral to secure the purchase of common stock under the related purchase contracts. The Series C Mandatory Convertible Preferred Stock is expected to be remarketed prior to December 1, 2023, and each share, unless previously converted, will automatically convert to common stock based on a conversion rate on the mandatory conversion date, which is expected to be on or about March 1, 2024. The conversion rate will be determined based on the volume-weighted average share price of our common stock near the conversion date, subject to a minimum and maximum conversion rate. Prior to December 1, 2023, the Series C Mandatory Convertible Preferred Stock will not bear any dividends and the liquidation preference will not accrete. Following a successful remarketing, dividends may become payable on the Series C Mandatory Convertible Preferred Stock and/or the minimum conversion rate of the Series C Mandatory Convertible Preferred Stock may be increased. If no successful remarketing of the Series C Mandatory Convertible Preferred Stock has previously occurred, effective as of December 1, 2023, the conversion rate will be zero, no shares of our common stock will be delivered upon automatic conversion and each share of Series C Mandatory Convertible Preferred Stock will be automatically transferred to us on the mandatory conversion date without any payment of cash or shares of our common stock thereon. In the event of such a remarketing failure, any shares of Series C Mandatory Convertible Preferred Stock held as part of Corporate Units will be automatically delivered to us on December 1, 2023 in full satisfaction of the relevant holder's obligation under the related purchase contracts. We will pay quarterly contract adjustment payments at the rate of 7.75% per year on the stated amount of $100 per Equity Unit. The contract adjustment payments are payable in cash, shares of our common stock or a combination thereof, at our election. The payment of contract adjustment payments may also be deferred until the purchase contract settlement date, December 1, 2023, at our election. If we exercise our option to defer the payment of contract adjustment payments, then until the deferred contract adjustment payments have been paid, we will not declare or pay any dividends on, or make any distributions on, or redeem, purchase or acquire, or make a liquidation payment with respect to, any shares of our capital stock; make any payment of principal of, or interest or premium, if any, on, or repay, repurchase or redeem any of our debt securities that rank on parity with, or junior to, the contract adjustment payments; or make any guarantee payments under any guarantee by us of securities of any of our subsidiaries if our guarantee ranks on parity with, or junior to, the contract adjustment payments. As of December 31, 2022, no contract adjustment payments have been deferred with quarterly cash payments being remitted to the holders. As of December 31, 2022 and December 31, 2021 the purchase contract liability was $65.0 million and $129.4 million, respectively. Purchase contract payments are recorded against this liability. Accretion of the purchase contract liability is recorded as interest expense. Cash payments of $66.8 million and $41.2 million were made during the years ended December 31, 2022 and 2021, respectively. The Series C Mandatory Convertible Preferred Stock and forward purchase contracts are legally detachable and separately exercisable, however, due to the economic linkage between the forward purchase contract and the Series C Mandatory Convertible Preferred Stock, we have concluded that the ability to separate the Corporate Units is non-substantive. Accordingly, we are accounting for the Corporate Units as a single unit of account. We recorded the initial present value of the purchase contract payments as a liability with a corresponding reduction to preferred stock. This liability is included in "Other accruals"go on the Consolidated Balance Sheets. Refer to Note 5, "Earnings Per Share," for additional information regarding our treatment of the Equity Units for diluted EPS. Under the terms of the Equity Units, assuming no anti-dilution or other adjustments such as a fundamental change, the maximum number of shares of common stock we will issue under the purchase contracts is 35.2 million and maximum number of shares of common stock we will issue under the Series C Mandatory Convertible Preferred Stock is 35.2 million. Had we settled the remaining purchase contract payment balance in shares at December 31, 2022, we would have issued approximately 2.5 million shares. Noncontrolling Interest in Consolidated Subsidiaries. As of December 31, 2022 and 2021, NIPSCO and tax equity partners have completed their cash contributions into the Indiana Crossroads Wind and Rosewater JVs and made initial cash contributions into the Indiana Crossroads Solar JV. Earnings, tax attributes and cash flows are allocated to both NIPSCO and the respective tax equity partners in varying percentages by category and over the life of the partnership. The tax equity partner's contributions, net of these allocations, is represented as a noncontrolling interest within total equity on the Consolidated Balance Sheets. Refer to Note 4, "Variable Interest Entities," for more information.

Share-Based Compensation (Table

Share-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2022
Share-Based Payment Arrangement, Noncash Expense [Abstract]
Performance Award Details	The following table presents details of the performance awards described above. Award Year Service Conditions Lapse date Performance Period Award Conditions Shares outstanding at 12/31/2022 (shares) Grant Date Fair Value (in millions) 2022 02/28/25 01/01/2022- Non-GAAP Financial Measure 245,445 $ 7.4 Relative Total Shareholder Return 245,445 $ 10.6 2021 02/28/24 01/01/2021- Non-GAAP Financial Measure 192,119 $ 6.5 Relative Total Shareholder Return 192,119 $ 6.7 Relative Total Shareholder Return 88,541 $ 3.2 02/28/23 01/01/2021- 12/31/2022 Relative Total Shareholder Return 179,703 $ 4.8 2020 02/28/23 01/01/2020- 12/31/2022 Non-GAAP Financial Measure 294,424 $ 11.7 Operational Measures 67,943 $ 2.6
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule Of Transactions Of Share Based Compensation Other Than Stock Options	(shares) Restricted Stock Weighted Average Non-vested at December 31, 2021 572,154 22.72 Granted 477,292 26.29 Forfeited (133,367) 23.48 Vested (117,564) 24.44 Non-vested at December 31, 2022 798,515 24.48
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule Of Transactions Of Share Based Compensation Other Than Stock Options	(shares) Performance Weighted Average Non-vested at December 31, 2021 1,798,151 23.78 Granted 566,086 31.65 Forfeited (427,607) 24.34 Vested (430,890) 25.44 Non-vested at December 31, 2022 1,505,740 26.10

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2022
Long-Term Debt, Current and Noncurrent [Abstract]
Schedule of Long-Term Debt	Our long-term debt as of December 31, 2022 and 2021 is as follows: Long-term debt type Maturity as of December 31, 2022 Weighted average interest rate (%) Outstanding balance as of December 31, (in millions) 2022 2021 Senior notes: NiSource August 2025 0.95 % $ 1,250.0 1,250.0 NiSource May 2027 3.49 % 1,000.0 1,000.0 NiSource December 2027 6.78 % 3.0 3.0 NiSource September 2029 2.95 % 750.0 750.0 NiSource May 2030 3.60 % 1,000.0 1,000.0 NiSource February 2031 1.70 % 750.0 750.0 NiSource December 2040 6.25 % 152.6 152.6 NiSource June 2041 5.95 % 347.4 347.4 NiSource February 2042 5.80 % 250.0 250.0 NiSource February 2043 5.25 % 500.0 500.0 NiSource February 2044 4.80 % 750.0 750.0 NiSource February 2045 5.65 % 500.0 500.0 NiSource May 2047 4.38 % 1,000.0 1,000.0 NiSource March 2048 3.95 % 750.0 750.0 NiSource June 2052 5.00 % 350.0 $ — Total senior notes $ 9,353.0 $ 9,003.0 Medium term notes: NiSource May 2027 7.99 % $ 29.0 $ 49.0 NIPSCO June 2027 to August 2027 7.64 % 58.0 68.0 Columbia of Massachusetts December 2025 to February 2028 6.37 % 15.0 15.0 Total medium term notes $ 102.0 $ 132.0 Finance leases: NiSource Corporate Services December 2022 to December 2026 2.34 % $ 48.6 51.4 NIPSCO December 2027 to November 2035 1.87 % 16.5 18.7 Columbia of Ohio December 2025 to March 2044 6.15 % 83.5 87.8 Columbia of Virginia July 2029 to November 2039 6.26 % 17.0 17.7 Columbia of Kentucky May 2027 3.79 % 0.2 0.2 Columbia of Pennsylvania July 2027 to May 2035 6.28 % 8.9 9.8 Total finance leases $ 174.7 185.6 Unamortized issuance costs and discounts $ (76.1) $ (79.1) Total Long-Term Debt $ 9,553.6 $ 9,241.5

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2022
Leases [Abstract]
Lease Cost	Income statement presentation for these costs (when ultimately recognized on the income statement) is also included: Year Ended December 31, (in millions) Income Statement Classification 2022 2021 Finance lease cost Amortization of right-of-use assets Depreciation and amortization $ 31.9 $ 28.8 Interest on lease liabilities Interest expense, net 8.5 9.4 Total finance lease cost 40.4 38.2 Operating lease cost Operation and maintenance 10.4 15.6 Total lease cost $ 50.8 $ 53.8
Right-of-Use Assets and Liabilities	Our right-of-use assets and liabilities are presented in the following lines on the Consolidated Balance Sheets: At December 31, (in millions) Balance Sheet Classification 2022 2021 Assets Finance leases Net Property, Plant and Equipment $ 153.4 $ 165.7 Operating leases Deferred charges and other 35.7 33.8 Total leased assets $ 189.1 199.5 Liabilities Current Finance leases Current portion of long-term debt $ 30.0 28.1 Operating leases Other accruals 4.8 6.7 Noncurrent Finance leases Long-term debt, excluding amounts due within one year 144.7 157.5 Operating leases Other noncurrent liabilities 31.9 27.9 Total lease liabilities $ 211.4 $ 220.2
Lease Information	Other pertinent information related to leases was as follows: Year Ended December 31, (in millions) 2022 2021 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows used for finance leases $ 8.6 $ 9.4 Operating cash flows used for operating leases 10.3 15.4 Financing cash flows used for finance leases 30.3 25.7 Right-of-use assets obtained in exchange for lease obligations Finance leases 19.3 22.4 Operating leases $ 8.8 $ 6.0 December 31, 2022 December 31, 2021 Weighted-average remaining lease term (years) Finance leases 9.9 10.6 Operating leases 7.7 8.5 Weighted-average discount rate Finance leases 5.1 % 5.0 % Operating leases 4.0 % 3.7 %
Lease Maturity	Maturities of our lease liabilities as of December 31, 2022 were as follows: As of December 31, 2022, (in millions) Total Finance Leases Operating Leases 2023 $ 46.8 $ 38.9 $ 7.9 2024 37.3 30.9 6.4 2025 30.3 24.5 5.8 2026 24.7 19.4 5.3 2027 19.9 15.4 4.5 Thereafter 110.8 97.4 13.4 Total lease payments 269.8 226.5 43.3 Less: Imputed interest (58.4) (51.8) (6.6) Total $ 211.4 $ 174.7 $ 36.7 Reported as of December 31, 2022 Short-term lease liabilities 34.8 30.0 4.8 Long-term lease liabilities 176.6 144.7 31.9 Total lease liabilities $ 211.4 $ 174.7 $ 36.7

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following tables present financial assets and liabilities measured and recorded at fair value on our Consolidated Balance Sheets on a recurring basis and their level within the fair value hierarchy as of December 31, 2022 and December 31, 2021: Recurring Fair Value Measurements December 31, 2022 ( in millions ) Quoted Prices Significant Other Significant Balance as of December 31, 2022 Assets Risk management assets $ — $ 84.8 $ — $ 84.8 Available-for-sale debt securities — 151.6 — 151.6 Total $ — $ 236.4 $ — $ 236.4 Liabilities Risk management liabilities — 3.0 — 3.0 Total $ — $ 3.0 $ — $ 3.0 Recurring Fair Value Measurements December 31, 2021 ( in millions ) Quoted Prices Significant Other Significant Balance as of December 31, 2021 Assets Risk management assets $ — $ 24.4 $ — $ 24.4 Available-for-sale debt securities — 171.8 — 171.8 Total $ — $ 196.2 $ — $ 196.2 Liabilities Risk management liabilities $ — $ 144.2 $ — $ 144.2 Total $ — $ 144.2 $ — $ 144.2
Debt Securities, Available-for-sale	The amortized cost, gross unrealized gains and losses, allowance for credit losses, and fair value of available-for-sale securities at December 31, 2022 and 2021 were: December 31, 2022 (in millions) Amortized Gross Gross Unrealized Losses (1) Allowance for Credit Losses Fair Value Available-for-sale debt securities U.S. Treasury debt securities $ 67.7 $ — $ (4.5) $ — $ 63.2 Corporate/Other debt securities 99.0 — (9.7) (0.9) 88.4 Total $ 166.7 $ — $ (14.2) $ (0.9) $ 151.6 December 31, 2021 (in millions) Amortized Gross Gross Unrealized Losses (2) Allowance for Credit Losses Fair Value Available-for-sale debt securities U.S. Treasury debt securities $ 52.8 $ 0.1 $ (0.4) $ — $ 52.5 Corporate/Other debt securities 116.5 3.7 (0.7) (0.2) 119.3 Total $ 169.3 $ 3.8 $ (1.1) $ (0.2) $ 171.8 (1) Fair value of U.S. Treasury debt securities and Corporate/Other debt securities in an unrealized loss position without an allowance for credit losses is $61.0 and $85.5 million, respectively, at December 31, 2022. (2) Fair value of U.S. Treasury debt securities and Corporate/Other debt securities in an unrealized loss position without an allowance for credit losses is $36.2 million and $35.4 million, respectively, at December 31, 2021.
Carrying Amount And Estimated Fair Values Of Financial Instruments	The carrying amount and estimated fair values of these financial instruments were as follows: At December 31, (in millions) Carrying Amount 2022 Estimated Fair Value 2022 Carrying Amount 2021 Estimated Fair Value 2021 Long-term debt (including current portion) $ 9,553.6 $ 8,479.4 $ 9,241.5 $ 10,415.7

Other Commitments And Conting_2

Other Commitments And Contingencies (Tables)	12 Months Ended
	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Contractual Obligation, Fiscal Year Maturity	Contractual Obligations. We have certain contractual obligations requiring payments at specified periods. The obligations include long-term debt, lease obligations, energy commodity contracts and obligations for various services including pipeline capacity and outsourcing of IT services. The total contractual obligations in existence at December 31, 2022 and their maturities were: (in millions) Total 2023 2024 2025 2026 2027 After Long-term debt (1) $ 9,455.0 $ — $ — $ 1,260.0 $ — $ 1,090.0 $ 7,105.0 Interest payments on long-term debt 5,890.4 351.6 351.6 351.6 339.1 319.7 4,176.8 Finance leases (2) 226.5 38.9 30.9 24.5 19.4 15.4 97.4 Operating leases (3) 43.3 7.9 6.4 5.8 5.3 4.5 13.4 Energy commodity contracts 231.7 119.7 76.0 36.0 — — — Service obligations: Pipeline service obligations 2,484.9 642.2 556.9 410.5 337.2 328.8 209.3 IT service obligations 177.4 71.9 50.0 41.3 11.4 2.8 — Other liabilities (4) 654.2 612.5 6.2 5.9 5.2 5.2 19.2 Total contractual obligations $ 19,163.4 $ 1,844.7 $ 1,078.0 $ 2,135.6 $ 717.6 $ 1,766.4 $ 11,621.1 (1) Long-term debt balance excludes unamortized issuance costs and discounts of $76.1 million. (2) Finance lease payments shown above are inclusive of interest totaling $51.8 million. (3) Operating lease payments shown above are inclusive of interest totaling $6.6 million. Operating lease balances do not include obligations for possible fleet vehicle lease renewals beyond the initial lease term. While we have the ability to renew these leases beyond the initial term, we are not reasonably certain to do so as they are renewed month-to-month after the first year. (4) Other liabilities shown above are inclusive of the Rosewater, Indiana Crossroads Wind, and Indiana Crossroads Solar Developer payments due in 2023 and Equity Unit purchase contract liability payments to be made in 2023.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2022
Components of Accumulated Other Comprehensive Income (Loss) [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table displays the activity of Accumulated Other Comprehensive Loss, net of tax: (in millions) Gains and Losses on Securities (1) Gains and Losses on Cash Flow Hedges (1) Pension and OPEB Items (1) Accumulated Other Comprehensive Loss (1) Balance as of January 1, 2020 $ 3.3 $ (77.2) $ (18.7) $ (92.6) Other comprehensive income (loss) before reclassifications 3.3 (70.8) 2.9 (64.6) Amounts reclassified from accumulated other comprehensive loss (0.6) 0.1 1.0 0.5 Net current-period other comprehensive income (loss) 2.7 (70.7) 3.9 (64.1) Balance as of December 31, 2020 $ 6.0 $ (147.9) $ (14.8) $ (156.7) Other comprehensive income (loss) before reclassifications (3.5) 25.3 6.6 28.4 Amounts reclassified from accumulated other comprehensive loss (0.4) 0.1 1.8 1.5 Net current-period other comprehensive income (loss) (3.9) 25.4 8.4 29.9 Balance as of December 31, 2021 $ 2.1 $ (122.5) $ (6.4) $ (126.8) Other comprehensive income (loss) before reclassifications (13.7) 109.7 (8.9) 87.1 Amounts reclassified from accumulated other comprehensive loss 0.4 0.2 2.0 2.6 Net current-period other comprehensive income (loss) (13.3) 109.9 (6.9) 89.7 Balance as of December 31, 2022 $ (11.2) $ (12.6) $ (13.3) $ (37.1) (1) All amounts are net of tax. Amounts in parentheses indicate debits.

Segments Of Business (Tables)

Segments Of Business (Tables)	12 Months Ended
	Dec. 31, 2022
Segment Reporting [Abstract]
Schedule Of Operating Income Derived From Revenues And Expenses By Segment	Year Ended December 31, (in millions) 2022 2021 2020 Operating Revenues Gas Distribution Operations Unaffiliated $ 4,007.2 $ 3,171.2 $ 3,128.1 Intersegment 12.6 12.3 12.1 Total 4,019.8 3,183.5 3,140.2 Electric Operations Unaffiliated 1,830.9 1,696.3 1,535.9 Intersegment 0.8 0.8 0.7 Total 1,831.7 1,697.1 1,536.6 Corporate and Other Unaffiliated 12.5 32.1 17.7 Intersegment 465.0 460.3 449.8 Total 477.5 492.4 467.5 Eliminations (478.4) (473.4) (462.6) Consolidated Operating Revenues $ 5,850.6 $ 4,899.6 $ 4,681.7 Year Ended December 31, (in millions) 2022 2021 2020 Operating Income (Loss) Gas Distribution Operations (1) $ 915.8 $ 617.5 $ 199.1 Electric Operations 362.4 387.8 348.8 Corporate and Other (12.4) 1.6 2.9 Consolidated Operating Income $ 1,265.8 $ 1,006.9 $ 550.8 Depreciation and Amortization Gas Distribution Operations $ 415.9 $ 383.0 $ 363.1 Electric Operations 362.9 329.4 321.3 Corporate and Other 42.0 36.0 41.5 Consolidated Depreciation and Amortization $ 820.8 $ 748.4 $ 725.9 Assets Gas Distribution Operations $ 16,986.5 $ 15,153.7 $ 13,433.0 Electric Operations 7,992.6 7,178.9 6,443.1 Corporate and Other 1,757.5 1,824.3 2,164.4 Consolidated Assets $ 26,736.6 $ 24,156.9 $ 22,040.5 Capital Expenditures (2) Gas Distribution Operations $ 1,682.3 $ 1,406.4 $ 1,266.9 Electric Operations 574.5 517.4 422.8 Corporate and Other 41.2 16.6 31.1 Consolidated Capital Expenditures $ 2,298.0 $ 1,940.4 $ 1,720.8 (1) In 2020, Gas Distribution Operations reflects the loss of $412.4 million on the sale of the Massachusetts Business. (2) Amounts differ from those presented on the Statements of Consolidated Cash Flows primarily due to the inclusion of capital expenditures in current liabilities, the capitalized portion of the Corporate Incentive Plan payout, and AFUDC Equity.

Other, Net (Tables)

Other, Net (Tables)	12 Months Ended
	Dec. 31, 2022
Other Nonoperating Income (Expense) [Abstract]
Schedule Of Other, Net	The following table displays the components of Other, Net included on the Statements of Consolidated Income (Loss): Year Ended December 31, (in millions) 2022 2021 2020 Interest income $ 4.3 $ 4.0 $ 5.5 AFUDC equity 15.1 13.1 9.9 Charitable contributions (4.4) (11.5) (1.5) Pension and other postretirement non-service cost (1) 27.6 35.5 9.3 Sale of emission reduction credits — — 4.6 Interest rate swap settlement gain (2) 10.0 — — Miscellaneous (0.4) (0.3) 4.3 Total Other, net $ 52.2 $ 40.8 $ 32.1 (1) See Note 12, "Pension and Other Postemployment Benefits," for additional information. (2) See Note 10, "Risk Management Activities," for additional information.

Interest Expense, Net (Tables)

Interest Expense, Net (Tables)	12 Months Ended
	Dec. 31, 2022
Interest Expense [Abstract]
Schedule Of Interest Expense, Net	Year Ended December 31, (in millions) 2022 2021 2020 Interest on long-term debt $ 344.5 $ 336.4 $ 354.2 Interest on short-term borrowings 22.7 0.6 14.7 Debt discount/cost amortization 11.7 11.0 9.1 Accounts receivable securitization fees 2.5 1.4 2.6 Allowance for borrowed funds used and interest capitalized during construction (6.7) (4.6) (7.0) Debt-based post-in-service carrying charges (21.1) (14.7) (14.6) Other 8.0 11.0 11.7 Total Interest Expense, net $ 361.6 $ 341.1 $ 370.7

Supplemental Cash Flow Inform_2

Supplemental Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2022
Supplemental Cash Flow Information [Abstract]
Schedule of Cash Flow, Supplemental Disclosures	The following table provides additional information regarding our Consolidated Statements of Cash Flows for the years ended December 31, 2022, 2021 and 2020: Year Ended December 31, (in millions) 2022 2021 2020 Supplemental Disclosures of Cash Flow Information Non-cash transactions: Capital expenditures included in current liabilities $ 275.1 $ 245.7 $ 170.4 Assets acquired under a finance lease 19.3 22.4 59.3 Assets acquired under an operating lease 8.8 6.0 10.9 Reclassification of other property to regulatory assets (1) — 607.6 — Assets recorded for asset retirement obligations (2) 6.3 12.0 91.5 Obligation to developer at formation of JV (3) — 277.5 69.7 Purchase contract liability, net of fees and payments (4) 65.0 129.4 — Schedule of interest and income taxes paid: Cash paid for interest on long-term debt, net of interest capitalized amounts $ 343.8 $ 322.4 $ 349.0 Cash paid for interest on finance leases 8.5 9.4 11.1 Cash paid for income taxes, net of refunds (5) 7.2 5.4 (1.0) (1) See Note 9, "Regulatory Matters," for additional information. (2) See Note 8, "Asset Retirement Obligations," for additional information. (3) Represents investing non-cash activity. See Note 4, "Variable Interest Entities," for additional information. (4) Refer to Note 13, "Equity," for additional information. (5) Amount of refunds in 2020 was greater than the amount of tax payments due to overpayments in 2019.

Valuation and Qualifying Accoun

Valuation and Qualifying Accounts (Tables)	12 Months Ended
	Dec. 31, 2022
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Schedule of Valuation and Qualifying Accounts Disclosure	NISOURCE INC. SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS Twelve months ended December 31, 2022 Additions ($ in millions) Balance Jan. 1, 2022 Charged to Costs and Expenses Charged to Other Account (1) Deductions for Purposes for which Reserves were Created Balance Dec. 31, 2022 Reserves Deducted in Consolidated Balance Sheet from Assets to Which They Apply: Reserve for accounts receivable $ 23.5 $ 20.6 $ 36.4 $ 56.6 $ 23.9 Reserve for deferred charges and other 2.3 — (1.3) — 1.0 Twelve months ended December 31, 2021 Additions ($ in millions) Balance Jan. 1, 2021 Charged to Costs and Expenses Charged to Other Account (1) Deductions for Purposes for which Reserves were Created Balance Dec. 31, 2021 Reserves Deducted in Consolidated Balance Sheet from Assets to Which They Apply: Reserve for accounts receivable $ 52.3 $ 18.3 $ 6.4 $ 53.5 $ 23.5 Reserve for deferred charges and other — — 2.3 — 2.3 Twelve months ended December 31, 2020 Additions ($ in millions) Balance Charged to Costs and Expenses Charged to Other Account (1) Deductions for Purposes for which Reserves were Created Balance Reserves Deducted in Consolidated Balance Sheet from Assets to Which They Apply: Reserve for accounts receivable $ 19.2 $ 31.6 $ 33.0 $ 31.5 $ 52.3 Reserve for other investments 3.0 — — 3.0 — (1) Charged to Other Accounts reflects the deferral of bad debt expense to a regulatory asset or the movement of the reserve between short term and long term.

Nature of Operations And Summ_3

Nature of Operations And Summary of Significant Accounting Policies (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Basis Of Accounting Presentation [Line Items]
Number of customers	3,700,000
Other than Temporary Impairment Losses, Investments	$ 0	$ 0	$ 0
Pre-tax rate for allowance for funds used during construction	3.40%	3.30%	2.60%
Inventory valued using LIFO	$ 43	$ 44.9
Excess of replacement over LIFO value	7.7	13.6
Inventory valued using the weighted average cost methodology	$ 488.7	$ 282.4

Recent Accounting Pronounceme_2

Recent Accounting Pronouncements (Details)	12 Months Ended
	Dec. 31, 2022
Accounting Standards Update 2020-04
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2020-04
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Accounting Standards Update 2021-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2021-01
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Accounting Standards Update 2021-10
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2021-10
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true

Recently Adopted Pronouncements

Recently Adopted Pronouncements (Details)	12 Months Ended
	Dec. 31, 2022
Accounting Standards Update 2021-10
Recently Adopted Accounting Pronouncements [Line Items]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2021-10
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Accounting Standards Update 2020-04
Recently Adopted Accounting Pronouncements [Line Items]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2020-04
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Accounting Standards Update 2021-01
Recently Adopted Accounting Pronouncements [Line Items]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2021-01
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Accounting Standards Update 2022-04
Recently Adopted Accounting Pronouncements [Line Items]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2022-04
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true

Revenue Recognition (Disaggrega

Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Customer revenues	$ 5,738.6	$ 4,731.3	$ 4,473.2
Other revenues	112	168.3	208.5
Total Operating Revenues	5,850.6	4,899.6	4,681.7
Gas Distribution Operations
Disaggregation of Revenue [Line Items]
Customer revenues	4,003.1	3,126.1	3,032
Other revenues	4.1	45.1	96.1
Total Operating Revenues	4,007.2	3,171.2	3,128.1
Electric Operations
Disaggregation of Revenue [Line Items]
Customer revenues	1,735.5	1,604.4	1,440.4
Other revenues	95.4	91.9	95.5
Total Operating Revenues	1,830.9	1,696.3	1,535.9
Corporate and Other
Disaggregation of Revenue [Line Items]
Customer revenues	0	0.8	0.8
Other revenues	12.5	31.3	16.9
Total Operating Revenues	12.5	32.1	17.7
Residential
Disaggregation of Revenue [Line Items]
Customer revenues	3,202.1	2,677.3	2,602.8
Residential | Gas Distribution Operations
Disaggregation of Revenue [Line Items]
Customer revenues	2,609.7	2,109.4	2,075
Residential | Electric Operations
Disaggregation of Revenue [Line Items]
Customer revenues	592.4	567.9	527.8
Residential | Corporate and Other
Disaggregation of Revenue [Line Items]
Customer revenues	0	0	0
Commercial
Disaggregation of Revenue [Line Items]
Customer revenues	1,510.6	1,257.3	1,150.8
Commercial | Gas Distribution Operations
Disaggregation of Revenue [Line Items]
Customer revenues	939.6	722.4	670.5
Commercial | Electric Operations
Disaggregation of Revenue [Line Items]
Customer revenues	571	534.9	480.3
Commercial | Corporate and Other
Disaggregation of Revenue [Line Items]
Customer revenues	0	0	0
Industrial
Disaggregation of Revenue [Line Items]
Customer revenues	781.2	689.1	624.9
Industrial | Gas Distribution Operations
Disaggregation of Revenue [Line Items]
Customer revenues	220.6	195.7	212.8
Industrial | Electric Operations
Disaggregation of Revenue [Line Items]
Customer revenues	560.6	493.4	412.1
Industrial | Corporate and Other
Disaggregation of Revenue [Line Items]
Customer revenues	0	0	0
Off-system
Disaggregation of Revenue [Line Items]
Customer revenues	192.9	71.3	41
Off-system | Gas Distribution Operations
Disaggregation of Revenue [Line Items]
Customer revenues	192.9	71.3	41
Off-system | Electric Operations
Disaggregation of Revenue [Line Items]
Customer revenues	0	0	0
Off-system | Corporate and Other
Disaggregation of Revenue [Line Items]
Customer revenues	0	0	0
Miscellaneous
Disaggregation of Revenue [Line Items]
Customer revenues	51.8	36.3	53.7
Miscellaneous | Gas Distribution Operations
Disaggregation of Revenue [Line Items]
Customer revenues	40.3	27.3	32.7
Miscellaneous | Electric Operations
Disaggregation of Revenue [Line Items]
Customer revenues	11.5	8.2	20.2
Miscellaneous | Corporate and Other
Disaggregation of Revenue [Line Items]
Customer revenues	$ 0	$ 0.8	$ 0.8

Revenue Recognition (Customer A

Revenue Recognition (Customer Accounts Receivable) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Revenue Recognition [Abstract]
Customer Accounts Receivable, Billed (Less Reserve)	$ 560.5	$ 459.6
Customer Accounts Receivable, Unbilled (Less Reserve)	$ 453	$ 337

Revenue Recognition (Allowance

Revenue Recognition (Allowance for Credit Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Loss	$ 23.9	$ 23.5	$ 52.3
Current period provisions	36	7.2
Write-offs charged against allowance	(57.4)	(54.4)
Recoveries of amounts previously written off	21.8	18.4
Gas Distribution Operations
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Loss	17.2	18.9	41.8
Current period provisions	29.1	5.8
Write-offs charged against allowance	(52.1)	(46.7)
Recoveries of amounts previously written off	21.3	18
Electric Operations
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Loss	5.9	3.8	9.7
Current period provisions	6.9	1.4
Write-offs charged against allowance	(5.3)	(7.7)
Recoveries of amounts previously written off	0.5	0.4
Corporate and Other
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Loss	0.8	0.8	$ 0.8
Current period provisions	0	0
Write-offs charged against allowance	0	0
Recoveries of amounts previously written off	$ 0	$ 0

Variable Interest Entities (Nar

Variable Interest Entities (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) Rate MW	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Variable Interest Entity [Line Items]
Wind Power Purchase Agreement, Purchase Percentage | Rate	100%
Payment to renewable generation asset developer | $	$ 323.9	$ 240.4	$ 85.3
Rosewater
Variable Interest Entity [Line Items]
Nameplate Capacity	102
Indiana Crossroads Wind
Variable Interest Entity [Line Items]
Nameplate Capacity	302
Indiana Crossroads Solar
Variable Interest Entity [Line Items]
Nameplate Capacity	200

Variable Interest Entities (Sch

Variable Interest Entities (Schedule of Noncontrolling Interest) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Redeemable Noncontrolling Interest [Line Items]
Noncontrolling interest in consolidated subsidiaries	$ 326.4	$ 325.6

Variable Interest Entities (S_2

Variable Interest Entities (Schedule of Net Income Attributable to Noncontrolling Interest) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Attributable to noncontrolling [Line Items]
Net income (loss) attributable to noncontrolling interest	$ (12.3)	$ 3.9	$ 3.4

Variable Interest Entities (S_3

Variable Interest Entities (Schedule of Cash Contributions) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash Contributions Noncontrolling Interest [Line Items]
Obligation to the Developer	$ 0	$ 277.5	$ 69.7
Consolidated Variable Interest Entities
Cash Contributions Noncontrolling Interest [Line Items]
NIPSCO Cash Contributions	151.8	2.8	0.7
Tax Equity Partners Cash Contribution	21.2	245.1	86.1
Obligation to the Developer	0	277.5	69.7
Total Cash Contributions	$ 173	$ 525.4	$ 156.5

Variable Interest Entities (S_4

Variable Interest Entities (Schedule of VIE Assets and Liabilities) (Details) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
VIE Assets and Liabilities [Abstract]
Net Property, Plant and Equipment		$ 19,842.6	$ 17,881.8
Current assets	[1]	2,584.3	1,920.8
Total Assets		26,736.6	24,156.9	$ 22,040.5
Current liabilities		4,660.5	2,746.2
Asset retirement obligations		478.1	469.7
Other noncurrent liabilities		296.8	690.2
Consolidated Variable Interest Entities
VIE Assets and Liabilities [Abstract]
Net Property, Plant and Equipment		978.5	695.9
Current assets		25.7	14.3
Total Assets		1,004.2	710.2
Current liabilities		128.2	10
Asset retirement obligations		30.6	20.5
Total liabilities		$ 158.8	$ 30.5
[1] (1) Includes $978.5 million and $695.9 million in 2022 and 2021, respectively, of net property, plant and equipment assets and $25.7 million and $14.3 million in 2022 and 2021, 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.

Earnings Per Share (Narrative)

Earnings Per Share (Narrative) (Details)	Apr. 19, 2021 $ / shares
Equity Units [Member]
Earnings Per Share [Line Items]
Shares Issued, Price Per Share	$ 24.51

Earnings Per Share (Schedule of

Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Net Income (Loss) Available to Common Shareholders - Basic	$ 749	$ 529.8	$ (72.7)
Dilutive effect of Equity Units	2	1.6	0
Net Income (Loss) Available to Common Shareholders - Diluted	$ 751	$ 531.4	$ (72.7)
Average common shares outstanding - Basic	407,100	393,600	384,300
Equity Units purchase contracts	30,200	22,000	0
Incremental Common Shares Attributable to Dilutive Effect of Equity Unit Purchase Agreements	3,200	0	0
Shares contingently issuable under employee stock plans	900	800	0
Shares restricted under employee stock plans	500	300	0
ATM Forward agreements	800	600	0
Average Common Shares - Diluted	442,700	417,300	384,300
Basic Earnings (Loss) Per Share	$ 1.84	$ 1.35	$ (0.19)
Diluted Earnings (Loss) Per Share	$ 1.70	$ 1.27	$ (0.19)

Property, Plant and Equipment_2

Property, Plant and Equipment (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Depreciation	$ 685	$ 672.1	$ 655.6
Regulatory Deferral - Joint Venture	11	5.3
Capitalized Computer Software, Amortization	53.1	49.4	56.7
Capitalized Computer Software, Gross	190.1	181.8
Capitalized Cloud Computing, Amortization	11.1	10	$ 3.4
Capitalized Cloud Computing, Gross	45.7	$ 42.4
Units 14 and 15
Property, Plant and Equipment [Line Items]
Plant and Equipment Associated with Schahfer Generating Station Retirement	$ 600

Property, Plant And Equipment_3

Property, Plant And Equipment (Schedule Of Property, Plant And Equipment) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property Plant and Equipment	$ 27,551.3	$ 25,171.3
Accumulated Depreciation and Amortization	(7,708.7)	(7,289.5)
Net Property, Plant and Equipment	19,842.6	17,881.8
Gas Distribution Utility
Property, Plant and Equipment [Line Items]
Property Plant and Equipment	16,576.4	15,240.6
Accumulated Depreciation and Amortization	(3,678.1)	(3,490.2)
Electric Utility
Property, Plant and Equipment [Line Items]
Property Plant and Equipment	7,162.4	6,754.9
Accumulated Depreciation and Amortization	(2,557.4)	(2,433.1)
Common Utility
Property, Plant and Equipment [Line Items]
Property Plant and Equipment	271.7	217.8
Accumulated Depreciation and Amortization	(160)	(132.2)
Construction Work In Process
Property, Plant and Equipment [Line Items]
Property Plant and Equipment	1,398.2	808
Renewable Generation Assets
Property, Plant and Equipment [Line Items]
Property Plant and Equipment	702.2	702.4
Accumulated Depreciation and Amortization	(29.7)	(6.5)
Non-Utility And Other
Property, Plant and Equipment [Line Items]
Property Plant and Equipment	1,440.4	1,447.6
Accumulated Depreciation and Amortization	$ (1,283.5)	$ (1,227.5)

Property, Plant And Equipment P

Property, Plant And Equipment Property, Plant and Equipment (Schedule of Depreciation Provisions For Utility Plant as a Percentage of the Original Cost) (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Electric Operations
Property, Plant and Equipment [Line Items]
Depreciation Provisions For Utility Plant Percentage	3.10%	3.40%	3.40%
Gas Distribution Operations
Property, Plant and Equipment [Line Items]
Depreciation Provisions For Utility Plant Percentage	2.30%	2.20%	2.30%

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 1,485.9	$ 1,485.9
Gas Distribution Operations
Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 1,485.9	$ 1,485.9

Asset Retirement Obligations (C

Asset Retirement Obligations (Changes In Company's Liability For Asset Retirement Obligations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Beginning Balance	$ 469.7
Accretion recorded as a regulatory asset	17.1	$ 16
Additions	9.5	23.2
Settlements	(22.3)	(11.2)
Change in estimated cash flows	(3.2)	(11.2)
Asset Retirement Obligation	513.5	512.4	$ 495.6
Ending Balance	$ 478.1	$ 469.7

Regulatory Matters (Narrative)

Regulatory Matters (Narrative) (Details) - USD ($) $ in Millions		12 Months Ended
	Oct. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Regulatory Assets and Liabilities Disclosure [Line Items]
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided		$ 1,324.7	$ 1,207
Remaining Recovery Period of Regulatory Assets for which No Return on Investment During Recovery Period is Provided		50 years
Columbia of Maryland COVID Relief Funds		$ 0.8
COVID-19 related regulatory asset		2,580.8	2,492.2
Regulatory Liabilities		2,012.6	1,980
Overrecovered Gas And Fuel Costs
Regulatory Assets and Liabilities Disclosure [Line Items]
Regulatory Liabilities		20.6	$ 5.4
Columbia Of Ohio
Regulatory Assets and Liabilities Disclosure [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	$ 68.2	$ 221.4
Public Utilities, Requested Rate Increase (Decrease), Percentage	7.97%	21.30%
NIPSCO - Electric | Overrecovered Gas And Fuel Costs
Regulatory Assets and Liabilities Disclosure [Line Items]
Regulatory Liabilities		$ 8

Regulatory Matters (Regulatory

Regulatory Matters (Regulatory Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Regulated Operations [Line Items]
Total Assets	$ 2,580.8	$ 2,492.2
Regulatory Assets, Current	233.2	206.2
Regulatory Assets, Noncurrent	$ 2,347.6	2,286
Remaining Recovery Period of Regulatory Assets for which No Return on Investment During Recovery Period is Provided	50 years
Unrecognized Pension Benefit And Other Postretirement Benefit Costs
Regulated Operations [Line Items]
Total Assets	$ 607.5	512.1
Other Postretirement Costs
Regulated Operations [Line Items]
Total Assets	72.2	74.8
Environmental Costs
Regulated Operations [Line Items]
Total Assets	41.4	45.8
Regulatory Effects Of Accounting For Income Taxes
Regulated Operations [Line Items]
Total Assets	158	194.8
Underrecovered Gas And Fuel Costs
Regulated Operations [Line Items]
Total Assets	85.5	73.6
Depreciation
Regulated Operations [Line Items]
Total Assets	191.3	177.5
Post-In Service Carrying Charges
Regulated Operations [Line Items]
Total Assets	251.5	237.9
Safety Activity Costs
Regulated Operations [Line Items]
Total Assets	200.7	171.9
DSM Program
Regulated Operations [Line Items]
Total Assets	37.5	39.2
Retired coal generating stations
Regulated Operations [Line Items]
Total Assets	744	803.9
Deferred Derivative Gain (Loss)
Regulated Operations [Line Items]
Total Assets	10	9.6
Deferred Property Taxes
Regulated Operations [Line Items]
Total Assets	68.5	65.1
Renewable Energy Program
Regulated Operations [Line Items]
Total Assets	37.7	18.5
Other Assets
Regulated Operations [Line Items]
Total Assets	$ 75	$ 67.5

Regulatory Matters (Regulator_2

Regulatory Matters (Regulatory Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Regulated Operations [Line Items]
Regulatory Liabilities	$ 2,012.6	$ 1,980
Regulatory Liability, Current	236.8	137.4
Regulatory Liability, Noncurrent	1,775.8	1,842.6
Deferred Derivative Gain (Loss)
Regulated Operations [Line Items]
Regulatory Liabilities	90	34.2
Customer Assistance Programs
Regulated Operations [Line Items]
Regulatory Liabilities	32.9	13.2
Rate Refunds
Regulated Operations [Line Items]
Regulatory Liabilities	51.4	8.2
Overrecovered Gas And Fuel Costs
Regulated Operations [Line Items]
Regulatory Liabilities	20.6	5.4
Cost Of Removal
Regulated Operations [Line Items]
Regulatory Liabilities	675.9	749.5
Regulatory Effects Of Accounting For Income Taxes
Regulated Operations [Line Items]
Regulatory Liabilities	996.3	1,040.8
Other Postretirement Costs
Regulated Operations [Line Items]
Regulatory Liabilities	66.8	75.9
Other Liabilities
Regulated Operations [Line Items]
Regulatory Liabilities	$ 78.7	$ 52.8

Regulatory Matters (Schedule of

Regulatory Matters (Schedule of COVID-19 Regulatory Impact) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Regulatory Matters COVID [Line Items]
COVID-19 related regulatory asset	$ 2,580.8	$ 2,492.2
Incremental O&M and Bad Debt-COVID | Columbia Of Pennsylvania
Regulatory Matters COVID [Line Items]
COVID-19 related regulatory asset	2.8	5.2
Incremental Bad Debt - COVID | NIPSCO
Regulatory Matters COVID [Line Items]
COVID-19 related regulatory asset	2.1	2.2
Incremental Bad Debt - COVID | Columbia Of Virginia
Regulatory Matters COVID [Line Items]
COVID-19 related regulatory asset	1.9	1.5
Incremental Bad Debt - COVID | Columbia Of Maryland
Regulatory Matters COVID [Line Items]
COVID-19 related regulatory asset	1.3	0.9
Incremental O&M - COVID | Columbia Of Ohio
Regulatory Matters COVID [Line Items]
COVID-19 related regulatory asset	$ 0	$ 2.1

Risk Management Activities (Nar

Risk Management Activities (Narrative) (Details) mMDth in Millions, $ in Millions			12 Months Ended
	Dec. 21, 2022 USD ($)	Jun. 07, 2022 USD ($)	Dec. 31, 2022 USD ($) mMDth	Dec. 31, 2021 USD ($) mMDth	Dec. 31, 2020 USD ($)
Derivative [Line Items]
Limit of GCA Volumes			20%
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net			$ 0	$ 0	$ 0
Derivative Asset			84.8	24.4
Senior Notes			9,353	9,003
Derivative Asset, Subject to Master Netting Arrangement, after Offset			81.8	16.6
Derivative Gain Statement of Income or Comprehensive Extensible Enumeration Not Disclosed Flag	$ 10	$ 10.2
Other Current Assets
Derivative [Line Items]
Derivative Asset			$ 18.8	$ 10.6
Senior Notes | NiSource
Derivative [Line Items]
Senior Notes		$ 350
Debt, Weighted Average Interest Rate		5%
Minimum
Derivative [Line Items]
Commodity Contract Length			1 year
Maximum
Derivative [Line Items]
Commodity Contract Length			5 years
Interest Rate Swap
Derivative [Line Items]
Derivative, Notional Amount	$ 250	$ 250
Natural Gas
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | mMDth			99	124.5

Risk Management Activities (Sch

Risk Management Activities (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Derivative Asset	$ 84.8	$ 24.4
Derivative Liability	3	144.2
Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	18.8	10.6
Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	1.1	136.8
Other Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	66	13.8
Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	1.9	7.4
Interest rate risk programs | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	0	0
Interest rate risk programs | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	0	136.4
Interest rate risk programs | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	0	0
Interest rate risk programs | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	0	0
Commodity price risk programs | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	18.8	10.6
Commodity price risk programs | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	1.1	0.4
Commodity price risk programs | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	66	13.8
Commodity price risk programs | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	$ 1.9	$ 7.4

Risk Management Activities (S_2

Risk Management Activities (Schedule of Cash Flow Hedges in AOCI) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net current-period other comprehensive income (loss)	$ 89.7	$ 29.9	$ (64.1)
Interest rate risk programs
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net current-period other comprehensive income (loss)	109.9
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	$ (0.3)
Maximum Length of Time Hedged in Interest Rate Cash Flow Hedge	353 months

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Taxes [Line Items]
Increase (Decrease) in Effective Tax Rate	0.50%	37.90%
Deferred Tax Assets, Operating Loss Carryforwards	$ 491	$ 545.9
Deferred Tax Assets, Valuation Allowance	7.8	7.8
Unrecognized Tax Benefits, Income Tax Penalties Expense	0	0	$ 0
Unrecognized Tax Benefits, Income Tax Penalties Accrued	$ 0	$ 0
Effective Income Tax Rate Reconciliation, Tax Accrual Adjustments, Percent	0%	0%	(28.40%)
Book income (loss) before income taxes	$ 956.4	$ 706.6	$ (31.3)
Tax expense (benefit) at statutory federal income tax rate, value	$ 200.8	$ 148.3	$ (6.6)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21%	21%	21%
State income taxes, net of federal income tax benefit, value	$ 4.5	$ 14.1	$ (11.7)
State income taxes, net of federal income tax benefit, rate	0.50%	2%	37.40%
Amortization of regulatory liabilities, value	$ (38.5)	$ (39.1)	$ (38.4)
Amortization of regulatory liabilities, rate	(4.00%)	(5.50%)	122.70%
Fines and penalties, value	$ 0.3	$ 0	$ 11.8
Fines and penalties, rate	0%	0%	(37.70%)
Effective Income Tax Rate Reconciliation, Deduction, Employee Stock Ownership Plan Dividend, Amount	$ (1.2)	$ (1.2)	$ (1.3)
Employee stock ownership plan dividends and other compensation, rate	(0.10%)	(0.20%)	4.20%
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Amount	$ 0	$ 0	$ 23.3
State regulatory proceedings, rate	0%	0%	(74.50%)
Effective Income Tax Rate Reconciliation Tax Accrual Adjustments	$ 0.2	$ (0.1)	$ 8.9
Effective Income Tax Rate Reconciliation, Tax Credit, Amount	$ (2.3)	$ (2.1)	$ (2.5)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(0.20%)	(0.30%)	(8.00%)
Other adjustments, value	$ 0.8	$ (2.1)	$ (0.6)
Other adjustments, rate	0%	(0.30%)	1.90%
Income Taxes	$ 164.6	$ 117.8	$ (17.1)
Effective Income Tax Rate Reconciliation, Percent	17.20%	16.70%	54.60%
Massachusetts Business [Domain]
Income Taxes [Line Items]
Deferred Tax Assets, Valuation Allowance	$ 7.8
Internal Revenue Service (IRS)
Income Taxes [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	410
State and Local Jurisdiction
Income Taxes [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	$ 73.2

Income Taxes (Schedule Of Compo

Income Taxes (Schedule Of Components Of Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current
Federal	$ 0.4	$ (0.1)	$ 0.2
State	7.3	6	11.7
Total Current	7.7	5.9	11.9
Deferred
Federal	181	99.2	(0.4)
State	(23)	13.8	(27.4)
Total Deferred	158	113	(27.8)
Deferred Investment Credits	(1.1)	(1.1)	(1.2)
Income Taxes	$ 164.6	$ 117.8	$ (17.1)

Income Taxes (Schedule Of Reaso

Income Taxes (Schedule Of Reasons Behind Differences In Computation Of Total Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Reasons Behind Differences in Computation of Total Income Taxes [Line Items]
Book income (loss) before income taxes	$ 956.4	$ 706.6	$ (31.3)
Tax expense (benefit) at statutory federal income tax rate, value	$ 200.8	$ 148.3	$ (6.6)
Tax expense (benefit) at statutory federal income tax rate, rate	21%	21%	21%
Increases (reductions) in taxes resulting from:
State income taxes, net of federal income tax benefit, value	$ 4.5	$ 14.1	$ (11.7)
State income taxes, net of federal income tax benefit, rate	0.50%	2%	37.40%
Amortization of regulatory liabilities, value	$ (38.5)	$ (39.1)	$ (38.4)
Amortization of regulatory liabilities, rate	(4.00%)	(5.50%)	122.70%
Fines and penalties, value	$ 0.3	$ 0	$ 11.8
Fines and penalties, rate	0%	0%	(37.70%)
Employee stock ownership plan dividends and other compensation, value	$ (1.2)	$ (1.2)	$ (1.3)
Employee stock ownership plan dividends and other compensation, rate	(0.10%)	(0.20%)	4.20%
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Amount	$ 0	$ 0	$ 23.3
State regulatory proceedings, rate	0%	0%	(74.50%)
Effective Income Tax Rate Reconciliation Tax Accrual Adjustments	$ 0.2	$ (0.1)	$ 8.9
Effective Income Tax Rate Reconciliation, Tax Credit, Amount	$ (2.3)	$ (2.1)	$ (2.5)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(0.20%)	(0.30%)	(8.00%)
Other adjustments, value	$ 0.8	$ (2.1)	$ (0.6)
Other adjustments, rate	0%	(0.30%)	1.90%
Income Taxes	$ 164.6	$ 117.8	$ (17.1)
Income Taxes, rate	17.20%	16.70%	54.60%

Income Taxes (Schedule Of Princ

Income Taxes (Schedule Of Principal Components Of Net Deferred Tax Liability) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Deferred Tax Liabilities
Accelerated depreciation and other property differences	$ 2,527.9	$ 2,454.4
Other regulatory assets	348.4	308.6
Total Deferred Tax Liabilities	2,876.3	2,763
Deferred Tax Assets
Other regulatory liabilities and deferred investment tax credits (including TCJA)	294.3	284.7
Pension and other postretirement/postemployment benefits	124.7	104.8
Net operating loss carryforward and AMT credit carryforward	491	545.9
Environmental liabilities	20.7	22.2
Other accrued liabilities	55.9	42.1
Other, net	43	111.7
Total Deferred Tax Assets	1,029.6	1,111.4
Deferred Tax Assets, Valuation Allowance	(7.8)	(7.8)
Deferred Tax Assets, Net of Valuation Allowance	1,021.8	1,103.6
Net Deferred Tax Liabilities	$ 1,854.5	$ 1,659.4

Income Taxes (Schedule of Unrec

Income Taxes (Schedule of Unrecognized Tax Benefits Roll Forward) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits - Opening Balance	$ 21.7	$ 21.7	$ 23.2
Gross decreases - tax positions in prior period	0	0	(1.5)
Gross increases - current period tax positions	0	0	0
Unrecognized Tax Benefits - Ending Balance	21.7	21.7	21.7
Offset for net operating loss carryforwards	(21.7)	(21.7)	(21.7)
Balance - Less Net Operating Loss Carryforwards	$ 0	$ 0	$ 0

Pension and Other Postretirem_3

Pension and Other Postretirement Benefits (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
COVID-19 related regulatory asset	$ 2,580.8	$ 2,492.2
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation	1,416.8	1,834.4
Funded status of plan	4.6	(129.3)
Employer contributions	2.7	4
Settlement loss	12.4	11.4	$ 10.5
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement	5.7	$ 4
Expected contribution	$ 2.6
Expected return on plan assets	4.80%	5.20%	5.70%
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Funded status of plan	$ 224.1	$ 262.5
Employer contributions	21.3	19.8
Settlement loss	0	$ 0	$ 1.5
Expected contribution	$ 23.7
Expected return on plan assets	5.72%	5.50%	5.67%
Unrecognized Pension Benefit And Other Postretirement Benefit Costs
Defined Benefit Plan Disclosure [Line Items]
COVID-19 related regulatory asset	$ 607.5	$ 512.1

Pension and Other Postretirem_4

Pension and Other Postretirement Benefits (Schedule Of Portfolio Asset Mix) (Details)	Dec. 31, 2022	Dec. 31, 2021
Minimum | Domestic Equities | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	7%	7%
Minimum | Domestic Equities | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0%	0%
Minimum | International Equities | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	3%	3%
Minimum | International Equities | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0%	0%
Minimum | Fixed Income | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	69%
Minimum | Fixed Income | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	20%
Minimum | Real Estate [Member] | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0%
Minimum | Real Estate [Member] | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0%
Minimum | Real Estate | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		0%
Minimum | Real Estate | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		0%
Minimum | Short-Term Investments | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0%	0%
Minimum | Short-Term Investments | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0%	0%
Minimum | Private Equity | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0%	0%
Minimum | Private Equity | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0%	0%
Maximum | Domestic Equities | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	27%	27%
Maximum | Domestic Equities | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	55%	55%
Maximum | International Equities | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	13%	13%
Maximum | International Equities | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	25%	25%
Maximum | Fixed Income | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	81%
Maximum | Fixed Income | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	100%
Maximum | Real Estate [Member] | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	3%
Maximum | Real Estate [Member] | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0%
Maximum | Real Estate | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		3%
Maximum | Real Estate | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		0%
Maximum | Short-Term Investments | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	10%	10%
Maximum | Short-Term Investments | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	10%	10%
Maximum | Private Equity | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	3%	3%
Maximum | Private Equity | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0%	0%

Pension and Other Postretirem_5

Pension and Other Postretirement Benefits (Schedule of Plan Asset Mix Prior Year) (Details)	Dec. 31, 2022	Dec. 31, 2021
Pension Plan | Domestic Equities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	7%	7%
Pension Plan | Domestic Equities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	27%	27%
Pension Plan | International Equities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	3%	3%
Pension Plan | International Equities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	13%	13%
Pension Plan | Fixed Income | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		69%
Pension Plan | Fixed Income | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		81%
Pension Plan | Real Estate | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		0%
Pension Plan | Real Estate | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		3%
Pension Plan | Short-Term Investments | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0%	0%
Pension Plan | Short-Term Investments | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	10%	10%
Pension Plan | Private Equity | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0%	0%
Pension Plan | Private Equity | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	3%	3%
Other Postretirement Benefits | Domestic Equities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0%	0%
Other Postretirement Benefits | Domestic Equities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	55%	55%
Other Postretirement Benefits | International Equities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0%	0%
Other Postretirement Benefits | International Equities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	25%	25%
Other Postretirement Benefits | Fixed Income | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		20%
Other Postretirement Benefits | Fixed Income | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		100%
Other Postretirement Benefits | Real Estate | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		0%
Other Postretirement Benefits | Real Estate | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		0%
Other Postretirement Benefits | Short-Term Investments | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0%	0%
Other Postretirement Benefits | Short-Term Investments | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	10%	10%
Other Postretirement Benefits | Private Equity | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0%	0%
Other Postretirement Benefits | Private Equity | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0%	0%

Pension and Other Postretirem_6

Pension and Other Postretirement Benefits (Schedule Of Pension Plan And Postretirement Plan Asset Mix) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 1,647.7	$ 2,275.4
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Percentage of total asset	100%	100%
Pension Plan | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 1,422.8	$ 1,981.7	$ 2,117.7
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Percentage of total asset	100%	100%
Other Postretirement Benefits | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 224.9	$ 293.7	$ 286.4
Domestic Equities | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 231.1	$ 324.3
Percentage of total asset	16.20%	16.40%
Domestic Equities | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 86.9	$ 118.6
Percentage of total asset	38.60%	40.40%
International Equities | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 119	$ 150.9
Percentage of total asset	8.40%	7.60%
International Equities | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 36.6	$ 50.5
Percentage of total asset	16.30%	17.20%
Fixed Income | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 1,004.3	$ 1,382.3
Percentage of total asset	70.60%	69.70%
Fixed Income | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 94.7	$ 118.8
Percentage of total asset	42.10%	40.40%
Real Estate | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 5	$ 37.2
Percentage of total asset	0.30%	1.90%
Real Estate | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 0	$ 0
Percentage of total asset	0%	0%
Cash/Other [Member] | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 63.4	$ 87
Percentage of total asset	4.50%	4.40%
Cash/Other [Member] | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 6.7	$ 5.8
Percentage of total asset	3%	2%
Commingled Funds | Short-Term Money Markets | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 46.2	$ 55
Commingled Funds | Short-Term Money Markets | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	17.4	5.8
Commingled Funds | International Equities | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	89.6	111.7
Commingled Funds | International Equities | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	20.3	26.1
Commingled Funds | Fixed Income | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	275.9	349.1
Commingled Funds | United States Equities | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	133.7	195.9
Commingled Funds | United States Equities | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 10.7	$ 14.8

Pension and Other Postretirem_7

Pension and Other Postretirement Benefits (Schedule Of Fair Value Of Pension Plan Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		$ 432
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 326
Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	714.2	1,032.3
Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1,647.7	2,275.4
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Fair Value Of Plan Assets Before Pending Items	1,417	1,975.5
Pension Plan | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Fair Value Of Plan Assets Before Pending Items		177.3
Pension Plan | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Fair Value Of Plan Assets Before Pending Items	131
Pension Plan | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Fair Value Of Plan Assets Before Pending Items	726.9	1,033.8
Pension Plan | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Fair Value Of Plan Assets Before Pending Items	0	0
Pension Plan | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1,422.8	1,981.7	$ 2,117.7
Pension Plan | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2.5	10.3
Pension Plan | Cash [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		9.7
Pension Plan | Cash [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2
Pension Plan | Cash [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0.5	0.6
Pension Plan | Cash [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Pension Plan | International Equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	119	150.9
Pension Plan | Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1,004.3	1,382.3
Pension Plan | Equity Securities [Member] | International Equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0.5
Pension Plan | Equity Securities [Member] | International Equities | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0.5
Pension Plan | Equity Securities [Member] | International Equities | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Pension Plan | Equity Securities [Member] | International Equities | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Pension Plan | Equity Securities [Member] | United States Equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0.5
Pension Plan | Equity Securities [Member] | United States Equities | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0.5
Pension Plan | Equity Securities [Member] | United States Equities | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0
Pension Plan | Equity Securities [Member] | United States Equities | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0
Pension Plan | Fixed Income | Government
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	316.3	387.3
Pension Plan | Fixed Income | Government | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0
Pension Plan | Fixed Income | Government | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Pension Plan | Fixed Income | Government | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	316.3	387.3
Pension Plan | Fixed Income | Government | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Pension Plan | Fixed Income | Corporate/Other debt securities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	407.8	645.9
Pension Plan | Fixed Income | Corporate/Other debt securities | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0
Pension Plan | Fixed Income | Corporate/Other debt securities | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Pension Plan | Fixed Income | Corporate/Other debt securities | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	407.8	645.9
Pension Plan | Fixed Income | Corporate/Other debt securities | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Pension Plan | Fixed Income | Mortgages/ Asset backed securities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2.3
Pension Plan | Fixed Income | Mortgages/ Asset backed securities | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Pension Plan | Fixed Income | Mortgages/ Asset backed securities | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2.3
Pension Plan | Fixed Income | Mortgages/ Asset backed securities | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Pension Plan | Fixed Income | Other Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1.9
Pension Plan | Fixed Income | Other Fixed Income | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1.9
Pension Plan | Fixed Income | Other Fixed Income | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Pension Plan | Fixed Income | Other Fixed Income | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Pension Plan | Commingled Funds | International Equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	89.6	111.7
Pension Plan | Commingled Funds | International Equities | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0
Pension Plan | Commingled Funds | International Equities | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Pension Plan | Commingled Funds | International Equities | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Pension Plan | Commingled Funds | International Equities | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Pension Plan | Commingled Funds | Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	275.9	349.1
Pension Plan | Commingled Funds | Fixed Income | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0
Pension Plan | Commingled Funds | Fixed Income | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Pension Plan | Commingled Funds | Fixed Income | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Pension Plan | Commingled Funds | Fixed Income | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Pension Plan | Commingled Funds | United States Equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	133.7	195.9
Pension Plan | Commingled Funds | United States Equities | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0
Pension Plan | Commingled Funds | United States Equities | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Pension Plan | Commingled Funds | United States Equities | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Pension Plan | Commingled Funds | United States Equities | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Pension Plan | Commingled Funds | Short-Term Money Markets
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	46.2	55
Pension Plan | Commingled Funds | Short-Term Money Markets | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0
Pension Plan | Commingled Funds | Short-Term Money Markets | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Pension Plan | Commingled Funds | Short-Term Money Markets | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Pension Plan | Commingled Funds | Short-Term Money Markets | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Pension Plan | Private Equity Limited Partnerships [Member] | U.S. Multi-Strategy [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	6.3	10.9
Pension Plan | Private Equity Limited Partnerships [Member] | U.S. Multi-Strategy [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0
Pension Plan | Private Equity Limited Partnerships [Member] | U.S. Multi-Strategy [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Pension Plan | Private Equity Limited Partnerships [Member] | U.S. Multi-Strategy [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Pension Plan | Private Equity Limited Partnerships [Member] | U.S. Multi-Strategy [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Pension Plan | Private Equity Limited Partnerships [Member] | International Multi-Strategy [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2.3	4.5
Pension Plan | Private Equity Limited Partnerships [Member] | International Multi-Strategy [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0
Pension Plan | Private Equity Limited Partnerships [Member] | International Multi-Strategy [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Pension Plan | Private Equity Limited Partnerships [Member] | International Multi-Strategy [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Pension Plan | Private Equity Limited Partnerships [Member] | International Multi-Strategy [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Pension Plan | Private Equity Limited Partnerships [Member] | Distressed Opportunities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0.1	0.1
Pension Plan | Private Equity Limited Partnerships [Member] | Distressed Opportunities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0
Pension Plan | Private Equity Limited Partnerships [Member] | Distressed Opportunities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Pension Plan | Private Equity Limited Partnerships [Member] | Distressed Opportunities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Pension Plan | Private Equity Limited Partnerships [Member] | Distressed Opportunities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Pension Plan | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	5	37.2
Pension Plan | Real Estate [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0
Pension Plan | Real Estate [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Pension Plan | Real Estate [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Pension Plan | Real Estate [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Pension Plan | Mutual Funds [Member] | International Equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	29	38.7
Pension Plan | Mutual Funds [Member] | International Equities | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		38.7
Pension Plan | Mutual Funds [Member] | International Equities | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	29
Pension Plan | Mutual Funds [Member] | International Equities | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Pension Plan | Mutual Funds [Member] | International Equities | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Pension Plan | Mutual Funds [Member] | U.S. Multi-Strategy [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	97.4	128.4
Pension Plan | Mutual Funds [Member] | U.S. Multi-Strategy [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		128.4
Pension Plan | Mutual Funds [Member] | U.S. Multi-Strategy [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	97.4
Pension Plan | Mutual Funds [Member] | U.S. Multi-Strategy [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Pension Plan | Mutual Funds [Member] | U.S. Multi-Strategy [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Pension Plan | Mutual Funds [Member] | Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0.2
Pension Plan | Mutual Funds [Member] | Fixed Income | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0.2
Pension Plan | Mutual Funds [Member] | Fixed Income | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Pension Plan | Mutual Funds [Member] | Fixed Income | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Fair Value Of Plan Assets Before Pending Items	235.6	293.4
Other Postretirement Benefits | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Fair Value Of Plan Assets Before Pending Items		246.7
Other Postretirement Benefits | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Fair Value Of Plan Assets Before Pending Items	187.2
Other Postretirement Benefits | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Fair Value Of Plan Assets Before Pending Items	0	0
Other Postretirement Benefits | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Fair Value Of Plan Assets Before Pending Items	0	0
Other Postretirement Benefits | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	224.9	293.7	$ 286.4
Other Postretirement Benefits | International Equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	36.6	50.5
Other Postretirement Benefits | Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	94.7	118.8
Other Postretirement Benefits | Due To Brokers Net [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	(2)	(1.8)
Other Postretirement Benefits | Due To Brokers Net [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0
Other Postretirement Benefits | Due To Brokers Net [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Other Postretirement Benefits | Due To Brokers Net [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	(2)	(1.8)
Other Postretirement Benefits | Due To Brokers Net [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Other Postretirement Benefits | Accrued Investment Income Dividends [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	7.8	8
Other Postretirement Benefits | Accrued Investment Income Dividends [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	7.8	8
Other Postretirement Benefits | Accrued Investment Income Dividends [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Other Postretirement Benefits | Accrued Investment Income Dividends [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Other Postretirement Benefits | Receivables/Payables
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	(10.7)	0.3
Other Postretirement Benefits | Receivables/Payables | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0
Other Postretirement Benefits | Receivables/Payables | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Other Postretirement Benefits | Receivables/Payables | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	(10.7)	0.3
Other Postretirement Benefits | Receivables/Payables | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Other Postretirement Benefits | Commingled Funds | International Equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	20.3	26.1
Other Postretirement Benefits | Commingled Funds | International Equities | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0
Other Postretirement Benefits | Commingled Funds | International Equities | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Other Postretirement Benefits | Commingled Funds | International Equities | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Other Postretirement Benefits | Commingled Funds | International Equities | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Other Postretirement Benefits | Commingled Funds | United States Equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	10.7	14.8
Other Postretirement Benefits | Commingled Funds | United States Equities | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0
Other Postretirement Benefits | Commingled Funds | United States Equities | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Other Postretirement Benefits | Commingled Funds | United States Equities | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Other Postretirement Benefits | Commingled Funds | United States Equities | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Other Postretirement Benefits | Commingled Funds | Short-Term Money Markets
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	17.4	5.8
Other Postretirement Benefits | Commingled Funds | Short-Term Money Markets | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0
Other Postretirement Benefits | Commingled Funds | Short-Term Money Markets | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Other Postretirement Benefits | Commingled Funds | Short-Term Money Markets | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Other Postretirement Benefits | Commingled Funds | Short-Term Money Markets | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Other Postretirement Benefits | Mutual Funds [Member] | International Equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	16.3	24.4
Other Postretirement Benefits | Mutual Funds [Member] | International Equities | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		24.4
Other Postretirement Benefits | Mutual Funds [Member] | International Equities | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	16.3
Other Postretirement Benefits | Mutual Funds [Member] | International Equities | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Other Postretirement Benefits | Mutual Funds [Member] | International Equities | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Other Postretirement Benefits | Mutual Funds [Member] | Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	94.7	118.5
Other Postretirement Benefits | Mutual Funds [Member] | Fixed Income | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		118.5
Other Postretirement Benefits | Mutual Funds [Member] | Fixed Income | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	94.7
Other Postretirement Benefits | Mutual Funds [Member] | Fixed Income | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Other Postretirement Benefits | Mutual Funds [Member] | Fixed Income | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Other Postretirement Benefits | Mutual Funds [Member] | United States Equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	76.2	103.8
Other Postretirement Benefits | Mutual Funds [Member] | United States Equities | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		103.8
Other Postretirement Benefits | Mutual Funds [Member] | United States Equities | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	76.2
Other Postretirement Benefits | Mutual Funds [Member] | United States Equities | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Other Postretirement Benefits | Mutual Funds [Member] | United States Equities | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Underfunded Plan [Member] | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 1,422.8	$ 1,981.7

Pension and Other Postretirem_8

Pension and Other Postretirement Benefits (Schedule of Net Asset Value Per Share) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Net Asset Value Excluded From Fair Value By Input	$ 607.5	$ 778.8
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	11.6	12.1
Private Equity and Real Estate Limited Partnerships
Defined Benefit Plan Disclosure [Line Items]
Net Asset Value Excluded From Fair Value By Input	13.7	20.4
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	11.6	12.1
Commingled Funds | Short-Term Money Markets
Defined Benefit Plan Disclosure [Line Items]
Net Asset Value Excluded From Fair Value By Input	63.6	60.8
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	$ 0	$ 0
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Frequency	Daily	Daily
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period	1 day	1 day
Commingled Funds | United States Equities
Defined Benefit Plan Disclosure [Line Items]
Net Asset Value Excluded From Fair Value By Input	$ 144.4	$ 210.7
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	$ 0	$ 0
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Frequency	Daily	Daily
Commingled Funds | United States Equities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period	5 days	5 days
Commingled Funds | United States Equities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period	1 day	1 day
Commingled Funds | International Equities
Defined Benefit Plan Disclosure [Line Items]
Net Asset Value Excluded From Fair Value By Input	$ 109.9	$ 137.8
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	$ 0	$ 0
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Frequency	Monthly	Monthly
Commingled Funds | International Equities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period	30 days	30 days
Commingled Funds | International Equities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period	10 days	10 days
Commingled Funds | Fixed Income Funds
Defined Benefit Plan Disclosure [Line Items]
Net Asset Value Excluded From Fair Value By Input	$ 275.9	$ 349.1
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	$ 0	$ 0
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Frequency	Daily	Daily
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period	3 days	3 days

Pension and Other Postretirem_9

Pension and Other Postretirement Benefits (Schedule Of Reconciliation Of The Plans Funded Status And Amounts Reflected) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liabilities	$ (223.1)	$ (261.5)
COVID-19 related regulatory asset	2,580.8	2,492.2
Regulatory Liabilities	2,012.6	1,980
Unrecognized Pension Benefit And Other Postretirement Benefit Costs
Defined Benefit Plan Disclosure [Line Items]
Regulatory Liabilities	0	0
Unrecognized Pension Benefit And Other Postretirement Benefit Costs
Defined Benefit Plan Disclosure [Line Items]
COVID-19 related regulatory asset	607.5	512.1
Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	2,275.4
Fair value of plan assets at end of year	1,647.7	2,275.4
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	1,852.4	2,058.4
Service cost	27.8	30.2	$ 32
Interest cost	40.5	31.4	51.6
Plan participants' contributions	0	0
Plan amendments	0.2	0
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(318.7)	(68.7)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	174.8	198.9
Estimated benefits paid by incurred subsidy	0	0
Projected benefit obligation at end of year	1,427.4	1,852.4	2,058.4
Actual return on plan assets	(386.8)	58.9
Employer contributions	2.7	4
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant	0	0
Benefits paid	(174.8)	(198.9)
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(4.6)	129.3
Noncurrent assets	18.3	159.3
Current liabilities	(2.6)	(2.8)
Noncurrent liabilities	(20.3)	(27.2)
Net amount recognized at end of year	(4.6)	129.3
Unrecognized prior service cost	0.4	0.3
Unrecognized actuarial loss	564.2	438
Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Or Regulatory Asset Or Liability	564.6	438.3
Pension Plan | Underfunded Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	1,822.4
Projected benefit obligation at end of year	1,404.5	1,822.4
Fair value of plan assets at beginning of year	1,981.7
Fair value of plan assets at end of year	1,422.8	1,981.7
Defined Benefit Plan, Funded (Unfunded) Status of Plan	18.3	159.3
Pension Plan | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	1,981.7	2,117.7
Fair value of plan assets at end of year	1,422.8	1,981.7	2,117.7
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	556.2	590.8
Service cost	6.5	6.2	6.6
Interest cost	12	9.9	15.4
Plan participants' contributions	4.1	4.2
Plan amendments	2.1	0.1
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(89.9)	(14.8)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	42.3	40.6
Estimated benefits paid by incurred subsidy	0.3	0.4
Projected benefit obligation at end of year	449	556.2	590.8
Actual return on plan assets	(51.9)	23.9
Employer contributions	21.3	19.8
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant	4.1	4.2
Benefits paid	(42.3)	(40.6)
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(224.1)	(262.5)
Noncurrent assets	0	0
Current liabilities	(1)	(1)
Net amount recognized at end of year	(224.1)	(262.5)
Unrecognized prior service cost	(3.4)	(7.8)
Unrecognized actuarial loss	64	88.5
Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Or Regulatory Asset Or Liability	60.6	80.7
Other Postretirement Benefits | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	293.7	286.4
Fair value of plan assets at end of year	$ 224.9	$ 293.7	$ 286.4

Pension and Other Postretire_10

Pension and Other Postretirement Benefits (Schedule of Benefit Obligations in Excess of Fair Value) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation	$ 1,416.8	$ 1,834.4
Defined Benefit Plan, Benefit Obligation	1,427.4	1,852.4	$ 2,058.4
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(4.6)	129.3
Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Benefit Obligation	449	556.2	$ 590.8
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(224.1)	(262.5)
Underfunded Plan [Member] | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation	22.9	30
Defined Benefit Plan, Benefit Obligation	22.9	30
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(22.9)	(30)
Underfunded Plan [Member] | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation	1,393.8	1,804.3
Defined Benefit Plan, Benefit Obligation	1,404.5	1,822.4
Defined Benefit Plan, Plan Assets, Amount	1,422.8	1,981.7
Defined Benefit Plan, Funded (Unfunded) Status of Plan	$ 18.3	$ 159.3

Pension and Other Postretire_11

Pension and Other Postretirement Benefits (Schedule Of Significant Actuarial Assumptions In Determining Funded Status Plan) (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	5.14%	2.76%
Rate of Compensation Increases	4%	4%
Interest Crediting Rates	4%	4%
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	5.17%	2.85%
Trend for Next Year	6.69%	6.20%
Ultimate Trend	4.75%	4.50%
Year Ultimate Trend Reached	2032	2030

Pension and Other Postretire_12

Pension and Other Postretirement Benefits (Schedule Of Expected Payments To Participants In Pension Plan) (Details) $ in Millions	Dec. 31, 2022 USD ($)
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
2023	$ 150.5
2024	145.2
2025	141.2
2026	133.8
2027	128.1
2028-2032	563.2
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
2023	38.9
2024	38.5
2025	37.8
2026	36.9
2027	36.4
2028-2032	172
Postretirement Health Coverage [Member]
Defined Benefit Plan Disclosure [Line Items]
2023	0.4
2024	0.2
2025	0.2
2026	0.2
2027	0.2
2028-2032	$ 0.9

Pension and Other Postretire_13

Pension and Other Postretirement Benefits (Components Of The Plans' Net Periodic Benefits Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 27.8	$ 30.2	$ 32
Interest cost	40.5	31.4	51.6
Expected return on assets	(90.8)	(101.6)	(111.6)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0.1	0.1	0.7
Recognized actuarial loss	20.3	21.7	33.8
Settlement loss	12.4	11.4	10.5
Total Net Periodic Benefits Cost	10.3	(6.8)	17
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service Cost	6.5	6.2	6.6
Interest cost	12	9.9	15.4
Expected return on assets	(16.2)	(15.3)	(14.4)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(2.2)	(2.2)	(2.1)
Recognized actuarial loss	2.6	4.6	4.9
Settlement loss	0	0	1.5
Total Net Periodic Benefits Cost	$ 2.7	$ 3.2	$ 11.9

Pension and Other Postretire_14

Pension and Other Postretirement Benefits (Schedule Of Key Assumptions That Were Used To Calculate The Net Periodic Benefits Cost) (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Discount rate - service cost	3.08%	2.81%	3.39%
Discount rate - interest cost	2.11%	1.57%	2.65%
Expected Long-Term Rate of Return on Plan Assets	4.80%	5.20%	5.70%
Rate of Compensation Increases	4%	4%	4%
Interest Crediting Rates	4%	4%	4%
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate - service cost	3.21%	3%	3.52%
Discount rate - interest cost	2.24%	1.73%	2.76%
Expected Long-Term Rate of Return on Plan Assets	5.72%	5.50%	5.67%

Pension and Other Postretire_15

Pension and Other Postretirement Benefits (Schedule Of Changes In Plan Assets And Projected Benefit Obligations Recognized In Other Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Plan
Net prior service cost/(credit)	$ 0.2	$ 0
Net actuarial (gain)/loss	158.9	(26)
Settlements	(12.4)	(11.4)	$ (10.5)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(0.1)	(0.1)	(0.7)
Less: amortization of net actuarial (gain) loss	(20.3)	(21.7)	(33.8)
Total Recognized in Other Comprehensive Income or Regulatory Asset or Liability	126.3	(59.2)
Amount Recognized in Net Periodic Benefits Cost and Other Comprehensive Income or Regulatory Asset or Liability	136.6	(66)
Other Postretirement Benefits
Net prior service cost/(credit)	2.1	0.1
Net actuarial (gain)/loss	(21.8)	(23.3)
Settlements	0	0	(1.5)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	2.2	2.2	2.1
Less: amortization of net actuarial (gain) loss	(2.6)	(4.6)	$ (4.9)
Total Recognized in Other Comprehensive Income or Regulatory Asset or Liability	(20.1)	(25.6)
Amount Recognized in Net Periodic Benefits Cost and Other Comprehensive Income or Regulatory Asset or Liability	$ (17.4)	$ (22.4)

Equity (Narrative) (Details)

Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions

1 Months Ended

12 Months Ended

Jun. 11, 2018

Sep. 01, 2021

Dec. 31, 2018

Dec. 31, 2022

Dec. 31, 2021

Dec. 31, 2020

Jun. 15, 2023

Apr. 19, 2021

Feb. 22, 2021

Aug. 01, 2019

Dec. 05, 2018

Nov. 01, 2018

Forward Contract Indexed to Issuer's Equity [Line Items]

Common Stock Aggregate Sale Price

$ 750

$ 434.4

$ 500

Preferred Stock, Par or Stated Value Per Share

$ 0.01

$ 0.01

Net Process from Sale

$ 835.5

Equity Units Stock Purchase Contract Liability Payment

$ 66.8

$ 41.2

Purchase Contract Liability

$ 65

$ 129.4

$ 0

$ 168.8

Equity Units purchase contracts

30,200,000

22,000,000

0

Incremental Common Shares Attributable to Dilutive Effect of Equity Unit purchase contract payment balance

2,500,000

Series A Corporate Units

Forward Contract Indexed to Issuer's Equity [Line Items]

Shares Issued, Price Per Share

$ 100

Corporate Units Contract Annual Rate

7.75%

Shares To Be Issued Under Stock Purchase Contracts

35,200,000

Series C Preferred Stock

Forward Contract Indexed to Issuer's Equity [Line Items]

Shares To Be Issued Under Stock Purchase Contracts

35,200,000

Series A Preferred Stock

Forward Contract Indexed to Issuer's Equity [Line Items]

Preferred Stock, Dividend Rate, Percentage

5.65%

Preferred Stock, Liquidation Preference Per Share

$ 1,000

Preferred Stock, Dividend Rate, Initial Margin

2.843%

Preferred Stock, Dividend Rate, Initial Margin Plus 1.000%

1%

Preferred Stock, Amount of Preferred Dividends in Arrears

$ 1

Preferred Stock, Per Share Amounts of Preferred Dividends in Arrears

$ 2.51

Preferred Stock, Liquidation Preference, Value

$ 400

$ 400

$ 400

Series B Preferred Stock

Forward Contract Indexed to Issuer's Equity [Line Items]

Preferred Stock, Dividend Rate, Percentage

6.50%

Preferred Stock, Liquidation Preference Per Share

$ 25,000

Preferred Stock, Dividend Rate, Initial Margin

3.632%

Preferred Stock, Dividend Rate, Initial Margin Plus 1.000%

1%

Preferred Stock, Amount of Preferred Dividends in Arrears

$ 1.4

Preferred Stock, Per Share Amounts of Preferred Dividends in Arrears

$ 72.23

Preferred Stock Depositary Shares Issued

20,000,000

Preferred Stock, Liquidation Preference, Value

$ 500

$ 500

$ 500

Depositary Stock Liquidation Preference

$ 25

Series B-1 Preferred Stock

Forward Contract Indexed to Issuer's Equity [Line Items]

Preferred Stock, Shares Issued

20,000

Series C Preferred Stock

Forward Contract Indexed to Issuer's Equity [Line Items]

Preferred Stock, Liquidation Preference Per Share

$ 1,000

Preferred Stock, Liquidation Preference, Value

$ 863

Preferred Stock, Par or Stated Value Per Share

$ 0.01

Undivided Beneficial Ownership Interest, Percent

10%

Gross Proceeds | Series A Preferred Stock

Forward Contract Indexed to Issuer's Equity [Line Items]

Proceeds from Issuance of Preferred Stock and Preference Stock

$ 400

Gross Proceeds | Series B Preferred Stock

Forward Contract Indexed to Issuer's Equity [Line Items]

Proceeds from Issuance of Preferred Stock and Preference Stock

$ 500

Forward August 2021

Forward Contract Indexed to Issuer's Equity [Line Items]

Forward Contract Indexed to Issuer's Equity, Shares

5,941,598

Derivative, Forward Price

$ 25.25

$ 23.90

Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value

$ 142

Preferred Stock | Series A Preferred Stock

Forward Contract Indexed to Issuer's Equity [Line Items]

Proceeds from Issuance of Preferred Stock and Preference Stock

$ 393.9

Preferred Stock | Net Proceeds | Series B Preferred Stock

Forward Contract Indexed to Issuer's Equity [Line Items]

Proceeds from Issuance of Preferred Stock and Preference Stock

$ 486.1

At The Market Program

Forward Contract Indexed to Issuer's Equity [Line Items]

ATM Program Equity Remaining Available for Issuance

$ 300

Subsequent Event | Series A Preferred Stock

Forward Contract Indexed to Issuer's Equity [Line Items]

Preferred Stock, Liquidation Preference Per Share

$ 1,000

Equity (Schedule of Stock Offer

Equity (Schedule of Stock Offering Program) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
At The Market Stock Offering [Line Items]
Proceeds, net of fees (in millions)	$ 154.3	$ 299.6	$ 211.4
At The Market Program
At The Market Stock Offering [Line Items]
Number of shares issued	5,941,598	12,525,215	8,459,430
Average price per share	$ 25.25	$ 23.95	$ 23.60
Proceeds, net of fees (in millions)	$ 141.9	$ 288.1	$ 196.5

Equity (Schedule of Stock by Cl

Equity (Schedule of Stock by Class - Preferred) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding	1,302,500	1,302,500
Preferred Stock, Value, Outstanding	$ 1,546.5	$ 1,546.5
Series A Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Liquidation Preference Per Share	$ 1,000
Preferred Stock, Shares Outstanding	400,000
Preferred Stock, Dividends Per Share, Declared	$ 56.50	$ 56.50	$ 56.50
Preferred Stock, Value, Outstanding	$ 393.9	$ 393.9
Series B Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Liquidation Preference Per Share	$ 25,000
Preferred Stock, Shares Outstanding	20,000
Preferred Stock, Dividends Per Share, Declared	$ 1,625	$ 1,625	1,625
Preferred Stock, Value, Outstanding	$ 486.1	$ 486.1
Series C Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Liquidation Preference Per Share	$ 1,000
Preferred Stock, Shares Outstanding	862,500
Preferred Stock, Dividends Per Share, Declared	$ 0	$ 0	$ 0
Preferred Stock, Value, Outstanding	$ 666.5	$ 666.5

Equity (Schedule of Equity Unit

Equity (Schedule of Equity Units) (Details) - USD ($) shares in Thousands, $ in Millions		12 Months Ended
	Apr. 19, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Equity Units [Line Items]
Net Process from Sale	$ 835.5
Purchase Contract Liability	168.8	$ 65	$ 129.4	$ 0
Payments of Stock Issuance Costs	$ 27
Equity Units Stock Purchase Contract Liability Payment		$ 66.8	$ 41.2
Series A Corporate Units
Equity Units [Line Items]
Number of shares issued	8,625
Corporate Units Contract Annual Rate	7.75%
Preferred Stock
Equity Units [Line Items]
Payments of Stock Issuance Costs	$ 22.5
Purchase Contract Liability
Equity Units [Line Items]
Payments of Stock Issuance Costs	$ 4.5

Share-Based Compensation (Narra

Share-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended			24 Months Ended	36 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jan. 01, 2024	Dec. 31, 2023	Dec. 31, 2022	May 19, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for awards, shares	8,704,201					8,704,201
Common stock reserved for future awards, shares							10,000,000
Stock-based employee compensation expense	$ 19	$ 16.7	$ 13.5
Related tax benefits	3.6	4	3.3
Unrecognized compensation cost related to nonvested awards	$ 27					$ 27
Weighted-average remaining requisite service period, years	1 year 9 months 18 days
RTSR Modifier	25%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	3%
401(k) match, profit sharing and non-elective expense	$ 39.1	39.1	$ 37.8
Excess Tax Expense - Share Based Compensation		$ 0.4
Share-Based Payment Arrangement, Exercise of Option, Tax Benefit	$ 0.4
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	477,292
Shares nonvested	798,515	572,154				798,515
Shares vesting period, (years)						3 years
Granted, Weighted Average Grant Date Fair Value	$ 26.29
Restricted Stock Units (RSUs) | Share-based Payment Arrangement, Nonemployee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares nonvested	63,215					63,215
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	228,604					228,604
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	566,086	973,885	528,729
Shares nonvested	1,505,740	1,798,151				1,505,740
Granted, Weighted Average Grant Date Fair Value	$ 31.65
Performance Shares | NOEPS
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of shares granted	$ 7.4	$ 6.5	$ 11.7
Performance Shares | CVI
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of shares granted			$ 2.6
2019 Award | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			235,100
Shares nonvested	135,404					135,404
Share-based Compensation Arrangement by Share-based Payment Award, Grant Date Fair Value			$ 6.1
2020 award | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		285,755
Shares nonvested	218,465					218,465
Share-based Compensation Arrangement by Share-based Payment Award, Grant Date Fair Value		$ 5.7
2020 award | Performance Shares | NOEPS
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares nonvested	294,424					294,424
2020 award | Performance Shares | CVI
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares nonvested	67,943					67,943
2021 award | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	477,292
Shares nonvested	444,646					444,646
Share-based Compensation Arrangement by Share-based Payment Award, Grant Date Fair Value	$ 12.5
2021 award | Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		582,944
2021 award | Performance Shares | NOEPS
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares nonvested	192,119					192,119
2021 Special award | Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		390,941
Subsequent Event | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vesting period, (years)				3 years	3 years
Subsequent Event | Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vesting period, (years)					3 years

Share-Based Compensation (Sched

Share-Based Compensation (Schedule Of Transactions Of Restricted Stock Unit) (Details) - Restricted Stock Units (RSUs) - $ / shares	12 Months Ended	36 Months Ended
	Dec. 31, 2022	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested, Other Than Options	572,154
Nonvested, Weighted Average Grant Date Fair Value	$ 22.72
Granted, Other Than Options	477,292
Granted, Weighted Average Grant Date Fair Value	$ 26.29
Forfeited, Other Than Options	(133,367)
Forfeited, Weighted Average Grant Date Fair Value	$ 23.48
Vested, Other Than Options	(117,564)
Vested, Weighted Average Grant Date Fair Value	$ 24.44
Nonvested, Other Than Options	798,515	798,515
Nonvested, Weighted Average Grant Date Fair Value	$ 24.48	$ 24.48
Shares vesting period, (years)		3 years

Share-Based Compensation (Sch_2

Share-Based Compensation (Schedule Of Transactions Of Contingent Awards) (Details) - Performance Shares - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested, Other Than Options	1,798,151
Nonvested, Weighted Average Grant Date Fair Value	$ 23.78
Granted, Other Than Options	566,086	973,885	528,729
Granted, Weighted Average Grant Date Fair Value	$ 31.65
Forfeited, Other Than Options	(427,607)
Forfeited, Weighted Average Grant Date Fair Value	$ 24.34
Vested, Other Than Options	(430,890)
Vested, Weighted Average Grant Date Fair Value	$ 25.44
Nonvested, Other Than Options	1,505,740	1,798,151
Nonvested, Weighted Average Grant Date Fair Value	$ 26.10	$ 23.78

Share-Based Compensation (Sch_3

Share-Based Compensation (Schedule of Performance Award Details) (Details) - Performance Shares - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Performance Share Details [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	1,505,740	1,798,151
NOEPS
Performance Share Details [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 7.4	$ 6.5	$ 11.7
NOEPS | 2020 award
Performance Share Details [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	294,424
NOEPS | 2021 award
Performance Share Details [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	192,119
NOEPS | 2022 award
Performance Share Details [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	245,445
CVI
Performance Share Details [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value			$ 2.6
CVI | 2020 award
Performance Share Details [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	67,943
Relative Total Shareholder Return | 2021 award
Performance Share Details [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	192,119
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 10.6	6.7
Relative Total Shareholder Return | 2021 Special award | Share-based Payment Arrangement, Tranche Two
Performance Share Details [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	88,541
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value		3.2
Relative Total Shareholder Return | 2021 Special award | Share-based Payment Arrangement, Tranche One
Performance Share Details [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	179,703
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value		$ 4.8
Relative Total Shareholder Return | 2022 award
Performance Share Details [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	245,445

Long-Term Debt (Narrative) (Det

Long-Term Debt (Narrative) (Details) - USD ($) $ in Millions		12 Months Ended
	Jun. 07, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Aug. 30, 2022	Apr. 01, 2022
Debt Instrument [Line Items]
Senior Notes		$ 9,353	$ 9,003
Interest rate on debt		5.37%
Loss on early extinguishment of long-term debt		$ 0	$ 0	$ (243.5)
Debt Instrument, Convertible, Conversion Ratio		58.90%
Security interest and other subset of asset		$ 200
Asset sale covenant percentage of consolidated total assets		15%
Cross default provision on default relating to any indebtedness		$ 75
Percentage of additional subset of assets capped		10%
NiSource | Senior Notes
Debt Instrument [Line Items]
Senior Notes	$ 350
Debt, Weighted Average Interest Rate	5%
Proceeds from Debt, Net of Issuance Costs	$ 344.6
NiSource | Medium-term Notes
Debt Instrument [Line Items]
Medium-term Notes, Current					$ 10	$ 20
Debt, Weighted Average Interest Rate		7.99%			7.40%	7.99%
NIPSCO | Medium-term Notes
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate		7.64%
Columbia Of Massachusetts | Medium-term Notes
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate		6.37%
Maximum
Debt Instrument [Line Items]
Cross default provision on default relating to any indebtedness		$ 50
Minimum
Debt Instrument [Line Items]
Cross default provision on default relating to any indebtedness		$ 5
Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Debt Instrument, Convertible, Conversion Ratio		70%

Long-Term Debt (Schedule of Con

Long-Term Debt (Schedule of Consolidated Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2022	Aug. 30, 2022	Apr. 01, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Medium-Term Notes	$ 102			$ 132
Finance Lease, Liability	174.7			185.6
Senior Notes	9,353			9,003
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(76.1)			(79.1)
Long-term Debt, Excluding Current Maturities	$ 9,553.6			9,241.5
NiSource | 0.95% Notes Due 2025
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	0.95%
Senior Notes	$ 1,250			1,250
NiSource | 3.49% Notes due 2027
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	3.49%
Senior Notes	$ 1,000			1,000
NiSource | 6.78% Notes Due 2027
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	6.78%
Senior Notes	$ 3			3
NiSource | 2.95% Notes Due 2029
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	2.95%
Senior Notes	$ 750			750
NiSource | 3.60% Notes Due 2030
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	3.60%
Senior Notes	$ 1,000			1,000
NiSource | 1.70% Notes Due 2031
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	1.70%
Senior Notes	$ 750			750
NiSource | 6.25% Notes Due 2040
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	6.25%
Senior Notes	$ 152.6			152.6
NiSource | 5.95% Notes Due 2041
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.95%
Senior Notes	$ 347.4			347.4
NiSource | 5.80% Notes Due 2042
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.80%
Senior Notes	$ 250			250
NiSource | 5.25% Notes Due 2043
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.25%
Senior Notes	$ 500			500
NiSource | 4.80% Notes due 2044
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	4.80%
Senior Notes	$ 750			750
NiSource | 5.65% Notes Due 2045
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.65%
Senior Notes	$ 500			500
NiSource | 4.375% Notes due 2047
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	4.38%
Senior Notes	$ 1,000			1,000
NiSource | 3.95% Notes Due 2048
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	3.95%
Senior Notes	$ 750			750
NiSource | Medium-term Notes
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	7.99%	7.40%	7.99%
Medium-Term Notes	$ 29			49
NiSource | 5.00% Notes Due 2052
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5%
Senior Notes	$ 350			0
Columbia Of Massachusetts | Medium-term Notes
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	6.37%
Medium-Term Notes	$ 15			15
NIPSCO | Medium-term Notes
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	7.64%
Medium-Term Notes	$ 58			68
NIPSCO | Finance Leases
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	1.87%
Finance Lease, Liability	$ 16.5			18.7
Columbia Of Ohio | Finance Leases
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	6.15%
Finance Lease, Liability	$ 83.5			87.8
NiSource Corporate Services | Finance Leases
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	2.34%
Finance Lease, Liability	$ 48.6			51.4
Columbia Of Virginia | Finance Leases
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	6.26%
Finance Lease, Liability	$ 17			17.7
Columbia Of Kentucky | Finance Leases
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	3.79%
Finance Lease, Liability	$ 0.2			0.2
Columbia Of Pennsylvania | Finance Leases
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	6.28%
Finance Lease, Liability	$ 8.9			$ 9.8

Short-Term Borrowings (Narrativ

Short-Term Borrowings (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Short-term Debt [Line Items]
Line of Credit Facility, Amount Outstanding	$ 0	$ 0
Commercial paper outstanding	415	560
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount	347.2	0
Cash from financing activities	347.2	0
Accounts receivable securitization fees	2.5	$ 1.4	$ 2.6
Termination Loans	$ 1,000
Debt Instrument, Interest Rate, Stated Percentage	5.37%
Accounts Receivable Program
Short-term Debt [Line Items]
Seasonal Limit	$ 500
Commercial Paper
Short-term Debt [Line Items]
Revolving credit facility, maximum	$ 1,500
Short-term Debt, Weighted Average Interest Rate, at Point in Time	4.60%	0.24%
Revolving Credit Facility
Short-term Debt [Line Items]
Revolving credit facility, maximum	$ 1,850

Leases (Narrative) (Details)

Leases (Narrative) (Details)	12 Months Ended
	Dec. 31, 2022
Lessee, Lease, Description [Line Items]
Lessee, Lease Renewal Term	25 years
Lessee, Operating Lease, Renewal Term	1 year
Lessee, Finance Lease, Term of Contract	4 years
Fleet Lease
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	1 year
Minimum | Office Lease
Lessee, Lease, Description [Line Items]
Remaining Lease Term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	5 years
Maximum | Office Lease
Lessee, Lease, Description [Line Items]
Remaining Lease Term	21 years

Leases (Lease Cost) (Details)

Leases (Lease Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Finance lease cost
Amortization of right-of-use assets	$ 31.9	$ 28.8
Cash paid for interest on finance leases	8.5	9.4	$ 11.1
Total finance lease cost	40.4	38.2
Operating lease cost	10.4	15.6
Total lease cost	$ 50.8	$ 53.8

Leases (Right-of-Use Assets and

Leases (Right-of-Use Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Lessee, Lease, Description [Line Items]
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Net Property, Plant and Equipment	Net Property, Plant and Equipment
Finance Lease, Right-of-Use Asset	$ 153.4	$ 165.7
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Deferred charges and other	Deferred charges and other
Operating Lease, Right-of-Use Asset	$ 35.7	$ 33.8
Total leased assets	$ 189.1	$ 199.5
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Long-Term Debt and Lease Obligation, Current	Long-Term Debt and Lease Obligation, Current
Finance Lease, Liability, Current	$ 30	$ 28.1
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other Liabilities, Current	Other Liabilities, Current
Operating Lease, Liability, Current	$ 4.8	$ 6.7
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Long-Term Debt and Lease Obligation	Long-Term Debt and Lease Obligation
Finance Lease, Liability, Noncurrent	$ 144.7	$ 157.5
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other noncurrent liabilities	Other noncurrent liabilities
Operating Lease, Liability, Noncurrent	$ 31.9	$ 27.9
Total Lease Liability	$ 211.4	$ 220.2

Leases (Lease Information) (Det

Leases (Lease Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Finance Lease, Interest Payment on Liability	$ 8.6	$ 9.4
Operating Lease, Payments	10.3	15.4
Finance Lease, Principal Payments	30.3	25.7
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	19.3	22.4
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 8.8	$ 6
Finance Lease, Weighted Average Remaining Lease Term	9 years 10 months 24 days	10 years 7 months 6 days
Operating Lease, Weighted Average Remaining Lease Term	7 years 8 months 12 days	8 years 6 months
Finance Lease, Weighted Average Discount Rate, Percent	5.10%	5%
Operating Lease, Weighted Average Discount Rate, Percent	4%	3.70%

Leases (Lease Maturity) (Detail

Leases (Lease Maturity) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Lease Maturity [Line Items]
Total Future Minimum Lease Payments Due, Next Twelve Months	$ 46.8
Total Future Minimum Lease Payments, Due in Two Years	37.3
Total Future Minimum Lease Payments, Due in Three Years	30.3
Total Future Minimum Lease Payments, Due in Four Years	24.7
Total Future Minimum Lease Payments, Due in Five Years	19.9
Total Future Minimum Lease Payments, Due Thereafter	110.8
Total Future Minimum Lease Payments Due	269.8
Undiscounted Excess Amount	(58.4)
Total Lease Liability	211.4	$ 220.2
Short-term Lease Liability	34.8
Long-term Lease Liability	176.6
Finance Leases, Future Minimum Payments Due, Next Twelve Months	38.9
Finance Leases, Future Minimum Payments Due in Two Years	30.9
Finance Leases, Future Minimum Payments Due in Three Years	24.5
Finance Leases, Future Minimum Payments Due in Four Years	19.4
Finance Leases, Future Minimum Payments Due in Five Years	15.4
Finance Leases, Future Minimum Payments Due Thereafter	97.4
Finance Lease, Liability, Payment, Due	226.5
Finance Lease, Liability, Undiscounted Excess Amount	(51.8)
Finance Lease, Liability	174.7	185.6
Finance Lease, Liability, Current	30	28.1
Finance Lease, Liability, Noncurrent	144.7	157.5
Operating Leases, Future Minimum Payments Due, Next Twelve Months	7.9
Operating Leases, Future Minimum Payments, Due in Two Years	6.4
Operating Leases, Future Minimum Payments, Due in Three Years	5.8
Operating Leases, Future Minimum Payments, Due in Four Years	5.3
Operating Leases, Future Minimum Payments, Due in Five Years	4.5
Operating Leases, Future Minimum Payments, Due Thereafter	13.4
Lessee, Operating Lease, Liability, Payments, Due	43.3
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(6.6)
Operating Lease, Liability	36.7
Operating Lease, Liability, Current	4.8	6.7
Operating Lease, Liability, Noncurrent	$ 31.9	$ 27.9

Fair Value (Narrative) (Details

Fair Value (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Fair Value Disclosure [Line Items]
Transfers between Fair Value Hierarchies	$ 0	$ 0
Allowance for Credit Loss	0.9	(0.2)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease)	0
U.S. Treasury debt securities
Fair Value Disclosure [Line Items]
Allowance for Credit Loss	0	0
Available-for-sale securities, maturities of less than a year	5.2
Corporate/Other debt securities
Fair Value Disclosure [Line Items]
Allowance for Credit Loss	0.9	$ (0.2)
Available-for-sale securities, maturities of less than a year	$ 5.8

Fair Value (Fair Value Of Finan

Fair Value (Fair Value Of Financial Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Risk management assets	$ 84.8	$ 24.4
Available-for-sale debt securities	151.6	171.8
Total	236.4	196.2
Risk management liabilities	3	144.2
Total	3	144.2
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Risk management assets	0	0
Available-for-sale debt securities	0	0
Total	0	0
Risk management liabilities	0	0
Total	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Risk management assets		24.4
Available-for-sale debt securities	151.6	171.8
Total	236.4	196.2
Derivative Liability Statement Of Financial Position Extensible Enumeration Not Disclosed Flag		144.2
Risk management liabilities	3
Total	3	144.2
Derivative Asset Statement Of Financial Position Extensible Enumeration Not Disclosed Flag	84.8
Significant Unobservable Inputs (Level 3) [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Risk management assets	0	0
Available-for-sale debt securities	0	0
Total	0	0
Risk management liabilities	0	0
Total	$ 0	$ 0

Fair Value (Available-For-Sale

Fair Value (Available-For-Sale Securities) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Fair Value Disclosure [Line Items]
Amortized Cost	$ 166.7	$ 169.3
Gross Unrealized Gains	0	3.8
Gross Unrealized Losses	14.2	1.1
Allowance for Credit Loss	(0.9)	0.2
Fair Value	151.6	171.8
U.S. Treasury debt securities
Fair Value Disclosure [Line Items]
Amortized Cost	67.7	52.8
Gross Unrealized Gains	0	0.1
Gross Unrealized Losses	4.5	0.4
Allowance for Credit Loss	0	0
Fair Value	63.2	52.5
Debt Securities, Available-for-sale, Unrealized Loss Position	61	36.2
Corporate/Other debt securities
Fair Value Disclosure [Line Items]
Amortized Cost	99	116.5
Gross Unrealized Gains	0	3.7
Gross Unrealized Losses	9.7	0.7
Allowance for Credit Loss	(0.9)	0.2
Fair Value	88.4	119.3
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 85.5	$ 35.4

Fair Value (Carrying Amount And

Fair Value (Carrying Amount And Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Fair Value Disclosures [Abstract]
Long-term debt (including current portion), Carrying Amount	$ 9,553.6	$ 9,241.5
Long-term debt (including current portion), Estimated Fair Value	$ 8,479.4	$ 10,415.7

Other Commitments And Conting_3

Other Commitments And Contingencies (Narrative) (Details) $ in Millions	12 Months Ended	28 Months Ended
	Dec. 31, 2022 USD ($) Rate MW	Dec. 31, 2020 USD ($)	Dec. 31, 2021 USD ($)
Other Commitments And Contingencies [Line Items]
Wind power purchase agreement capacity | MW	500
Major Rail Operators	3
Line of Credit Facility, Amount Outstanding	$ 0		$ 0
Guarantor Obligations, Current Carrying Value	$ 841.6		288.9
Wind Power Purchase Agreement, Purchase Percentage | Rate	100%
Restructuring and Related Cost, Expected Cost	$ 38
Estimated Maximum Disgorgement Exposure	9.7
Proceeds from Legal Settlements	105
Accrual for Environmental Loss Contingencies, Gross	$ 86.5		91.1
MGP Sites
Other Commitments And Contingencies [Line Items]
Number of waste disposal sites identified by program	53
Liability for estimated remediation costs	$ 81		85.1
Reasonably possible remediation costs variance from reserve	$ 17
Columbia Of Massachusetts
Other Commitments And Contingencies [Line Items]
Pipeline Replacement Expenses		$ 258
Coal Transportation | Maximum
Other Commitments And Contingencies [Line Items]
Long Term Purchase Commitment Expiration Year	2028
Pipeline Service Agreements [Member] | Maximum
Other Commitments And Contingencies [Line Items]
Long Term Purchase Commitment Expiration Year	2038
Pipeline Service Agreements [Member] | Minimum
Other Commitments And Contingencies [Line Items]
Long Term Purchase Commitment Expiration Year	2023
IT Service Agreements [Member] | Maximum
Other Commitments And Contingencies [Line Items]
Long Term Purchase Commitment Expiration Year	2028
Standby Letters of Credit
Other Commitments And Contingencies [Line Items]
Line of Credit Facility, Amount Outstanding	$ 10.2		$ 18.9

Other Commitments and Conting_4

Other Commitments and Contingencies (Contractual Obligation, Fiscal Year Maturity Schedule) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Long-term Purchase Commitment [Line Items]
Long-term Debt, Future Minimum Payments Due	$ 9,455
Long-term Debt, Future Minimum Payments Due, Next Twelve Months	0
Long-term Debt, Future Minimum Payments, Due in Two Years	0
Long-term Debt, Future Minimum Payments, Due in Three Years	1,260
Long-term Debt, Future Minimum Payments, Due in Four Years	0
Long-term Debt, Future Minimum Payments, Due in Five Years	1,090
Long-term Debt, Future Minimum Payments, Due Thereafter	7,105
Interest Payments on Long-term Debt, Future Minimum Payments Due	5,890.4
Interest Payments on Long-term Debt, Future Minimum Payments Due, Next Twelve Months	351.6
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Two Years	351.6
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Three Years	351.6
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Four Years	339.1
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Five Years	319.7
Interest Payments on Long-term Debt, Future Minimum Payments, Due Thereafter	4,176.8
Finance Leases, Future Minimum Payments Due	226.5
Finance Leases, Future Minimum Payments Due, Next Twelve Months	38.9
Finance Leases, Future Minimum Payments Due in Two Years	30.9
Finance Leases, Future Minimum Payments Due in Three Years	24.5
Finance Leases, Future Minimum Payments Due in Four Years	19.4
Finance Leases, Future Minimum Payments Due in Five Years	15.4
Finance Leases, Future Minimum Payments Due Thereafter	97.4
Operating Leases, Future Minimum Payments Due	43.3
Operating Leases, Future Minimum Payments Due, Next Twelve Months	7.9
Operating Leases, Future Minimum Payments, Due in Two Years	6.4
Operating Leases, Future Minimum Payments, Due in Three Years	5.8
Operating Leases, Future Minimum Payments, Due in Four Years	5.3
Operating Leases, Future Minimum Payments, Due in Five Years	4.5
Operating Leases, Future Minimum Payments, Due Thereafter	13.4
Energy Commodity Contracts, Future Minimum Payments Due	231.7
Energy Commodity Contracts, Future Minimum Payments Due, Next Twelve Months	119.7
Energy Commodity Contracts, Future Minimum Payments, Due in Two Years	76
Energy Commodity Contracts, Future Minimum Payments, Due in Three Years	36
Energy Commodity Contracts, Future Minimum Payments, Due in Four Years	0
Energy Commodity Contracts, Future Minimum Payments, Due in Five Years	0
Energy Commodity Contracts, Future Minimum Payments, Due Thereafter	0
Service Obligations, Pipeline Service Obligations, Future Minimum Payments Due	2,484.9
Service Obligations, Pipeline Service Obligations, Future Minimum Payments Due, Next Twelve Months	642.2
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Two Years	556.9
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Three Years	410.5
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Four Years	337.2
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Five Years	328.8
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due Thereafter	209.3
Service Obligations, IT Service Obligations, Future Minimum Payments Due	177.4
Service Obligations, IT Service Obligations, Future Minimum Payments Due, Next Twelve Months	71.9
Service Obligations, IT Service Obligations, Future Minimum Payments, Due in Two Years	50
Service Obligations, IT Service Obligations, Future Minimum Payments, Due in Three Years	41.3
Service Obligations, IT Service Obligations, Future Minimum Payments, Due in Four Years	11.4
Service Obligations, IT Service Obligations, Future Minimum Payments, Due in Five Years	2.8
Service Obligations, IT Service Obligations, Future Minimum Payments, Due Thereafter	0
Other Liabilities, Future Minimum Payments Due	654.2
Other Liabilities, Future Minimum Payments Due, Next Twelve Months	612.5
Other Liabilities, Future Minimum Payments, Due in Two Years	6.2
Other Liabilities, Future Minimum Payments, Due in Three Years	5.9
Other Liabilities, Future Minimum Payments, Due in Four Years	5.2
Other Liabilities, Future Minimum Payments, Due in Five Years	5.2
Other Liabilities, Future Minimum Payments, Due Thereafter	19.2
Total Future Contractual Obligations Due	19,163.4
Total Future Contractual Obligations Due, Next Twelve Months	1,844.7
Total Future Contractual Obligations, Due in Two Years	1,078
Total Future Contractual Obligations, Due in Three Years	2,135.6
Total Future Contractual Obligations, Due in Four Years	717.6
Total Future Contractual Obligations, Due in Five Years	1,766.4
Total Future Contractual Obligations, Due Thereafter	11,621.1
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(76.1)	$ (79.1)
Finance Lease, Liability, Undiscounted Excess Amount	(51.8)
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	$ (6.6)

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss (Components Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	$ 87.1	$ 28.4	$ (64.6)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	2.6	1.5	0.5
Net current-period other comprehensive income (loss)	89.7	29.9	(64.1)
Accumulated other comprehensive loss	(37.1)	(126.8)	(156.7)	$ (92.6)
Gains and Losses on Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(13.7)	(3.5)	3.3
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0.4	(0.4)	(0.6)
Net current-period other comprehensive income (loss)	(13.3)	(3.9)	2.7
Accumulated other comprehensive loss	(11.2)	2.1	6	3.3
Gains and Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	109.7	25.3	(70.8)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0.2	0.1	0.1
Net current-period other comprehensive income (loss)		25.4	(70.7)
Accumulated other comprehensive loss	(12.6)	(122.5)	(147.9)	(77.2)
Pension and OPEB Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(8.9)	6.6	2.9
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	2	1.8	1
Net current-period other comprehensive income (loss)	(6.9)	8.4	3.9
Accumulated other comprehensive loss	$ (13.3)	$ (6.4)	$ (14.8)	$ (18.7)

Segments Of Business (Narrative

Segments Of Business (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2020 USD ($)
Goodwill [Line Items]
Number of Reportable Segments	2
Disposal Group, Not Discontinued Operations, Gain (Loss) on Write Down		$ 412.4

Segments Of Business (Schedule

Segments Of Business (Schedule Of Operating Income Derived From Revenues And Expenses By Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Operating Revenues	$ 5,850.6	$ 4,899.6	$ 4,681.7
Operating Income	1,265.8	1,006.9	550.8
Consolidated Depreciation and Amortization	820.8	748.4	725.9
Consolidated Assets	26,736.6	24,156.9	22,040.5
Payments to Acquire Property Plant and Equipment Including Captial Expenditures From Current Liabilities And Equity Method Investments	2,298	1,940.4	1,720.8
Gas Distribution Operations
Segment Reporting Information [Line Items]
Operating Revenues	4,007.2	3,171.2	3,128.1
Intersegment	4,019.8	3,183.5	3,140.2
Operating Income	915.8	617.5	199.1
Consolidated Depreciation and Amortization	415.9	383	363.1
Consolidated Assets	16,986.5	15,153.7	13,433
Payments to Acquire Property Plant and Equipment Including Captial Expenditures From Current Liabilities And Equity Method Investments	1,682.3	1,406.4	1,266.9
Electric Operations
Segment Reporting Information [Line Items]
Operating Revenues	1,830.9	1,696.3	1,535.9
Intersegment	1,831.7	1,697.1	1,536.6
Operating Income	362.4	387.8	348.8
Consolidated Depreciation and Amortization	362.9	329.4	321.3
Consolidated Assets	7,992.6	7,178.9	6,443.1
Payments to Acquire Property Plant and Equipment Including Captial Expenditures From Current Liabilities And Equity Method Investments	574.5	517.4	422.8
Corporate and Other
Segment Reporting Information [Line Items]
Operating Revenues	12.5	32.1	17.7
Intersegment	477.5	492.4	467.5
Operating Income	(12.4)	1.6	2.9
Consolidated Depreciation and Amortization	42	36	41.5
Consolidated Assets	1,757.5	1,824.3	2,164.4
Payments to Acquire Property Plant and Equipment Including Captial Expenditures From Current Liabilities And Equity Method Investments	41.2	16.6	31.1
Unaffiliated | Gas Distribution Operations
Segment Reporting Information [Line Items]
Operating Revenues	4,007.2	3,171.2	3,128.1
Unaffiliated | Electric Operations
Segment Reporting Information [Line Items]
Operating Revenues	1,830.9	1,696.3	1,535.9
Unaffiliated | Corporate and Other
Segment Reporting Information [Line Items]
Operating Revenues	12.5	32.1	17.7
Intersegment | Gas Distribution Operations
Segment Reporting Information [Line Items]
Intersegment	12.6	12.3	12.1
Intersegment | Electric Operations
Segment Reporting Information [Line Items]
Intersegment	0.8	0.8	0.7
Intersegment | Corporate and Other
Segment Reporting Information [Line Items]
Intersegment	465	460.3	449.8
Eliminations
Segment Reporting Information [Line Items]
Intersegment	$ (478.4)	$ (473.4)	$ (462.6)

Other, Net (Schedule Of Other N

Other, Net (Schedule Of Other Net) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other Nonoperating Income [Line Items]
Interest income	$ 4.3	$ 4	$ 5.5
AFUDC equity	15.1	13.1	9.9
Charitable Contributions	(4.4)	(11.5)	(1.5)
Pension and Other Postretirement Non Service Cost	27.6	35.5	9.3
Sale of emission reduction credits	0	0	4.6
Miscellaneous	(0.4)	(0.3)	4.3
Total Other, net	52.2	40.8	32.1
Interest Rate Swap Settled
Other Nonoperating Income [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 10	$ 0	$ 0

Interest Expense, Net (Details)

Interest Expense, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Interest Expense [Abstract]
Interest on long-term debt	$ 344.5	$ 336.4	$ 354.2
Interest on short-term borrowings	22.7	0.6	14.7
Debt discount/cost amortization	11.7	11	9.1
Accounts receivable securitization fees	2.5	1.4	2.6
Allowance for borrowed funds used and interest capitalized during construction	(6.7)	(4.6)	(7)
Debt-based post-in-service carrying charges	(21.1)	(14.7)	(14.6)
Other	8	11	11.7
Total Interest Expense, net	$ 361.6	$ 341.1	$ 370.7

Supplemental Cash Flow Inform_3

Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Apr. 19, 2021
Non-cash transactions:
Capital expenditures included in current liabilities	$ 275.1	$ 245.7	$ 170.4
Assets acquired under a finance lease		22.4	59.3
Assets acquired under an operating lease		6	10.9
Reclassification of other property to regulatory assets	0	607.6	0
Assets recorded for asset retirement obligations	6.3	12	91.5
Obligation to the Developer	0	277.5	69.7
Purchase Contract Liability	65	129.4	0	$ 168.8
Schedule of interest and income taxes paid:
Cash paid for interest on long-term debt, net of interest capitalized amounts	343.8	322.4	349
Cash paid for interest on finance leases	8.5	9.4	11.1
Cash paid for income taxes, net of refunds(5)	$ 7.2	$ 5.4	$ (1)

Valuation and Qualifying Acco_2

Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reserve For Accounts Receivable [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	$ 23.5	$ 52.3	$ 19.2
Valuation Allowances and Reserves, Charged to Cost and Expense	20.6	18.3	31.6
Valuation Allowances and Reserves, Charged to Other Accounts	(36.4)	(6.4)	(33)
Deductions for Purposes for which Reserves were Created	56.6	53.5	31.5
Ending Balance	23.9	23.5	52.3
Reserve For Other Investments [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	2.3	0	3
Valuation Allowances and Reserves, Charged to Cost and Expense	0	0	0
Valuation Allowances and Reserves, Charged to Other Accounts			0
Deductions for Purposes for which Reserves were Created	0	0	3
Ending Balance	1	2.3	$ 0
Reserve for Deferred Charges and Other
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Charged to Other Accounts	$ (1.3)	$ (2.3)