$LNT
ALLIANT ENERGY CORP Stock $lnt

$lnt Overview Financials Valuation SEC Filings Company Website

2018 Form 10-K Financial Statement

#000035254119000013 Filed on February 22, 2019

Income Statement

Concept	2018	2017 Q4	2017 Q3
Revenue	$3.534B	$856.1M	$906.9M
YoY Change	4.49%	7.42%	-1.91%
Cost Of Revenue	$496.0M	$75.90M	$15.00M
YoY Change	3.14%	22.42%	20.0%
Gross Profit	$3.038B	$780.2M	$891.9M
YoY Change	4.71%	6.15%	-2.21%
Gross Profit Margin	85.96%	91.13%	98.35%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$507.0M	$119.1M	$120.7M
YoY Change	9.79%	15.74%	15.95%
% of Gross Profit	16.69%	15.27%	13.53%
Operating Expenses	$2.608B	$646.2M	$655.6M
YoY Change	4.33%	4.56%	-1.13%
Operating Profit	$694.0M	$134.0M	$236.3M
YoY Change	3.4%	34.13%	45.33%
Interest Expense	$247.0M	-$31.70M	$53.90M
YoY Change	14.56%	41.52%	10.45%
% of Operating Profit	35.59%	-23.66%	22.81%
Other Income/Expense, Net	-$124.0M	-$4.200M	-$38.80M
YoY Change	-10.4%	-75.15%	63.71%
Pretax Income	$570.0M	$98.10M	$197.5M
YoY Change	6.98%	26.25%	42.19%
Income Tax	$48.00M	$19.90M	$26.10M
% Of Pretax Income	8.42%	20.29%	13.22%
Net Earnings	$522.0M	$96.30M	$171.4M
YoY Change	11.66%	47.7%	30.84%
Net Earnings / Revenue	14.77%	11.25%	18.9%
Basic Earnings Per Share	$2.19
Diluted Earnings Per Share	$2.19	$0.41	$0.73
COMMON SHARES
Basic Shares Outstanding	233.6M shares		231.2M shares
Diluted Shares Outstanding	233.6M shares

Balance Sheet

Concept	2018	2017 Q4	2017 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$21.00M	$28.00M	$9.000M
YoY Change	-25.0%	250.0%	-89.41%
Cash & Equivalents	$21.00M	$27.90M	$9.200M
Short-Term Investments
Other Short-Term Assets	$276.0M	$46.40M	$101.4M
YoY Change	7.39%	-51.41%	2.53%
Inventory	$212.0M	$222.0M	$221.0M
Prepaid Expenses
Receivables	$81.00M	$482.8M	$336.1M
Other Receivables	$195.0M	$0.00	$0.00
Total Short-Term Assets	$785.0M	$905.1M	$751.5M
YoY Change	-13.26%	3.19%	-21.56%
LONG-TERM ASSETS
Property, Plant & Equipment	$12.46B	$11.23B	$10.93B
YoY Change	10.93%	9.29%	10.19%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$431.0M	$381.4M	$459.0M
YoY Change	8.84%	16.99%	39.09%
Other Assets	$1.747B	$69.70M	$21.40M
YoY Change	5.75%	208.41%	127.66%
Total Long-Term Assets	$14.64B	$1.652B	$1.974B
YoY Change	10.22%	-12.12%	8.38%
TOTAL ASSETS
Total Short-Term Assets	$785.0M	$905.1M	$751.5M
Total Long-Term Assets	$14.64B	$1.652B	$1.974B
Total Assets	$15.43B	$14.19B	$14.11B
YoY Change	8.73%	6.09%	8.33%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$543.0M	$477.3M	$478.1M
YoY Change	13.84%	7.19%	30.95%
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$441.0M	$415.0M	$485.0M
YoY Change	6.27%	70.08%	103.78%
Long-Term Debt Due	$257.0M	$855.7M	$105.2M
YoY Change	-69.98%	18502.17%	-66.5%
Total Short-Term Liabilities	$1.644B	$2.149B	$1.470B
YoY Change	-23.5%	84.94%	7.33%
LONG-TERM LIABILITIES
Long-Term Debt	$5.246B	$4.011B	$4.255B
YoY Change	30.79%	-7.07%	11.48%
Other Long-Term Liabilities	$2.147B	$306.4M	$296.1M
YoY Change	-0.97%	9.7%	-1.37%
Total Long-Term Liabilities	$7.393B	$4.317B	$4.551B
YoY Change	19.65%	-6.05%	10.54%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.644B	$2.149B	$1.470B
Total Long-Term Liabilities	$7.393B	$4.317B	$4.551B
Total Liabilities	$10.64B	$6.466B	$6.021B
YoY Change	8.5%	12.32%	9.74%
SHAREHOLDERS EQUITY
Retained Earnings		$2.346B	$2.325B
YoY Change		7.76%	6.59%
Common Stock		$1.848B	$1.841B
YoY Change		8.99%	9.01%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$4.786B	$4.182B	$4.154B
YoY Change
Total Liabilities & Shareholders Equity	$15.43B	$14.19B	$14.11B
YoY Change	8.73%	6.09%	8.33%

Cashflow Statement

Concept	2018	2017 Q4	2017 Q3
OPERATING ACTIVITIES
Net Income	$522.0M	$96.30M	$171.4M
YoY Change	11.66%	47.7%	30.84%
Depreciation, Depletion And Amortization	$507.0M	$119.1M	$120.7M
YoY Change	9.79%	15.74%	15.95%
Cash From Operating Activities	$528.0M	$532.1M	$323.8M
YoY Change	1.23%	-303.71%	124.86%
INVESTING ACTIVITIES
Capital Expenditures	$1.634B	-$389.3M	-$326.9M
YoY Change	11.39%	0.44%	29.41%
Acquisitions
YoY Change
Other Investing Activities	$38.00M	-$467.9M	-$60.30M
YoY Change	34.28%	-206.53%	227.72%
Cash From Investing Activities	-$1.067B	-$857.2M	-$387.2M
YoY Change	3.25%	-1761.24%	42.88%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$197.0M
YoY Change	31.68%
Debt Paid & Issued, Net	$856.0M
YoY Change	18508.7%
Cash From Financing Activities	$531.0M	342.7M	66.40M
YoY Change	-0.3%	158.45%	-67.64%
NET CHANGE
Cash From Operating Activities	$528.0M	532.1M	323.8M
Cash From Investing Activities	-$1.067B	-857.2M	-387.2M
Cash From Financing Activities	$531.0M	342.7M	66.40M
Net Change In Cash	-$8.000M	17.60M	3.000M
YoY Change	-138.46%	-122.86%	-96.16%
FREE CASH FLOW
Cash From Operating Activities	$528.0M	$532.1M	$323.8M
Capital Expenditures	$1.634B	-$389.3M	-$326.9M
Free Cash Flow	-$1.106B	$921.4M	$650.7M
YoY Change	17.0%	628.96%	64.07%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2018	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2018	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2018	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2018
CY2018	dei	Document Period End Date DocumentPeriodEndDate	2018-12-31
CY2018	dei	Document Type DocumentType	10-K
CY2018	dei	Entity Central Index Key EntityCentralIndexKey	0000352541
CY2019Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	236074475	shares
CY2018	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2018	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2018Q2	dei	Entity Public Float EntityPublicFloat	9900000000	USD
CY2018	dei	Entity Registrant Name EntityRegistrantName	ALLIANT ENERGY CORP
CY2018	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2018	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
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CY2018Q4	lnt	Accumulated Depreciation On Property Plant And Equipment Non Regulated Business Line1 AccumulatedDepreciationOnPropertyPlantAndEquipmentNonRegulatedBusinessLine1	54500000	USD
CY2017Q4	lnt	Accumulated Depreciation On Property Plant And Equipment Non Regulated Business Line2 AccumulatedDepreciationOnPropertyPlantAndEquipmentNonRegulatedBusinessLine2	285600000	USD
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CY2018	lnt	Adjustment Depreciation And Amortization Including Discontinued Operations AdjustmentDepreciationAndAmortizationIncludingDiscontinuedOperations	506900000	USD
CY2018	lnt	Adjustment To Net Periodic Benefit Costs Percentage AdjustmentToNetPeriodicBenefitCostsPercentage	0.40
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CY2018	lnt	Carrying Value Of Deferred Compensation CarryingValueOfDeferredCompensation	9800000	USD
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CY2017Q4	lnt	Common Stock Percentage In Assets Held Saving Plans CommonStockPercentageInAssetsHeldSavingPlans	0.115
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CY2018	lnt	Fair Market Value Of Deferred Compensation FairMarketValueOfDeferredCompensation	16200000	USD
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CY2018Q4	lnt	Hybrid Securities Maximum Limit HybridSecuritiesMaximumLimit	0.15
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CY2018	lnt	Minimum Remaining Estimated Cost Incurred For Investigation Remediation And Monitoring MinimumRemainingEstimatedCostIncurredForInvestigationRemediationAndMonitoring	11000000	USD
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CY2018	lnt	Statute Of Limitations Expiration Period From Extended Due Date Of Federal Tax Return StatuteOfLimitationsExpirationPeriodFromExtendedDueDateOfFederalTaxReturn	P3Y
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CY2018	lnt	Statuteof Limitations Expiration Periodfrom Extended Due Dateof Wisconsin Tax Return StatuteofLimitationsExpirationPeriodfromExtendedDueDateofWisconsinTaxReturn	P4Y
CY2017	lnt	Tax Cuts And Jobs Act Of2017 Change In Income Tax Expense Benefit TaxCutsAndJobsActOf2017ChangeInIncomeTaxExpenseBenefit	-18100000	USD
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CY2018Q4	us-gaap	Common Stock Value CommonStockValue	2400000	USD
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CY2017	us-gaap	Consideration Received For Beneficial Interest Obtained For Transferring Financial Asset ConsiderationReceivedForBeneficialInterestObtainedForTransferringFinancialAsset	222100000	USD
CY2018	us-gaap	Consideration Received For Beneficial Interest Obtained For Transferring Financial Asset ConsiderationReceivedForBeneficialInterestObtainedForTransferringFinancialAsset	119400000	USD
CY2016	us-gaap	Cost Of Transmission CostOfTransmission	527900000	USD
CY2017	us-gaap	Cost Of Transmission CostOfTransmission	480900000	USD
CY2018	us-gaap	Cost Of Transmission CostOfTransmission	495700000	USD
CY2016	us-gaap	Costs And Expenses CostsAndExpenses	2765900000	USD
CY2017	us-gaap	Costs And Expenses CostsAndExpenses	2711000000	USD
CY2018	us-gaap	Costs And Expenses CostsAndExpenses	2840100000	USD
CY2017Q4	us-gaap	Costs In Excess Of Billings On Uncompleted Contracts Or Programs Expected To Be Collected Within One Year CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear	85100000	USD
CY2018Q4	us-gaap	Costs In Excess Of Billings On Uncompleted Contracts Or Programs Expected To Be Collected Within One Year CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear	74200000	USD
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	1800000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-41000000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-1000000	USD
CY2016	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	17200000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	8500000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-5100000	USD
CY2017Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	4902500000	USD
CY2018Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	5546700000	USD
CY2017Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	10800000	USD
CY2018Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	11800000	USD
CY2017Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	3646000000	USD
CY2018Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	3749900000	USD
CY2016	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	112800000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	159500000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	67900000	USD
CY2017Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	25400000	USD
CY2018Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	32100000	USD
CY2016	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	84600000	USD
CY2017	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	139600000	USD
CY2018	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	67000000	USD
CY2018	us-gaap	Deferred Revenue Refund Payments1 DeferredRevenueRefundPayments1	66000000	USD
CY2016	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	4900000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	12300000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	29800000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	545600000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	564500000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	536600000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	555300000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	174400000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	158600000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	41300000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	47000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	69200000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	59800000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	260700000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	299100000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	9000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	9200000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1478400000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1603100000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	1478400000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	1603100000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	75900000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	80500000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1852700000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1975500000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	466000000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	91000000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	94800000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	93800000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	92500000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	104200000	USD
CY2016	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	23600000	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	24800000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	25100000	USD
CY2016	us-gaap	Depreciation And Amortization DepreciationAndAmortization	411600000	USD
CY2017	us-gaap	Depreciation And Amortization DepreciationAndAmortization	461800000	USD
CY2018	us-gaap	Depreciation And Amortization DepreciationAndAmortization	506900000	USD
CY2016	us-gaap	Dividends Common Stock DividendsCommonStock	266500000	USD
CY2017	us-gaap	Dividends Common Stock DividendsCommonStock	288300000	USD
CY2018	us-gaap	Dividends Common Stock DividendsCommonStock	312200000	USD
CY2016	us-gaap	Dividends Preferred Stock DividendsPreferredStock	10200000	USD
CY2017	us-gaap	Dividends Preferred Stock DividendsPreferredStock	10200000	USD
CY2018	us-gaap	Dividends Preferred Stock DividendsPreferredStock	10200000	USD
CY2016	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	1.64
CY2017	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	1.99
CY2018	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	2.19
CY2017Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.44
CY2017Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.41
CY2018Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	644000000	USD
CY2016	us-gaap	Equity Method Investment Summarized Financial Information Gross Profit Loss EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss	331000000	USD
CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.73
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.41
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.52
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.43
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.87
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.36
CY2016	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.134
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.125
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.084
CY2016	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0.072
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0.061
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0.052
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.005
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.009
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.012
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0.000
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0.034
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0.010
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Prior Year Income Taxes EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes	0.008
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Prior Year Income Taxes EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes	0.015
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Prior Year Income Taxes EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes	0.023
CY2016	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.054
CY2017	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.055
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.070
CY2016	us-gaap	Electric Production Expense ElectricProductionExpense	854000000	USD
CY2017	us-gaap	Electric Production Expense ElectricProductionExpense	818100000	USD
CY2018	us-gaap	Electric Production Expense ElectricProductionExpense	855000000	USD
CY2018Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	4900000	USD
CY2016	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	7400000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	6200000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4900000	USD
CY2017Q4	us-gaap	Energy Related Inventory Gas Stored Underground EnergyRelatedInventoryGasStoredUnderground	44500000	USD
CY2018Q4	us-gaap	Energy Related Inventory Gas Stored Underground EnergyRelatedInventoryGasStoredUnderground	49000000	USD
CY2017Q4	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	72300000	USD
CY2018Q4	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	61400000	USD
CY2016	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	28300000	USD
CY2017	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	38100000	USD
CY2018	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	43900000	USD
CY2017Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Assets EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	104000000	USD
CY2018Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Assets EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	144000000	USD
CY2017Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	770000000	USD
CY2017	us-gaap	Equity Method Investment Summarized Financial Information Gross Profit Loss EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss	374000000	USD
CY2018	us-gaap	Equity Method Investment Summarized Financial Information Gross Profit Loss EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss	325000000	USD
CY2017Q4	us-gaap	Equity Method Investment Summarized Financial Information Minority Interest EquityMethodInvestmentSummarizedFinancialInformationMinorityInterest	255000000	USD
CY2018Q4	us-gaap	Equity Method Investment Summarized Financial Information Minority Interest EquityMethodInvestmentSummarizedFinancialInformationMinorityInterest	223000000	USD
CY2016	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	232000000	USD
CY2017	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	267000000	USD
CY2018	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	217000000	USD
CY2017Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Assets EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets	5041000000	USD
CY2018Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Assets EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets	5498000000	USD
CY2017Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Liabilities EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities	2038000000	USD
CY2018Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Liabilities EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities	2315000000	USD
CY2016	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	658000000	USD
CY2017	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	741000000	USD
CY2018	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	724000000	USD
CY2016Q4	us-gaap	Equity Method Investments EquityMethodInvestments	326000000	USD
CY2017Q4	us-gaap	Equity Method Investments EquityMethodInvestments	381400000	USD
CY2018Q4	us-gaap	Equity Method Investments EquityMethodInvestments	421300000	USD
CY2016	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	86400000	USD
CY2017	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	0	USD
CY2018	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	0	USD
CY2016	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	373800000	USD
CY2017Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	99000000	USD
CY2017Q2	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	94300000	USD
CY2017Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	168800000	USD
CY2017Q4	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	93800000	USD
CY2017	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	455900000	USD
CY2018Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	120900000	USD
CY2018Q2	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	100400000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	205500000	USD
CY2018Q4	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	85300000	USD
CY2018	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	512100000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	443400000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	532800000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	570000000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	384000000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	466100000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	522300000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Per Basic And Diluted Share IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	1.65
CY2017	us-gaap	Income Loss From Continuing Operations Per Basic And Diluted Share IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	1.99
CY2018	us-gaap	Income Loss From Continuing Operations Per Basic And Diluted Share IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	2.19
CY2017Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.43
CY2017Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.41
CY2017Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.73
CY2017Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.41
CY2018Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.52
CY2018Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.43
CY2018Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.87
CY2018Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.36
CY2016	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-2300000	USD
CY2017	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	1400000	USD
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	0	USD
CY2016	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-2300000	USD
CY2017Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	1400000	USD
CY2017Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
CY2017Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
CY2017Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
CY2017	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	1400000	USD
CY2018Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
CY2018Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
CY2018Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
CY2018Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
CY2016	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic And Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	-0.01
CY2017	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic And Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	0.00
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic And Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	0.00
CY2017Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.01
CY2017Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2017Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2017Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2018Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2018Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2018Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2018Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2016	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	39600000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	44800000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	54600000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	59400000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	66700000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	47700000	USD
CY2016	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	9800000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	11300000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	5000000	USD
CY2016	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	572200000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	441200000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	475400000	USD
CY2016	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	42300000	USD
CY2017	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	33600000	USD
CY2018	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	51400000	USD
CY2016	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-102400000	USD
CY2017	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-81700000	USD
CY2018	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-55900000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-22500000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-38700000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	90400000	USD
CY2016	us-gaap	Increase Decrease In Other Regulatory Assets IncreaseDecreaseInOtherRegulatoryAssets	3600000	USD
CY2017	us-gaap	Increase Decrease In Other Regulatory Assets IncreaseDecreaseInOtherRegulatoryAssets	130800000	USD
CY2018	us-gaap	Increase Decrease In Other Regulatory Assets IncreaseDecreaseInOtherRegulatoryAssets	16200000	USD
CY2016	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	-63000000	USD
CY2017	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	-83800000	USD
CY2018	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	1300000	USD
CY2016	us-gaap	Interest Expense InterestExpense	196200000	USD
CY2017	us-gaap	Interest Expense InterestExpense	215600000	USD
CY2018	us-gaap	Interest Expense InterestExpense	247000000	USD
CY2016	us-gaap	Interest Paid Net InterestPaidNet	192400000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	212600000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	247500000	USD
CY2017Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	105600000	USD
CY2018Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	101400000	USD
CY2016	us-gaap	Investment Tax Credit InvestmentTaxCredit	1300000	USD
CY2017	us-gaap	Investment Tax Credit InvestmentTaxCredit	1100000	USD
CY2018	us-gaap	Investment Tax Credit InvestmentTaxCredit	1200000	USD
CY2018Q4	us-gaap	Jointly Owned Utility Plant Gross Ownership Amount Of Plant In Service JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService	1789400000	USD
CY2018Q4	us-gaap	Jointly Owned Utility Plant Ownership Amount Of Construction Work In Progress JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress	617000000	USD
CY2018Q4	us-gaap	Jointly Owned Utility Plant Ownership Amount Of Plant Accumulated Depreciation JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation	622300000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	14187800000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	15426000000	USD
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	2149000000	USD
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	1644100000	USD
CY2018Q4	us-gaap	Line Of Credit Facility Current Borrowing Capacity LineOfCreditFacilityCurrentBorrowingCapacity	1000000000	USD
CY2017Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	679800000	USD
CY2018Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	558800000	USD
CY2017Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	855700000	USD
CY2018Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	256500000	USD
CY2017Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	5447500000	USD
CY2018Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	5860800000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	256000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	408000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	333000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	8000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	657000000	USD
CY2017Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	4010600000	USD
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	5246300000	USD
CY2017Q4	us-gaap	Long Term Investments LongTermInvestments	396100000	USD
CY2018Q4	us-gaap	Long Term Investments LongTermInvestments	431300000	USD
CY2018	us-gaap	Long Term Purchase Commitment Amount LongTermPurchaseCommitmentAmount	2192000000	USD
CY2017Q4	us-gaap	Minority Interest Amount Represented By Preferred Stock MinorityInterestAmountRepresentedByPreferredStock	200000000	USD
CY2018Q4	us-gaap	Minority Interest Amount Represented By Preferred Stock MinorityInterestAmountRepresentedByPreferredStock	200000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	329300000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	532600000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	530700000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-720200000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1033400000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1066800000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	392800000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	521600000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	527700000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	381700000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	467500000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	522300000	USD
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	371500000	USD
CY2017Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	100400000	USD
CY2017Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	94300000	USD
CY2017Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	168800000	USD
CY2017Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	93800000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	457300000	USD
CY2018Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	120900000	USD
CY2018Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	100400000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	205500000	USD
CY2018Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	85300000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	512100000	USD
CY2016	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Change On Operating Results NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnOperatingResults	17100000	USD
CY2017	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Change On Operating Results NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnOperatingResults	17800000	USD
CY2016	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-110700000	USD
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-138400000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-124400000	USD
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	554100000	USD
CY2017Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	147200000	USD
CY2017Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	153700000	USD
CY2017Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	236300000	USD
CY2017Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	134000000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	671200000	USD
CY2018Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	165700000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	151200000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	256100000	USD
CY2018Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	121400000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	694400000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	30000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	5000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	2000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	3000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	3000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	5000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	12000000	USD
CY2018	us-gaap	Proceeds From Collection Of Retained Interest In Securitized Receivables ProceedsFromCollectionOfRetainedInterestInSecuritizedReceivables	605300000	USD
CY2016	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	26600000	USD
CY2017Q4	us-gaap	Other Assets Current OtherAssetsCurrent	46400000	USD
CY2018Q4	us-gaap	Other Assets Current OtherAssetsCurrent	80000000	USD
CY2017Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	69700000	USD
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	89700000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-100000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	2200000	USD
CY2016	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	589400000	USD
CY2017	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	633200000	USD
CY2018	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	645800000	USD
CY2017Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	260800000	USD
CY2018Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	260400000	USD
CY2017Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	306400000	USD
CY2018Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	287200000	USD
CY2017Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	121900000	USD
CY2018Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	137700000	USD
CY2016	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-800000	USD
CY2017	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-6700000	USD
CY2018	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-7800000	USD
CY2016	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-16600000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-17300000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-7600000	USD
CY2016	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-4800000	USD
CY2017	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	21700000	USD
CY2018	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	10600000	USD
CY2017Q4	us-gaap	Other Receivables OtherReceivables	84300000	USD
CY2018Q4	us-gaap	Other Receivables OtherReceivables	76300000	USD
CY2017Q4	us-gaap	Other Short Term Borrowings OtherShortTermBorrowings	95000000	USD
CY2018Q4	us-gaap	Other Short Term Borrowings OtherShortTermBorrowings	0	USD
CY2016	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-9800000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	28300000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	38200000	USD
CY2016	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	266500000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	288300000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	312200000	USD
CY2016	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1196800000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1466900000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1633900000	USD
CY2017Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	504000000	USD
CY2018Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	509100000	USD
CY2017Q4	us-gaap	Prepaid Taxes PrepaidTaxes	41300000	USD
CY2018Q4	us-gaap	Prepaid Taxes PrepaidTaxes	42200000	USD
CY2016	us-gaap	Proceeds From Collection Of Retained Interest In Securitized Receivables ProceedsFromCollectionOfRetainedInterestInSecuritizedReceivables	466800000	USD
CY2017	us-gaap	Proceeds From Collection Of Retained Interest In Securitized Receivables ProceedsFromCollectionOfRetainedInterestInSecuritizedReceivables	461800000	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	149600000	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	196600000	USD
CY2016	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	800000000	USD
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	550000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1500000000	USD
CY2016	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1700000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-45200000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-24000000	USD
CY2016	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	84300000	USD
CY2017	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	171100000	USD
CY2018	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	26000000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	11234500000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	12462400000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	436600000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	431700000	USD
CY2016	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	62500000	USD
CY2017	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	49700000	USD
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	75600000	USD
CY2017Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	4283100000	USD
CY2018Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	4314600000	USD
CY2017Q4	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	962200000	USD
CY2018Q4	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	1774800000	USD
CY2017Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	10797900000	USD
CY2018Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	12030700000	USD
CY2017Q4	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	6000000	USD
CY2018Q4	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	6100000	USD
CY2017Q4	us-gaap	Public Utilities Property Plant And Equipment Present Value Of Regulated Asset For Plant Abandonment PublicUtilitiesPropertyPlantAndEquipmentPresentValueOfRegulatedAssetForPlantAbandonment	93000000	USD
CY2018Q4	us-gaap	Public Utilities Property Plant And Equipment Present Value Of Regulated Asset For Plant Abandonment PublicUtilitiesPropertyPlantAndEquipmentPresentValueOfRegulatedAssetForPlantAbandonment	0	USD
CY2016	us-gaap	Regulated Operating Revenue Electric Non Nuclear RegulatedOperatingRevenueElectricNonNuclear	2875500000	USD
CY2017	us-gaap	Regulated Operating Revenue Electric Non Nuclear RegulatedOperatingRevenueElectricNonNuclear	2894700000	USD
CY2018	us-gaap	Regulated Operating Revenue Electric Non Nuclear RegulatedOperatingRevenueElectricNonNuclear	3000300000	USD
CY2016	us-gaap	Regulated Operating Revenue Gas RegulatedOperatingRevenueGas	355400000	USD
CY2017	us-gaap	Regulated Operating Revenue Gas RegulatedOperatingRevenueGas	400900000	USD
CY2018	us-gaap	Regulated Operating Revenue Gas RegulatedOperatingRevenueGas	446600000	USD
CY2016	us-gaap	Regulated Operating Revenue Other RegulatedOperatingRevenueOther	48600000	USD
CY2017	us-gaap	Regulated Operating Revenue Other RegulatedOperatingRevenueOther	47500000	USD
CY2018	us-gaap	Regulated Operating Revenue Other RegulatedOperatingRevenueOther	48000000	USD
CY2017Q4	us-gaap	Regulatory Assets RegulatoryAssets	1666700000	USD
CY2018Q4	us-gaap	Regulatory Assets RegulatoryAssets	1737300000	USD
CY2017Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	84300000	USD
CY2018Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	79800000	USD
CY2017Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1582400000	USD
CY2018Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1657500000	USD
CY2017Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	1497200000	USD
CY2018Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	1493200000	USD
CY2017Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	140000000	USD
CY2018Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	142700000	USD
CY2017Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	1357200000	USD
CY2018Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	1350500000	USD
CY2016	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	313400000	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	4600000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	855700000	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2346000000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2545900000	USD
CY2016	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3320000000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3382200000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3534500000	USD
CY2016	us-gaap	Revenues Revenues	3320000000	USD
CY2017Q1	us-gaap	Revenues Revenues	853900000	USD
CY2017Q2	us-gaap	Revenues Revenues	765300000	USD
CY2017Q3	us-gaap	Revenues Revenues	906900000	USD
CY2017Q4	us-gaap	Revenues Revenues	856100000	USD
CY2017	us-gaap	Revenues Revenues	3382200000	USD
CY2018Q1	us-gaap	Revenues Revenues	916300000	USD
CY2018Q2	us-gaap	Revenues Revenues	816100000	USD
CY2018Q3	us-gaap	Revenues Revenues	928600000	USD
CY2018Q4	us-gaap	Revenues Revenues	873500000	USD
CY2018	us-gaap	Revenues Revenues	3534500000	USD
CY2018Q4	us-gaap	Share Price SharePrice	42.25
CY2018Q4	us-gaap	Shares Issued Price Per Share SharesIssuedPricePerShare	44.33
CY2017Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.020
CY2018Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.028
CY2017	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	294300000	USD
CY2018	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	221400000	USD
CY2017	us-gaap	Shortterm Debt Maximum Amount Outstanding During Period ShorttermDebtMaximumAmountOutstandingDuringPeriod	424400000	USD
CY2018	us-gaap	Shortterm Debt Maximum Amount Outstanding During Period ShorttermDebtMaximumAmountOutstandingDuringPeriod	446500000	USD
CY2016	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	22408	shares
CY2017	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	5185	shares
CY2018	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	5078	shares
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	4062000000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	4182200000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	4585700000	USD
CY2015Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3924100000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4382200000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4785700000	USD
CY2016	us-gaap	Stockholders Equity Other StockholdersEquityOther	-6300000	USD
CY2017	us-gaap	Stockholders Equity Other StockholdersEquityOther	-1700000	USD
CY2018	us-gaap	Stockholders Equity Other StockholdersEquityOther	-4800000	USD
CY2016	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	102300000	USD
CY2017	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	105600000	USD
CY2018	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	104400000	USD
CY2018Q4	us-gaap	Trade Receivables Held For Sale Amount TradeReceivablesHeldForSaleAmount	90000000	USD
CY2016	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	40500000	USD
CY2017	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	229700000	shares
CY2017	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	39100000	USD
CY2018	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	39600000	USD
CY2016	us-gaap	Utilities Operating Expense Gas And Petroleum Purchased UtilitiesOperatingExpenseGasAndPetroleumPurchased	194300000	USD
CY2017	us-gaap	Utilities Operating Expense Gas And Petroleum Purchased UtilitiesOperatingExpenseGasAndPetroleumPurchased	211400000	USD
CY2018	us-gaap	Utilities Operating Expense Gas And Petroleum Purchased UtilitiesOperatingExpenseGasAndPetroleumPurchased	232300000	USD
CY2016	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	227100000	shares
CY2018	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	233600000	shares
CY2018	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Certain prior period amounts in the Financial Statements and Notes have been reclassified to conform to the current period presentation for comparative purposes, including modifications to the presentation of the components of net periodic benefit costs for defined benefit pension and other postretirement plans in the income statements, and restricted cash and cash receipts on sold receivables in the cash flows statements, as discussed in </font><a style="font-family:inherit;font-size:10pt;" href="#s70AECF8ABCF459D1930EE84A7A47C8AD"><font style="font-family:inherit;font-size:10pt;">Note 1(n)</font></a><font style="font-family:inherit;font-size:10pt;">.</font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></div>
CY2018	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The preparation of the financial statements requires management to make estimates and assumptions that affect: (a) the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements; and (b) the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.</font></div></div>

Files In Submission

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2018 Form 10-K Financial Statement

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$LNT ALLIANT ENERGY CORP Stock $lnt

2018 Form 10-K Financial Statement

#000035254119000013 Filed on February 22, 2019

Income Statement

Balance Sheet

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Facts In Submission

Files In Submission

$LNT
ALLIANT ENERGY CORP Stock $lnt