10-K Filing

ALLIANT ENERGY CORP CIK: 352541 FY 2013

Filing Information

Form Type	10-K
Accession Number	`0000352541-14-000006`
Period End Date	20131231
Filing Date	20140225
Fiscal Year	2013
Fiscal Period	FY
XBRL Instance	lnt-20131231.xml

Filing Contents

This filing contains the following financial statements:

Balance Sheet 145 Income Statement 150 Cash Flow Statement 113 Stockholders Equity 31

Balance Sheet 145 line items

Line Item	Tag	Value	Unit	Period
Other, accum depr.	`AccumulatedDepreciationOnPublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment`	$5.60M	USD	Point-in-time
Other, accum depr.	`AccumulatedDepreciationOnPublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment`	$5.60M	USD	Point-in-time
Non-regulated Generation, accum. depr.	`AccumulatedDepreciationOnPropertyPlantAndEquipmentNonRegulatedBusinessLine1`	$40.00M	USD	Point-in-time
Non-regulated Generation, accum. depr.	`AccumulatedDepreciationOnPropertyPlantAndEquipmentNonRegulatedBusinessLine1`	$31.00M	USD	Point-in-time
Electric plant	`PublicUtilitiesPropertyPlantAndEquipmentElectric`	$9.42B	USD	Point-in-time
Alliant Energy Corporate Services, Inc. and other, accum. depr.	`AccumulatedDepreciationOnPropertyPlantAndEquipmentNonRegulatedBusinessLine2`	$214.20M	USD	Point-in-time
Electric plant	`PublicUtilitiesPropertyPlantAndEquipmentElectric`	$9.07B	USD	Point-in-time
Alliant Energy Corporate Services, Inc. and other, accum. depr.	`AccumulatedDepreciationOnPropertyPlantAndEquipmentNonRegulatedBusinessLine2`	$200.20M	USD	Point-in-time
Gas plant	`PublicUtilitiesPropertyPlantAndEquipmentGas`	$878.40M	USD	Point-in-time
Common stock, par value (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$0.01	USD	Point-in-time
Gas plant	`PublicUtilitiesPropertyPlantAndEquipmentGas`	$909.90M	USD	Point-in-time
Common stock, par value (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$0.01	USD	Point-in-time
Common stock, shares authorized (in shares)	`CommonStockSharesAuthorized`	240.00M	shares	Point-in-time
Other plant	`PublicUtilitiesPropertyPlantAndEquipmentGeneral`	$547.90M	USD	Point-in-time
Common stock, shares authorized (in shares)	`CommonStockSharesAuthorized`	240.00M	shares	Point-in-time
Other plant	`PublicUtilitiesPropertyPlantAndEquipmentGeneral`	$506.20M	USD	Point-in-time
Common stock, shares outstanding (in shares)	`CommonStockSharesOutstanding`	110.89M	shares	Point-in-time
Common stock, shares outstanding (in shares)	`CommonStockSharesOutstanding`	110.99M	shares	Point-in-time
Common stock, shares outstanding (in shares)	`CommonStockSharesOutstanding`	111.02M	shares	Point-in-time
Accumulated depreciation (accum. depr.)	`PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation`	$3.73B	USD	Point-in-time
Common stock, shares outstanding (in shares)	`CommonStockSharesOutstanding`	110.94M	shares	Point-in-time
Accumulated depreciation (accum. depr.)	`PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation`	$3.51B	USD	Point-in-time
Shares in deferred compensation trust (in shares)	`CommonStockHeldInTrustShares`	227,469.00	shares	Point-in-time
Shares in deferred compensation trust (in shares)	`CommonStockHeldInTrustShares`	216,030.00	shares	Point-in-time
Net plant	`NetUtilityPlant`	$7.15B	USD	Point-in-time
Net plant	`NetUtilityPlant`	$6.94B	USD	Point-in-time
Shares in deferred compensation trust, weighted average cost per share (in dollars per share)	`CommonStockHeldInTrustWeightedAverageValuePerShare`	$35.25	USD	Point-in-time
Shares in deferred compensation trust, weighted average cost per share (in dollars per share)	`CommonStockHeldInTrustWeightedAverageValuePerShare`	$33.61	USD	Point-in-time
Columbia Energy Center Units 1 and 2 emission controls (WPL)	`ConstructionWorkInProgressBusinessLine4`	$130.40M	USD	Point-in-time
Columbia Energy Center Units 1 and 2 emission controls (WPL)	`ConstructionWorkInProgressBusinessLine4`	$265.00M	USD	Point-in-time
Ottumwa Generating Station Unit 1 emission controls (IPL)	`ConstructionWorkInProgressBusinessLine6`	$73.70M	USD	Point-in-time
Ottumwa Generating Station Unit 1 emission controls (IPL)	`ConstructionWorkInProgressBusinessLine6`	$135.10M	USD	Point-in-time
George Neal Generating Station Unit 3 emission controls (IPL)	`ConstructionWorkInProgressBusinessLine5`	$26.50M	USD	Point-in-time
George Neal Generating Station Unit 3 emission controls (IPL)	`ConstructionWorkInProgressBusinessLine5`	$54.60M	USD	Point-in-time
Other	`ConstructionWorkInProgressOther`	$188.20M	USD	Point-in-time
Other	`ConstructionWorkInProgressOther`	$223.20M	USD	Point-in-time
Other, less accum. depr.	`PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment`	$21.20M	USD	Point-in-time
Other, less accum. depr.	`PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment`	$22.30M	USD	Point-in-time
Total utility	`PublicUtilitiesPropertyPlantAndEquipmentNet`	$7.85B	USD	Point-in-time
Total utility	`PublicUtilitiesPropertyPlantAndEquipmentNet`	$7.38B	USD	Point-in-time
Non-regulated Generation, less accum. depr.	`PropertyPlantAndEquipmentNonregulatedBusinessLine1`	$249.40M	USD	Point-in-time
Non-regulated Generation, less accum. depr.	`PropertyPlantAndEquipmentNonregulatedBusinessLine1`	$258.60M	USD	Point-in-time
Alliant Energy Corporate Services, Inc. and other, less accum. depr.	`PropertyPlantAndEquipmentNonregulatedBusinessLine2`	$197.10M	USD	Point-in-time
Alliant Energy Corporate Services, Inc. and other, less accum. depr.	`PropertyPlantAndEquipmentNonregulatedBusinessLine2`	$229.60M	USD	Point-in-time
Total non-regulated and other	`PropertyPlantAndEquipmentOther`	$479.00M	USD	Point-in-time
Total non-regulated and other	`PropertyPlantAndEquipmentOther`	$455.70M	USD	Point-in-time
Total property, plant and equipment	`PropertyPlantAndEquipmentNet`	$8.33B	USD	Point-in-time
Total property, plant and equipment	`PropertyPlantAndEquipmentNet`	$7.84B	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$11.40M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$21.20M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$9.80M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$159.30M	USD	Point-in-time
Customer	`AccountsReceivableNetCurrent`	$81.80M	USD	Point-in-time
Customer	`AccountsReceivableNetCurrent`	$94.90M	USD	Point-in-time
Unbilled utility revenues	`CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear`	$92.30M	USD	Point-in-time
Unbilled utility revenues	`CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear`	$81.40M	USD	Point-in-time
Other	`OtherReceivables`	$299.20M	USD	Point-in-time
Other	`OtherReceivables`	$209.40M	USD	Point-in-time
Production fuel, at weighted average cost	`EnergyRelatedInventoryOtherFossilFuel`	$103.10M	USD	Point-in-time
Production fuel, at weighted average cost	`EnergyRelatedInventoryOtherFossilFuel`	$103.60M	USD	Point-in-time
Materials and supplies, at weighted average cost	`InventoryRawMaterialsAndSupplies`	$63.10M	USD	Point-in-time
Materials and supplies, at weighted average cost	`InventoryRawMaterialsAndSupplies`	$69.60M	USD	Point-in-time
Gas stored underground, at weighted average cost	`EnergyRelatedInventoryGasStoredUnderground`	$37.70M	USD	Point-in-time
Gas stored underground, at weighted average cost	`EnergyRelatedInventoryGasStoredUnderground`	$38.60M	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsCurrent`	$83.50M	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsCurrent`	$53.90M	USD	Point-in-time
Prepaid gross receipts tax	`PrepaidTaxes`	$40.40M	USD	Point-in-time
Prepaid gross receipts tax	`PrepaidTaxes`	$40.80M	USD	Point-in-time
Deferred income tax assets	`DeferredTaxAssetsNetCurrent`	$136.70M	USD	Point-in-time
Deferred income tax assets	`DeferredTaxAssetsNetCurrent`	$170.20M	USD	Point-in-time
Other	`OtherAssetsCurrent`	$84.90M	USD	Point-in-time
Other	`OtherAssetsCurrent`	$89.40M	USD	Point-in-time
Total current assets	`AssetsCurrent`	$1.01B	USD	Point-in-time
Total current assets	`AssetsCurrent`	$994.30M	USD	Point-in-time
Investment in American Transmission Company LLC	`InvestmentsBusinessLine1`	$257.00M	USD	Point-in-time
Investment in American Transmission Company LLC	`InvestmentsBusinessLine1`	$272.10M	USD	Point-in-time
Other	`OtherLongTermInvestmentsAndMarketableSecurities`	$57.50M	USD	Point-in-time
Other	`OtherLongTermInvestmentsAndMarketableSecurities`	$62.00M	USD	Point-in-time
Total investments	`LongTermInvestments`	$319.00M	USD	Point-in-time
Total investments	`LongTermInvestments`	$329.60M	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsNoncurrent`	$1.36B	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsNoncurrent`	$1.53B	USD	Point-in-time
Deferred charges and other	`OtherAssetsNoncurrent`	$85.80M	USD	Point-in-time
Deferred charges and other	`OtherAssetsNoncurrent`	$105.30M	USD	Point-in-time
Total other assets	`DeferredChargesRegulatoryAssetsAndOtherAssetsNoncurrent`	$1.63B	USD	Point-in-time
Total other assets	`DeferredChargesRegulatoryAssetsAndOtherAssetsNoncurrent`	$1.45B	USD	Point-in-time
Total assets	`Assets`	$11.11B	USD	Point-in-time
Total assets	`Assets`	$9.69B	USD	Point-in-time
Total assets	`Assets`	$10.79B	USD	Point-in-time
Common stock	`CommonStockValue`	$1.10M	USD	Point-in-time
Common stock	`CommonStockValue`	$1.10M	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapitalCommonStock`	$1.51B	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapitalCommonStock`	$1.51B	USD	Point-in-time
Retained earnings	`RetainedEarningsAccumulatedDeficit`	$1.78B	USD	Point-in-time
Retained earnings	`RetainedEarningsAccumulatedDeficit`	$1.63B	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-800.00K	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-200.00K	USD	Point-in-time
Shares in deferred compensation trust - 227,469 and 216,030 shares at a weighted average cost of $35.25 and $33.61 per share	`CommonStockHeldInTrust`	$8.00M	USD	Point-in-time
Shares in deferred compensation trust - 227,469 and 216,030 shares at a weighted average cost of $35.25 and $33.61 per share	`CommonStockHeldInTrust`	$7.30M	USD	Point-in-time
Total common equity	`StockholdersEquity`	$3.13B	USD	Point-in-time
Total common equity	`StockholdersEquity`	$3.01B	USD	Point-in-time
Total common equity	`StockholdersEquity`	$2.89B	USD	Point-in-time
Total common equity	`StockholdersEquity`	$3.28B	USD	Point-in-time
Cumulative preferred stock of Interstate Power and Light Company	`PreferredStockValue`	$145.10M	USD	Point-in-time
Cumulative preferred stock of Interstate Power and Light Company	`PreferredStockValue`	$200.00M	USD	Point-in-time
Noncontrolling interest	`MinorityInterest`	$1.80M	USD	Point-in-time
Noncontrolling interest	`MinorityInterest`	$1.80M	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.48B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.28B	USD	Point-in-time
Cumulative preferred stock of Wisconsin Power and Light Company	`TemporaryEquityCarryingAmountAttributableToParent`	-	USD	Point-in-time
Cumulative preferred stock of Wisconsin Power and Light Company	`TemporaryEquityCarryingAmountAttributableToParent`	$60.00M	USD	Point-in-time
Long-term debt, net (excluding current portion)	`LongTermDebtNoncurrent`	$2.98B	USD	Point-in-time
Long-term debt, net (excluding current portion)	`LongTermDebtNoncurrent`	$3.14B	USD	Point-in-time
Total capitalization	`CapitalizationLongtermDebtAndEquity`	$6.48B	USD	Point-in-time
Total capitalization	`CapitalizationLongtermDebtAndEquity`	$6.46B	USD	Point-in-time
Current maturities of long-term debt	`LongTermDebtCurrent`	$358.50M	USD	Point-in-time
Current maturities of long-term debt	`LongTermDebtCurrent`	$1.50M	USD	Point-in-time
Commercial paper	`CommercialPaper`	$217.50M	USD	Point-in-time
Commercial paper	`CommercialPaper`	$279.40M	USD	Point-in-time
Accounts payable	`AccountsPayableCurrent`	$339.30M	USD	Point-in-time
Accounts payable	`AccountsPayableCurrent`	$365.00M	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityCurrent`	$196.60M	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityCurrent`	$189.70M	USD	Point-in-time
Accrued taxes	`TaxesPayableCurrent`	$50.00M	USD	Point-in-time
Accrued taxes	`TaxesPayableCurrent`	$48.00M	USD	Point-in-time
Accrued interest	`InterestPayableCurrent`	$50.70M	USD	Point-in-time
Accrued interest	`InterestPayableCurrent`	$48.00M	USD	Point-in-time
Other	`OtherLiabilitiesCurrent`	$133.10M	USD	Point-in-time
Other	`OtherLiabilitiesCurrent`	$176.00M	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$1.43B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$1.02B	USD	Point-in-time
Deferred income tax liabilities	`DeferredTaxLiabilitiesNoncurrent`	$2.11B	USD	Point-in-time
Deferred income tax liabilities	`DeferredTaxLiabilitiesNoncurrent`	$1.93B	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityNoncurrent`	$726.40M	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityNoncurrent`	$624.90M	USD	Point-in-time
Pension and other benefit obligations	`PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent`	$364.00M	USD	Point-in-time
Pension and other benefit obligations	`PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent`	$206.60M	USD	Point-in-time
Other	`OtherLiabilitiesNoncurrent`	$273.90M	USD	Point-in-time
Other	`OtherLiabilitiesNoncurrent`	$262.50M	USD	Point-in-time
Total long-term liabilities and deferred credits	`TotalDeferredCreditsAndOtherLiabilities`	$3.22B	USD	Point-in-time
Total long-term liabilities and deferred credits	`TotalDeferredCreditsAndOtherLiabilities`	$3.29B	USD	Point-in-time
Commitments and contingencies (Note 16)	`CommitmentsAndContingencies`	-	USD	Point-in-time
Commitments and contingencies (Note 16)	`CommitmentsAndContingencies`	-	USD	Point-in-time
Total capitalization and liabilities	`LiabilitiesAndStockholdersEquity`	$10.79B	USD	Point-in-time
Total capitalization and liabilities	`LiabilitiesAndStockholdersEquity`	$11.11B	USD	Point-in-time

Income Statement 150 line items

Line Item	Tag	Value	Unit	Period
Electric	`ElectricDomesticRegulatedRevenue`	$2.64B	USD	Annual
Electric	`ElectricDomesticRegulatedRevenue`	$2.69B	USD	Annual
Electric	`ElectricDomesticRegulatedRevenue`	$2.59B	USD	Annual
Gas	`GasDomesticRegulatedRevenue`	$396.30M	USD	Annual
Gas	`GasDomesticRegulatedRevenue`	$464.80M	USD	Annual
Gas	`GasDomesticRegulatedRevenue`	$476.70M	USD	Annual
Other	`OtherSalesRevenueNet`	$56.70M	USD	Annual
Other	`OtherSalesRevenueNet`	$71.30M	USD	Annual
Other	`OtherSalesRevenueNet`	$62.00M	USD	Annual
Non-regulated	`UnregulatedOperatingRevenue`	$52.20M	USD	Annual
Non-regulated	`UnregulatedOperatingRevenue`	$51.70M	USD	Annual
Non-regulated	`UnregulatedOperatingRevenue`	$46.90M	USD	Annual
Total operating revenues	`Revenues`	$750.90M	USD	1 Quarter
Total operating revenues	`Revenues`	$887.60M	USD	1 Quarter
Total operating revenues	`Revenues`	$765.70M	USD	1 Quarter
Total operating revenues	`Revenues`	$832.60M	USD	1 Quarter
Total operating revenues	`Revenues`	$3.22B	USD	Annual
Total operating revenues	`Revenues`	$859.60M	USD	1 Quarter
Total operating revenues	`Revenues`	$718.00M	USD	1 Quarter
Total operating revenues	`Revenues`	$866.60M	USD	1 Quarter
Total operating revenues	`Revenues`	$3.28B	USD	Annual
Total operating revenues	`Revenues`	$3.09B	USD	Annual
Total operating revenues	`Revenues`	$690.30M	USD	1 Quarter
Electric production fuel and energy purchases	`CostElectricProductionFuelAndEnergyPurchases`	$725.00M	USD	Annual
Electric production fuel and energy purchases	`CostElectricProductionFuelAndEnergyPurchases`	$712.30M	USD	Annual
Electric production fuel and energy purchases	`CostElectricProductionFuelAndEnergyPurchases`	$764.50M	USD	Annual
Purchased electric capacity	`CostPurchasedElectricCapacity`	$271.50M	USD	Annual
Purchased electric capacity	`CostPurchasedElectricCapacity`	$257.20M	USD	Annual
Purchased electric capacity	`CostPurchasedElectricCapacity`	$216.80M	USD	Annual
Electric transmission service	`CostOfTransmission`	$341.30M	USD	Annual
Electric transmission service	`CostOfTransmission`	$418.30M	USD	Annual
Electric transmission service	`CostOfTransmission`	$323.80M	USD	Annual
Cost of gas sold	`CostOfGasSold`	$217.20M	USD	Annual
Cost of gas sold	`CostOfGasSold`	$295.20M	USD	Annual
Cost of gas sold	`CostOfGasSold`	$276.70M	USD	Annual
Other operation and maintenance	`UtilitiesOperatingExpenseMaintenanceAndOperations`	$590.00M	USD	Annual
Other operation and maintenance	`UtilitiesOperatingExpenseMaintenanceAndOperations`	$630.20M	USD	Annual
Other operation and maintenance	`UtilitiesOperatingExpenseMaintenanceAndOperations`	$620.70M	USD	Annual
Non-regulated operation and maintenance	`OtherCostAndExpenseOperating`	$14.90M	USD	Annual
Non-regulated operation and maintenance	`OtherCostAndExpenseOperating`	$18.00M	USD	Annual
Non-regulated operation and maintenance	`OtherCostAndExpenseOperating`	$11.90M	USD	Annual
Depreciation and amortization	`DepreciationAndAmortization`	$321.00M	USD	Annual
Depreciation and amortization	`DepreciationAndAmortization`	$370.90M	USD	Annual
Depreciation and amortization	`DepreciationAndAmortization`	$332.40M	USD	Annual
Taxes other than income taxes	`TaxesExcludingIncomeAndExciseTaxes`	$98.20M	USD	Annual
Taxes other than income taxes	`TaxesExcludingIncomeAndExciseTaxes`	$99.60M	USD	Annual
Taxes other than income taxes	`TaxesExcludingIncomeAndExciseTaxes`	$98.20M	USD	Annual
Total operating expenses	`CostsAndExpenses`	$2.57B	USD	Annual
Total operating expenses	`CostsAndExpenses`	$2.74B	USD	Annual
Total operating expenses	`CostsAndExpenses`	$2.71B	USD	Annual
Operating income	`OperatingIncomeLoss`	$519.70M	USD	Annual
Operating income	`OperatingIncomeLoss`	$103.20M	USD	1 Quarter
Operating income	`OperatingIncomeLoss`	$108.80M	USD	1 Quarter
Operating income	`OperatingIncomeLoss`	$533.90M	USD	Annual
Operating income	`OperatingIncomeLoss`	$201.40M	USD	1 Quarter
Operating income	`OperatingIncomeLoss`	$101.60M	USD	1 Quarter
Operating income	`OperatingIncomeLoss`	$120.70M	USD	1 Quarter
Operating income	`OperatingIncomeLoss`	$213.70M	USD	1 Quarter
Operating income	`OperatingIncomeLoss`	$95.60M	USD	1 Quarter
Operating income	`OperatingIncomeLoss`	$513.30M	USD	Annual
Operating income	`OperatingIncomeLoss`	$108.60M	USD	1 Quarter
Interest expense	`InterestExpense`	$158.30M	USD	Annual
Interest expense	`InterestExpense`	$156.70M	USD	Annual
Interest expense	`InterestExpense`	$172.80M	USD	Annual
Equity (income) loss from unconsolidated investments, net	`IncomeLossFromEquityMethodInvestments`	$43.70M	USD	Annual
Equity (income) loss from unconsolidated investments, net	`IncomeLossFromEquityMethodInvestments`	$39.30M	USD	Annual
Equity (income) loss from unconsolidated investments, net	`IncomeLossFromEquityMethodInvestments`	$41.30M	USD	Annual
Allowance for funds used during construction	`PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions`	$21.90M	USD	Annual
Allowance for funds used during construction	`PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions`	$12.00M	USD	Annual
Allowance for funds used during construction	`PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions`	$30.80M	USD	Annual
Interest income and other	`OtherNonoperatingIncomeExpense`	$4.30M	USD	Annual
Interest income and other	`OtherNonoperatingIncomeExpense`	$400.00K	USD	Annual
Interest income and other	`OtherNonoperatingIncomeExpense`	$4.00M	USD	Annual
Total interest expense and other	`NonoperatingIncomeExpense`	$-89.50M	USD	Annual
Total interest expense and other	`NonoperatingIncomeExpense`	$-97.90M	USD	Annual
Total interest expense and other	`NonoperatingIncomeExpense`	$-102.70M	USD	Annual
Income from continuing operations before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$410.60M	USD	Annual
Income from continuing operations before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$436.00M	USD	Annual
Income from continuing operations before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$430.20M	USD	Annual
Income tax expense (benefit)	`IncomeTaxExpenseBenefit`	$53.90M	USD	Annual
Income tax expense (benefit)	`IncomeTaxExpenseBenefit`	$69.20M	USD	Annual
Income tax expense (benefit)	`IncomeTaxExpenseBenefit`	$89.40M	USD	Annual
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$341.40M	USD	Annual
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$340.80M	USD	Annual
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$382.10M	USD	Annual
Loss from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$-19.50M	USD	Annual
Loss from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$-5.90M	USD	Annual
Loss from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$-5.10M	USD	Annual
Net income	`NetIncomeLoss`	$335.70M	USD	Annual
Net income	`NetIncomeLoss`	$376.20M	USD	Annual
Net income	`NetIncomeLoss`	$321.90M	USD	Annual
Preferred dividend requirements of subsidiaries	`DividendsPreferredStock`	$15.90M	USD	Annual
Preferred dividend requirements of subsidiaries	`DividendsPreferredStock`	$17.90M	USD	Annual
Preferred dividend requirements of subsidiaries	`DividendsPreferredStock`	$18.30M	USD	Annual
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$319.80M	USD	Annual
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$150.70M	USD	1 Quarter
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$65.90M	USD	1 Quarter
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$34.90M	USD	1 Quarter
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$65.50M	USD	1 Quarter
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$68.30M	USD	1 Quarter
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$157.60M	USD	1 Quarter
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$303.60M	USD	Annual
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$65.30M	USD	1 Quarter
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$69.90M	USD	1 Quarter
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$358.30M	USD	Annual
Weighted average number of common shares outstanding (basic and diluted) (000s) (in shares)	`WeightedAverageNumberOfShareOutstandingBasicAndDiluted`	110.80M	shares	Annual
Weighted average number of common shares outstanding (basic and diluted) (000s) (in shares)	`WeightedAverageNumberOfShareOutstandingBasicAndDiluted`	110.70M	shares	Annual
Weighted average number of common shares outstanding (basic and diluted) (000s) (in shares)	`WeightedAverageNumberOfShareOutstandingBasicAndDiluted`	110.80M	shares	Annual
Income from continuing operations, net of tax (in dollars per share)	`IncomeLossFromContinuingOperationsPerBasicAndDilutedShare`	$2.93	USD	Annual
Income from continuing operations, net of tax (in dollars per share)	`IncomeLossFromContinuingOperationsPerBasicAndDilutedShare`	$3.29	USD	Annual
Income from continuing operations, net of tax (in dollars per share)	`IncomeLossFromContinuingOperationsPerBasicAndDilutedShare`	$2.92	USD	Annual
Loss from discontinued operations, net of tax (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare`	$-0.06	USD	Annual
Loss from discontinued operations, net of tax (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare`	$-0.18	USD	Annual
Loss from discontinued operations, net of tax (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare`	$-0.04	USD	Annual
Net income (in dollars per share)	`EarningsPerShareBasicAndDiluted`	$2.89	USD	Annual
Net income (in dollars per share)	`EarningsPerShareBasicAndDiluted`	$2.74	USD	Annual
Net income (in dollars per share)	`EarningsPerShareBasicAndDiluted`	$3.23	USD	Annual
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperations`	$39.30M	USD	1 Quarter
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperations`	$323.10M	USD	Annual
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperations`	$65.50M	USD	1 Quarter
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperations`	$65.90M	USD	1 Quarter
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperations`	$324.90M	USD	Annual
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperations`	$71.10M	USD	1 Quarter
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperations`	$66.50M	USD	1 Quarter
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperations`	$72.90M	USD	1 Quarter
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperations`	$364.20M	USD	Annual
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperations`	$149.00M	USD	1 Quarter
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperations`	$158.90M	USD	1 Quarter
Loss from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$-1.30M	USD	1 Quarter
Loss from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$-4.40M	USD	1 Quarter
Loss from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$-600.00K	USD	1 Quarter
Loss from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$-5.10M	USD	Annual
Loss from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$-19.50M	USD	Annual
Loss from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$-2.80M	USD	1 Quarter
Loss from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$-1.00M	USD	1 Quarter
Loss from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$400.00K	USD	1 Quarter
Loss from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$-3.00M	USD	1 Quarter
Loss from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$-5.90M	USD	Annual
Loss from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$1.70M	USD	1 Quarter
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$319.80M	USD	Annual
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$150.70M	USD	1 Quarter
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$65.90M	USD	1 Quarter
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$34.90M	USD	1 Quarter
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$65.50M	USD	1 Quarter
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$68.30M	USD	1 Quarter
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$157.60M	USD	1 Quarter
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$303.60M	USD	Annual
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$65.30M	USD	1 Quarter
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$69.90M	USD	1 Quarter
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$358.30M	USD	Annual

Cash Flow Statement 113 line items

Line Item	Tag	Value	Unit	Period
Net income	`NetIncomeLoss`	$335.70M	USD	Annual
Net income	`NetIncomeLoss`	$376.20M	USD	Annual
Net income	`NetIncomeLoss`	$321.90M	USD	Annual
Depreciation and amortization	`AdjustmentDepreciationAndAmortizationIncludingDiscontinuedOperations`	$323.80M	USD	Annual
Depreciation and amortization	`AdjustmentDepreciationAndAmortizationIncludingDiscontinuedOperations`	$370.90M	USD	Annual
Depreciation and amortization	`AdjustmentDepreciationAndAmortizationIncludingDiscontinuedOperations`	$332.90M	USD	Annual
Other amortizations	`OtherAmortizationOfDeferredCharges`	$40.20M	USD	Annual
Other amortizations	`OtherAmortizationOfDeferredCharges`	$55.00M	USD	Annual
Other amortizations	`OtherAmortizationOfDeferredCharges`	$56.30M	USD	Annual
Deferred tax expense (benefit) and investment tax credits	`DeferredIncomeTaxesAndTaxCredits`	$108.30M	USD	Annual
Deferred tax expense (benefit) and investment tax credits	`DeferredIncomeTaxesAndTaxCredits`	$10.20M	USD	Annual
Deferred tax expense (benefit) and investment tax credits	`DeferredIncomeTaxesAndTaxCredits`	$143.30M	USD	Annual
Equity (income) loss from unconsolidated investments, net	`IncomeLossFromEquityMethodInvestments`	$43.70M	USD	Annual
Equity (income) loss from unconsolidated investments, net	`IncomeLossFromEquityMethodInvestments`	$39.30M	USD	Annual
Equity (income) loss from unconsolidated investments, net	`IncomeLossFromEquityMethodInvestments`	$41.30M	USD	Annual
Distributions from equity method investments	`EquityMethodInvestmentDividendsOrDistributions`	$35.40M	USD	Annual
Distributions from equity method investments	`EquityMethodInvestmentDividendsOrDistributions`	$34.20M	USD	Annual
Distributions from equity method investments	`EquityMethodInvestmentDividendsOrDistributions`	$32.30M	USD	Annual
Equity component of allowance for funds used during construction	`IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction`	$14.10M	USD	Annual
Equity component of allowance for funds used during construction	`IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction`	$20.30M	USD	Annual
Equity component of allowance for funds used during construction	`IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction`	$7.60M	USD	Annual
Non-cash valuation charges and other	`OtherNoncashIncomeExpense`	$-20.30M	USD	Annual
Non-cash valuation charges and other	`OtherNoncashIncomeExpense`	$3.70M	USD	Annual
Non-cash valuation charges and other	`OtherNoncashIncomeExpense`	$-700.00K	USD	Annual
Accounts receivable	`IncreaseDecreaseInAccountsReceivable`	$-61.30M	USD	Annual
Accounts receivable	`IncreaseDecreaseInAccountsReceivable`	$54.30M	USD	Annual
Accounts receivable	`IncreaseDecreaseInAccountsReceivable`	$49.20M	USD	Annual
Sales of accounts receivable	`IncreaseDecreaseInOtherReceivables`	$101.00M	USD	Annual
Sales of accounts receivable	`IncreaseDecreaseInOtherReceivables`	$10.00M	USD	Annual
Sales of accounts receivable	`IncreaseDecreaseInOtherReceivables`	$-75.00M	USD	Annual
Regulatory assets	`IncreaseDecreaseInOtherRegulatoryAssets`	$178.10M	USD	Annual
Regulatory assets	`IncreaseDecreaseInOtherRegulatoryAssets`	$-140.50M	USD	Annual
Regulatory assets	`IncreaseDecreaseInOtherRegulatoryAssets`	$413.10M	USD	Annual
Regulatory liabilities	`IncreaseDecreaseInRegulatoryLiabilities`	$-90.80M	USD	Annual
Regulatory liabilities	`IncreaseDecreaseInRegulatoryLiabilities`	$168.30M	USD	Annual
Regulatory liabilities	`IncreaseDecreaseInRegulatoryLiabilities`	$16.40M	USD	Annual
Deferred income taxes	`IncreaseDecreaseInDeferredIncomeTaxes`	$-147.30M	USD	Annual
Deferred income taxes	`IncreaseDecreaseInDeferredIncomeTaxes`	$-69.70M	USD	Annual
Deferred income taxes	`IncreaseDecreaseInDeferredIncomeTaxes`	$-101.90M	USD	Annual
Pension and other benefit obligations	`IncreaseDecreaseInPensionAndPostretirementObligations`	$51.30M	USD	Annual
Pension and other benefit obligations	`IncreaseDecreaseInPensionAndPostretirementObligations`	$-157.40M	USD	Annual
Pension and other benefit obligations	`IncreaseDecreaseInPensionAndPostretirementObligations`	$8.90M	USD	Annual
Other	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-23.70M	USD	Annual
Other	`IncreaseDecreaseInOtherOperatingCapitalNet`	$15.90M	USD	Annual
Other	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-52.70M	USD	Annual
Net cash flows from operating activities	`NetCashProvidedByUsedInOperatingActivities`	$731.00M	USD	Annual
Net cash flows from operating activities	`NetCashProvidedByUsedInOperatingActivities`	$702.70M	USD	Annual
Net cash flows from operating activities	`NetCashProvidedByUsedInOperatingActivities`	$841.10M	USD	Annual
Utility business - Riverside Energy Center	`PaymentsToAcquireProductiveAssetsBusinessLine1`	-	USD	Annual
Utility business - Riverside Energy Center	`PaymentsToAcquireProductiveAssetsBusinessLine1`	$403.50M	USD	Annual
Utility business - Riverside Energy Center	`PaymentsToAcquireProductiveAssetsBusinessLine1`	-	USD	Annual
Utility business - other	`PaymentsToAcquireProductiveAssetsOther`	$622.00M	USD	Annual
Utility business - other	`PaymentsToAcquireProductiveAssetsOther`	$731.60M	USD	Annual
Utility business - other	`PaymentsToAcquireProductiveAssetsOther`	$608.10M	USD	Annual
Alliant Energy Corporate Services, Inc. and non-regulated businesses	`PaymentsToAcquireProductiveAssetsBusinessLine2`	$132.60M	USD	Annual
Alliant Energy Corporate Services, Inc. and non-regulated businesses	`PaymentsToAcquireProductiveAssetsBusinessLine2`	$65.30M	USD	Annual
Alliant Energy Corporate Services, Inc. and non-regulated businesses	`PaymentsToAcquireProductiveAssetsBusinessLine2`	$66.70M	USD	Annual
Proceeds from Franklin County wind project cash grant	`ProceedsFromCashGrant`	-	USD	Annual
Proceeds from Franklin County wind project cash grant	`ProceedsFromCashGrant`	-	USD	Annual
Proceeds from Franklin County wind project cash grant	`ProceedsFromCashGrant`	$62.40M	USD	Annual
Collections of advances for customer energy efficiency projects	`CollectionsOfAdvancesForCustomerEnergyEfficiencyProjects`	$16.60M	USD	Annual
Collections of advances for customer energy efficiency projects	`CollectionsOfAdvancesForCustomerEnergyEfficiencyProjects`	$31.00M	USD	Annual
Collections of advances for customer energy efficiency projects	`CollectionsOfAdvancesForCustomerEnergyEfficiencyProjects`	$22.90M	USD	Annual
Other	`PaymentsForProceedsFromOtherInvestingActivities`	$20.30M	USD	Annual
Other	`PaymentsForProceedsFromOtherInvestingActivities`	$35.40M	USD	Annual
Other	`PaymentsForProceedsFromOtherInvestingActivities`	$9.70M	USD	Annual
Net cash flows used for investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-1.16B	USD	Annual
Net cash flows used for investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-652.10M	USD	Annual
Net cash flows used for investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-754.70M	USD	Annual
Common stock dividends	`PaymentsOfDividendsCommonStock`	$208.30M	USD	Annual
Common stock dividends	`PaymentsOfDividendsCommonStock`	$188.10M	USD	Annual
Common stock dividends	`PaymentsOfDividendsCommonStock`	$199.30M	USD	Annual
Preferred dividends paid by subsidiaries	`PaymentsOfDividendsPreferredStockAndPreferenceStock`	$11.40M	USD	Annual
Preferred dividends paid by subsidiaries	`PaymentsOfDividendsPreferredStockAndPreferenceStock`	$15.90M	USD	Annual
Preferred dividends paid by subsidiaries	`PaymentsOfDividendsPreferredStockAndPreferenceStock`	$16.80M	USD	Annual
Payments to redeem cumulative preferred stock	`PaymentsForRepurchaseOfRedeemablePreferredStock`	$40.00M	USD	Annual
Payments to redeem cumulative preferred stock	`PaymentsForRepurchaseOfRedeemablePreferredStock`	-	USD	Annual
Payments to redeem cumulative preferred stock	`PaymentsForRepurchaseOfRedeemablePreferredStock`	$211.00M	USD	Annual
Proceeds from issuance of cumulative preferred stock of IPL	`ProceedsFromIssuanceOfRedeemablePreferredStock`	-	USD	Annual
Proceeds from issuance of cumulative preferred stock of IPL	`ProceedsFromIssuanceOfRedeemablePreferredStock`	-	USD	Annual
Proceeds from issuance of cumulative preferred stock of IPL	`ProceedsFromIssuanceOfRedeemablePreferredStock`	$200.00M	USD	Annual
Proceeds from issuance of long-term debt	`ProceedsFromIssuanceOfLongTermDebt`	$400.00K	USD	Annual
Proceeds from issuance of long-term debt	`ProceedsFromIssuanceOfLongTermDebt`	$250.00M	USD	Annual
Proceeds from issuance of long-term debt	`ProceedsFromIssuanceOfLongTermDebt`	$385.00M	USD	Annual
Net change in commercial paper	`ProceedsFromRepaymentsOfShortTermDebt`	$55.40M	USD	Annual
Net change in commercial paper	`ProceedsFromRepaymentsOfShortTermDebt`	$164.70M	USD	Annual
Net change in commercial paper	`ProceedsFromRepaymentsOfShortTermDebt`	$11.90M	USD	Annual
Other	`ProceedsFromPaymentsForOtherFinancingActivities`	$-10.30M	USD	Annual
Other	`ProceedsFromPaymentsForOtherFinancingActivities`	$-9.40M	USD	Annual
Other	`ProceedsFromPaymentsForOtherFinancingActivities`	$-18.90M	USD	Annual
Net cash flows from (used for) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-198.50M	USD	Annual
Net cash flows from (used for) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$12.30M	USD	Annual
Net cash flows from (used for) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$324.20M	USD	Annual
Net increase (decrease) in cash and cash equivalents	`CashAndCashEquivalentsPeriodIncreaseDecrease`	$-147.90M	USD	Annual
Net increase (decrease) in cash and cash equivalents	`CashAndCashEquivalentsPeriodIncreaseDecrease`	$-11.40M	USD	Annual
Net increase (decrease) in cash and cash equivalents	`CashAndCashEquivalentsPeriodIncreaseDecrease`	$9.80M	USD	Annual
Cash and cash equivalents at beginning of period	`CashAndCashEquivalentsAtCarryingValue`	$11.40M	USD	Point-in-time
Cash and cash equivalents at beginning of period	`CashAndCashEquivalentsAtCarryingValue`	$21.20M	USD	Point-in-time
Cash and cash equivalents at beginning of period	`CashAndCashEquivalentsAtCarryingValue`	$9.80M	USD	Point-in-time
Cash and cash equivalents at beginning of period	`CashAndCashEquivalentsAtCarryingValue`	$159.30M	USD	Point-in-time
Cash and cash equivalents at end of period	`CashAndCashEquivalentsAtCarryingValue`	$11.40M	USD	Point-in-time
Cash and cash equivalents at end of period	`CashAndCashEquivalentsAtCarryingValue`	$21.20M	USD	Point-in-time
Cash and cash equivalents at end of period	`CashAndCashEquivalentsAtCarryingValue`	$9.80M	USD	Point-in-time
Cash and cash equivalents at end of period	`CashAndCashEquivalentsAtCarryingValue`	$159.30M	USD	Point-in-time
Interest, net of capitalized interest	`InterestPaidNet`	$157.60M	USD	Annual
Interest, net of capitalized interest	`InterestPaidNet`	$171.70M	USD	Annual
Interest, net of capitalized interest	`InterestPaidNet`	$155.20M	USD	Annual
Income taxes, net of refunds	`IncomeTaxesPaidNet`	$-10.80M	USD	Annual
Income taxes, net of refunds	`IncomeTaxesPaidNet`	$-20.30M	USD	Annual
Income taxes, net of refunds	`IncomeTaxesPaidNet`	$-9.60M	USD	Annual
Accrued capital expenditures	`CapitalExpendituresIncurredButNotYetPaid`	$49.70M	USD	Annual
Accrued capital expenditures	`CapitalExpendituresIncurredButNotYetPaid`	$105.30M	USD	Annual
Accrued capital expenditures	`CapitalExpendituresIncurredButNotYetPaid`	$103.80M	USD	Annual

Stockholders Equity 31 line items

Line Item	Tag	Value	Unit	Period
Common stock dividends (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$1.88	USD	Annual
Common stock dividends (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$1.70	USD	Annual
Common stock dividends (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$1.80	USD	Annual
Beginning balance	`StockholdersEquity`	$3.13B	USD	Point-in-time
Beginning balance	`StockholdersEquity`	$3.01B	USD	Point-in-time
Beginning balance	`StockholdersEquity`	$2.89B	USD	Point-in-time
Beginning balance	`StockholdersEquity`	$3.28B	USD	Point-in-time
Net income attributable to Alliant Energy common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$319.80M	USD	Annual
Net income attributable to Alliant Energy common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$150.70M	USD	1 Quarter
Net income attributable to Alliant Energy common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$65.90M	USD	1 Quarter
Net income attributable to Alliant Energy common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$34.90M	USD	1 Quarter
Net income attributable to Alliant Energy common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$65.50M	USD	1 Quarter
Net income attributable to Alliant Energy common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$68.30M	USD	1 Quarter
Net income attributable to Alliant Energy common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$157.60M	USD	1 Quarter
Net income attributable to Alliant Energy common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$303.60M	USD	Annual
Net income attributable to Alliant Energy common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$65.30M	USD	1 Quarter
Net income attributable to Alliant Energy common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$69.90M	USD	1 Quarter
Net income attributable to Alliant Energy common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$358.30M	USD	Annual
Common stock dividends	`DividendsCommonStock`	$208.30M	USD	Annual
Common stock dividends	`DividendsCommonStock`	$188.10M	USD	Annual
Common stock dividends	`DividendsCommonStock`	$199.30M	USD	Annual
Preferred stock issuance costs	`AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts`	$-5.40M	USD	Annual
Other	`StockholdersEquityOther`	$1.40M	USD	Annual
Other	`StockholdersEquityOther`	$1.30M	USD	Annual
Other	`StockholdersEquityOther`	$3.30M	USD	Annual
Other comprehensive income, net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$600.00K	USD	Annual
Other comprehensive income, net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$600.00K	USD	Annual
Ending balance	`StockholdersEquity`	$3.13B	USD	Point-in-time
Ending balance	`StockholdersEquity`	$3.01B	USD	Point-in-time
Ending balance	`StockholdersEquity`	$2.89B	USD	Point-in-time
Ending balance	`StockholdersEquity`	$3.28B	USD	Point-in-time

Data is extracted from SEC EDGAR XBRL filings. Values shown are as reported in the filing.