10-K Filing

ALLIANT ENERGY CORP CIK: 352541 FY 2017

Filing Information

Form Type	10-K
Accession Number	`0000352541-18-000019`
Period End Date	20171231
Filing Date	20180223
Fiscal Year	2017
Fiscal Period	FY
XBRL Instance	lnt-20171231.xml

Filing Contents

This filing contains the following financial statements:

Balance Sheet 95 Income Statement 147 Cash Flow Statement 104 Stockholders Equity 41

Balance Sheet 95 line items

Line Item	Tag	Value	Unit	Period
Common stock, par value (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$0.01	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`	480.00M	shares	Point-in-time
Common stock, shares authorized (in shares)	`CommonStockSharesAuthorized`	480.00M	shares	Point-in-time
Common stock, shares outstanding (in shares)	`CommonStockSharesOutstanding`	221.87M	shares	Point-in-time
Common stock, shares outstanding (in shares)	`CommonStockSharesOutstanding`	227.67M	shares	Point-in-time
Common stock, shares outstanding (in shares)	`CommonStockSharesOutstanding`	231.35M	shares	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$27.90M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$5.80M	USD	Point-in-time
Common stock, shares outstanding (in shares)	`CommonStockSharesOutstanding`	226.92M	shares	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$56.90M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$8.20M	USD	Point-in-time
Shares in deferred compensation trust (in shares)	`CommonStockHeldInTrustShares`	441,695.00	shares	Point-in-time
Shares in deferred compensation trust (in shares)	`CommonStockHeldInTrustShares`	463,365.00	shares	Point-in-time
Accounts receivable, less allowance for doubtful accounts	`AccountsReceivableNetCurrent`	$493.30M	USD	Point-in-time
Accounts receivable, less allowance for doubtful accounts	`AccountsReceivableNetCurrent`	$482.80M	USD	Point-in-time
Production fuel, at weighted average cost	`EnergyRelatedInventoryOtherFossilFuel`	$72.30M	USD	Point-in-time
Shares in deferred compensation trust, weighted average cost per share (in dollars per share)	`CommonStockHeldInTrustWeightedAverageValuePerShare`	$22.71	USD	Point-in-time
Production fuel, at weighted average cost	`EnergyRelatedInventoryOtherFossilFuel`	$98.10M	USD	Point-in-time
Shares in deferred compensation trust, weighted average cost per share (in dollars per share)	`CommonStockHeldInTrustWeightedAverageValuePerShare`	$23.91	USD	Point-in-time
Gas stored underground, at weighted average cost	`EnergyRelatedInventoryGasStoredUnderground`	$44.50M	USD	Point-in-time
Gas stored underground, at weighted average cost	`EnergyRelatedInventoryGasStoredUnderground`	$37.60M	USD	Point-in-time
Materials and supplies, at weighted average cost	`InventoryRawMaterialsAndSupplies`	$105.60M	USD	Point-in-time
Materials and supplies, at weighted average cost	`InventoryRawMaterialsAndSupplies`	$86.60M	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsCurrent`	$84.30M	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsCurrent`	$57.80M	USD	Point-in-time
Other	`OtherAssetsCurrent`	$87.70M	USD	Point-in-time
Other	`OtherAssetsCurrent`	$95.50M	USD	Point-in-time
Total current assets	`AssetsCurrent`	$877.10M	USD	Point-in-time
Total current assets	`AssetsCurrent`	$905.10M	USD	Point-in-time
Property, plant and equipment, net	`PropertyPlantAndEquipmentNet`	$10.28B	USD	Point-in-time
Property, plant and equipment, net	`PropertyPlantAndEquipmentNet`	$11.23B	USD	Point-in-time
ATC Investment	`InvestmentsBusinessLine1`	$274.20M	USD	Point-in-time
ATC Investment	`InvestmentsBusinessLine1`	$317.60M	USD	Point-in-time
Other	`OtherLongTermInvestments`	$121.90M	USD	Point-in-time
Other	`OtherLongTermInvestments`	$20.00M	USD	Point-in-time
Total investments	`LongTermInvestments`	$396.10M	USD	Point-in-time
Total investments	`LongTermInvestments`	$337.60M	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsNoncurrent`	$1.58B	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsNoncurrent`	$1.86B	USD	Point-in-time
Deferred charges and other	`OtherAssetsNoncurrent`	$69.70M	USD	Point-in-time
Deferred charges and other	`OtherAssetsNoncurrent`	$22.60M	USD	Point-in-time
Total other assets	`AssetsNoncurrent`	$1.65B	USD	Point-in-time
Total other assets	`AssetsNoncurrent`	$1.88B	USD	Point-in-time
Total assets	`Assets`	$13.37B	USD	Point-in-time
Total assets	`Assets`	$12.50B	USD	Point-in-time
Total assets	`Assets`	$14.19B	USD	Point-in-time
Current maturities of long-term debt	`LongTermDebtCurrent`	$4.60M	USD	Point-in-time
Current maturities of long-term debt	`LongTermDebtCurrent`	$855.70M	USD	Point-in-time
Commercial paper	`CommercialPaper`	$320.20M	USD	Point-in-time
Commercial paper	`CommercialPaper`	$244.10M	USD	Point-in-time
Other short-term borrowings	`OtherShortTermBorrowings`	-	USD	Point-in-time
Other short-term borrowings	`OtherShortTermBorrowings`	$95.00M	USD	Point-in-time
Accounts payable	`AccountsPayableCurrent`	$445.30M	USD	Point-in-time
Accounts payable	`AccountsPayableCurrent`	$477.30M	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityCurrent`	$186.20M	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityCurrent`	$140.00M	USD	Point-in-time
Other	`OtherLiabilitiesCurrent`	$260.80M	USD	Point-in-time
Other	`OtherLiabilitiesCurrent`	$281.80M	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$2.15B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$1.16B	USD	Point-in-time
Long-term debt, net (excluding current portion)	`LongTermDebtNoncurrent`	$4.01B	USD	Point-in-time
Long-term debt, net (excluding current portion)	`LongTermDebtNoncurrent`	$4.32B	USD	Point-in-time
Deferred tax liabilities	`DeferredTaxLiabilitiesNoncurrent`	$1.48B	USD	Point-in-time
Deferred tax liabilities	`DeferredTaxLiabilitiesNoncurrent`	$2.57B	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityNoncurrent`	$1.36B	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityNoncurrent`	$494.80M	USD	Point-in-time
Pension and other benefit obligations	`PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent`	$489.90M	USD	Point-in-time
Pension and other benefit obligations	`PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent`	$504.00M	USD	Point-in-time
Other	`OtherLiabilitiesNoncurrent`	$279.30M	USD	Point-in-time
Other	`OtherLiabilitiesNoncurrent`	$306.40M	USD	Point-in-time
Total other liabilities	`DeferredCreditsAndOtherLiabilities`	$3.65B	USD	Point-in-time
Total other liabilities	`DeferredCreditsAndOtherLiabilities`	$3.83B	USD	Point-in-time
Commitments and contingencies (Note 16)	`CommitmentsAndContingencies`	-	USD	Point-in-time
Commitments and contingencies (Note 16)	`CommitmentsAndContingencies`	-	USD	Point-in-time
Common stock	`CommonStockValue`	$2.30M	USD	Point-in-time
Common stock	`CommonStockValue`	$2.30M	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapitalCommonStock`	$1.85B	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapitalCommonStock`	$1.69B	USD	Point-in-time
Retained earnings	`RetainedEarningsAccumulatedDeficit`	$2.35B	USD	Point-in-time
Retained earnings	`RetainedEarningsAccumulatedDeficit`	$2.18B	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-500.00K	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-400.00K	USD	Point-in-time
Shares in deferred compensation trust - 463,365 and 441,695 shares at a weighted average cost of $23.91 and $22.71 per share	`CommonStockHeldInTrust`	$10.00M	USD	Point-in-time
Shares in deferred compensation trust - 463,365 and 441,695 shares at a weighted average cost of $23.91 and $22.71 per share	`CommonStockHeldInTrust`	$11.10M	USD	Point-in-time
Total common equity	`StockholdersEquity`	$3.86B	USD	Point-in-time
Total common equity	`StockholdersEquity`	$3.72B	USD	Point-in-time
Total common equity	`StockholdersEquity`	$3.44B	USD	Point-in-time
Total common equity	`StockholdersEquity`	$4.18B	USD	Point-in-time
Cumulative preferred stock of Interstate Power and Light Company	`MinorityInterestAmountRepresentedByPreferredStock`	$200.00M	USD	Point-in-time
Cumulative preferred stock of Interstate Power and Light Company	`MinorityInterestAmountRepresentedByPreferredStock`	$200.00M	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.06B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.38B	USD	Point-in-time
Total liabilities and equity	`LiabilitiesAndStockholdersEquity`	$13.37B	USD	Point-in-time
Total liabilities and equity	`LiabilitiesAndStockholdersEquity`	$14.19B	USD	Point-in-time

Income Statement 147 line items

Line Item	Tag	Value	Unit	Period
Electric utility	`ElectricDomesticRegulatedRevenue`	$2.88B	USD	Annual
Electric utility	`ElectricDomesticRegulatedRevenue`	$2.89B	USD	Annual
Electric utility	`ElectricDomesticRegulatedRevenue`	$2.77B	USD	Annual
Gas utility	`GasDomesticRegulatedRevenue`	$355.40M	USD	Annual
Gas utility	`GasDomesticRegulatedRevenue`	$381.20M	USD	Annual
Gas utility	`GasDomesticRegulatedRevenue`	$400.90M	USD	Annual
Other utility	`OtherSalesRevenueNet`	$48.60M	USD	Annual
Other utility	`OtherSalesRevenueNet`	$57.90M	USD	Annual
Other utility	`OtherSalesRevenueNet`	$47.50M	USD	Annual
Non-utility	`UnregulatedOperatingRevenue`	$44.00M	USD	Annual
Non-utility	`UnregulatedOperatingRevenue`	$39.10M	USD	Annual
Non-utility	`UnregulatedOperatingRevenue`	$40.50M	USD	Annual
Total operating revenues	`Revenues`	$856.10M	USD	1 Quarter
Total operating revenues	`Revenues`	$853.90M	USD	1 Quarter
Total operating revenues	`Revenues`	$906.90M	USD	1 Quarter
Total operating revenues	`Revenues`	$754.60M	USD	1 Quarter
Total operating revenues	`Revenues`	$924.60M	USD	1 Quarter
Total operating revenues	`Revenues`	$3.25B	USD	Annual
Total operating revenues	`Revenues`	$797.00M	USD	1 Quarter
Total operating revenues	`Revenues`	$765.30M	USD	1 Quarter
Total operating revenues	`Revenues`	$3.38B	USD	Annual
Total operating revenues	`Revenues`	$843.80M	USD	1 Quarter
Total operating revenues	`Revenues`	$3.32B	USD	Annual
Electric production fuel and purchased power	`ElectricProductionExpense`	$818.10M	USD	Annual
Electric production fuel and purchased power	`ElectricProductionExpense`	$837.70M	USD	Annual
Electric production fuel and purchased power	`ElectricProductionExpense`	$854.00M	USD	Annual
Electric transmission service	`CostOfTransmission`	$480.90M	USD	Annual
Electric transmission service	`CostOfTransmission`	$485.30M	USD	Annual
Electric transmission service	`CostOfTransmission`	$527.90M	USD	Annual
Cost of gas sold	`CostOfDomesticRegulatedGasRevenue`	$194.30M	USD	Annual
Cost of gas sold	`CostOfDomesticRegulatedGasRevenue`	$219.10M	USD	Annual
Cost of gas sold	`CostOfDomesticRegulatedGasRevenue`	$211.40M	USD	Annual
Asset valuation charges for Franklin County wind farm	`ImpairmentOfLongLivedAssetsHeldForUse`	-	USD	Annual
Asset valuation charges for Franklin County wind farm	`ImpairmentOfLongLivedAssetsHeldForUse`	-	USD	Annual
Asset valuation charges for Franklin County wind farm	`ImpairmentOfLongLivedAssetsHeldForUse`	$86.40M	USD	Annual
Other operation and maintenance	`OtherCostAndExpenseOperating`	$629.50M	USD	Annual
Other operation and maintenance	`OtherCostAndExpenseOperating`	$651.00M	USD	Annual
Other operation and maintenance	`OtherCostAndExpenseOperating`	$606.50M	USD	Annual
Depreciation and amortization	`DepreciationAndAmortization`	$411.60M	USD	Annual
Depreciation and amortization	`DepreciationAndAmortization`	$461.80M	USD	Annual
Depreciation and amortization	`DepreciationAndAmortization`	$401.30M	USD	Annual
Taxes other than income taxes	`TaxesExcludingIncomeAndExciseTaxes`	$105.60M	USD	Annual
Taxes other than income taxes	`TaxesExcludingIncomeAndExciseTaxes`	$102.30M	USD	Annual
Taxes other than income taxes	`TaxesExcludingIncomeAndExciseTaxes`	$103.70M	USD	Annual
Total operating expenses	`CostsAndExpenses`	$2.73B	USD	Annual
Total operating expenses	`CostsAndExpenses`	$2.78B	USD	Annual
Total operating expenses	`CostsAndExpenses`	$2.68B	USD	Annual
Operating income (loss)	`OperatingIncomeLoss`	$128.60M	USD	1 Quarter
Operating income (loss)	`OperatingIncomeLoss`	$653.40M	USD	Annual
Operating income (loss)	`OperatingIncomeLoss`	$231.50M	USD	1 Quarter
Operating income (loss)	`OperatingIncomeLoss`	$162.60M	USD	1 Quarter
Operating income (loss)	`OperatingIncomeLoss`	$577.00M	USD	Annual
Operating income (loss)	`OperatingIncomeLoss`	$149.30M	USD	1 Quarter
Operating income (loss)	`OperatingIncomeLoss`	$145.90M	USD	1 Quarter
Operating income (loss)	`OperatingIncomeLoss`	$142.90M	USD	1 Quarter
Operating income (loss)	`OperatingIncomeLoss`	$129.70M	USD	1 Quarter
Operating income (loss)	`OperatingIncomeLoss`	$537.00M	USD	Annual
Operating income (loss)	`OperatingIncomeLoss`	$99.90M	USD	1 Quarter
Interest expense	`InterestExpense`	$215.60M	USD	Annual
Interest expense	`InterestExpense`	$187.10M	USD	Annual
Interest expense	`InterestExpense`	$196.20M	USD	Annual
Equity (income) loss from unconsolidated investments, net	`IncomeLossFromEquityMethodInvestments`	$44.80M	USD	Annual
Equity (income) loss from unconsolidated investments, net	`IncomeLossFromEquityMethodInvestments`	$39.60M	USD	Annual
Equity (income) loss from unconsolidated investments, net	`IncomeLossFromEquityMethodInvestments`	$33.80M	USD	Annual
Allowance for funds used during construction	`PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions`	$62.50M	USD	Annual
Allowance for funds used during construction	`PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions`	$36.90M	USD	Annual
Allowance for funds used during construction	`PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions`	$49.70M	USD	Annual
Interest income and other	`OtherNonoperatingIncomeExpense`	$500.00K	USD	Annual
Interest income and other	`OtherNonoperatingIncomeExpense`	$500.00K	USD	Annual
Interest income and other	`OtherNonoperatingIncomeExpense`	$700.00K	USD	Annual
Total interest expense and other	`NonoperatingIncomeExpense`	$-120.60M	USD	Annual
Total interest expense and other	`NonoperatingIncomeExpense`	$-93.60M	USD	Annual
Total interest expense and other	`NonoperatingIncomeExpense`	$-115.70M	USD	Annual
Income from continuing operations before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$532.80M	USD	Annual
Income from continuing operations before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$461.30M	USD	Annual
Income from continuing operations before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$443.40M	USD	Annual
Income tax expense (benefit)	`IncomeTaxExpenseBenefit`	$59.40M	USD	Annual
Income tax expense (benefit)	`IncomeTaxExpenseBenefit`	$70.40M	USD	Annual
Income tax expense (benefit)	`IncomeTaxExpenseBenefit`	$66.70M	USD	Annual
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$466.10M	USD	Annual
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$390.90M	USD	Annual
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$384.00M	USD	Annual
Income (loss) from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$-2.50M	USD	Annual
Income (loss) from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$-2.30M	USD	Annual
Income (loss) from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$1.40M	USD	Annual
Net income	`NetIncomeLoss`	$467.50M	USD	Annual
Net income	`NetIncomeLoss`	$381.70M	USD	Annual
Net income	`NetIncomeLoss`	$388.40M	USD	Annual
Preferred dividend requirements of Interstate Power and Light Company	`DividendsPreferredStock`	$10.20M	USD	Annual
Preferred dividend requirements of Interstate Power and Light Company	`DividendsPreferredStock`	$10.20M	USD	Annual
Preferred dividend requirements of Interstate Power and Light Company	`DividendsPreferredStock`	$10.20M	USD	Annual
Net income attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$128.40M	USD	1 Quarter
Net income attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$457.30M	USD	Annual
Net income attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$96.50M	USD	1 Quarter
Net income attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$62.70M	USD	1 Quarter
Net income attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$378.20M	USD	Annual
Net income attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$93.80M	USD	1 Quarter
Net income attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$100.40M	USD	1 Quarter
Net income attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$371.50M	USD	Annual
Net income attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$168.80M	USD	1 Quarter
Net income attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$83.90M	USD	1 Quarter
Net income attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$94.30M	USD	1 Quarter
Weighted average number of common shares outstanding (basic and diluted) (in shares)	`WeightedAverageNumberOfShareOutstandingBasicAndDiluted`	229.70M	shares	Annual
Weighted average number of common shares outstanding (basic and diluted) (in shares)	`WeightedAverageNumberOfShareOutstandingBasicAndDiluted`	225.40M	shares	Annual
Weighted average number of common shares outstanding (basic and diluted) (in shares)	`WeightedAverageNumberOfShareOutstandingBasicAndDiluted`	227.10M	shares	Annual
Income from continuing operations, net of tax (in dollars per share)	`IncomeLossFromContinuingOperationsPerBasicAndDilutedShare`	$1.65	USD	Annual
Income from continuing operations, net of tax (in dollars per share)	`IncomeLossFromContinuingOperationsPerBasicAndDilutedShare`	$1.99	USD	Annual
Income from continuing operations, net of tax (in dollars per share)	`IncomeLossFromContinuingOperationsPerBasicAndDilutedShare`	$1.69	USD	Annual
Loss from discontinued operations, net of tax (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare`	-	USD	Annual
Loss from discontinued operations, net of tax (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare`	$-0.01	USD	Annual
Loss from discontinued operations, net of tax (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare`	$-0.01	USD	Annual
Net income (in dollars per share)	`EarningsPerShareBasicAndDiluted`	$1.64	USD	Annual
Net income (in dollars per share)	`EarningsPerShareBasicAndDiluted`	$1.99	USD	Annual
Net income (in dollars per share)	`EarningsPerShareBasicAndDiluted`	$1.68	USD	Annual
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperations`	$97.60M	USD	1 Quarter
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperations`	$84.40M	USD	1 Quarter
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperations`	$99.00M	USD	1 Quarter
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperations`	$373.80M	USD	Annual
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperations`	$128.80M	USD	1 Quarter
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperations`	$168.80M	USD	1 Quarter
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperations`	$94.30M	USD	1 Quarter
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperations`	$63.00M	USD	1 Quarter
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperations`	$455.90M	USD	Annual
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperations`	$380.70M	USD	Annual
Income from continuing operations, net of tax	`IncomeLossFromContinuingOperations`	$93.80M	USD	1 Quarter
Income (loss) from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	-	USD	1 Quarter
Income (loss) from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$1.40M	USD	Annual
Income (loss) from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$-2.50M	USD	Annual
Income (loss) from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$-400.00K	USD	1 Quarter
Income (loss) from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$-1.10M	USD	1 Quarter
Income (loss) from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	-	USD	1 Quarter
Income (loss) from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$-500.00K	USD	1 Quarter
Income (loss) from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$-2.30M	USD	Annual
Income (loss) from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$1.40M	USD	1 Quarter
Income (loss) from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$-300.00K	USD	1 Quarter
Income (loss) from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	-	USD	1 Quarter
Net income	`NetIncomeLossAvailableToCommonStockholdersBasic`	$128.40M	USD	1 Quarter
Net income	`NetIncomeLossAvailableToCommonStockholdersBasic`	$457.30M	USD	Annual
Net income	`NetIncomeLossAvailableToCommonStockholdersBasic`	$96.50M	USD	1 Quarter
Net income	`NetIncomeLossAvailableToCommonStockholdersBasic`	$62.70M	USD	1 Quarter
Net income	`NetIncomeLossAvailableToCommonStockholdersBasic`	$378.20M	USD	Annual
Net income	`NetIncomeLossAvailableToCommonStockholdersBasic`	$93.80M	USD	1 Quarter
Net income	`NetIncomeLossAvailableToCommonStockholdersBasic`	$100.40M	USD	1 Quarter
Net income	`NetIncomeLossAvailableToCommonStockholdersBasic`	$371.50M	USD	Annual
Net income	`NetIncomeLossAvailableToCommonStockholdersBasic`	$168.80M	USD	1 Quarter
Net income	`NetIncomeLossAvailableToCommonStockholdersBasic`	$83.90M	USD	1 Quarter
Net income	`NetIncomeLossAvailableToCommonStockholdersBasic`	$94.30M	USD	1 Quarter

Cash Flow Statement 104 line items

Line Item	Tag	Value	Unit	Period
Net income	`NetIncomeLoss`	$467.50M	USD	Annual
Net income	`NetIncomeLoss`	$381.70M	USD	Annual
Net income	`NetIncomeLoss`	$388.40M	USD	Annual
Depreciation and amortization	`AdjustmentDepreciationAndAmortizationIncludingDiscontinuedOperations`	$411.60M	USD	Annual
Depreciation and amortization	`AdjustmentDepreciationAndAmortizationIncludingDiscontinuedOperations`	$401.30M	USD	Annual
Depreciation and amortization	`AdjustmentDepreciationAndAmortizationIncludingDiscontinuedOperations`	$461.80M	USD	Annual
Other amortizations	`OtherOperatingActivitiesCashFlowStatement`	$12.40M	USD	Annual
Other amortizations	`OtherOperatingActivitiesCashFlowStatement`	$21.70M	USD	Annual
Other amortizations	`OtherOperatingActivitiesCashFlowStatement`	$-4.80M	USD	Annual
Deferred tax expense and tax credits	`DeferredIncomeTaxesAndTaxCredits`	$139.60M	USD	Annual
Deferred tax expense and tax credits	`DeferredIncomeTaxesAndTaxCredits`	$114.20M	USD	Annual
Deferred tax expense and tax credits	`DeferredIncomeTaxesAndTaxCredits`	$84.60M	USD	Annual
Equity (income) loss from unconsolidated investments, net	`IncomeLossFromEquityMethodInvestments`	$44.80M	USD	Annual
Equity (income) loss from unconsolidated investments, net	`IncomeLossFromEquityMethodInvestments`	$39.60M	USD	Annual
Equity (income) loss from unconsolidated investments, net	`IncomeLossFromEquityMethodInvestments`	$33.80M	USD	Annual
Distributions from equity method investments	`EquityMethodInvestmentDividendsOrDistributions`	$30.60M	USD	Annual
Distributions from equity method investments	`EquityMethodInvestmentDividendsOrDistributions`	$28.30M	USD	Annual
Distributions from equity method investments	`EquityMethodInvestmentDividendsOrDistributions`	$38.10M	USD	Annual
Equity component of allowance for funds used during construction	`IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction`	$24.40M	USD	Annual
Equity component of allowance for funds used during construction	`IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction`	$33.60M	USD	Annual
Equity component of allowance for funds used during construction	`IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction`	$42.30M	USD	Annual
Asset valuation charges for Franklin County wind farm	`ImpairmentOfLongLivedAssetsHeldForUse`	-	USD	Annual
Asset valuation charges for Franklin County wind farm	`ImpairmentOfLongLivedAssetsHeldForUse`	-	USD	Annual
Asset valuation charges for Franklin County wind farm	`ImpairmentOfLongLivedAssetsHeldForUse`	$86.40M	USD	Annual
Other	`OtherNoncashIncomeExpense`	$-6.70M	USD	Annual
Other	`OtherNoncashIncomeExpense`	$-800.00K	USD	Annual
Other	`OtherNoncashIncomeExpense`	$-15.70M	USD	Annual
Accounts receivable	`IncreaseDecreaseInAccountsReceivable`	$-36.80M	USD	Annual
Accounts receivable	`IncreaseDecreaseInAccountsReceivable`	$-29.60M	USD	Annual
Accounts receivable	`IncreaseDecreaseInAccountsReceivable`	$121.40M	USD	Annual
Sales of accounts receivable	`IncreaseDecreaseInOtherReceivables`	$17.00M	USD	Annual
Sales of accounts receivable	`IncreaseDecreaseInOtherReceivables`	$-16.00M	USD	Annual
Sales of accounts receivable	`IncreaseDecreaseInOtherReceivables`	$9.00M	USD	Annual
Regulatory assets	`IncreaseDecreaseInOtherRegulatoryAssets`	$104.50M	USD	Annual
Regulatory assets	`IncreaseDecreaseInOtherRegulatoryAssets`	$3.60M	USD	Annual
Regulatory assets	`IncreaseDecreaseInOtherRegulatoryAssets`	$130.80M	USD	Annual
Regulatory liabilities	`IncreaseDecreaseInRegulatoryLiabilities`	$-63.00M	USD	Annual
Regulatory liabilities	`IncreaseDecreaseInRegulatoryLiabilities`	$-67.80M	USD	Annual
Regulatory liabilities	`IncreaseDecreaseInRegulatoryLiabilities`	$-83.80M	USD	Annual
Deferred income taxes	`IncreaseDecreaseInDeferredIncomeTaxes`	$-94.60M	USD	Annual
Deferred income taxes	`IncreaseDecreaseInDeferredIncomeTaxes`	$-81.70M	USD	Annual
Deferred income taxes	`IncreaseDecreaseInDeferredIncomeTaxes`	$-102.40M	USD	Annual
Other	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-38.70M	USD	Annual
Other	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-24.70M	USD	Annual
Other	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-22.50M	USD	Annual
Net cash flows from operating activities	`NetCashProvidedByUsedInOperatingActivities`	$983.40M	USD	Annual
Net cash flows from operating activities	`NetCashProvidedByUsedInOperatingActivities`	$871.20M	USD	Annual
Net cash flows from operating activities	`NetCashProvidedByUsedInOperatingActivities`	$859.60M	USD	Annual
Utility construction and acquisition expenditures	`PaymentsToAcquireProductiveAssetsOther`	$1.28B	USD	Annual
Utility construction and acquisition expenditures	`PaymentsToAcquireProductiveAssetsOther`	$1.13B	USD	Annual
Utility construction and acquisition expenditures	`PaymentsToAcquireProductiveAssetsOther`	$960.30M	USD	Annual
Other construction and acquisition expenditures	`PaymentsToAcquireProductiveAssetsBusinessLine2`	$74.00M	USD	Annual
Other construction and acquisition expenditures	`PaymentsToAcquireProductiveAssetsBusinessLine2`	$185.10M	USD	Annual
Other construction and acquisition expenditures	`PaymentsToAcquireProductiveAssetsBusinessLine2`	$65.60M	USD	Annual
Proceeds from Minnesota electric and natural gas distribution asset sales	`ProceedsFromSaleOfProductiveAssets`	-	USD	Annual
Proceeds from Minnesota electric and natural gas distribution asset sales	`ProceedsFromSaleOfProductiveAssets`	-	USD	Annual
Proceeds from Minnesota electric and natural gas distribution asset sales	`ProceedsFromSaleOfProductiveAssets`	$139.90M	USD	Annual
Other	`PaymentsForProceedsFromOtherInvestingActivities`	$24.80M	USD	Annual
Other	`PaymentsForProceedsFromOtherInvestingActivities`	$29.40M	USD	Annual
Other	`PaymentsForProceedsFromOtherInvestingActivities`	$-10.30M	USD	Annual
Net cash flows from (used for) investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-1.50B	USD	Annual
Net cash flows from (used for) investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-1.19B	USD	Annual
Net cash flows from (used for) investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-919.20M	USD	Annual
Common stock dividends	`PaymentsOfDividendsCommonStock`	$247.30M	USD	Annual
Common stock dividends	`PaymentsOfDividendsCommonStock`	$288.30M	USD	Annual
Common stock dividends	`PaymentsOfDividendsCommonStock`	$266.50M	USD	Annual
Proceeds from issuance of common stock, net	`ProceedsFromIssuanceOfCommonStock`	$149.60M	USD	Annual
Proceeds from issuance of common stock, net	`ProceedsFromIssuanceOfCommonStock`	$151.20M	USD	Annual
Proceeds from issuance of common stock, net	`ProceedsFromIssuanceOfCommonStock`	$26.60M	USD	Annual
Proceeds from issuance of long-term debt	`ProceedsFromIssuanceOfLongTermDebt`	$800.00M	USD	Annual
Proceeds from issuance of long-term debt	`ProceedsFromIssuanceOfLongTermDebt`	$250.70M	USD	Annual
Proceeds from issuance of long-term debt	`ProceedsFromIssuanceOfLongTermDebt`	$550.00M	USD	Annual
Payments to retire long-term debt	`RepaymentsOfLongTermDebt`	$183.00M	USD	Annual
Payments to retire long-term debt	`RepaymentsOfLongTermDebt`	$313.40M	USD	Annual
Payments to retire long-term debt	`RepaymentsOfLongTermDebt`	$4.60M	USD	Annual
Net change in commercial paper and other short-term borrowings	`ProceedsFromRepaymentsOfShortTermDebt`	$171.10M	USD	Annual
Net change in commercial paper and other short-term borrowings	`ProceedsFromRepaymentsOfShortTermDebt`	$84.30M	USD	Annual
Net change in commercial paper and other short-term borrowings	`ProceedsFromRepaymentsOfShortTermDebt`	$18.50M	USD	Annual
Other	`ProceedsFromPaymentsForOtherFinancingActivities`	$-45.20M	USD	Annual
Other	`ProceedsFromPaymentsForOtherFinancingActivities`	$6.80M	USD	Annual
Other	`ProceedsFromPaymentsForOtherFinancingActivities`	$-1.70M	USD	Annual
Net cash flows from (used for) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$329.30M	USD	Annual
Net cash flows from (used for) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-3.10M	USD	Annual
Net cash flows from (used for) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$532.60M	USD	Annual
Net increase (decrease) in cash and cash equivalents	`CashAndCashEquivalentsPeriodIncreaseDecrease`	$19.70M	USD	Annual
Net increase (decrease) in cash and cash equivalents	`CashAndCashEquivalentsPeriodIncreaseDecrease`	$-51.10M	USD	Annual
Net increase (decrease) in cash and cash equivalents	`CashAndCashEquivalentsPeriodIncreaseDecrease`	$2.40M	USD	Annual
Cash and cash equivalents at beginning of period	`CashAndCashEquivalentsAtCarryingValue`	$27.90M	USD	Point-in-time
Cash and cash equivalents at beginning of period	`CashAndCashEquivalentsAtCarryingValue`	$5.80M	USD	Point-in-time
Cash and cash equivalents at beginning of period	`CashAndCashEquivalentsAtCarryingValue`	$56.90M	USD	Point-in-time
Cash and cash equivalents at beginning of period	`CashAndCashEquivalentsAtCarryingValue`	$8.20M	USD	Point-in-time
Cash and cash equivalents at end of period	`CashAndCashEquivalentsAtCarryingValue`	$27.90M	USD	Point-in-time
Cash and cash equivalents at end of period	`CashAndCashEquivalentsAtCarryingValue`	$5.80M	USD	Point-in-time
Cash and cash equivalents at end of period	`CashAndCashEquivalentsAtCarryingValue`	$56.90M	USD	Point-in-time
Cash and cash equivalents at end of period	`CashAndCashEquivalentsAtCarryingValue`	$8.20M	USD	Point-in-time
Interest, net of capitalized interest	`InterestPaidNet`	$212.60M	USD	Annual
Interest, net of capitalized interest	`InterestPaidNet`	$184.80M	USD	Annual
Interest, net of capitalized interest	`InterestPaidNet`	$192.40M	USD	Annual
Income taxes, net	`IncomeTaxesPaidNet`	$9.80M	USD	Annual
Income taxes, net	`IncomeTaxesPaidNet`	$11.30M	USD	Annual
Income taxes, net	`IncomeTaxesPaidNet`	-	USD	Annual
Accrued capital expenditures	`CapitalExpendituresIncurredButNotYetPaid`	$148.30M	USD	Annual
Accrued capital expenditures	`CapitalExpendituresIncurredButNotYetPaid`	$196.50M	USD	Annual
Accrued capital expenditures	`CapitalExpendituresIncurredButNotYetPaid`	$154.40M	USD	Annual

Stockholders Equity 41 line items

Line Item	Tag	Value	Unit	Period
Common stock dividends (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$1.26	USD	Annual
Common stock dividends (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$1.10	USD	Annual
Common stock dividends (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$1.18	USD	Annual
Beginning balance	`StockholdersEquity`	$3.86B	USD	Point-in-time
Beginning balance	`StockholdersEquity`	$3.72B	USD	Point-in-time
Beginning balance	`StockholdersEquity`	$3.44B	USD	Point-in-time
Beginning balance	`StockholdersEquity`	$4.18B	USD	Point-in-time
Beginning balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.06B	USD	Point-in-time
Beginning balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.38B	USD	Point-in-time
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$128.40M	USD	1 Quarter
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$457.30M	USD	Annual
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$96.50M	USD	1 Quarter
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$62.70M	USD	1 Quarter
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$378.20M	USD	Annual
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$93.80M	USD	1 Quarter
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$100.40M	USD	1 Quarter
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$371.50M	USD	Annual
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$168.80M	USD	1 Quarter
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$83.90M	USD	1 Quarter
Net income (loss) attributable to common shareowners	`NetIncomeLossAvailableToCommonStockholdersBasic`	$94.30M	USD	1 Quarter
Net income	`NetIncomeLoss`	$467.50M	USD	Annual
Net income	`NetIncomeLoss`	$381.70M	USD	Annual
Net income	`NetIncomeLoss`	$388.40M	USD	Annual
Common stock dividends	`DividendsCommonStock`	$247.30M	USD	Annual
Common stock dividends	`DividendsCommonStock`	$288.30M	USD	Annual
Common stock dividends	`DividendsCommonStock`	$266.50M	USD	Annual
Common stock issued, net	`ProceedsFromIssuanceOfCommonStock`	$149.60M	USD	Annual
Common stock issued, net	`ProceedsFromIssuanceOfCommonStock`	$151.20M	USD	Annual
Common stock issued, net	`ProceedsFromIssuanceOfCommonStock`	$26.60M	USD	Annual
Other	`StockholdersEquityOther`	$-3.10M	USD	Annual
Other	`StockholdersEquityOther`	$-1.70M	USD	Annual
Other	`StockholdersEquityOther`	$-6.30M	USD	Annual
Other comprehensive income (loss), net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$-100.00K	USD	Annual
Other comprehensive income (loss), net of tax	`OtherComprehensiveIncomeLossNetOfTax`	-	USD	Annual
Other comprehensive income (loss), net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$200.00K	USD	Annual
Ending balance	`StockholdersEquity`	$3.86B	USD	Point-in-time
Ending balance	`StockholdersEquity`	$3.72B	USD	Point-in-time
Ending balance	`StockholdersEquity`	$3.44B	USD	Point-in-time
Ending balance	`StockholdersEquity`	$4.18B	USD	Point-in-time
Ending balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.06B	USD	Point-in-time
Ending balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.38B	USD	Point-in-time

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