$NI
NISOURCE INC. Stock $ni

$ni Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-K Financial Statement

#000111171122000007 Filed on February 23, 2022

Income Statement

Concept	2021 Q4	2021	2020 Q4
Revenue	$1.409B	$4.731B	$1.211B
YoY Change	16.32%	5.77%	-13.33%
Cost Of Revenue	$478.9M	$1.392B	$315.4M
YoY Change	51.84%	25.51%	-21.99%
Gross Profit	$929.7M	$3.507B	$1.211B
YoY Change	-23.23%	-1.82%	-13.33%
Gross Profit Margin	66.0%	74.13%	100.0%
Selling, General & Admin		$15.60M
YoY Change		-23.15%
% of Gross Profit		0.44%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$188.2M	$748.4M	$183.5M
YoY Change	2.56%	3.1%	0.71%
% of Gross Profit	20.24%	21.34%	15.15%
Operating Expenses	$644.5M	$2.493B	$666.7M
YoY Change	-3.33%	-4.53%	8.18%
Operating Profit	$285.2M	$1.007B	$218.1M
YoY Change	30.77%	82.81%	-673.95%
Interest Expense	-$86.30M	$341.1M	-$84.50M
YoY Change	2.13%	-7.98%	-7.14%
% of Operating Profit	-30.26%	33.88%	-38.74%
Other Income/Expense, Net	$2.300M	-$300.3M	$11.10M
YoY Change	-79.28%	-48.41%	-242.31%
Pretax Income	$200.4M	$706.6M	$144.6M
YoY Change	38.59%	-2357.51%	-205.7%
Income Tax	$27.20M	$117.8M	$56.80M
% Of Pretax Income	13.57%	16.67%	39.28%
Net Earnings	$165.9M	$584.9M	$84.40M
YoY Change	96.56%	-3423.3%	-160.59%
Net Earnings / Revenue	11.78%	12.36%	6.97%
Basic Earnings Per Share		$1.35	$0.18
Diluted Earnings Per Share	$393.3K	$1.27	$0.18
COMMON SHARES
Basic Shares Outstanding	392.7M shares	393.6M shares	383.2M shares
Diluted Shares Outstanding		417.3M shares

Balance Sheet

Concept	2021 Q4	2021	2020 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$84.20M	$84.20M	$117.0M
YoY Change	-28.03%	-28.03%	-15.83%
Cash & Equivalents	$84.20M	$84.20M	$116.5M
Short-Term Investments
Other Short-Term Assets	$195.8M	$412.7M	$86.00M
YoY Change	127.67%	30.6%	22.51%
Inventory	$498.7M	$498.7M	$401.0M
Prepaid Expenses
Receivables	$825.6M	$825.6M	$791.3M
Other Receivables	$99.60M	$99.60M	$34.00M
Total Short-Term Assets	$1.921B	$1.921B	$1.659B
YoY Change	15.75%	15.78%	-10.49%
LONG-TERM ASSETS
Property, Plant & Equipment	$17.88B	$17.92B	$16.62B
YoY Change	7.6%	7.54%	-1.73%
Goodwill	$1.486B		$1.486B
YoY Change	0.0%		0.0%
Intangibles	$0.00		$0.00
YoY Change
Long-Term Investments	$259.7M	$259.7M	$252.0M
YoY Change	3.06%	3.06%	9.57%
Other Assets	$4.095B	$2.575B	$3.510B
YoY Change	16.67%	29.78%	-4.2%
Total Long-Term Assets	$22.24B	$22.24B	$20.38B
YoY Change	9.1%	9.1%	-2.04%
TOTAL ASSETS
Total Short-Term Assets	$1.921B	$1.921B	$1.659B
Total Long-Term Assets	$22.24B	$22.24B	$20.38B
Total Assets	$24.16B	$24.16B	$22.04B
YoY Change	9.6%	9.6%	-2.73%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$697.8M	$697.8M	$589.0M
YoY Change	18.47%	18.47%	-11.56%
Accrued Expenses	$670.2M	$670.2M	$389.0M
YoY Change	72.29%	72.29%	-31.15%
Deferred Revenue	$237.9M		$243.3M
YoY Change	-2.22%		-5.11%
Short-Term Debt	$560.0M	$560.0M	$503.0M
YoY Change	11.33%	11.33%	-71.63%
Long-Term Debt Due	$58.10M	$58.10M	$23.00M
YoY Change	152.61%	152.61%	76.92%
Total Short-Term Liabilities	$2.746B	$2.746B	$2.279B
YoY Change	20.48%	20.5%	-39.15%
LONG-TERM LIABILITIES
Long-Term Debt	$9.183B	$9.183B	$9.220B
YoY Change	-0.4%	-0.4%	17.36%
Other Long-Term Liabilities	$690.2M	$3.295B	$515.5M
YoY Change	33.89%	1.92%	125.9%
Total Long-Term Liabilities	$4.954B	$12.48B	$4.704B
YoY Change	5.33%	0.2%	-7.25%
TOTAL LIABILITIES
Total Short-Term Liabilities	$2.746B	$2.746B	$2.279B
Total Long-Term Liabilities	$4.954B	$12.48B	$4.704B
Total Liabilities	$7.701B	$17.21B	$6.983B
YoY Change	10.28%	5.66%	-20.8%
SHAREHOLDERS EQUITY
Retained Earnings	-$1.581B		-$1.765B
YoY Change	-10.44%		28.77%
Common Stock	$7.208B		$6.894B
YoY Change	4.56%		3.36%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$99.90M		$99.90M
YoY Change	0.0%		0.0%
Treasury Stock Shares
Shareholders Equity	$6.947B	$6.947B	$5.752B
YoY Change
Total Liabilities & Shareholders Equity	$24.16B	$24.16B	$22.04B
YoY Change	9.6%	9.6%	-2.73%

Cashflow Statement

Concept	2021 Q4	2021	2020 Q4
OPERATING ACTIVITIES
Net Income	$165.9M	$584.9M	$84.40M
YoY Change	96.56%	-3423.3%	-160.59%
Depreciation, Depletion And Amortization	$188.2M	$748.4M	$183.5M
YoY Change	2.56%	3.1%	0.71%
Cash From Operating Activities	$278.6M	$1.218B	$245.4M
YoY Change	13.53%	10.32%	-30.18%
INVESTING ACTIVITIES
Capital Expenditures	-$572.3M	$1.838B	-$502.0M
YoY Change	14.0%	4.54%	-3.67%
Acquisitions
YoY Change
Other Investing Activities	-$238.4M	$1.000M	$1.023B
YoY Change	-123.31%	900.0%	-13737.33%
Cash From Investing Activities	-$810.7M	-$2.205B	$520.8M
YoY Change	-255.66%	150.81%	-198.52%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$299.6M
YoY Change		-241.72%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	570.7M	$956.3M	-708.2M
YoY Change	-180.58%	-486.07%	-345.48%
NET CHANGE
Cash From Operating Activities	278.6M	$1.218B	245.4M
Cash From Investing Activities	-810.7M	-$2.205B	520.8M
Cash From Financing Activities	570.7M	$956.3M	-708.2M
Net Change In Cash	38.60M	-$30.70M	58.00M
YoY Change	-33.45%	34.65%	-47.94%
FREE CASH FLOW
Cash From Operating Activities	$278.6M	$1.218B	$245.4M
Capital Expenditures	-$572.3M	$1.838B	-$502.0M
Free Cash Flow	$850.9M	-$620.1M	$747.4M
YoY Change	13.85%	-5.2%	-14.35%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2021	dei	Entity Central Index Key EntityCentralIndexKey	0001111711
CY2021	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
CY2021	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2021	dei	Amendment Flag AmendmentFlag	false
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#PublicUtilitiesPropertyPlantAndEquipmentNet
CY2021Q4	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#PublicUtilitiesPropertyPlantAndEquipmentNet
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://www.nisource.com/20211231#DeferredChargesAndOther
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://www.nisource.com/20211231#DeferredChargesAndOther
CY2020Q4	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#LongTermDebtAndCapitalLeaseObligationsCurrent
CY2021Q4	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#LongTermDebtAndCapitalLeaseObligationsCurrent
CY2021Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherLiabilitiesCurrent
CY2020Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherLiabilitiesCurrent
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#LongTermDebtAndCapitalLeaseObligations
CY2021Q4	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#LongTermDebtAndCapitalLeaseObligations
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherLiabilitiesNoncurrent
CY2021Q4	us-gaap	Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherLiabilitiesNoncurrent
CY2021	dei	Document Type DocumentType	10-K
CY2021	dei	Document Annual Report DocumentAnnualReport	true
CY2021	dei	Document Period End Date DocumentPeriodEndDate	2021-12-31
CY2021	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2021	dei	Document Transition Report DocumentTransitionReport	false
CY2021	dei	Entity File Number EntityFileNumber	001-16189
CY2021	dei	Entity Registrant Name EntityRegistrantName	NiSource Inc.
CY2021	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2021	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	35-2108964
CY2021	dei	Entity Address Address Line1 EntityAddressAddressLine1	801 East 86th Avenue
CY2021	dei	Entity Address City Or Town EntityAddressCityOrTown	Merrillville,
CY2021	dei	Entity Address State Or Province EntityAddressStateOrProvince	IN
CY2021	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	46410
CY2021	dei	City Area Code CityAreaCode	(877)
CY2021	dei	Local Phone Number LocalPhoneNumber	647-5990
CY2021	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2021	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2021	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2021	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2021	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2021	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2021	dei	Entity Small Business EntitySmallBusiness	false
CY2021	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2021	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2021	dei	Entity Shell Company EntityShellCompany	false
CY2021Q2	dei	Entity Public Float EntityPublicFloat	9579675045	USD
CY2022Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	405385010	shares
CY2021	us-gaap	Debt Instrument Convertible Conversion Ratio1 DebtInstrumentConvertibleConversionRatio1	0.574	Rate
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CY2021	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	4899600000	USD
CY2021	dei	Auditor Name AuditorName	DELOITTE & TOUCHE LLP
CY2021	dei	Auditor Location AuditorLocation	Columbus, Ohio
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CY2021	nix	Impairment And Gain Loss On Sale Of Assets Net ImpairmentAndGainLossOnSaleOfAssetsNet	7700000	USD
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CY2019	nix	Impairment And Gain Loss On Sale Of Assets Net ImpairmentAndGainLossOnSaleOfAssetsNet	0	USD
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CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-1600000	USD
CY2021Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	25171300000	USD
CY2021Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	7289500000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	7560400000	USD
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CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	16619500000	USD
CY2021Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	800000	USD
CY2020Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	0	USD
CY2021Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	169300000	USD
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CY2021Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	-200000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	-500000	USD
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CY2020Q4	us-gaap	Available For Sale Securities Debt Securities Noncurrent AvailableForSaleSecuritiesDebtSecuritiesNoncurrent	170900000	USD
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CY2020Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	81100000	USD
CY2021Q4	us-gaap	Investments And Other Noncurrent Assets InvestmentsAndOtherNoncurrentAssets	259700000	USD
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CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	84200000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	116500000	USD
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CY2020Q4	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	68400000	USD
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CY2021Q4	us-gaap	Assets Current AssetsCurrent	1920800000	USD
CY2020Q4	us-gaap	Assets Current AssetsCurrent	1659400000	USD
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CY2020Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1794800000	USD
CY2021Q4	us-gaap	Goodwill Goodwill	1485900000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	1485900000	USD
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CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	3509600000	USD
CY2021Q4	us-gaap	Assets Assets	24156900000	USD
CY2020Q4	us-gaap	Assets Assets	22040500000	USD
CY2021Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
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CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	600000000	shares
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CY2021Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	20000000	shares
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CY2021Q4	us-gaap	Preferred Stock Value Outstanding PreferredStockValueOutstanding	1546500000	USD
CY2020Q4	us-gaap	Preferred Stock Value Outstanding PreferredStockValueOutstanding	880000000.0	USD
CY2021Q4	us-gaap	Treasury Stock Value TreasuryStockValue	99900000	USD
CY2020Q4	us-gaap	Treasury Stock Value TreasuryStockValue	99900000	USD
CY2021Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	7204300000	USD
CY2020Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	6890100000	USD
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CY2021Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	9183400000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	9219800000	USD
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CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	23300000	USD
CY2021Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	560000000.0	USD
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CY2021Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	277100000	USD
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CY2020Q4	nix	Exchange Gas Payable ExchangeGasPayable	48500000	USD
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CY2021Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	382000000.0	USD
CY2020Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	220400000	USD
CY2021Q4	us-gaap	Liabilities Current LiabilitiesCurrent	2746200000	USD
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	2279400000	USD
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CY2021Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	1842600000	USD
CY2020Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	1904200000	USD
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CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	515500000	USD
CY2021Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	4954400000	USD
CY2020Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	4703500000	USD
CY2021Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	24156900000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	22040500000	USD
CY2021	us-gaap	Profit Loss ProfitLoss	588800000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	-14200000	USD
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CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	24300000	USD
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CY2021	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-5600000	USD
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CY2019	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-21100000	USD
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CY2021	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-30000000.0	USD
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CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1217900000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1104000000	USD
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CY2021	us-gaap	Payments For Removal Costs PaymentsForRemovalCosts	121100000	USD
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CY2021	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	102900000	USD
CY2020	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	144700000	USD
CY2019	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	140400000	USD
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CY2021	nix	Payment To Renewable Generation Asset Developer PaymentToRenewableGenerationAssetDeveloper	240400000	USD
CY2020	nix	Payment To Renewable Generation Asset Developer PaymentToRenewableGenerationAssetDeveloper	85300000	USD
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CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-879100000	USD
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CY2019	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	0	USD
CY2021	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	600000	USD
CY2020	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	0	USD
CY2019	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	0	USD
CY2021	us-gaap	Proceeds From Other Equity ProceedsFromOtherEquity	839900000	USD
CY2020	us-gaap	Proceeds From Other Equity ProceedsFromOtherEquity	0	USD
CY2019	us-gaap	Proceeds From Other Equity ProceedsFromOtherEquity	0	USD
CY2021	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	345200000	USD
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	321600000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	298500000	USD
CY2021	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	55100000	USD
CY2020	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	55100000	USD
CY2019	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	56100000	USD
CY2021	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-40500000	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	956300000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-247700000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	366400000	USD
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-30700000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-22800000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	27300000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	125600000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	148400000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	121100000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	94900000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	125600000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	148400000	USD
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	84200000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	116500000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	139300000	USD
CY2021Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	10700000	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	9100000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	9100000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	94900000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	125600000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	148400000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5750900000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	383100000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-55400000	USD
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.80
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	298500000	USD
CY2019	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	56100000	USD
CY2019	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	5600000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	10400000	USD
CY2019	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	17600000	USD
CY2019	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	229100000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5986700000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	-14200000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-64100000	USD
CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.84
CY2020	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	321700000	USD
CY2020	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	55100000	USD
CY2020	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	82200000	USD
CY2020	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	5700000	USD
CY2020	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	8400000	USD
CY2020	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	13400000	USD
CY2020	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	196500000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5837800000	USD
CY2021	us-gaap	Profit Loss ProfitLoss	588800000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	29900000	USD
CY2021	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.88
CY2021	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	345500000	USD
CY2021	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	55100000	USD
CY2021	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	236700000	USD
CY2021	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	600000	USD
CY2021	nix	Stock Issued During The Period Equity Units Value StockIssuedDuringThePeriodEquityUnitsValue	666500000	USD
CY2021	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	5000000.0	USD
CY2021	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	11800000	USD
CY2021	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	9500000	USD
CY2021	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	288100000	USD
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7272900000	USD
CY2018Q4	us-gaap	Shares Issued SharesIssued	372363000	shares
CY2019	nix	Stock Issued Duringthe Period Shares Preferred StockIssuedDuringthePeriodSharesPreferred	0	shares
CY2019	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	201000	shares
CY2019	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	518000	shares
CY2019	us-gaap	Stock Issued During Period Shares Employee Benefit Plan StockIssuedDuringPeriodSharesEmployeeBenefitPlan	631000	shares
CY2019	us-gaap	Stock Issued During Period Shares Other StockIssuedDuringPeriodSharesOther	8423000	shares
CY2019Q4	us-gaap	Shares Issued SharesIssued	382136000	shares
CY2020	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	236000	shares
CY2020	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	385000	shares
CY2020	us-gaap	Stock Issued During Period Shares Employee Benefit Plan StockIssuedDuringPeriodSharesEmployeeBenefitPlan	544000	shares
CY2020	us-gaap	Stock Issued During Period Shares Other StockIssuedDuringPeriodSharesOther	8459000	shares
CY2020Q4	us-gaap	Shares Issued SharesIssued	391760000	shares
CY2020	nix	Stock Issued During The Period Shares Equity Units StockIssuedDuringThePeriodSharesEquityUnits	0	shares
CY2021	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	209000	shares
CY2021	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	418000	shares
CY2021	us-gaap	Stock Issued During Period Shares Employee Benefit Plan StockIssuedDuringPeriodSharesEmployeeBenefitPlan	391000	shares
CY2021	us-gaap	Stock Issued During Period Shares Other StockIssuedDuringPeriodSharesOther	12525000	shares
CY2021Q4	us-gaap	Shares Issued SharesIssued	405303000	shares
CY2021	nix	Number Of Customers NumberOfCustomers	3700000
CY2021	us-gaap	Use Of Estimates UseOfEstimates	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.
CY2020	us-gaap	Impairment Of Investments ImpairmentOfInvestments	0	USD
CY2019	us-gaap	Impairment Of Investments ImpairmentOfInvestments	0	USD
CY2021	us-gaap	Impairment Of Investments ImpairmentOfInvestments	0	USD
CY2021	nix	Pre Tax Rate For Allowance For Funds Used During Construction PreTaxRateForAllowanceForFundsUsedDuringConstruction	0.033
CY2020	nix	Pre Tax Rate For Allowance For Funds Used During Construction PreTaxRateForAllowanceForFundsUsedDuringConstruction	0.026
CY2019	nix	Pre Tax Rate For Allowance For Funds Used During Construction PreTaxRateForAllowanceForFundsUsedDuringConstruction	0.030
CY2021Q4	us-gaap	Lifo Inventory Amount LIFOInventoryAmount	44900000	USD
CY2020Q4	us-gaap	Lifo Inventory Amount LIFOInventoryAmount	42300000	USD
CY2021Q4	us-gaap	Excess Of Replacement Or Current Costs Over Stated Lifo Value ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue	13600000	USD
CY2020Q4	us-gaap	Excess Of Replacement Or Current Costs Over Stated Lifo Value ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue	19600000	USD
CY2021Q4	us-gaap	Weighted Average Cost Inventory Amount WeightedAverageCostInventoryAmount	282400000	USD
CY2020Q4	us-gaap	Weighted Average Cost Inventory Amount WeightedAverageCostInventoryAmount	148800000	USD
CY2021	nix	Service Area By County ServiceAreaByCounty	20
CY2021	us-gaap	Regulated Operating Revenue Other RegulatedOperatingRevenueOther	168300000	USD
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4731300000	USD
CY2021	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	4899600000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4473200000	USD
CY2020	us-gaap	Regulated Operating Revenue Other RegulatedOperatingRevenueOther	208500000	USD
CY2020	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	4681700000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	5053400000	USD
CY2019	us-gaap	Regulated Operating Revenue Other RegulatedOperatingRevenueOther	155500000	USD
CY2019	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	5208900000	USD
CY2020Q4	nix	Customer Accounts Receivable Billed Less Reserve CustomerAccountsReceivableBilledLessReserve	400000000.0	USD
CY2020Q4	nix	Customer Accounts Receivable Unbilled Less Reserve CustomerAccountsReceivableUnbilledLessReserve	327200000	USD
CY2021Q4	nix	Customer Accounts Receivable Billed Less Reserve CustomerAccountsReceivableBilledLessReserve	459600000	USD
CY2021Q4	nix	Customer Accounts Receivable Unbilled Less Reserve CustomerAccountsReceivableUnbilledLessReserve	337000000.0	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	52300000	USD
CY2021	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	7200000	USD
CY2021	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	54400000	USD
CY2021	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	18400000	USD
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	23500000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	13000000.0	USD
CY2020	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	54600000	USD
CY2020	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	29700000	USD
CY2020	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	14400000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	52300000	USD
CY2021Q4	nix	Wind Power Purchase Agreement Purchase Percentage WindPowerPurchaseAgreementPurchasePercentage	1	Rate
CY2021Q4	us-gaap	Minority Interest MinorityInterest	325600000	USD
CY2020Q4	us-gaap	Minority Interest MinorityInterest	85600000	USD
CY2021	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	3900000	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	3400000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	529800000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-72700000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	328000000.0	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	328000000.0	USD
CY2021	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	1600000	USD
CY2020	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	0	USD
CY2019	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	0	USD
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	531400000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-72700000	USD
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	393600000	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	384300000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	374600000	shares
CY2021	nix	Incremental Common Shares Attributable To Dilutive Effect Of Equity Unit Purchase Agreements If Converted IncrementalCommonSharesAttributableToDilutiveEffectOfEquityUnitPurchaseAgreementsIfConverted	22000000.0	shares
CY2020	nix	Incremental Common Shares Attributable To Dilutive Effect Of Equity Unit Purchase Agreements If Converted IncrementalCommonSharesAttributableToDilutiveEffectOfEquityUnitPurchaseAgreementsIfConverted	0	shares
CY2019	nix	Incremental Common Shares Attributable To Dilutive Effect Of Equity Unit Purchase Agreements If Converted IncrementalCommonSharesAttributableToDilutiveEffectOfEquityUnitPurchaseAgreementsIfConverted	0	shares
CY2021	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	800000	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	0	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	900000	shares
CY2021	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	300000	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	200000	shares
CY2021	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	600000	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	0	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	300000	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	417300000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	384300000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	376000000.0	shares
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.35
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.19
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.88
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.27
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.19
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.87
CY2021Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	25171300000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	24179900000	USD
CY2021Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	7289500000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	7560400000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	17881800000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	16619500000	USD
CY2020Q4	nix	Plant And Equipment Associated With Schahfer Generating Station Retirement PlantAndEquipmentAssociatedWithSchahferGeneratingStationRetirement	903800000	USD
CY2021	us-gaap	Depreciation Depreciation	672100000	USD
CY2020	us-gaap	Depreciation Depreciation	655600000	USD
CY2019	us-gaap	Depreciation Depreciation	612200000	USD
CY2021	nix	Regulatory Deferral Joint Venture RegulatoryDeferralJointVenture	5300000	USD
CY2021	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	49400000	USD
CY2020	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	56700000	USD
CY2019	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	55500000	USD
CY2021Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	181800000	USD
CY2020Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	136400000	USD
CY2021	nix	Capitalized Cloud Computing Amortization CapitalizedCloudComputingAmortization	10000000	USD
CY2020	nix	Capitalized Cloud Computing Amortization CapitalizedCloudComputingAmortization	3400000	USD
CY2019	nix	Capitalized Cloud Computing Amortization CapitalizedCloudComputingAmortization	1600000	USD
CY2021Q4	nix	Capitalized Cloud Computing Gross CapitalizedCloudComputingGross	42400000	USD
CY2020Q4	nix	Capitalized Cloud Computing Gross CapitalizedCloudComputingGross	12700000	USD
CY2021Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	0	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	0	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	0	USD
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	0	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	11000000	USD
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	495600000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	416900000	USD
CY2021	nix	Accretion Recorded As Regulatory Asset Or Liability AccretionRecordedAsRegulatoryAssetOrLiability	16000000.0	USD
CY2020	nix	Accretion Recorded As Regulatory Asset Or Liability AccretionRecordedAsRegulatoryAssetOrLiability	17300000	USD
CY2021	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	23200000	USD
CY2020	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	5500000	USD
CY2021	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	11200000	USD
CY2020	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	13900000	USD
CY2021	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-11200000	USD
CY2020	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	86000000.0	USD
CY2021	nix	Asset Retirement Obligation Other AssetRetirementObligationOther	0	USD
CY2020	nix	Asset Retirement Obligation Other AssetRetirementObligationOther	-16200000	USD
CY2021Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	512400000	USD
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	495600000	USD
CY2021Q4	us-gaap	Regulatory Assets RegulatoryAssets	2492200000	USD
CY2020Q4	us-gaap	Regulatory Assets RegulatoryAssets	1930500000	USD
CY2021Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	206200000	USD
CY2020Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	135700000	USD
CY2021Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	2286000000	USD
CY2020Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1794800000	USD
CY2021Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	1980000000	USD
CY2020Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	2065500000	USD
CY2021Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	137400000	USD
CY2020Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	161300000	USD
CY2021Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	1842600000	USD
CY2020Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	1904200000	USD
CY2021Q4	us-gaap	Remaining Amounts Of Regulatory Assets For Which No Return On Investment During Recovery Period Is Provided RemainingAmountsOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided	1207000000	USD
CY2020Q4	us-gaap	Remaining Amounts Of Regulatory Assets For Which No Return On Investment During Recovery Period Is Provided RemainingAmountsOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided	1260600000	USD
CY2021	us-gaap	Remaining Recovery Period Of Regulatory Assets For Which No Return On Investment During Recovery Period Is Provided1 RemainingRecoveryPeriodOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided1	P48Y
CY2021Q4	nix	Columbia Of Maryland Covid Relief Funds ColumbiaOfMarylandCOVIDReliefFunds	800000	USD
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CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	200000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
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CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	5200000	USD
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	5900000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	11900000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	5200000	USD
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	99200000	USD
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CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	13800000	USD
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CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	148300000	USD
CY2021	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
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CY2021	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.020
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-11700000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.374
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CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.020
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CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	-38400000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depreciation EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation	1.227
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CY2021	us-gaap	Income Tax Reconciliation Nondeductible Expense Impairment Losses IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses	0	USD
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Impairment Losses EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses	0
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Impairment Losses EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses	0
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Impairment Losses IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses	43000000.0	USD
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CY2019	us-gaap	Income Tax Reconciliation Deductions Other IncomeTaxReconciliationDeductionsOther	2500000	USD
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CY2021	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	0	USD
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CY2020	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	0	USD
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CY2019	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-9500000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	-0.019
CY2021	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	1200000	USD
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CY2020	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	2500000	USD
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CY2019	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	0	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0
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CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	117800000	USD
CY2021	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.167
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CY2021Q4	nix	Other Regulatory Assets OtherRegulatoryAssets	308600000	USD
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CY2021Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	2763000000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	2671100000	USD
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CY2021Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	545900000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	608500000	USD
CY2021Q4	nix	Deferred Tax Assets Other Accrued Liabilities Environmental DeferredTaxAssetsOtherAccruedLiabilitiesEnvironmental	22200000	USD
CY2020Q4	nix	Deferred Tax Assets Other Accrued Liabilities Environmental DeferredTaxAssetsOtherAccruedLiabilitiesEnvironmental	22600000	USD
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CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2021Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	111700000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	128400000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	1111400000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	1206900000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	7800000	USD
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CY2021Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	1103600000	USD
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CY2021Q4	nix	Net Asset Value Excluded From Fair Value By Input NetAssetValueExcludedFromFairValueByInput	778800000	USD
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CY2021Q2	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	27000000	USD
CY2021	nix	Equity Units Stock Purchase Contract Liability Payment EquityUnitsStockPurchaseContractLiabilityPayment	41200000	USD
CY2020	nix	Equity Units Stock Purchase Contract Liability Payment EquityUnitsStockPurchaseContractLiabilityPayment	0	USD
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CY2021Q4	us-gaap	Senior Notes SeniorNotes	9003000000	USD
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CY2021Q4	us-gaap	Medium Term Notes MediumTermNotes	132000000.0	USD
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CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	195000000.0	USD
CY2021Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	-79100000	USD
CY2021	nix	Securitization Transaction Fees SecuritizationTransactionFees	1400000	USD
CY2021	nix	Asset Sale Covenant Percentage Of Consolidated Total Assets AssetSaleCovenantPercentageOfConsolidatedTotalAssets	0.15
CY2021Q4	nix	Cross Default Provision On Default Relating To Any Indebtedness CrossDefaultProvisionOnDefaultRelatingToAnyIndebtedness	75000000	USD
CY2021Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	9241500000	USD
CY2020Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	9243100000	USD
CY2020Q3	nix	Debt Instrument Tendered DebtInstrumentTendered	969300000	USD
CY2020Q3	nix	Working Capital Adjustment WorkingCapitalAdjustment	5300000	USD
CY2021	us-gaap	Debt Instrument Convertible Conversion Ratio1 DebtInstrumentConvertibleConversionRatio1	0.574	Rate
CY2021Q4	nix	Security Interest And Other Subset Of Asset SecurityInterestAndOtherSubsetOfAsset	200000000	USD
CY2021	nix	Percentage Of Additional Subset Of Assets Capped PercentageOfAdditionalSubsetOfAssetsCapped	0.10
CY2020Q4	us-gaap	Line Of Credit LineOfCredit	0	USD
CY2021Q4	us-gaap	Line Of Credit LineOfCredit	0	USD
CY2021Q4	us-gaap	Commercial Paper CommercialPaper	560000000	USD
CY2020Q4	us-gaap	Commercial Paper CommercialPaper	503000000	USD
CY2021Q4	us-gaap	Transfers Accounted For As Secured Borrowings Associated Liabilities Carrying Amount TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount	0	USD
CY2021	nix	Cash From Financing Activities Related To Change In Short Term Borrowings Due To Securitization Transactions CashFromFinancingActivitiesRelatedToChangeInShortTermBorrowingsDueToSecuritizationTransactions	0	USD
CY2020	nix	Cash From Financing Activities Related To Change In Short Term Borrowings Due To Securitization Transactions CashFromFinancingActivitiesRelatedToChangeInShortTermBorrowingsDueToSecuritizationTransactions	353200000	USD
CY2020	nix	Securitization Transaction Fees SecuritizationTransactionFees	2600000	USD
CY2019	nix	Securitization Transaction Fees SecuritizationTransactionFees	2600000	USD
CY2021	nix	Lessee Lease Renewal Term LesseeLeaseRenewalTerm	P25Y
CY2021Q4	us-gaap	Lessee Operating Lease Renewal Term LesseeOperatingLeaseRenewalTerm	P1Y
CY2021Q4	us-gaap	Lessee Finance Lease Term Of Contract1 LesseeFinanceLeaseTermOfContract1	P4Y
CY2021	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	28800000	USD
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	23400000	USD
CY2021	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	9400000	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	11100000	USD
CY2021	nix	Finance Lease Cost Total FinanceLeaseCostTotal	38200000	USD
CY2020	nix	Finance Lease Cost Total FinanceLeaseCostTotal	34500000	USD
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	15600000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	20300000	USD
CY2021	us-gaap	Lease Cost LeaseCost	53800000	USD
CY2020	us-gaap	Lease Cost LeaseCost	54800000	USD
CY2021Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	165700000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	176800000	USD
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	33800000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	39900000	USD
CY2021Q4	nix	Totalleasedassets Totalleasedassets	199500000	USD
CY2020Q4	nix	Totalleasedassets Totalleasedassets	216700000	USD
CY2021Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	28100000	USD
CY2020Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	23300000	USD
CY2021Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	6700000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	10300000	USD
CY2021Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	157500000	USD
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	171700000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	29900000	USD
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P11Y2M12D
CY2021Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	27900000	USD
CY2021Q4	nix	Total Lease Liability TotalLeaseLiability	220200000	USD
CY2020Q4	nix	Total Lease Liability TotalLeaseLiability	235200000	USD
CY2021	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	9400000	USD
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	11100000	USD
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	15400000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	20200000	USD
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	25700000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	18400000	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	22400000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	59300000	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	6000000.0	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	10900000	USD
CY2021Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P10Y7M6D
CY2021Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y6M
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y
CY2021Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.050	Rate
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.051	Rate
CY2021Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.037	Rate
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.040	Rate
CY2021Q4	nix	Total Future Minimum Lease Payments Due Next Twelve Months TotalFutureMinimumLeasePaymentsDueNextTwelveMonths	45100000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	37200000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	7900000	USD
CY2021Q4	nix	Total Future Minimum Lease Payments Duein Two Years TotalFutureMinimumLeasePaymentsDueinTwoYears	38500000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	33600000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	4900000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	15800000	USD
CY2021Q4	nix	Total Future Minimum Lease Payments Duein Three Years TotalFutureMinimumLeasePaymentsDueinThreeYears	30200000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	25600000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	4600000	USD
CY2021Q4	nix	Total Future Minimum Lease Payments Duein Four Years TotalFutureMinimumLeasePaymentsDueinFourYears	23200000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	19200000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	4000000.0	USD
CY2021Q4	nix	Total Future Minimum Lease Payments Duein Five Years TotalFutureMinimumLeasePaymentsDueinFiveYears	19600000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	3800000	USD
CY2021Q4	nix	Total Future Minimum Lease Payments Due Thereafter TotalFutureMinimumLeasePaymentsDueThereafter	129100000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	112900000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	16200000	USD
CY2021Q4	nix	Total Future Minimum Lease Payments Due TotalFutureMinimumLeasePaymentsDue	285700000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	244300000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	41400000	USD
CY2021Q4	nix	Undiscounted Excess Amount UndiscountedExcessAmount	65500000	USD
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	1100000	USD
CY2021Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	58700000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	6800000	USD
CY2021Q4	nix	Total Lease Liability TotalLeaseLiability	220200000	USD
CY2021Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	185600000	USD
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	34600000	USD
CY2021Q4	nix	Shortterm Lease Liability ShorttermLeaseLiability	34800000	USD
CY2021Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	28100000	USD
CY2021Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	6700000	USD
CY2021Q4	nix	Longterm Lease Liability LongtermLeaseLiability	185400000	USD
CY2021Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	157500000	USD
CY2021Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	27900000	USD
CY2021Q4	nix	Total Lease Liability TotalLeaseLiability	220200000	USD
CY2021Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	185600000	USD
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	34600000	USD
CY2021Q4	us-gaap	Derivative Assets DerivativeAssets	24400000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities Noncurrent AvailableForSaleSecuritiesDebtSecuritiesNoncurrent	171800000	USD
CY2021Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	196200000	USD
CY2021Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	144200000	USD
CY2021Q4	us-gaap	Financial Liabilities Fair Value Disclosure FinancialLiabilitiesFairValueDisclosure	144200000	USD
CY2020Q4	us-gaap	Derivative Assets DerivativeAssets	13200000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities Noncurrent AvailableForSaleSecuritiesDebtSecuritiesNoncurrent	170900000	USD
CY2020Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	184100000	USD
CY2020Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	222800000	USD
CY2020Q4	us-gaap	Financial Liabilities Fair Value Disclosure FinancialLiabilitiesFairValueDisclosure	222800000	USD
CY2021	nix	Transfersbetween Fair Value Hierarchies TransfersbetweenFairValueHierarchies	0	USD
CY2020	nix	Transfersbetween Fair Value Hierarchies TransfersbetweenFairValueHierarchies	0	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	-200000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	-500000	USD
CY2021Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	169300000	USD
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	3800000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	-200000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	171800000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	163900000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	8000000.0	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	500000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	-500000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	170900000	USD
CY2021	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Period Increase Decrease FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPeriodIncreaseDecrease	0	USD
CY2021Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	9241500000	USD
CY2021Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	10415700000	USD
CY2020Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	9243100000	USD
CY2020Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	11034200000	USD
CY2021Q4	nix	Longterm Debt Future Minimum Payments Due LongtermDebtFutureMinimumPaymentsDue	9135000000	USD
CY2021Q4	nix	Longterm Debt Future Minimum Payments Due Next Twelve Months LongtermDebtFutureMinimumPaymentsDueNextTwelveMonths	30000000.0	USD
CY2021Q4	nix	Longterm Debt Future Minimum Payments Duein Two Years LongtermDebtFutureMinimumPaymentsDueinTwoYears	0	USD
CY2021Q4	nix	Longterm Debt Future Minimum Payments Duein Three Years LongtermDebtFutureMinimumPaymentsDueinThreeYears	0	USD
CY2021Q4	nix	Longterm Debt Future Minimum Payments Duein Four Years LongtermDebtFutureMinimumPaymentsDueinFourYears	1260000000	USD
CY2021Q4	nix	Longterm Debt Future Minimum Payments Duein Five Years LongtermDebtFutureMinimumPaymentsDueinFiveYears	0	USD
CY2021Q4	nix	Longterm Debt Future Minimum Payments Due Thereafter LongtermDebtFutureMinimumPaymentsDueThereafter	7845000000	USD
CY2021Q4	nix	Interest Paymentson Longterm Debt Future Minimum Payments Due InterestPaymentsonLongtermDebtFutureMinimumPaymentsDue	5710000000	USD
CY2021Q4	nix	Interest Paymentson Longterm Debt Future Minimum Payments Due Next Twelve Months InterestPaymentsonLongtermDebtFutureMinimumPaymentsDueNextTwelveMonths	335700000	USD
CY2021Q4	nix	Interest Paymentson Longterm Debt Future Minimum Payments Duein Two Years InterestPaymentsonLongtermDebtFutureMinimumPaymentsDueinTwoYears	334100000	USD
CY2021Q4	nix	Interest Paymentson Longterm Debt Future Minimum Payments Duein Three Years InterestPaymentsonLongtermDebtFutureMinimumPaymentsDueinThreeYears	334100000	USD
CY2021Q4	nix	Interest Paymentson Longterm Debt Future Minimum Payments Duein Four Years InterestPaymentsonLongtermDebtFutureMinimumPaymentsDueinFourYears	334100000	USD
CY2021Q4	nix	Interest Paymentson Longterm Debt Future Minimum Payments Duein Five Years InterestPaymentsonLongtermDebtFutureMinimumPaymentsDueinFiveYears	321600000	USD
CY2021Q4	nix	Interest Paymentson Longterm Debt Future Minimum Payments Due Thereafter InterestPaymentsonLongtermDebtFutureMinimumPaymentsDueThereafter	4050400000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	244300000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	37200000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	33600000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	25600000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	19200000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	15800000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	112900000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	41400000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	7900000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	4900000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	4600000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	4000000.0	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	3800000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	16200000	USD
CY2021Q4	nix	Energy Commodity Contracts Future Minimum Payments Due EnergyCommodityContractsFutureMinimumPaymentsDue	68600000	USD
CY2021Q4	nix	Energy Commodity Contracts Future Minimum Payments Due Next Twelve Months EnergyCommodityContractsFutureMinimumPaymentsDueNextTwelveMonths	60400000	USD
CY2021Q4	nix	Energy Commodity Contracts Future Minimum Payments Duein Two Years EnergyCommodityContractsFutureMinimumPaymentsDueinTwoYears	8200000	USD
CY2021Q4	nix	Energy Commodity Contracts Future Minimum Payments Duein Three Years EnergyCommodityContractsFutureMinimumPaymentsDueinThreeYears	0	USD
CY2021Q4	nix	Energy Commodity Contracts Future Minimum Payments Duein Four Years EnergyCommodityContractsFutureMinimumPaymentsDueinFourYears	0	USD
CY2021Q4	nix	Energy Commodity Contracts Future Minimum Payments Duein Five Years EnergyCommodityContractsFutureMinimumPaymentsDueinFiveYears	0	USD
CY2021Q4	nix	Energy Commodity Contracts Future Minimum Payments Due Thereafter EnergyCommodityContractsFutureMinimumPaymentsDueThereafter	0	USD
CY2021Q4	nix	Service Obligations Pipeline Service Obligations Future Minimum Payments Due ServiceObligationsPipelineServiceObligationsFutureMinimumPaymentsDue	1605000000	USD
CY2021Q4	nix	Service Obligations Pipeline Service Obligations Future Minimum Payments Due Next Twelve Months ServiceObligationsPipelineServiceObligationsFutureMinimumPaymentsDueNextTwelveMonths	610500000	USD
CY2021Q4	nix	Service Obligations Pipeline Service Obligations Future Minimum Payments Duein Two Years ServiceObligationsPipelineServiceObligationsFutureMinimumPaymentsDueinTwoYears	366000000.0	USD
CY2021Q4	nix	Service Obligations Pipeline Service Obligations Future Minimum Payments Duein Three Years ServiceObligationsPipelineServiceObligationsFutureMinimumPaymentsDueinThreeYears	241000000.0	USD
CY2021Q4	nix	Service Obligations Pipeline Service Obligations Future Minimum Payments Duein Four Years ServiceObligationsPipelineServiceObligationsFutureMinimumPaymentsDueinFourYears	136100000	USD
CY2021Q4	nix	Service Obligations Pipeline Service Obligations Future Minimum Payments Duein Five Years ServiceObligationsPipelineServiceObligationsFutureMinimumPaymentsDueinFiveYears	98700000	USD
CY2021Q4	nix	Service Obligations Pipeline Service Obligations Future Minimum Payments Due Thereafter ServiceObligationsPipelineServiceObligationsFutureMinimumPaymentsDueThereafter	152700000	USD
CY2021Q4	nix	Service Obligations It Service Obligations Future Minimum Payments Due ServiceObligationsITServiceObligationsFutureMinimumPaymentsDue	180100000	USD
CY2021Q4	nix	Service Obligations It Service Obligations Future Minimum Payments Due Next Twelve Months ServiceObligationsITServiceObligationsFutureMinimumPaymentsDueNextTwelveMonths	69500000	USD
CY2021Q4	nix	Service Obligations It Service Obligations Future Minimum Payments Duein Two Years ServiceObligationsITServiceObligationsFutureMinimumPaymentsDueinTwoYears	44800000	USD
CY2021Q4	nix	Service Obligations It Service Obligations Future Minimum Payments Duein Three Years ServiceObligationsITServiceObligationsFutureMinimumPaymentsDueinThreeYears	35700000	USD
CY2021Q4	nix	Service Obligations It Service Obligations Future Minimum Payments Duein Four Years ServiceObligationsITServiceObligationsFutureMinimumPaymentsDueinFourYears	27600000	USD
CY2021Q4	nix	Service Obligations It Service Obligations Future Minimum Payments Duein Five Years ServiceObligationsITServiceObligationsFutureMinimumPaymentsDueinFiveYears	2500000	USD
CY2021Q4	nix	Other Liabilities Future Minimum Payments Due Thereafter OtherLiabilitiesFutureMinimumPaymentsDueThereafter	0	USD
CY2021Q4	nix	Service Obligations It Service Obligations Future Minimum Payments Due Thereafter ServiceObligationsITServiceObligationsFutureMinimumPaymentsDueThereafter	0	USD
CY2021Q4	nix	Other Liabilities Future Minimum Payments Due OtherLiabilitiesFutureMinimumPaymentsDue	553000000.0	USD
CY2021Q4	nix	Other Liabilities Future Minimum Payments Due Next Twelve Months OtherLiabilitiesFutureMinimumPaymentsDueNextTwelveMonths	95600000	USD
CY2021Q4	nix	Other Liabilities Future Minimum Payments Duein Two Years OtherLiabilitiesFutureMinimumPaymentsDueinTwoYears	457400000	USD
CY2021Q4	nix	Other Liabilities Future Minimum Payments Duein Three Years OtherLiabilitiesFutureMinimumPaymentsDueinThreeYears	0	USD
CY2021Q4	nix	Other Liabilities Future Minimum Payments Duein Four Years OtherLiabilitiesFutureMinimumPaymentsDueinFourYears	0	USD
CY2021Q4	nix	Other Liabilities Future Minimum Payments Duein Five Years OtherLiabilitiesFutureMinimumPaymentsDueinFiveYears	0	USD
CY2021Q4	nix	Total Future Contractual Obligations Due TotalFutureContractualObligationsDue	17537400000	USD
CY2021Q4	nix	Total Future Contractual Obligations Due Next Twelve Months TotalFutureContractualObligationsDueNextTwelveMonths	1246800000	USD
CY2021Q4	nix	Total Future Contractual Obligations Duein Two Years TotalFutureContractualObligationsDueinTwoYears	1249000000	USD
CY2021Q4	nix	Total Future Contractual Obligations Duein Three Years TotalFutureContractualObligationsDueinThreeYears	641000000.0	USD
CY2021Q4	nix	Total Future Contractual Obligations Duein Four Years TotalFutureContractualObligationsDueinFourYears	1781000000	USD
CY2021Q4	nix	Total Future Contractual Obligations Duein Five Years TotalFutureContractualObligationsDueinFiveYears	442400000	USD
CY2021Q4	nix	Total Future Contractual Obligations Due Thereafter TotalFutureContractualObligationsDueThereafter	12177200000	USD
CY2021Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	-79100000	USD
CY2021Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	58700000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	6800000	USD
CY2021Q4	us-gaap	Other Commitment Due In Next Twelve Months OtherCommitmentDueInNextTwelveMonths	33300000	USD
CY2021Q4	us-gaap	Other Commitment Due In Second Year OtherCommitmentDueInSecondYear	30200000	USD
CY2021Q4	us-gaap	Other Commitment Due In Third Year OtherCommitmentDueInThirdYear	27200000	USD
CY2021Q4	us-gaap	Other Commitment Due In Fourth Year OtherCommitmentDueInFourthYear	24000000	USD
CY2021Q4	us-gaap	Other Commitment Due In Fifth Year OtherCommitmentDueInFifthYear	17000000	USD
CY2021Q4	us-gaap	Other Commitment Due After Fifth Year OtherCommitmentDueAfterFifthYear	16100000	USD
CY2021Q4	nix	Wind Power Purchase Agreement Capacity WindPowerPurchaseAgreementCapacity	500	MW
CY2021Q4	nix	Major Rail Operators MajorRailOperators	3
CY2021Q4	us-gaap	Guarantee Obligations Current Carrying Value GuaranteeObligationsCurrentCarryingValue	288900000	USD
CY2020Q4	us-gaap	Guarantee Obligations Current Carrying Value GuaranteeObligationsCurrentCarryingValue	40700000	USD
CY2021Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	91100000	USD
CY2020Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	92600000	USD
CY2021Q4	nix	Wind Power Purchase Agreement Purchase Percentage WindPowerPurchaseAgreementPurchasePercentage	1	Rate
CY2021Q4	us-gaap	Restructuring And Related Cost Expected Cost1 RestructuringAndRelatedCostExpectedCost1	42000000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-37200000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-55900000	USD
CY2019	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	500000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-55400000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-92600000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-64600000	USD
CY2020	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	500000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-64100000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-156700000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	28400000	USD
CY2021	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	1500000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	29900000	USD
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-126800000	USD
CY2021	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	4000000.0	USD
CY2020	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	5500000	USD
CY2019	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	7700000	USD
CY2021	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	13100000	USD
CY2020	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	9900000	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	8000000.0	USD
CY2021	nix	Charitable Contributions CharitableContributions	-11500000	USD
CY2020	nix	Charitable Contributions CharitableContributions	-1500000	USD
CY2019	nix	Charitable Contributions CharitableContributions	-5100000	USD
CY2021	nix	Pensionand Other Postretirement Non Service Cost PensionandOtherPostretirementNonServiceCost	35500000	USD
CY2020	nix	Pensionand Other Postretirement Non Service Cost PensionandOtherPostretirementNonServiceCost	9300000	USD
CY2019	nix	Pensionand Other Postretirement Non Service Cost PensionandOtherPostretirementNonServiceCost	-16500000	USD
CY2021	nix	Sale Of Emission Reduction Credits SaleOfEmissionReductionCredits	0	USD
CY2020	nix	Sale Of Emission Reduction Credits SaleOfEmissionReductionCredits	4600000	USD
CY2019	nix	Sale Of Emission Reduction Credits SaleOfEmissionReductionCredits	0	USD
CY2021	nix	Miscellaneous Non Operating Income Expense MiscellaneousNonOperatingIncomeExpense	-300000	USD
CY2020	nix	Miscellaneous Non Operating Income Expense MiscellaneousNonOperatingIncomeExpense	4300000	USD
CY2019	nix	Miscellaneous Non Operating Income Expense MiscellaneousNonOperatingIncomeExpense	700000	USD
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	40800000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	32100000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-5200000	USD
CY2021	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	336400000	USD
CY2020	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	354200000	USD
CY2019	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	327700000	USD
CY2021	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	600000	USD
CY2020	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	14700000	USD
CY2019	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	50800000	USD
CY2021	nix	Discount On Prepayment Transaction DiscountOnPrepaymentTransaction	11000000.0	USD
CY2020	nix	Discount On Prepayment Transaction DiscountOnPrepaymentTransaction	9100000	USD
CY2019	nix	Discount On Prepayment Transaction DiscountOnPrepaymentTransaction	8300000	USD
CY2021	nix	Securitization Transaction Fees SecuritizationTransactionFees	1400000	USD
CY2020	nix	Securitization Transaction Fees SecuritizationTransactionFees	2600000	USD
CY2019	nix	Securitization Transaction Fees SecuritizationTransactionFees	2600000	USD
CY2021	nix	Allowance For Borrowed Funds Used And Interest Capitalized During Construction AllowanceForBorrowedFundsUsedAndInterestCapitalizedDuringConstruction	4600000	USD
CY2020	nix	Allowance For Borrowed Funds Used And Interest Capitalized During Construction AllowanceForBorrowedFundsUsedAndInterestCapitalizedDuringConstruction	7000000.0	USD
CY2019	nix	Allowance For Borrowed Funds Used And Interest Capitalized During Construction AllowanceForBorrowedFundsUsedAndInterestCapitalizedDuringConstruction	7500000	USD
CY2021	nix	Debtbasedpostinservicecarryingcharges Debtbasedpostinservicecarryingcharges	14700000	USD
CY2020	nix	Debtbasedpostinservicecarryingcharges Debtbasedpostinservicecarryingcharges	14600000	USD
CY2019	nix	Debtbasedpostinservicecarryingcharges Debtbasedpostinservicecarryingcharges	18700000	USD
CY2021	us-gaap	Interest Expense Other InterestExpenseOther	11000000.0	USD
CY2020	us-gaap	Interest Expense Other InterestExpenseOther	11700000	USD
CY2019	us-gaap	Interest Expense Other InterestExpenseOther	15700000	USD
CY2021	us-gaap	Interest Expense InterestExpense	341100000	USD
CY2020	us-gaap	Interest Expense InterestExpense	370700000	USD
CY2019	us-gaap	Interest Expense InterestExpense	378900000	USD
CY2021	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2
CY2021	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	4899600000	USD
CY2020	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	4681700000	USD
CY2019	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	5208900000	USD
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	1006900000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	550800000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	890700000	USD
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	748400000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	725900000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	717400000	USD
CY2021Q4	us-gaap	Assets Assets	24156900000	USD
CY2020Q4	us-gaap	Assets Assets	22040500000	USD
CY2019Q4	us-gaap	Assets Assets	22659800000	USD
CY2021	nix	Payments To Acquire Property Plant And Equipment Including Captial Expenditures From Current Liabilities And Equity Method Investments PaymentsToAcquirePropertyPlantAndEquipmentIncludingCaptialExpendituresFromCurrentLiabilitiesAndEquityMethodInvestments	1940400000	USD
CY2020	nix	Payments To Acquire Property Plant And Equipment Including Captial Expenditures From Current Liabilities And Equity Method Investments PaymentsToAcquirePropertyPlantAndEquipmentIncludingCaptialExpendituresFromCurrentLiabilitiesAndEquityMethodInvestments	1720800000	USD
CY2019	nix	Payments To Acquire Property Plant And Equipment Including Captial Expenditures From Current Liabilities And Equity Method Investments PaymentsToAcquirePropertyPlantAndEquipmentIncludingCaptialExpendituresFromCurrentLiabilitiesAndEquityMethodInvestments	1867800000	USD
CY2020	us-gaap	Disposal Group Not Discontinued Operation Loss Gain On Write Down DisposalGroupNotDiscontinuedOperationLossGainOnWriteDown	412400000	USD
CY2021	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	245700000	USD
CY2020	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	170400000	USD
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	223600000	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	22400000	USD
CY2020	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	59300000	USD
CY2019	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	26400000	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	6000000.0	USD
CY2020	nix	Noncashor Part Noncash Acquisition Fixed Assets Acquired Operating Lease NoncashorPartNoncashAcquisitionFixedAssetsAcquiredOperatingLease	10900000	USD
CY2019	nix	Noncashor Part Noncash Acquisition Fixed Assets Acquired Operating Lease NoncashorPartNoncashAcquisitionFixedAssetsAcquiredOperatingLease	13400000	USD
CY2021	nix	Reclassificationof Other Propertyto Regulatory Assets ReclassificationofOtherPropertytoRegulatoryAssets	607600000	USD
CY2020	nix	Reclassificationof Other Propertyto Regulatory Assets ReclassificationofOtherPropertytoRegulatoryAssets	0	USD
CY2019	nix	Reclassificationof Other Propertyto Regulatory Assets ReclassificationofOtherPropertytoRegulatoryAssets	0	USD
CY2021	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	12000000.0	USD
CY2020	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	91500000	USD
CY2019	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	54600000	USD
CY2021Q4	nix	Obligation To The Developer ObligationToTheDeveloper	277500000	USD
CY2020Q4	nix	Obligation To The Developer ObligationToTheDeveloper	69700000	USD
CY2019Q4	nix	Obligation To The Developer ObligationToTheDeveloper	0	USD
CY2021Q4	nix	Purchase Contract Liability PurchaseContractLiability	129400000	USD
CY2020Q4	nix	Purchase Contract Liability PurchaseContractLiability	0	USD
CY2019Q4	nix	Purchase Contract Liability PurchaseContractLiability	0	USD
CY2021	us-gaap	Interest Paid Net InterestPaidNet	322400000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	349000000.0	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	349700000	USD
CY2021	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	9400000	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	11100000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	11300000	USD
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	5400000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-1000000.0	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	10800000	USD
CY2021	dei	Auditor Firm AuditorFirmId	34

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$NI
NISOURCE INC. Stock $ni

2021 Q4 Form 10-K Financial Statement

#000111171122000007 Filed on February 23, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NI NISOURCE INC. Stock $ni

2021 Q4 Form 10-K Financial Statement

#000111171122000007 Filed on February 23, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NI
NISOURCE INC. Stock $ni