$NI
NISOURCE INC. Stock $ni

$ni Overview Financials Valuation SEC Filings Company Website

2024 Q1 Form 10-K Financial Statement

#000111171124000011 Filed on February 21, 2024

Income Statement

Concept	2024 Q1	2023 Q4	2023
Revenue	$1.706B	$1.422B	$5.348B
YoY Change	-13.21%	-16.58%	-6.81%
Cost Of Revenue	$425.0M	$335.0M	$1.533B
YoY Change	-44.45%	-51.4%	-27.35%
Gross Profit	$1.281B	$1.087B	$3.972B
YoY Change	6.69%	7.06%	6.2%
Gross Profit Margin	75.09%	76.44%	74.28%
Selling, General & Admin			$11.30M
YoY Change			8.65%
% of Gross Profit			0.28%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$242.1M	$257.3M	$908.2M
YoY Change	17.01%	19.01%	10.65%
% of Gross Profit	18.89%	23.67%	22.86%
Operating Expenses	$697.9M	$721.0M	$2.674B
YoY Change	4.18%	11.15%	3.69%
Operating Profit	$583.4M	$366.0M	$1.296B
YoY Change	9.87%	-0.16%	2.35%
Interest Expense	$116.3M	-$138.3M	$489.6M
YoY Change	6.8%	51.81%	35.4%
% of Operating Profit	19.93%	-37.79%	37.79%
Other Income/Expense, Net	-$107.1M	$3.400M	-$481.6M
YoY Change	-0.28%	-70.43%	55.66%
Pretax Income	$476.3M	$227.7M	$813.9M
YoY Change	12.44%	-20.36%	-14.9%
Income Tax	$76.00M	$35.80M	$139.5M
% Of Pretax Income	15.96%	15.72%	17.14%
Net Earnings	$365.0M	$225.3M	$714.3M
YoY Change	9.61%	-2.38%	-11.17%
Net Earnings / Revenue	21.39%	15.84%	13.36%
Basic Earnings Per Share	$0.77		$1.59
Diluted Earnings Per Share	$0.77	$0.50	$1.48
COMMON SHARES
Basic Shares Outstanding	447.5M shares	413.4M shares	416.1M shares
Diluted Shares Outstanding	449.4M shares		447.9M shares

Balance Sheet

Concept	2024 Q1	2023 Q4	2023
SHORT-TERM ASSETS
Cash & Short-Term Investments	$102.2M	$2.245B	$2.245B
YoY Change	-3.95%	5403.43%	5403.43%
Cash & Equivalents	$102.2M	$2.245B	$2.245B
Short-Term Investments
Other Short-Term Assets	$161.1M	$118.6M	$822.8M
YoY Change	-42.09%	-43.52%	32.37%
Inventory	$323.6M	$503.2M	$503.2M
Prepaid Expenses
Receivables	$845.6M	$862.0M	$862.0M
Other Receivables	$43.20M	$66.00M	$66.00M
Total Short-Term Assets	$2.060B	$4.499B	$4.499B
YoY Change	-11.83%	74.11%	74.11%
LONG-TERM ASSETS
Property, Plant & Equipment	$22.95B	$22.27B	$22.31B
YoY Change	13.44%	12.26%	12.22%
Goodwill	$1.486B	$1.486B
YoY Change	0.0%	0.0%
Intangibles
YoY Change
Long-Term Investments	$242.3M	$247.1M	$247.1M
YoY Change	6.79%	10.21%	10.21%
Other Assets	$4.090B	$4.056B	$2.537B
YoY Change	0.66%	-0.73%	-1.05%
Total Long-Term Assets	$27.28B	$26.58B	$26.58B
YoY Change	11.26%	10.04%	10.04%
TOTAL ASSETS
Total Short-Term Assets	$2.060B	$4.499B	$4.499B
Total Long-Term Assets	$27.28B	$26.58B	$26.58B
Total Assets	$29.34B	$31.08B	$31.08B
YoY Change	9.25%	16.23%	16.23%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$612.5M	$749.4M	$749.4M
YoY Change	-4.62%	-16.69%	-16.69%
Accrued Expenses	$455.5M	$581.1M	$581.1M
YoY Change	-18.92%	-12.83%	-12.83%
Deferred Revenue	$189.5M	$294.4M
YoY Change	-15.96%	-9.33%
Short-Term Debt	$1.222B	$3.049B	$3.049B
YoY Change	-4.63%	73.03%	73.03%
Long-Term Debt Due	$24.00M	$23.80M	$23.80M
YoY Change	-20.79%	-20.67%	-20.67%
Total Short-Term Liabilities	$3.125B	$5.265B	$5.265B
YoY Change	-20.01%	12.97%	12.97%
LONG-TERM LIABILITIES
Long-Term Debt	$11.72B	$11.06B	$11.06B
YoY Change	14.22%	16.09%	16.09%
Other Long-Term Liabilities	$297.7M	$298.6M	$2.540B
YoY Change	-0.27%	0.61%	-9.17%
Total Long-Term Liabilities	$4.694B	$4.620B	$13.60B
YoY Change	0.32%	-0.65%	10.35%
TOTAL LIABILITIES
Total Short-Term Liabilities	$3.125B	$5.265B	$5.265B
Total Long-Term Liabilities	$4.694B	$4.620B	$13.60B
Total Liabilities	$7.819B	$9.885B	$22.81B
YoY Change	-8.93%	6.17%	19.03%
SHAREHOLDERS EQUITY
Retained Earnings	-$861.7M	-$967.0M
YoY Change	-22.7%	-20.32%
Common Stock	$8.891B	$8.884B
YoY Change	20.53%	20.39%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$99.90M	$99.90M
YoY Change	0.0%	0.0%
Treasury Stock Shares
Shareholders Equity	$7.896B	$8.270B	$8.270B
YoY Change
Total Liabilities & Shareholders Equity	$29.34B	$31.08B	$31.08B
YoY Change	9.25%	16.23%	16.23%

Cashflow Statement

Concept	2024 Q1	2023 Q4	2023
OPERATING ACTIVITIES
Net Income	$365.0M	$225.3M	$714.3M
YoY Change	9.61%	-2.38%	-11.17%
Depreciation, Depletion And Amortization	$242.1M	$257.3M	$908.2M
YoY Change	17.01%	19.01%	10.65%
Cash From Operating Activities	$456.2M	$399.2M	$1.935B
YoY Change	-33.25%	6.97%	37.3%
INVESTING ACTIVITIES
Capital Expenditures	$589.5M	$802.3M	$2.646B
YoY Change	5.82%	10.94%	20.09%
Acquisitions
YoY Change
Other Investing Activities	$22.90M	-$266.0M	$3.700M
YoY Change	-31.44%	61.9%	-384.62%
Cash From Investing Activities	-$723.0M	-$1.068B	-$3.572B
YoY Change	-0.66%	20.37%	38.96%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			$12.90M
YoY Change			-91.64%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-$1.874B	2.844B	$3.842B
YoY Change	-1697.44%	456.37%	236.65%
NET CHANGE
Cash From Operating Activities	$456.2M	399.2M	$1.935B
Cash From Investing Activities	-$723.0M	-1.068B	-$3.572B
Cash From Financing Activities	-$1.874B	2.844B	$3.842B
Net Change In Cash	-$2.141B	2.175B	$2.206B
YoY Change	-3036.35%	-68053.13%	-11411.28%
FREE CASH FLOW
Cash From Operating Activities	$456.2M	$399.2M	$1.935B
Capital Expenditures	$589.5M	$802.3M	$2.646B
Free Cash Flow	-$133.3M	-$403.1M	-$710.7M
YoY Change	-205.54%	15.17%	-10.46%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2022	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	1489400000	usd
CY2023	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	908200000	usd
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	820800000	usd
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	748400000	usd
CY2023	nix	Impairment And Gain Loss On Sale Of Assets Net ImpairmentAndGainLossOnSaleOfAssetsNet	2900000	usd
CY2022	nix	Impairment And Gain Loss On Sale Of Assets Net ImpairmentAndGainLossOnSaleOfAssetsNet	-104200000	usd
CY2021	nix	Impairment And Gain Loss On Sale Of Assets Net ImpairmentAndGainLossOnSaleOfAssetsNet	7700000	usd
CY2022Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherLiabilitiesCurrent
CY2023Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherLiabilitiesCurrent
CY2022Q4	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#LongTermDebtAndCapitalLeaseObligations
CY2023	dei	Entity Central Index Key EntityCentralIndexKey	0001111711
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2023	dei	Amendment Flag AmendmentFlag	false
CY2022Q4	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#PublicUtilitiesPropertyPlantAndEquipmentNet
CY2023Q4	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#PublicUtilitiesPropertyPlantAndEquipmentNet
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://www.nisource.com/20231231#DeferredChargesAndOther
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://www.nisource.com/20231231#DeferredChargesAndOther
CY2022Q4	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#LongTermDebtAndCapitalLeaseObligationsCurrent
CY2023Q4	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#LongTermDebtAndCapitalLeaseObligationsCurrent
CY2023Q4	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#LongTermDebtAndCapitalLeaseObligations
CY2022Q4	us-gaap	Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherLiabilitiesNoncurrent
CY2023Q4	us-gaap	Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherLiabilitiesNoncurrent
CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023	dei	Document Period End Date DocumentPeriodEndDate	2023-12-31
CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2023	dei	Document Transition Report DocumentTransitionReport	false
CY2023	dei	Entity File Number EntityFileNumber	001-16189
CY2023	dei	Entity Registrant Name EntityRegistrantName	NiSource Inc.
CY2023	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2023	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	35-2108964
CY2023	dei	Entity Address Address Line1 EntityAddressAddressLine1	801 East 86th Avenue
CY2023	dei	Entity Address City Or Town EntityAddressCityOrTown	Merrillville,
CY2023	dei	Entity Address State Or Province EntityAddressStateOrProvince	IN
CY2023	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	46410
CY2023	dei	City Area Code CityAreaCode	(877)
CY2023	dei	Local Phone Number LocalPhoneNumber	647-5990
CY2023	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2023	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2023	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2023	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2023	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2023	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2023	dei	Entity Small Business EntitySmallBusiness	false
CY2023	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2023	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2023	dei	Entity Shell Company EntityShellCompany	false
CY2023Q2	dei	Entity Public Float EntityPublicFloat	11285281624	usd
CY2024Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	447524529	shares
CY2023	us-gaap	Debt Instrument Convertible Conversion Ratio1 DebtInstrumentConvertibleConversionRatio1	0.582	rate
CY2023	dei	Auditor Name AuditorName	DELOITTE & TOUCHE LLP
CY2023	dei	Auditor Location AuditorLocation	Columbus, Ohio
CY2023	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	5347800000	usd
CY2022	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	5738600000	usd
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4731300000	usd
CY2023	us-gaap	Regulated Operating Revenue Other RegulatedOperatingRevenueOther	157600000	usd
CY2022	us-gaap	Regulated Operating Revenue Other RegulatedOperatingRevenueOther	112000000.0	usd
CY2021	us-gaap	Regulated Operating Revenue Other RegulatedOperatingRevenueOther	168300000	usd
CY2023	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	5505400000	usd
CY2022	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	5850600000	usd
CY2021	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	4899600000	usd
CY2023	us-gaap	Cost Of Goods And Service Excluding Depreciation Depletion And Amortization CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization	1533300000	usd
CY2022	us-gaap	Cost Of Goods And Service Excluding Depreciation Depletion And Amortization CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization	2110500000	usd
CY2021	us-gaap	Cost Of Goods And Service Excluding Depreciation Depletion And Amortization CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization	1392300000	usd
CY2023	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	1494900000	usd
CY2021	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	1456000000	usd
CY2023	us-gaap	Operating Income Loss OperatingIncomeLoss	1295500000	usd
CY2023	us-gaap	Interest Expense InterestExpense	489600000	usd
CY2022	us-gaap	Interest Expense InterestExpense	361600000	usd
CY2023	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	8000000.0	usd
CY2022	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	52200000	usd
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	40800000	usd
CY2023	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-481600000	usd
CY2022	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-309400000	usd
CY2021	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-300300000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	813900000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	956400000	usd
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	706600000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	139500000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	164600000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	117800000	usd
CY2023	us-gaap	Profit Loss ProfitLoss	674400000	usd
CY2022	us-gaap	Profit Loss ProfitLoss	791800000	usd
CY2021	us-gaap	Profit Loss ProfitLoss	588800000	usd
CY2021	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	3900000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	714300000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	804100000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	584900000	usd
CY2023	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	42800000	usd
CY2022	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	55100000	usd
CY2021	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	55100000	usd
CY2023	us-gaap	Preferred Stock Redemption Premium PreferredStockRedemptionPremium	9800000	usd
CY2022	us-gaap	Preferred Stock Redemption Premium PreferredStockRedemptionPremium	0	usd
CY2021	us-gaap	Preferred Stock Redemption Premium PreferredStockRedemptionPremium	0	usd
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	661700000	usd
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	749000000.0	usd
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	529800000	usd
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.59
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.59
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.84
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.84
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.35
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.35
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.48
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.48
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.70
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.70
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.27
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.27
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	416100000	shares
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	407100000	shares
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	393600000	shares
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	393600000	shares
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	447900000	shares
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	442700000	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	417300000	shares
CY2023	us-gaap	Profit Loss ProfitLoss	674400000	usd
CY2022	us-gaap	Profit Loss ProfitLoss	791800000	usd
CY2021	us-gaap	Profit Loss ProfitLoss	588800000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	3900000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-13300000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-3900000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-200000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	109900000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	25400000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	200000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	6900000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-8400000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	3500000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	89700000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	29900000	usd
CY2023	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	677900000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	881500000	usd
CY2021	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	618700000	usd
CY2023	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-1000000	usd
CY2022	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	3500000	usd
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	1000000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent	100000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent	-36400000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent	-8400000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	100000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	2300000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-3800000	usd
CY2023Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	30482100000	usd
CY2022Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	27551300000	usd
CY2023Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	8207200000	usd
CY2022Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	7708700000	usd
CY2023Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	22274900000	usd
CY2022Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	19842600000	usd
CY2023Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	5300000	usd
CY2022Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	1600000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	169000000.0	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	166700000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	600000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	-900000	usd
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CY2022Q4	us-gaap	Available For Sale Securities Debt Securities Noncurrent AvailableForSaleSecuritiesDebtSecuritiesNoncurrent	151600000	usd
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CY2023Q4	us-gaap	Investments And Other Noncurrent Assets InvestmentsAndOtherNoncurrentAssets	247100000	usd
CY2022Q4	us-gaap	Investments And Other Noncurrent Assets InvestmentsAndOtherNoncurrentAssets	224200000	usd
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	2245400000	usd
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	40800000	usd
CY2023Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	35700000	usd
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CY2023Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	884900000	usd
CY2022Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	1065800000	usd
CY2023Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	22900000	usd
CY2022Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	23900000	usd
CY2023Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	862000000.0	usd
CY2022Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1041900000	usd
CY2023Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	265800000	usd
CY2022Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	531700000	usd
CY2023Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	172100000	usd
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CY2023Q4	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	65300000	usd
CY2022Q4	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	68800000	usd
CY2023Q4	nix	Exchange Gas Receivable ExchangeGasReceivable	66000000.0	usd
CY2022Q4	nix	Exchange Gas Receivable ExchangeGasReceivable	128100000	usd
CY2023Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	214300000	usd
CY2022Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	233200000	usd
CY2023Q4	nix	Deposits To Renewable Generation Asset Developer DepositsToRenewableGenerationAssetDeveloper	454200000	usd
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CY2022Q4	us-gaap	Other Assets Current OtherAssetsCurrent	210000000.0	usd
CY2023Q4	us-gaap	Assets Current AssetsCurrent	4499400000	usd
CY2022Q4	us-gaap	Assets Current AssetsCurrent	2584300000	usd
CY2023Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	2245900000	usd
CY2022Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	2347600000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	1485900000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	1485900000	usd
CY2023Q4	nix	Deferred Charges And Other DeferredChargesAndOther	324000000.0	usd
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CY2022Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	4085500000	usd
CY2023Q4	us-gaap	Assets Assets	31077200000	usd
CY2022Q4	us-gaap	Assets Assets	26736600000	usd
CY2022Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2022Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	750000000	shares
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	750000000	shares
CY2023Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	447381671	shares
CY2022Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	412142602	shares
CY2023Q4	us-gaap	Common Stock Value CommonStockValue	4500000	usd
CY2022Q4	us-gaap	Common Stock Value CommonStockValue	4200000	usd
CY2023Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2022Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2022Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	20000000	shares
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CY2023Q4	us-gaap	Preferred Stock Value Outstanding PreferredStockValueOutstanding	486100000	usd
CY2022Q4	us-gaap	Preferred Stock Value Outstanding PreferredStockValueOutstanding	1546500000	usd
CY2023Q4	us-gaap	Treasury Stock Value TreasuryStockValue	99900000	usd
CY2022Q4	us-gaap	Treasury Stock Value TreasuryStockValue	99900000	usd
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CY2022Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	7375300000	usd
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CY2022Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-1213600000	usd
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-33600000	usd
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-37100000	usd
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CY2023Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	10136300000	usd
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CY2023Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	11055500000	usd
CY2022Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	9523600000	usd
CY2023Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	21191800000	usd
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CY2022Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	899500000	usd
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CY2023Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	4620300000	usd
CY2022Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	4650700000	usd
CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	31077200000	usd
CY2022Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	26736600000	usd
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CY2023	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-2900000	usd
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CY2023	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-17900000	usd
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CY2021	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	112900000	usd
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CY2023	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-48300000	usd
CY2022	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-47800000	usd
CY2021	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-30000000.0	usd
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CY2023	us-gaap	Payment Of Financing And Stock Issuance Costs PaymentOfFinancingAndStockIssuanceCosts	30200000	usd
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CY2023	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	2402800000	usd
CY2022	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	21200000	usd
CY2021	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	245100000	usd
CY2023	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	14100000	usd
CY2022	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	6000000.0	usd
CY2021	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	600000	usd
CY2023	us-gaap	Proceeds From Other Equity ProceedsFromOtherEquity	0	usd
CY2022	us-gaap	Proceeds From Other Equity ProceedsFromOtherEquity	0	usd
CY2021	us-gaap	Proceeds From Other Equity ProceedsFromOtherEquity	839900000	usd
CY2023	us-gaap	Proceeds From Issuance Of Preferred Stock And Preference Stock ProceedsFromIssuanceOfPreferredStockAndPreferenceStock	-393900000	usd
CY2022	us-gaap	Proceeds From Issuance Of Preferred Stock And Preference Stock ProceedsFromIssuanceOfPreferredStockAndPreferenceStock	0	usd
CY2021	us-gaap	Proceeds From Issuance Of Preferred Stock And Preference Stock ProceedsFromIssuanceOfPreferredStockAndPreferenceStock	0	usd
CY2023	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	413500000	usd
CY2022	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	381500000	usd
CY2021	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	345200000	usd
CY2022	us-gaap	Preferred Stock Redemption Premium PreferredStockRedemptionPremium	0	usd
CY2021	us-gaap	Preferred Stock Redemption Premium PreferredStockRedemptionPremium	0	usd
CY2023	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	43800000	usd
CY2022	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	55100000	usd
CY2021	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	55100000	usd
CY2023	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-66600000	usd
CY2022	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-66100000	usd
CY2021	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-40500000	usd
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	3842200000	usd
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1141300000	usd
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	956300000	usd
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	2205700000	usd
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-19500000	usd
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-30700000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	75400000	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
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2281100000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	75400000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	94900000	usd
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	2245400000	usd
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	40800000	usd
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	84200000	usd
CY2023Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	35700000	usd
CY2022Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	34600000	usd
CY2021Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	10700000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2281100000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	75400000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	94900000	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	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	236700000	usd
CY2021	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	600000	usd
CY2021	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	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
CY2022	us-gaap	Profit Loss ProfitLoss	791800000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	89700000	usd
CY2022	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.94
CY2022	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	381700000	usd
CY2022	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	55100000	usd
CY2022	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	19100000	usd
CY2022	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	6000000.0	usd
CY2022	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	5200000	usd
CY2022	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	14300000	usd
CY2022	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	9700000	usd
CY2022	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	141900000	usd
CY2022Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7901800000	usd
CY2023	us-gaap	Profit Loss ProfitLoss	674400000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	3500000	usd
CY2023	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.00
CY2023	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	414100000	usd
CY2023	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	43800000	usd
CY2023	us-gaap	Proceeds From Payments To Minority Shareholders ProceedsFromPaymentsToMinorityShareholders	2170700000	usd
CY2023	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	233200000	usd
CY2023	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	14100000	usd
CY2023	nix	Stock Issued During The Period Equity Units Value StockIssuedDuringThePeriodEquityUnitsValue	0	usd
CY2023	nix	Preferred Stock Redemption PreferredStockRedemption	393900000	usd
CY2023	us-gaap	Preferred Stock Redemption Premium PreferredStockRedemptionPremium	9800000	usd
CY2023	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	5900000	usd
CY2023	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	12600000	usd
CY2023	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	9900000	usd
CY2023Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	10136300000	usd
CY2020Q4	us-gaap	Shares Issued SharesIssued	391760000	shares
CY2021	nix	Stock Issued Redeemed During The Period Shares Equity Units StockIssuedRedeemedDuringThePeriodSharesEquityUnits	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
CY2022	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	186000	shares
CY2022	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	375000	shares
CY2022	us-gaap	Stock Issued During Period Shares Employee Benefit Plan StockIssuedDuringPeriodSharesEmployeeBenefitPlan	337000	shares
CY2022	us-gaap	Stock Issued During Period Shares Other StockIssuedDuringPeriodSharesOther	5942000	shares
CY2022Q4	us-gaap	Shares Issued SharesIssued	412143000	shares
CY2023	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	216000	shares
CY2023	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	758000	shares
CY2023	us-gaap	Stock Issued During Period Shares Employee Benefit Plan StockIssuedDuringPeriodSharesEmployeeBenefitPlan	366000	shares
CY2023	nix	Stock Issued Redeemed During The Period Shares Equity Units StockIssuedRedeemedDuringThePeriodSharesEquityUnits	33899000	shares
CY2023	us-gaap	Stock Issued During Period Shares Other StockIssuedDuringPeriodSharesOther	0	shares
CY2023Q4	us-gaap	Shares Issued SharesIssued	447382000	shares
CY2023	nix	Number Of Customers NumberOfCustomers	3800000
CY2023	us-gaap	Use Of Estimates UseOfEstimates	Use of Estimates. <span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">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.</span>
CY2023	us-gaap	Impairment Of Investments ImpairmentOfInvestments	0	usd
CY2022	us-gaap	Impairment Of Investments ImpairmentOfInvestments	0	usd
CY2021	us-gaap	Impairment Of Investments ImpairmentOfInvestments	0	usd
CY2023	nix	Pre Tax Rate For Allowance For Funds Used During Construction PreTaxRateForAllowanceForFundsUsedDuringConstruction	0.039
CY2022	nix	Pre Tax Rate For Allowance For Funds Used During Construction PreTaxRateForAllowanceForFundsUsedDuringConstruction	0.034
CY2021	nix	Pre Tax Rate For Allowance For Funds Used During Construction PreTaxRateForAllowanceForFundsUsedDuringConstruction	0.033
CY2023Q4	us-gaap	Lifo Inventory Amount LIFOInventoryAmount	43900000	usd
CY2022Q4	us-gaap	Lifo Inventory Amount LIFOInventoryAmount	43000000	usd
CY2023Q4	us-gaap	Excess Of Replacement Or Current Costs Over Stated Lifo Value ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue	22500000	usd
CY2022Q4	us-gaap	Excess Of Replacement Or Current Costs Over Stated Lifo Value ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue	7700000	usd
CY2023Q4	us-gaap	Weighted Average Cost Inventory Amount WeightedAverageCostInventoryAmount	222000000	usd
CY2022Q4	us-gaap	Weighted Average Cost Inventory Amount WeightedAverageCostInventoryAmount	488700000	usd
CY2023Q3	us-gaap	Payments To Acquire Assets Investing Activities PaymentsToAcquireAssetsInvestingActivities	307200000	usd
CY2023	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	389200000	usd
CY2023Q4	nix	Wind Power Purchase Agreement Purchase Percentage WindPowerPurchaseAgreementPurchasePercentage	1	rate
CY2023	nix	Service Area By County ServiceAreaByCounty	20
CY2023	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	5347800000	usd
CY2023	us-gaap	Regulated Operating Revenue Other RegulatedOperatingRevenueOther	157600000	usd
CY2023	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	5505400000	usd
CY2022	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	5738600000	usd
CY2022	us-gaap	Regulated Operating Revenue Other RegulatedOperatingRevenueOther	112000000.0	usd
CY2022	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	5850600000	usd
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4731300000	usd
CY2021	us-gaap	Regulated Operating Revenue Other RegulatedOperatingRevenueOther	168300000	usd
CY2021	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	4899600000	usd
CY2022Q4	nix	Customer Accounts Receivable Billed Less Reserve CustomerAccountsReceivableBilledLessReserve	560500000	usd
CY2022Q4	nix	Customer Accounts Receivable Unbilled Less Reserve CustomerAccountsReceivableUnbilledLessReserve	453000000.0	usd
CY2023Q4	nix	Customer Accounts Receivable Billed Less Reserve CustomerAccountsReceivableBilledLessReserve	479400000	usd
CY2023Q4	nix	Customer Accounts Receivable Unbilled Less Reserve CustomerAccountsReceivableUnbilledLessReserve	337600000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	23900000	usd
CY2023	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	39800000	usd
CY2023	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	61600000	usd
CY2023	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	20800000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	22900000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	23500000	usd
CY2022	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	36000000.0	usd
CY2022	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	57400000	usd
CY2022	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	21800000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	23900000	usd
CY2023Q4	nix	Wind Power Purchase Agreement Purchase Percentage WindPowerPurchaseAgreementPurchasePercentage	1	rate
CY2023Q2	us-gaap	Business Combination Price Of Acquisition Expected BusinessCombinationPriceOfAcquisitionExpected	2150000000	usd
CY2023	us-gaap	Proceeds From Contributed Capital ProceedsFromContributedCapital	2160000000	usd
CY2023	us-gaap	Proceeds From Contributed Capital ProceedsFromContributedCapital	2160000000	usd
CY2023Q4	us-gaap	Redeemable Noncontrolling Interest Equity Other Carrying Amount RedeemableNoncontrollingInterestEquityOtherCarryingAmount	1360000000	usd
CY2023Q4	us-gaap	Business Acquisition Cost Of Acquired Entity Transaction Costs BusinessAcquisitionCostOfAcquiredEntityTransactionCosts	54700000	usd
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	661700000	usd
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	749000000.0	usd
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	529800000	usd
CY2023	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	600000	usd
CY2022	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	0	usd
CY2021	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	0	usd
CY2023	us-gaap	Net Income Loss From Continuing Operations Available To Common Shareholders Basic NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersBasic	661100000	usd
CY2022	us-gaap	Net Income Loss From Continuing Operations Available To Common Shareholders Basic NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersBasic	749000000.0	usd
CY2021	us-gaap	Net Income Loss From Continuing Operations Available To Common Shareholders Basic NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersBasic	529800000	usd
CY2023	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	1400000	usd
CY2022	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	2000000.0	usd
CY2021	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	1600000	usd
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	662500000	usd
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	751000000.0	usd
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	531400000	usd
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	416100000	shares
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	407100000	shares
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	393600000	shares
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	393600000	shares
CY2023	nix	Incremental Common Shares Attributable To Dilutive Effect Of Equity Unit Purchase Agreements If Converted IncrementalCommonSharesAttributableToDilutiveEffectOfEquityUnitPurchaseAgreementsIfConverted	29800000	shares
CY2022	nix	Incremental Common Shares Attributable To Dilutive Effect Of Equity Unit Purchase Agreements If Converted IncrementalCommonSharesAttributableToDilutiveEffectOfEquityUnitPurchaseAgreementsIfConverted	30200000	shares
CY2021	nix	Incremental Common Shares Attributable To Dilutive Effect Of Equity Unit Purchase Agreements If Converted IncrementalCommonSharesAttributableToDilutiveEffectOfEquityUnitPurchaseAgreementsIfConverted	22000000.0	shares
CY2023	us-gaap	Incremental Common Shares Attributable To Equity Unit Purchase Agreements IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements	900000	shares
CY2022	us-gaap	Incremental Common Shares Attributable To Equity Unit Purchase Agreements IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements	3200000	shares
CY2021	us-gaap	Incremental Common Shares Attributable To Equity Unit Purchase Agreements IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements	0	shares
CY2023	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	700000	shares
CY2022	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	900000	shares
CY2021	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	800000	shares
CY2023	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	400000	shares
CY2022	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	500000	shares
CY2021	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	300000	shares
CY2023	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	0	shares
CY2022	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	800000	shares
CY2021	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	600000	shares
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	447900000	shares
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	442700000	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	417300000	shares
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.59
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.59
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.84
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.84
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.35
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.35
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.48
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.48
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.70
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.70
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.27
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.27
CY2021Q1	nix	Common Stock Aggregate Sale Price CommonStockAggregateSalePrice	750000000	usd
CY2023	us-gaap	Preferred Stock Redemption Premium PreferredStockRedemptionPremium	9800000	usd
CY2023	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	3600000	usd
CY2023Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2021Q2	nix	Net Process From Sale NetProcessFromSale	835500000	usd
CY2021Q2	nix	Net Process From Sale NetProcessFromSale	835500000	usd
CY2021Q2	nix	Purchase Contract Liability PurchaseContractLiability	168800000	usd
CY2021Q2	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	27000000	usd
CY2023Q4	nix	Purchase Contract Liability PurchaseContractLiability	0	usd
CY2022Q4	nix	Purchase Contract Liability PurchaseContractLiability	65000000	usd
CY2022	nix	Equity Units Stock Purchase Contract Liability Payment EquityUnitsStockPurchaseContractLiabilityPayment	66800000	usd
CY2023	us-gaap	Proceeds From Contributed Capital ProceedsFromContributedCapital	2160000000	usd
CY2023Q4	us-gaap	Business Acquisition Cost Of Acquired Entity Transaction Costs BusinessAcquisitionCostOfAcquiredEntityTransactionCosts	54700000	usd
CY2022Q4	us-gaap	Line Of Credit LineOfCredit	0	usd
CY2023Q4	us-gaap	Line Of Credit LineOfCredit	0	usd
CY2023Q4	us-gaap	Commercial Paper CommercialPaper	1061000000	usd
CY2022Q4	us-gaap	Commercial Paper CommercialPaper	415000000	usd
CY2023Q4	us-gaap	Transfers Accounted For As Secured Borrowings Associated Liabilities Carrying Amount TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount	337600000	usd
CY2022Q4	us-gaap	Transfers Accounted For As Secured Borrowings Associated Liabilities Carrying Amount TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount	347200000	usd
CY2023	nix	Cash From Financing Activities Related To Change In Short Term Borrowings Due To Securitization Transactions CashFromFinancingActivitiesRelatedToChangeInShortTermBorrowingsDueToSecuritizationTransactions	9600000	usd
CY2022	nix	Cash From Financing Activities Related To Change In Short Term Borrowings Due To Securitization Transactions CashFromFinancingActivitiesRelatedToChangeInShortTermBorrowingsDueToSecuritizationTransactions	347200000	usd
CY2023	nix	Securitization Transaction Fees SecuritizationTransactionFees	2700000	usd
CY2022	nix	Securitization Transaction Fees SecuritizationTransactionFees	2500000	usd
CY2021	nix	Securitization Transaction Fees SecuritizationTransactionFees	1400000	usd
CY2022Q4	us-gaap	Termination Loans TerminationLoans	1000000000	usd
CY2022Q4	us-gaap	Termination Loans TerminationLoans	1000000000	usd
CY2022Q4	us-gaap	Termination Loans TerminationLoans	1000000000	usd
CY2023Q4	us-gaap	Termination Loans TerminationLoans	1000000000	usd
CY2023Q4	us-gaap	Debt Instrument Interest Rate Stated Percentage DebtInstrumentInterestRateStatedPercentage	0.0641
CY2022Q4	us-gaap	Debt Instrument Interest Rate Stated Percentage DebtInstrumentInterestRateStatedPercentage	0.0537
CY2023Q4	us-gaap	Termination Loans TerminationLoans	250000000	usd
CY2023Q4	us-gaap	Termination Loans TerminationLoans	400000000	usd
CY2023Q4	us-gaap	Termination Loans TerminationLoans	250000000	usd
CY2023Q4	us-gaap	Termination Loans TerminationLoans	400000000	usd
CY2023Q4	nix	Second Term Credit Agreement SecondTermCreditAgreement	650000000	usd
CY2023Q4	nix	Second Tca Debt Interest Rate SecondTCADebtInterestRate	0.0650
CY2023Q4	us-gaap	Senior Notes SeniorNotes	10853000000	usd
CY2022Q4	us-gaap	Senior Notes SeniorNotes	9353000000	usd
CY2023Q4	us-gaap	Medium Term Notes MediumTermNotes	102000000.0	usd
CY2022Q4	us-gaap	Medium Term Notes MediumTermNotes	102000000.0	usd
CY2023Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	205400000	usd
CY2022Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	174700000	usd
CY2023Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	-81100000	usd
CY2022Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	-76100000	usd
CY2023Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	11079300000	usd
CY2022Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	9553600000	usd
CY2023	us-gaap	Debt Instrument Convertible Conversion Ratio1 DebtInstrumentConvertibleConversionRatio1	0.582	rate
CY2023Q4	nix	Security Interest And Other Subset Of Asset SecurityInterestAndOtherSubsetOfAsset	200000000	usd
CY2023	nix	Asset Sale Covenant Percentage Of Consolidated Total Assets AssetSaleCovenantPercentageOfConsolidatedTotalAssets	0.15
CY2023	nix	Revolving Credit Percentage Requirement In Nipsco RevolvingCreditPercentageRequirementInNIPSCO	0.70
CY2023Q4	nix	Cross Default Provision On Default Relating To Any Indebtedness CrossDefaultProvisionOnDefaultRelatingToAnyIndebtedness	75000000	usd
CY2023	nix	Percentage Of Additional Subset Of Assets Capped PercentageOfAdditionalSubsetOfAssetsCapped	0.10
CY2023Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	30482100000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	27551300000	usd
CY2023Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	8207200000	usd
CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	7708700000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	22274900000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	19842600000	usd
CY2023	us-gaap	Depreciation Depreciation	756900000	usd
CY2022	us-gaap	Depreciation Depreciation	685000000	usd
CY2021	us-gaap	Depreciation Depreciation	672100000	usd
CY2023	nix	Regulatory Deferral Joint Venture RegulatoryDeferralJointVenture	12500000	usd
CY2022	nix	Regulatory Deferral Joint Venture RegulatoryDeferralJointVenture	11000000	usd
CY2021	nix	Regulatory Deferral Joint Venture RegulatoryDeferralJointVenture	5300000	usd
CY2023	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	77500000	usd
CY2022	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	53100000	usd
CY2021	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	49400000	usd
CY2023Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	205600000	usd
CY2022Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	190100000	usd
CY2023	nix	Capitalized Cloud Computing Amortization CapitalizedCloudComputingAmortization	12600000	usd
CY2022	nix	Capitalized Cloud Computing Amortization CapitalizedCloudComputingAmortization	11100000	usd
CY2021	nix	Capitalized Cloud Computing Amortization CapitalizedCloudComputingAmortization	10000000	usd
CY2023Q4	nix	Capitalized Cloud Computing Gross CapitalizedCloudComputingGross	32200000	usd
CY2022Q4	nix	Capitalized Cloud Computing Gross CapitalizedCloudComputingGross	45700000	usd
CY2022Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	513500000	usd
CY2021Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	512400000	usd
CY2023	nix	Accretion Recorded As Regulatory Asset Or Liability AccretionRecordedAsRegulatoryAssetOrLiability	20000000.0	usd
CY2022	nix	Accretion Recorded As Regulatory Asset Or Liability AccretionRecordedAsRegulatoryAssetOrLiability	17100000	usd
CY2023	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	23500000	usd
CY2022	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	9500000	usd
CY2023	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	41600000	usd
CY2022	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	22300000	usd
CY2023	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	37600000	usd
CY2022	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-3200000	usd
CY2023Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	553000000.0	usd
CY2022Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	513500000	usd
CY2023Q4	us-gaap	Regulatory Assets RegulatoryAssets	2460200000	usd
CY2022Q4	us-gaap	Regulatory Assets RegulatoryAssets	2580800000	usd
CY2023Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	214300000	usd
CY2022Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	233200000	usd
CY2023Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	2245900000	usd
CY2022Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	2347600000	usd
CY2023Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	1789300000	usd
CY2022Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	2012600000	usd
CY2023Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	278600000	usd
CY2022Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	236800000	usd
CY2023Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	1510700000	usd
CY2022Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	1775800000	usd
CY2023Q4	us-gaap	Remaining Amounts Of Regulatory Assets For Which No Return On Investment During Recovery Period Is Provided RemainingAmountsOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided	716400000	usd
CY2022Q4	us-gaap	Remaining Amounts Of Regulatory Assets For Which No Return On Investment During Recovery Period Is Provided RemainingAmountsOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided	1324700000	usd
CY2023Q4	us-gaap	Remaining Recovery Period Of Regulatory Assets For Which No Return On Investment During Recovery Period Is Provided1 RemainingRecoveryPeriodOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided1	P69Y
CY2023Q4	us-gaap	Derivative Asset After Offset Subject To Master Netting Arrangement DerivativeAssetAfterOffsetSubjectToMasterNettingArrangement	13900000	usd
CY2022Q4	us-gaap	Derivative Asset After Offset Subject To Master Netting Arrangement DerivativeAssetAfterOffsetSubjectToMasterNettingArrangement	81800000	usd
CY2023Q4	nix	Limitof Gca Volumes LimitofGCAVolumes	0.20
CY2023Q4	nix	Customer Annual Demand CustomerAnnualDemand	0.20
CY2023Q4	us-gaap	Derivative Assets DerivativeAssets	23300000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities Noncurrent AvailableForSaleSecuritiesDebtSecuritiesNoncurrent	159100000	usd
CY2023Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	182400000	usd
CY2023Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	9400000	usd
CY2023Q4	us-gaap	Financial Liabilities Fair Value Disclosure FinancialLiabilitiesFairValueDisclosure	9400000	usd
CY2022Q4	us-gaap	Derivative Assets DerivativeAssets	84800000	usd
CY2022Q4	us-gaap	Available For Sale Securities Debt Securities Noncurrent AvailableForSaleSecuritiesDebtSecuritiesNoncurrent	151600000	usd
CY2022Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	236400000	usd
CY2022Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	3000000.0	usd
CY2022Q4	us-gaap	Financial Liabilities Fair Value Disclosure FinancialLiabilitiesFairValueDisclosure	3000000.0	usd
CY2022	nix	Transfersbetween Fair Value Hierarchies TransfersbetweenFairValueHierarchies	0	usd
CY2023	nix	Transfersbetween Fair Value Hierarchies TransfersbetweenFairValueHierarchies	0	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	600000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	-900000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	169000000.0	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	800000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	10100000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	600000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	159100000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	166700000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	0	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	14200000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	-900000	usd
CY2022Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	151600000	usd
CY2023	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	-1000000	usd
CY2023	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Period Increase Decrease FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPeriodIncreaseDecrease	0	usd
CY2023Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	11079300000	usd
CY2023Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	10370900000	usd
CY2022Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	9553600000	usd
CY2022Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	8479400000	usd
CY2023	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	usd
CY2022	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	400000	usd
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-100000	usd
CY2023	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	5300000	usd
CY2022	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	7300000	usd
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	6000000.0	usd
CY2023	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	5300000	usd
CY2022	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	7700000	usd
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	5900000	usd
CY2023	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	22500000	usd
CY2022	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-23000000.0	usd
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	13800000	usd
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	135200000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	158000000.0	usd
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	113000000.0	usd
CY2023	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-1000000.0	usd
CY2022	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-1100000	usd
CY2021	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-1100000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	139500000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	164600000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	117800000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	813900000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	956400000	usd
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	706600000	usd
CY2023	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	170800000	usd
CY2023	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2022	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	200800000	usd
CY2022	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
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
CY2023	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	13700000	usd
CY2023	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.017
CY2022	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	4500000	usd
CY2022	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.005
CY2021	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	14100000	usd
CY2021	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.020
CY2023	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	-38200000	usd
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depreciation EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation	0.047
CY2022	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	-38500000	usd
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depreciation EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation	0.040
CY2021	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	-39100000	usd
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depreciation EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation	0.055
CY2023	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	0	usd
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0
CY2022	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	300000	usd
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0
CY2021	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	0	usd
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0
CY2023	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	1300000	usd
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	0.002
CY2022	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	1200000	usd
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	0.001
CY2021	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	1200000	usd
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	0.002
CY2023	nix	Effective Income Tax Rate Reconciliation Tax Accrual Adjustments Amount EffectiveIncomeTaxRateReconciliationTaxAccrualAdjustmentsAmount	0	usd
CY2023	nix	Effective Income Tax Rate Reconciliation Tax Accrual Adjustments Percent EffectiveIncomeTaxRateReconciliationTaxAccrualAdjustmentsPercent	0
CY2022	nix	Effective Income Tax Rate Reconciliation Tax Accrual Adjustments Amount EffectiveIncomeTaxRateReconciliationTaxAccrualAdjustmentsAmount	200000	usd
CY2022	nix	Effective Income Tax Rate Reconciliation Tax Accrual Adjustments Percent EffectiveIncomeTaxRateReconciliationTaxAccrualAdjustmentsPercent	0
CY2021	nix	Effective Income Tax Rate Reconciliation Tax Accrual Adjustments Amount EffectiveIncomeTaxRateReconciliationTaxAccrualAdjustmentsAmount	-100000	usd
CY2021	nix	Effective Income Tax Rate Reconciliation Tax Accrual Adjustments Percent EffectiveIncomeTaxRateReconciliationTaxAccrualAdjustmentsPercent	0
CY2023	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	4900000	usd
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.006
CY2022	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	2300000	usd
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.002
CY2021	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	2100000	usd
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.003
CY2023	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-600000	usd
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.001
CY2022	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	800000	usd
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0
CY2021	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-2100000	usd
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.003
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	139500000	usd
CY2023	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.171
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	164600000	usd
CY2022	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.172
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	117800000	usd
CY2021	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.167
CY2023	nix	Increase Decrease In Tax Expense IncreaseDecreaseInTaxExpense	25100000	usd
CY2022	nix	Increase Decrease In Tax Expense IncreaseDecreaseInTaxExpense	46800000	usd
CY2023Q4	nix	Accelerated Depreciation And Other Property Differences AcceleratedDepreciationAndOtherPropertyDifferences	1384800000	usd
CY2022Q4	nix	Accelerated Depreciation And Other Property Differences AcceleratedDepreciationAndOtherPropertyDifferences	2473600000	usd
CY2023Q4	nix	Partnership Basis Differences PartnershipBasisDifferences	1241900000	usd
CY2022Q4	nix	Partnership Basis Differences PartnershipBasisDifferences	54300000	usd
CY2023Q4	nix	Other Regulatory Assets OtherRegulatoryAssets	212100000	usd
CY2022Q4	nix	Other Regulatory Assets OtherRegulatoryAssets	348400000	usd
CY2023Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	2838800000	usd
CY2022Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	2876300000	usd
CY2023Q4	nix	Deferred Investment Tax Credits And Other Regulatory Liabilities DeferredInvestmentTaxCreditsAndOtherRegulatoryLiabilities	182200000	usd
CY2022Q4	nix	Deferred Investment Tax Credits And Other Regulatory Liabilities DeferredInvestmentTaxCreditsAndOtherRegulatoryLiabilities	294300000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	58600000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	124700000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	422900000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	491000000.0	usd
CY2023Q4	nix	Deferred Tax Assets Other Accrued Liabilities Environmental DeferredTaxAssetsOtherAccruedLiabilitiesEnvironmental	10100000	usd
CY2022Q4	nix	Deferred Tax Assets Other Accrued Liabilities Environmental DeferredTaxAssetsOtherAccruedLiabilitiesEnvironmental	20700000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	40300000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	55900000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	50700000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	43000000.0	usd
CY2023Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	764800000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	1029600000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	6400000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	7800000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	758400000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	1021800000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	2080400000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1854500000	usd
CY2023	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	458600000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	6400000	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	21700000	usd
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	21700000	usd
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	21700000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	usd
CY2022	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	usd
CY2021	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	usd
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	usd
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	usd
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	21700000	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	21700000	usd
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	21700000	usd
CY2023Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	21700000	usd
CY2022Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	21700000	usd
CY2021Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	21700000	usd
CY2023Q4	nix	Unrecognized Tax Benefits Netof Refundsand Net Operating Loss Carryforwards UnrecognizedTaxBenefitsNetofRefundsandNetOperatingLossCarryforwards	0	usd
CY2022Q4	nix	Unrecognized Tax Benefits Netof Refundsand Net Operating Loss Carryforwards UnrecognizedTaxBenefitsNetofRefundsandNetOperatingLossCarryforwards	0	usd
CY2021Q4	nix	Unrecognized Tax Benefits Netof Refundsand Net Operating Loss Carryforwards UnrecognizedTaxBenefitsNetofRefundsandNetOperatingLossCarryforwards	0	usd
CY2023Q4	nix	Net Asset Value Excluded From Fair Value By Input NetAssetValueExcludedFromFairValueByInput	607800000	usd
CY2023Q4	us-gaap	Fair Value Investments Entities That Calculate Net Asset Value Per Share Unfunded Committments FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments	11600000	usd
CY2022Q4	nix	Net Asset Value Excluded From Fair Value By Input NetAssetValueExcludedFromFairValueByInput	607500000	usd
CY2022Q4	us-gaap	Fair Value Investments Entities That Calculate Net Asset Value Per Share Unfunded Committments FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments	11600000	usd
CY2023Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	231300000	usd
CY2022Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	223100000	usd
CY2020Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	10000000	shares
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	8023671	shares
CY2023	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	23900000	usd
CY2022	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	19000000	usd
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	16700000	usd
CY2023	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	7700000	usd
CY2022	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	3600000	usd
CY2021	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4000000	usd
CY2023	us-gaap	Employee Service Share Based Compensation Tax Benefit From Exercise Of Stock Options EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions	2900000	usd
CY2022	nix	Excess Tax Expense Share Based Compensation ExcessTaxExpenseShareBasedCompensation	400000	usd
CY2023Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	20800000	usd
CY2023	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y7M6D
CY2023	nix	Rtsr Modifier RTSRModifier	0.25	rate
CY2023	nix	Rtsr Modifier RTSRModifier	0.25	rate
CY2023	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.045
CY2023	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	50700000	usd
CY2022	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	39100000	usd
CY2021	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	39100000	usd
CY2023	nix	Lessee Lease Renewal Term LesseeLeaseRenewalTerm	P35Y
CY2023Q4	us-gaap	Lessee Operating Lease Renewal Term LesseeOperatingLeaseRenewalTerm	P1Y
CY2023	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	32000000.0	usd
CY2022	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	31900000	usd
CY2023	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	8600000	usd
CY2022	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	8500000	usd
CY2023	nix	Finance Lease Cost Total FinanceLeaseCostTotal	40600000	usd
CY2022	nix	Finance Lease Cost Total FinanceLeaseCostTotal	40400000	usd
CY2023	us-gaap	Operating Lease Cost OperatingLeaseCost	11300000	usd
CY2022	us-gaap	Operating Lease Cost OperatingLeaseCost	10400000	usd
CY2023	us-gaap	Lease Cost LeaseCost	51900000	usd
CY2022	us-gaap	Lease Cost LeaseCost	50800000	usd
CY2023Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	184300000	usd
CY2022Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	153400000	usd
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	32900000	usd
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	35700000	usd
CY2023Q4	nix	Totalleasedassets Totalleasedassets	217200000	usd
CY2022Q4	nix	Totalleasedassets Totalleasedassets	189100000	usd
CY2023Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	23800000	usd
CY2022Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	30000000.0	usd
CY2023Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	8300000	usd
CY2022Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	4800000	usd
CY2023Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	181600000	usd
CY2022Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	144700000	usd
CY2023Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	25800000	usd
CY2022Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	31900000	usd
CY2023Q4	nix	Total Lease Liability TotalLeaseLiability	239500000	usd
CY2022Q4	nix	Total Lease Liability TotalLeaseLiability	211400000	usd
CY2023	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	9300000	usd
CY2022	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	8600000	usd
CY2023	us-gaap	Operating Lease Payments OperatingLeasePayments	11100000	usd
CY2022	us-gaap	Operating Lease Payments OperatingLeasePayments	10300000	usd
CY2023	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	33100000	usd
CY2022	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	30300000	usd
CY2023	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	64500000	usd
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	19300000	usd
CY2023	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	5600000	usd
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	8800000	usd
CY2023Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P16Y4M24D
CY2022Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P9Y10M24D
CY2023Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y8M12D
CY2022Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P7Y8M12D
CY2023Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.055	rate
CY2022Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.051	rate
CY2023Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.043	rate
CY2022Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.040	rate
CY2023Q4	nix	Total Future Minimum Lease Payments Due Next Twelve Months TotalFutureMinimumLeasePaymentsDueNextTwelveMonths	44400000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	34800000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	9600000	usd
CY2023Q4	nix	Total Future Minimum Lease Payments Duein Two Years TotalFutureMinimumLeasePaymentsDueinTwoYears	36600000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	30700000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	5900000	usd
CY2023Q4	nix	Total Future Minimum Lease Payments Duein Three Years TotalFutureMinimumLeasePaymentsDueinThreeYears	31100000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	25700000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	5400000	usd
CY2023Q4	nix	Total Future Minimum Lease Payments Duein Four Years TotalFutureMinimumLeasePaymentsDueinFourYears	25200000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	20600000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	4600000	usd
CY2023Q4	nix	Total Future Minimum Lease Payments Duein Five Years TotalFutureMinimumLeasePaymentsDueinFiveYears	22500000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	19300000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	3200000	usd
CY2023Q4	nix	Total Future Minimum Lease Payments Due Thereafter TotalFutureMinimumLeasePaymentsDueThereafter	201700000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	190700000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	11000000.0	usd
CY2023Q4	nix	Total Future Minimum Lease Payments Due TotalFutureMinimumLeasePaymentsDue	361500000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	321800000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	39700000	usd
CY2023Q4	nix	Undiscounted Excess Amount UndiscountedExcessAmount	122000000.0	usd
CY2023Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	116400000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	5600000	usd
CY2023Q4	nix	Total Lease Liability TotalLeaseLiability	239500000	usd
CY2023Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	205400000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	34100000	usd
CY2023Q4	nix	Shortterm Lease Liability ShorttermLeaseLiability	32100000	usd
CY2023Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	23800000	usd
CY2023Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	8300000	usd
CY2023Q4	nix	Longterm Lease Liability LongtermLeaseLiability	207400000	usd
CY2023Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	181600000	usd
CY2023Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	25800000	usd
CY2023Q4	nix	Total Lease Liability TotalLeaseLiability	239500000	usd
CY2023Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	205400000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	34100000	usd
CY2023Q4	nix	Longterm Debt Future Minimum Payments Due LongtermDebtFutureMinimumPaymentsDue	10955000000	usd
CY2023Q4	nix	Longterm Debt Future Minimum Payments Due Next Twelve Months LongtermDebtFutureMinimumPaymentsDueNextTwelveMonths	0	usd
CY2023Q4	nix	Longterm Debt Future Minimum Payments Duein Two Years LongtermDebtFutureMinimumPaymentsDueinTwoYears	1260000000	usd
CY2023Q4	nix	Longterm Debt Future Minimum Payments Duein Three Years LongtermDebtFutureMinimumPaymentsDueinThreeYears	0	usd
CY2023Q4	nix	Longterm Debt Future Minimum Payments Duein Four Years LongtermDebtFutureMinimumPaymentsDueinFourYears	1090000000	usd
CY2023Q4	nix	Longterm Debt Future Minimum Payments Duein Five Years LongtermDebtFutureMinimumPaymentsDueinFiveYears	1055000000	usd
CY2023Q4	nix	Longterm Debt Future Minimum Payments Due Thereafter LongtermDebtFutureMinimumPaymentsDueThereafter	7550000000	usd
CY2023Q4	nix	Interest Paymentson Longterm Debt Future Minimum Payments Due InterestPaymentsonLongtermDebtFutureMinimumPaymentsDue	6017800000	usd
CY2023Q4	nix	Interest Paymentson Longterm Debt Future Minimum Payments Due Next Twelve Months InterestPaymentsonLongtermDebtFutureMinimumPaymentsDueNextTwelveMonths	431100000	usd
CY2023Q4	nix	Interest Paymentson Longterm Debt Future Minimum Payments Duein Two Years InterestPaymentsonLongtermDebtFutureMinimumPaymentsDueinTwoYears	431100000	usd
CY2023Q4	nix	Interest Paymentson Longterm Debt Future Minimum Payments Duein Three Years InterestPaymentsonLongtermDebtFutureMinimumPaymentsDueinThreeYears	418500000	usd
CY2023Q4	nix	Interest Paymentson Longterm Debt Future Minimum Payments Duein Four Years InterestPaymentsonLongtermDebtFutureMinimumPaymentsDueinFourYears	399100000	usd
CY2023Q4	nix	Interest Paymentson Longterm Debt Future Minimum Payments Duein Five Years InterestPaymentsonLongtermDebtFutureMinimumPaymentsDueinFiveYears	349000000.0	usd
CY2023Q4	nix	Interest Paymentson Longterm Debt Future Minimum Payments Due Thereafter InterestPaymentsonLongtermDebtFutureMinimumPaymentsDueThereafter	3989000000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	321800000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	34800000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	30700000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	25700000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	20600000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	19300000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	190700000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	39700000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	9600000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	5900000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	5400000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	4600000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	3200000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	11000000.0	usd
CY2023Q4	nix	Energy Commodity Contracts Future Minimum Payments Due EnergyCommodityContractsFutureMinimumPaymentsDue	153900000	usd
CY2023Q4	nix	Energy Commodity Contracts Future Minimum Payments Due Next Twelve Months EnergyCommodityContractsFutureMinimumPaymentsDueNextTwelveMonths	114700000	usd
CY2023Q4	nix	Energy Commodity Contracts Future Minimum Payments Duein Two Years EnergyCommodityContractsFutureMinimumPaymentsDueinTwoYears	39200000	usd
CY2023Q4	nix	Energy Commodity Contracts Future Minimum Payments Duein Three Years EnergyCommodityContractsFutureMinimumPaymentsDueinThreeYears	0	usd
CY2023Q4	nix	Energy Commodity Contracts Future Minimum Payments Duein Four Years EnergyCommodityContractsFutureMinimumPaymentsDueinFourYears	0	usd
CY2023Q4	nix	Energy Commodity Contracts Future Minimum Payments Duein Five Years EnergyCommodityContractsFutureMinimumPaymentsDueinFiveYears	0	usd
CY2023Q4	nix	Energy Commodity Contracts Future Minimum Payments Due Thereafter EnergyCommodityContractsFutureMinimumPaymentsDueThereafter	0	usd
CY2023Q4	nix	Service Obligations Pipeline Service Obligations Future Minimum Payments Due ServiceObligationsPipelineServiceObligationsFutureMinimumPaymentsDue	2196600000	usd
CY2023Q4	nix	Service Obligations Pipeline Service Obligations Future Minimum Payments Due Next Twelve Months ServiceObligationsPipelineServiceObligationsFutureMinimumPaymentsDueNextTwelveMonths	652000000.0	usd
CY2023Q4	nix	Service Obligations Pipeline Service Obligations Future Minimum Payments Duein Two Years ServiceObligationsPipelineServiceObligationsFutureMinimumPaymentsDueinTwoYears	485700000	usd
CY2023Q4	nix	Service Obligations Pipeline Service Obligations Future Minimum Payments Duein Three Years ServiceObligationsPipelineServiceObligationsFutureMinimumPaymentsDueinThreeYears	406300000	usd
CY2023Q4	nix	Service Obligations Pipeline Service Obligations Future Minimum Payments Duein Four Years ServiceObligationsPipelineServiceObligationsFutureMinimumPaymentsDueinFourYears	388700000	usd
CY2023Q4	nix	Service Obligations Pipeline Service Obligations Future Minimum Payments Duein Five Years ServiceObligationsPipelineServiceObligationsFutureMinimumPaymentsDueinFiveYears	162300000	usd
CY2023Q4	nix	Service Obligations Pipeline Service Obligations Future Minimum Payments Due Thereafter ServiceObligationsPipelineServiceObligationsFutureMinimumPaymentsDueThereafter	101600000	usd
CY2023Q4	nix	Service Obligations It Service Obligations Future Minimum Payments Due ServiceObligationsITServiceObligationsFutureMinimumPaymentsDue	161800000	usd
CY2023Q4	nix	Service Obligations It Service Obligations Future Minimum Payments Due Next Twelve Months ServiceObligationsITServiceObligationsFutureMinimumPaymentsDueNextTwelveMonths	83600000	usd
CY2023Q4	nix	Service Obligations It Service Obligations Future Minimum Payments Duein Two Years ServiceObligationsITServiceObligationsFutureMinimumPaymentsDueinTwoYears	57200000	usd
CY2023Q4	nix	Service Obligations It Service Obligations Future Minimum Payments Duein Three Years ServiceObligationsITServiceObligationsFutureMinimumPaymentsDueinThreeYears	16700000	usd
CY2023Q4	nix	Service Obligations It Service Obligations Future Minimum Payments Duein Four Years ServiceObligationsITServiceObligationsFutureMinimumPaymentsDueinFourYears	4300000	usd
CY2023Q4	nix	Service Obligations It Service Obligations Future Minimum Payments Duein Five Years ServiceObligationsITServiceObligationsFutureMinimumPaymentsDueinFiveYears	0	usd
CY2023Q4	nix	Service Obligations It Service Obligations Future Minimum Payments Due Thereafter ServiceObligationsITServiceObligationsFutureMinimumPaymentsDueThereafter	0	usd
CY2023Q4	nix	Other Liabilities Future Minimum Payments Due OtherLiabilitiesFutureMinimumPaymentsDue	98300000	usd
CY2023Q4	nix	Other Liabilities Future Minimum Payments Due Next Twelve Months OtherLiabilitiesFutureMinimumPaymentsDueNextTwelveMonths	62800000	usd
CY2023Q4	nix	Other Liabilities Future Minimum Payments Duein Two Years OtherLiabilitiesFutureMinimumPaymentsDueinTwoYears	5800000	usd
CY2023Q4	nix	Other Liabilities Future Minimum Payments Duein Three Years OtherLiabilitiesFutureMinimumPaymentsDueinThreeYears	5200000	usd
CY2023Q4	nix	Other Liabilities Future Minimum Payments Duein Four Years OtherLiabilitiesFutureMinimumPaymentsDueinFourYears	5200000	usd
CY2023Q4	nix	Other Liabilities Future Minimum Payments Duein Five Years OtherLiabilitiesFutureMinimumPaymentsDueinFiveYears	5200000	usd
CY2023Q4	nix	Other Liabilities Future Minimum Payments Due Thereafter OtherLiabilitiesFutureMinimumPaymentsDueThereafter	14100000	usd
CY2023Q4	nix	Total Future Contractual Obligations Due TotalFutureContractualObligationsDue	19944900000	usd
CY2023Q4	nix	Total Future Contractual Obligations Due Next Twelve Months TotalFutureContractualObligationsDueNextTwelveMonths	1388600000	usd
CY2023Q4	nix	Total Future Contractual Obligations Duein Two Years TotalFutureContractualObligationsDueinTwoYears	2315600000	usd
CY2023Q4	nix	Total Future Contractual Obligations Duein Three Years TotalFutureContractualObligationsDueinThreeYears	877800000	usd
CY2023Q4	nix	Total Future Contractual Obligations Duein Four Years TotalFutureContractualObligationsDueinFourYears	1912500000	usd
CY2023Q4	nix	Total Future Contractual Obligations Duein Five Years TotalFutureContractualObligationsDueinFiveYears	1594000000	usd
CY2023Q4	nix	Total Future Contractual Obligations Due Thereafter TotalFutureContractualObligationsDueThereafter	11856400000	usd
CY2023Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	-81100000	usd
CY2023Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	116400000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	5600000	usd
CY2023Q4	nix	Wind Power Purchase Agreement Capacity WindPowerPurchaseAgreementCapacity	700	mw
CY2023Q4	nix	Major Rail Operators MajorRailOperators	3
CY2023Q4	us-gaap	Guarantee Obligations Current Carrying Value GuaranteeObligationsCurrentCarryingValue	646100000	usd
CY2022Q4	us-gaap	Guarantee Obligations Current Carrying Value GuaranteeObligationsCurrentCarryingValue	841600000	usd
CY2023Q4	us-gaap	Accrual For Environmental Loss Contingencies Gross AccrualForEnvironmentalLossContingenciesGross	80000000	usd
CY2022Q4	us-gaap	Accrual For Environmental Loss Contingencies Gross AccrualForEnvironmentalLossContingenciesGross	86500000	usd
CY2023Q4	us-gaap	Other Commitment OtherCommitment	250000000	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
CY2022	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	87100000	usd
CY2022	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	2600000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	89700000	usd
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-37100000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	1200000	usd
CY2023	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	2300000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	3500000	usd
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-33600000	usd
CY2023	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2
CY2023	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	5505400000	usd
CY2022	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	5850600000	usd
CY2021	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	4899600000	usd
CY2023	us-gaap	Operating Income Loss OperatingIncomeLoss	1295500000	usd
CY2022	us-gaap	Operating Income Loss OperatingIncomeLoss	1265800000	usd
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	1006900000	usd
CY2023	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	908200000	usd
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	820800000	usd
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	748400000	usd
CY2023Q4	us-gaap	Assets Assets	31077200000	usd
CY2022Q4	us-gaap	Assets Assets	26736600000	usd
CY2021Q4	us-gaap	Assets Assets	24156900000	usd
CY2023	nix	Payments To Acquire Property Plant And Equipment Including Captial Expenditures From Current Liabilities And Equity Method Investments PaymentsToAcquirePropertyPlantAndEquipmentIncludingCaptialExpendituresFromCurrentLiabilitiesAndEquityMethodInvestments	2690700000	usd
CY2022	nix	Payments To Acquire Property Plant And Equipment Including Captial Expenditures From Current Liabilities And Equity Method Investments PaymentsToAcquirePropertyPlantAndEquipmentIncludingCaptialExpendituresFromCurrentLiabilitiesAndEquityMethodInvestments	2298000000	usd
CY2021	nix	Payments To Acquire Property Plant And Equipment Including Captial Expenditures From Current Liabilities And Equity Method Investments PaymentsToAcquirePropertyPlantAndEquipmentIncludingCaptialExpendituresFromCurrentLiabilitiesAndEquityMethodInvestments	1940400000	usd
CY2023	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	9000000.0	usd
CY2022	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	4300000	usd
CY2021	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	4000000.0	usd
CY2023	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	25200000	usd
CY2022	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	15100000	usd
CY2021	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	13100000	usd
CY2023	nix	Charitable Contributions CharitableContributions	1800000	usd
CY2022	nix	Charitable Contributions CharitableContributions	4400000	usd
CY2021	nix	Charitable Contributions CharitableContributions	11500000	usd
CY2023	nix	Pensionand Other Postretirement Non Service Cost PensionandOtherPostretirementNonServiceCost	-24000000.0	usd
CY2022	nix	Pensionand Other Postretirement Non Service Cost PensionandOtherPostretirementNonServiceCost	27600000	usd
CY2021	nix	Pensionand Other Postretirement Non Service Cost PensionandOtherPostretirementNonServiceCost	35500000	usd
CY2023	us-gaap	Provision For Other Losses ProvisionForOtherLosses	-400000	usd
CY2023	us-gaap	Provision For Other Losses ProvisionForOtherLosses	-400000	usd
CY2022	nix	Miscellaneous Non Operating Income Expense MiscellaneousNonOperatingIncomeExpense	-400000	usd
CY2021	nix	Miscellaneous Non Operating Income Expense MiscellaneousNonOperatingIncomeExpense	-300000	usd
CY2023	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	8000000.0	usd
CY2022	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	52200000	usd
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	40800000	usd
CY2023	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	404100000	usd
CY2022	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	344500000	usd
CY2021	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	336400000	usd
CY2023	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	108900000	usd
CY2022	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	22700000	usd
CY2021	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	600000	usd
CY2023	nix	Discount On Prepayment Transaction DiscountOnPrepaymentTransaction	13500000	usd
CY2022	nix	Discount On Prepayment Transaction DiscountOnPrepaymentTransaction	11700000	usd
CY2021	nix	Discount On Prepayment Transaction DiscountOnPrepaymentTransaction	11000000.0	usd
CY2023	nix	Securitization Transaction Fees SecuritizationTransactionFees	2700000	usd
CY2022	nix	Securitization Transaction Fees SecuritizationTransactionFees	2500000	usd
CY2021	nix	Securitization Transaction Fees SecuritizationTransactionFees	1400000	usd
CY2023	nix	Allowance For Borrowed Funds Used And Interest Capitalized During Construction AllowanceForBorrowedFundsUsedAndInterestCapitalizedDuringConstruction	25300000	usd
CY2022	nix	Allowance For Borrowed Funds Used And Interest Capitalized During Construction AllowanceForBorrowedFundsUsedAndInterestCapitalizedDuringConstruction	6700000	usd
CY2021	nix	Allowance For Borrowed Funds Used And Interest Capitalized During Construction AllowanceForBorrowedFundsUsedAndInterestCapitalizedDuringConstruction	4600000	usd
CY2023	nix	Debtbasedpostinservicecarryingcharges Debtbasedpostinservicecarryingcharges	30700000	usd
CY2022	nix	Debtbasedpostinservicecarryingcharges Debtbasedpostinservicecarryingcharges	21100000	usd
CY2021	nix	Debtbasedpostinservicecarryingcharges Debtbasedpostinservicecarryingcharges	14700000	usd
CY2023	us-gaap	Interest Expense Other InterestExpenseOther	16400000	usd
CY2022	us-gaap	Interest Expense Other InterestExpenseOther	8000000.0	usd
CY2021	us-gaap	Interest Expense Other InterestExpenseOther	11000000.0	usd
CY2023	us-gaap	Interest Expense InterestExpense	489600000	usd
CY2022	us-gaap	Interest Expense InterestExpense	361600000	usd
CY2021	us-gaap	Interest Expense InterestExpense	341100000	usd
CY2023	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	315000000.0	usd
CY2022	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	275100000	usd
CY2021	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	245700000	usd
CY2023	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	64500000	usd
CY2022	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	19300000	usd
CY2021	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	22400000	usd
CY2023	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	5600000	usd
CY2022	nix	Noncashor Part Noncash Acquisition Fixed Assets Acquired Operating Lease NoncashorPartNoncashAcquisitionFixedAssetsAcquiredOperatingLease	8800000	usd
CY2021	nix	Noncashor Part Noncash Acquisition Fixed Assets Acquired Operating Lease NoncashorPartNoncashAcquisitionFixedAssetsAcquiredOperatingLease	6000000.0	usd
CY2023	nix	Reclassificationof Other Propertyto Regulatory Assets ReclassificationofOtherPropertytoRegulatoryAssets	0	usd
CY2022	nix	Reclassificationof Other Propertyto Regulatory Assets ReclassificationofOtherPropertytoRegulatoryAssets	0	usd
CY2021	nix	Reclassificationof Other Propertyto Regulatory Assets ReclassificationofOtherPropertytoRegulatoryAssets	607600000	usd
CY2023	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	61100000	usd
CY2022	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	6300000	usd
CY2021	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	12000000.0	usd
CY2023Q4	nix	Obligation To The Developer ObligationToTheDeveloper	0	usd
CY2022Q4	nix	Obligation To The Developer ObligationToTheDeveloper	0	usd
CY2021Q4	nix	Obligation To The Developer ObligationToTheDeveloper	277500000	usd
CY2023Q4	nix	Purchase Contract Liability PurchaseContractLiability	0	usd
CY2022Q4	nix	Purchase Contract Liability PurchaseContractLiability	65000000.0	usd
CY2021Q4	nix	Purchase Contract Liability PurchaseContractLiability	129400000	usd
CY2023	us-gaap	Interest Paid Net InterestPaidNet	433900000	usd
CY2022	us-gaap	Interest Paid Net InterestPaidNet	343800000	usd
CY2021	us-gaap	Interest Paid Net InterestPaidNet	322400000	usd
CY2023	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	8600000	usd
CY2022	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	8500000	usd
CY2021	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	9400000	usd
CY2023	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	9400000	usd
CY2022	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	7200000	usd
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	5400000	usd
CY2023	dei	Auditor Firm AuditorFirmId	34

Files In Submission

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$NI
NISOURCE INC. Stock $ni

2024 Q1 Form 10-K Financial Statement

#000111171124000011 Filed on February 21, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NI NISOURCE INC. Stock $ni

2024 Q1 Form 10-K Financial Statement

#000111171124000011 Filed on February 21, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NI
NISOURCE INC. Stock $ni