$LNT
ALLIANT ENERGY CORP Stock $lnt

$lnt Overview Financials Valuation SEC Filings Company Website

2017 Form 10-K Financial Statement

#000035254118000019 Filed on February 23, 2018

Income Statement

Concept	2017	2016 Q4	2016 Q3
Revenue	$3.382B	$797.0M	$924.6M
YoY Change	1.87%	7.69%	2.86%
Cost Of Revenue	$480.9M	$62.00M	$12.50M
YoY Change	147.5%	17.42%	-8.09%
Gross Profit	$2.901B	$735.0M	$912.1M
YoY Change	-7.18%	6.94%	3.03%
Gross Profit Margin	85.78%	92.22%	98.65%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$461.8M	$102.9M	$104.1M
YoY Change	12.2%	1.48%	4.83%
% of Gross Profit	15.92%	14.0%	11.41%
Operating Expenses	$2.500B	$618.0M	$663.1M
YoY Change	0.58%	1.63%	2.11%
Operating Profit	$671.2M	$99.90M	$162.6M
YoY Change	21.13%	26.14%	-31.07%
Interest Expense	$215.6M	-$22.40M	$48.80M
YoY Change	9.89%	-26.8%	5.17%
% of Operating Profit	32.12%	-22.42%	30.01%
Other Income/Expense, Net	-$138.4M	-$16.90M	-$23.70M
YoY Change	25.02%		-7.06%
Pretax Income	$532.8M	$77.70M	$138.9M
YoY Change	20.16%	59.88%	-33.98%
Income Tax	$66.70M	$12.20M	$7.500M
% Of Pretax Income	12.52%	15.7%	5.4%
Net Earnings	$467.5M	$65.20M	$131.0M
YoY Change	22.48%	78.14%	-28.22%
Net Earnings / Revenue	13.82%	8.18%	14.17%
Basic Earnings Per Share	$1.99
Diluted Earnings Per Share	$1.99	$0.28	$0.57
COMMON SHARES
Basic Shares Outstanding	229.7M shares		227.5M shares
Diluted Shares Outstanding	229.7M shares

Balance Sheet

Concept	2017	2016 Q4	2016 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$28.00M	$8.000M	$85.00M
YoY Change	250.0%	33.33%	-38.85%
Cash & Equivalents	$28.00M	$8.200M	$84.70M
Short-Term Investments
Other Short-Term Assets	$257.0M	$95.50M	$98.90M
YoY Change	5.33%	19.82%	-54.51%
Inventory	$222.0M	$222.0M	$220.0M
Prepaid Expenses
Receivables	$91.00M	$493.3M	$491.5M
Other Receivables	$307.0M	$0.00	$0.00
Total Short-Term Assets	$905.0M	$877.1M	$958.1M
YoY Change	3.19%	6.08%	-11.92%
LONG-TERM ASSETS
Property, Plant & Equipment	$11.24B	$10.28B	$9.920B
YoY Change	9.29%	7.98%	5.91%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$396.0M	$326.0M	$330.0M
YoY Change	17.16%	7.63%	-6.52%
Other Assets	$1.652B	$22.60M	$9.400M
YoY Change	-12.13%	54.79%	-73.67%
Total Long-Term Assets	$13.28B	$1.880B	$1.821B
YoY Change	6.29%	4.27%	-84.12%
TOTAL ASSETS
Total Short-Term Assets	$905.0M	$877.1M	$958.1M
Total Long-Term Assets	$13.28B	$1.880B	$1.821B
Total Assets	$14.19B	$13.37B	$13.03B
YoY Change	6.09%	7.03%	3.75%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$477.0M	$445.3M	$365.1M
YoY Change	7.19%	10.66%	-16.7%
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$415.0M	$244.0M	$238.0M
YoY Change	70.08%	52.5%	118.35%
Long-Term Debt Due	$856.0M	$4.600M	$314.0M
YoY Change	17020.0%	-98.53%	10366.67%
Total Short-Term Liabilities	$2.149B	$1.162B	$1.370B
YoY Change	84.94%	-14.51%	38.24%
LONG-TERM LIABILITIES
Long-Term Debt	$4.011B	$4.316B	$3.817B
YoY Change	-7.07%	22.53%	-1.01%
Other Long-Term Liabilities	$2.168B	$279.3M	$300.2M
YoY Change	71.52%	-8.73%	-9.85%
Total Long-Term Liabilities	$6.179B	$4.595B	$4.117B
YoY Change	10.73%	20.03%	-1.71%
TOTAL LIABILITIES
Total Short-Term Liabilities	$2.149B	$1.162B	$1.370B
Total Long-Term Liabilities	$6.179B	$4.595B	$4.117B
Total Liabilities	$9.806B	$5.757B	$5.487B
YoY Change	5.3%	10.98%	5.93%
SHAREHOLDERS EQUITY
Retained Earnings		$2.177B	$2.181B
YoY Change		5.22%	4.01%
Common Stock		$1.695B	$1.688B
YoY Change		1.88%	1.88%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$4.382B	$4.062B	$3.859B
YoY Change
Total Liabilities & Shareholders Equity	$14.19B	$13.37B	$13.03B
YoY Change	6.09%	7.03%	3.75%

Cashflow Statement

Concept	2017	2016 Q4	2016 Q3
OPERATING ACTIVITIES
Net Income	$467.5M	$65.20M	$131.0M
YoY Change	22.48%	78.14%	-28.22%
Depreciation, Depletion And Amortization	$461.8M	$102.9M	$104.1M
YoY Change	12.2%	1.48%	4.83%
Cash From Operating Activities	$521.6M	-$261.2M	$144.0M
YoY Change	32.79%	-248.49%	-19.1%
INVESTING ACTIVITIES
Capital Expenditures	$1.467B	-$387.6M	-$252.6M
YoY Change	22.57%	36.14%	4.08%
Acquisitions
YoY Change
Other Investing Activities	$28.30M	$439.2M	-$18.40M
YoY Change	-388.78%	-2142.79%	-118.4%
Cash From Investing Activities	-$1.033B	$51.60M	-$271.0M
YoY Change	43.49%	-116.85%	89.91%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$149.6M
YoY Change	462.41%
Debt Paid & Issued, Net	$4.600M
YoY Change	-98.53%
Cash From Financing Activities	$532.6M	132.6M	205.2M
YoY Change	61.74%	-4377.42%	317.92%
NET CHANGE
Cash From Operating Activities	$521.6M	-261.2M	144.0M
Cash From Investing Activities	-$1.033B	51.60M	-271.0M
Cash From Financing Activities	$532.6M	132.6M	205.2M
Net Change In Cash	$20.80M	-77.00M	78.20M
YoY Change	994.74%	-42.28%	-7.35%
FREE CASH FLOW
Cash From Operating Activities	$521.6M	-$261.2M	$144.0M
Capital Expenditures	$1.467B	-$387.6M	-$252.6M
Free Cash Flow	-$945.3M	$126.4M	$396.6M
YoY Change	17.57%	-72.56%	-5.73%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2017	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2017	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2017	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2017
CY2017	dei	Document Period End Date DocumentPeriodEndDate	2017-12-31
CY2017	dei	Document Type DocumentType	10-K
CY2017	dei	Entity Central Index Key EntityCentralIndexKey	0000352541
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CY2017	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2017	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2017Q2	dei	Entity Public Float EntityPublicFloat	9300000000	USD
CY2017	dei	Entity Registrant Name EntityRegistrantName	ALLIANT ENERGY CORP
CY2017	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2017	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
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CY2017Q4	lnt	Accumulated Depreciation On Property Plant And Equipment Non Regulated Business Line1 AccumulatedDepreciationOnPropertyPlantAndEquipmentNonRegulatedBusinessLine1	50500000	USD
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CY2017	lnt	Maximum Remaining Estimated Cost Incurred For Investigation Remediation And Monitoring MaximumRemainingEstimatedCostIncurredForInvestigationRemediationAndMonitoring	30000000	USD
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CY2016Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	227673654	shares
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CY2016Q4	us-gaap	Common Stock Value CommonStockValue	2300000	USD
CY2017Q4	us-gaap	Common Stock Value CommonStockValue	2300000	USD
CY2015	us-gaap	Cost Of Domestic Regulated Gas Revenue CostOfDomesticRegulatedGasRevenue	219100000	USD
CY2016	us-gaap	Cost Of Domestic Regulated Gas Revenue CostOfDomesticRegulatedGasRevenue	194300000	USD
CY2017	us-gaap	Cost Of Domestic Regulated Gas Revenue CostOfDomesticRegulatedGasRevenue	211400000	USD
CY2015	us-gaap	Cost Of Transmission CostOfTransmission	485300000	USD
CY2016	us-gaap	Cost Of Transmission CostOfTransmission	527900000	USD
CY2017	us-gaap	Cost Of Transmission CostOfTransmission	480900000	USD
CY2015	us-gaap	Costs And Expenses CostsAndExpenses	2676600000	USD
CY2016	us-gaap	Costs And Expenses CostsAndExpenses	2783000000	USD
CY2017	us-gaap	Costs And Expenses CostsAndExpenses	2728800000	USD
CY2016Q4	us-gaap	Costs In Excess Of Billings On Uncompleted Contracts Or Programs Expected To Be Collected Within One Year CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear	90200000	USD
CY2017Q4	us-gaap	Costs In Excess Of Billings On Uncompleted Contracts Or Programs Expected To Be Collected Within One Year CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear	85100000	USD
CY2015	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	2000000	USD
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	1800000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-41000000	USD
CY2015	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3200000	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
CY2016Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	4357100000	USD
CY2017Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	4902500000	USD
CY2016Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	13500000	USD
CY2017Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	10800000	USD
CY2016Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	3834200000	USD
CY2017Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	3646000000	USD
CY2015	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	120800000	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
CY2016Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	23400000	USD
CY2017Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	25400000	USD
CY2016Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	3167200000	USD
CY2017Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	2015000000	USD
CY2015	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	114200000	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
CY2015	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	27900000	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
CY2016Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	597200000	USD
CY2016Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.43
CY2017Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	545600000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	597000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	536600000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	173300000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	174400000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	32900000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	41300000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	87900000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	61800000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	268400000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	260700000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	200000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	9000000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	2570200000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1478400000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	2570200000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	1478400000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	95100000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	75900000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	2919000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1852700000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	478300000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	90400000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	110100000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	94600000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	94100000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	92300000	USD
CY2015	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	24900000	USD
CY2016	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	23600000	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	24800000	USD
CY2015	us-gaap	Depreciation And Amortization DepreciationAndAmortization	401300000	USD
CY2016	us-gaap	Depreciation And Amortization DepreciationAndAmortization	411600000	USD
CY2017	us-gaap	Depreciation And Amortization DepreciationAndAmortization	461800000	USD
CY2015	us-gaap	Dividends Common Stock DividendsCommonStock	247300000	USD
CY2016	us-gaap	Dividends Common Stock DividendsCommonStock	266500000	USD
CY2017	us-gaap	Dividends Common Stock DividendsCommonStock	288300000	USD
CY2015	us-gaap	Dividends Preferred Stock DividendsPreferredStock	10200000	USD
CY2016	us-gaap	Dividends Preferred Stock DividendsPreferredStock	10200000	USD
CY2017	us-gaap	Dividends Preferred Stock DividendsPreferredStock	10200000	USD
CY2015	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	1.68
CY2016	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	1.64
CY2017	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	1.99
CY2016Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.43
CY2016Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.37
CY2016Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.57
CY2016Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.28
CY2017Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.44
CY2017Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.41
CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.73
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.41
CY2015	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.153
CY2016	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.134
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.125
CY2015	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350
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
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0.072
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
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.003
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.013
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.024
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0.000
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
CY2015	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.052
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
CY2015	us-gaap	Electric Domestic Regulated Revenue ElectricDomesticRegulatedRevenue	2770500000	USD
CY2016	us-gaap	Electric Domestic Regulated Revenue ElectricDomesticRegulatedRevenue	2875500000	USD
CY2017	us-gaap	Electric Domestic Regulated Revenue ElectricDomesticRegulatedRevenue	2894700000	USD
CY2015	us-gaap	Electric Production Expense ElectricProductionExpense	837700000	USD
CY2016	us-gaap	Electric Production Expense ElectricProductionExpense	854000000	USD
CY2017	us-gaap	Electric Production Expense ElectricProductionExpense	818100000	USD
CY2017Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	5600000	USD
CY2015	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4400000	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
CY2016Q4	us-gaap	Energy Related Inventory Gas Stored Underground EnergyRelatedInventoryGasStoredUnderground	37600000	USD
CY2017Q4	us-gaap	Energy Related Inventory Gas Stored Underground EnergyRelatedInventoryGasStoredUnderground	44500000	USD
CY2016Q4	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	98100000	USD
CY2017Q4	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	72300000	USD
CY2015	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	30600000	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
CY2016Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Assets EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	82000000	USD
CY2017Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Assets EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	104000000	USD
CY2016Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	498000000	USD
CY2017Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	770000000	USD
CY2015	us-gaap	Equity Method Investment Summarized Financial Information Gross Profit Loss EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss	299000000	USD
CY2016	us-gaap	Equity Method Investment Summarized Financial Information Gross Profit Loss EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss	331000000	USD
CY2017	us-gaap	Equity Method Investment Summarized Financial Information Gross Profit Loss EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss	374000000	USD
CY2016Q4	us-gaap	Equity Method Investment Summarized Financial Information Minority Interest EquityMethodInvestmentSummarizedFinancialInformationMinorityInterest	0	USD
CY2017Q4	us-gaap	Equity Method Investment Summarized Financial Information Minority Interest EquityMethodInvestmentSummarizedFinancialInformationMinorityInterest	255000000	USD
CY2015	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	186000000	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
CY2016Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Assets EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets	4340000000	USD
CY2017Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Assets EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets	5041000000	USD
CY2016Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Liabilities EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities	2144000000	USD
CY2017Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Liabilities EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities	2038000000	USD
CY2015	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	624000000	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
CY2015Q4	us-gaap	Equity Method Investments EquityMethodInvestments	302900000	USD
CY2016Q4	us-gaap	Equity Method Investments EquityMethodInvestments	326000000	USD
CY2017Q4	us-gaap	Equity Method Investments EquityMethodInvestments	381400000	USD
CY2015	us-gaap	Gas Domestic Regulated Revenue GasDomesticRegulatedRevenue	381200000	USD
CY2016	us-gaap	Gas Domestic Regulated Revenue GasDomesticRegulatedRevenue	355400000	USD
CY2017	us-gaap	Gas Domestic Regulated Revenue GasDomesticRegulatedRevenue	400900000	USD
CY2015	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	0	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
CY2015	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	380700000	USD
CY2016Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	97600000	USD
CY2016Q2	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	84400000	USD
CY2016Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	128800000	USD
CY2016Q4	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	63000000	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
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	461300000	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
CY2015	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	390900000	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
CY2015	us-gaap	Income Loss From Continuing Operations Per Basic And Diluted Share IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	1.69
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
CY2016Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.37
CY2016Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.57
CY2016Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.28
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
CY2015	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-2500000	USD
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
CY2015	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-2500000	USD
CY2016Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-1100000	USD
CY2016Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-500000	USD
CY2016Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-400000	USD
CY2016Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-300000	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
CY2015	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic And Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	-0.01
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
CY2016Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2016Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2016Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2016Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	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
CY2015	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	33800000	USD
CY2016	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	39600000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	44800000	USD
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	70400000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	59400000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	66700000	USD
CY2015	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	0	USD
CY2016	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	9800000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	11300000	USD
CY2015	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-36800000	USD
CY2016	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	121400000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-29600000	USD
CY2015	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	24400000	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
CY2015	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-94600000	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
CY2015	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-24700000	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
CY2015	us-gaap	Increase Decrease In Other Receivables IncreaseDecreaseInOtherReceivables	17000000	USD
CY2016	us-gaap	Increase Decrease In Other Receivables IncreaseDecreaseInOtherReceivables	-16000000	USD
CY2017	us-gaap	Increase Decrease In Other Receivables IncreaseDecreaseInOtherReceivables	9000000	USD
CY2015	us-gaap	Increase Decrease In Other Regulatory Assets IncreaseDecreaseInOtherRegulatoryAssets	104500000	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
CY2015	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	-67800000	USD
CY2016	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	-63000000	USD
CY2017	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	-83800000	USD
CY2015	us-gaap	Interest Expense InterestExpense	187100000	USD
CY2016	us-gaap	Interest Expense InterestExpense	196200000	USD
CY2017	us-gaap	Interest Expense InterestExpense	215600000	USD
CY2015	us-gaap	Interest Paid Net InterestPaidNet	184800000	USD
CY2016	us-gaap	Interest Paid Net InterestPaidNet	192400000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	212600000	USD
CY2016Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	86600000	USD
CY2017Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	105600000	USD
CY2015	us-gaap	Investment Tax Credit InvestmentTaxCredit	1400000	USD
CY2016	us-gaap	Investment Tax Credit InvestmentTaxCredit	1300000	USD
CY2017	us-gaap	Investment Tax Credit InvestmentTaxCredit	1100000	USD
CY2017Q4	us-gaap	Jointly Owned Utility Plant Gross Ownership Amount Of Plant In Service JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService	1692000000	USD
CY2017Q4	us-gaap	Jointly Owned Utility Plant Ownership Amount Of Construction Work In Progress JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress	89000000	USD
CY2017Q4	us-gaap	Jointly Owned Utility Plant Ownership Amount Of Plant Accumulated Depreciation JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation	582700000	USD
CY2016Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	13373800000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	14187800000	USD
CY2016Q4	us-gaap	Liabilities Current LiabilitiesCurrent	1162000000	USD
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	2149000000	USD
CY2017Q4	us-gaap	Line Of Credit Facility Current Borrowing Capacity LineOfCreditFacilityCurrentBorrowingCapacity	1000000000	USD
CY2016Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	755900000	USD
CY2017Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	679800000	USD
CY2016Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	4600000	USD
CY2017Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	855700000	USD
CY2016Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	4799000000	USD
CY2017Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	5447500000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	856000000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	333000000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	8000000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	357000000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	256000000	USD
CY2016Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	4315600000	USD
CY2017Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	4010600000	USD
CY2016Q4	us-gaap	Long Term Investments LongTermInvestments	337600000	USD
CY2017Q4	us-gaap	Long Term Investments LongTermInvestments	396100000	USD
CY2017	us-gaap	Long Term Purchase Commitment Amount LongTermPurchaseCommitmentAmount	2410000000	USD
CY2016Q4	us-gaap	Minority Interest Amount Represented By Preferred Stock MinorityInterestAmountRepresentedByPreferredStock	200000000	USD
CY2017Q4	us-gaap	Minority Interest Amount Represented By Preferred Stock MinorityInterestAmountRepresentedByPreferredStock	200000000	USD
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-3100000	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
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-919200000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1186500000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1496300000	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	871200000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	859600000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	983400000	USD
CY2015	us-gaap	Net Income Loss NetIncomeLoss	388400000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	381700000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	467500000	USD
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	378200000	USD
CY2016Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	96500000	USD
CY2016Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	83900000	USD
CY2016Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	128400000	USD
CY2016Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	62700000	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
CY2015	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-115700000	USD
CY2016	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-93600000	USD
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-120600000	USD
CY2015	us-gaap	Operating Income Loss OperatingIncomeLoss	577000000	USD
CY2016Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	145900000	USD
CY2016Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	128600000	USD
CY2016Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	162600000	USD
CY2016Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	99900000	USD
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	537000000	USD
CY2017Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	142900000	USD
CY2017Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	149300000	USD
CY2017Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	231500000	USD
CY2017Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	129700000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	653400000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	29000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	6000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	1000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	2000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	2000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	5000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	13000000	USD
CY2016Q4	us-gaap	Other Assets Current OtherAssetsCurrent	95500000	USD
CY2017Q4	us-gaap	Other Assets Current OtherAssetsCurrent	87700000	USD
CY2016Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	22600000	USD
CY2017Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	69700000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	200000	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
CY2015	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	629500000	USD
CY2016	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	606500000	USD
CY2017	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	651000000	USD
CY2016Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	281800000	USD
CY2017Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	260800000	USD
CY2016Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	279300000	USD
CY2017Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	306400000	USD
CY2016Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	20000000	USD
CY2017Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	121900000	USD
CY2015	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-15700000	USD
CY2016	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-800000	USD
CY2017	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-6700000	USD
CY2015	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	700000	USD
CY2016	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	500000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	500000	USD
CY2015	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	12400000	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
CY2016Q4	us-gaap	Other Receivables OtherReceivables	89000000	USD
CY2017Q4	us-gaap	Other Receivables OtherReceivables	84300000	USD
CY2015	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	57900000	USD
CY2016	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	48600000	USD
CY2017	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	47500000	USD
CY2016Q4	us-gaap	Other Short Term Borrowings OtherShortTermBorrowings	0	USD
CY2017Q4	us-gaap	Other Short Term Borrowings OtherShortTermBorrowings	95000000	USD
CY2016	us-gaap	Payments For Proceeds From Life Insurance Policies PaymentsForProceedsFromLifeInsurancePolicies	-31000000	USD
CY2015	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	24800000	USD
CY2016	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-10300000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	29400000	USD
CY2015	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	247300000	USD
CY2016	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	266500000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	288300000	USD
CY2015	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1034300000	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
CY2016Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	489900000	USD
CY2017Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	504000000	USD
CY2015	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	151200000	USD
CY2016	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	26600000	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	149600000	USD
CY2015	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	250700000	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
CY2015	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	6800000	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
CY2015	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	18500000	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
CY2015	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	139900000	USD
CY2016	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	0	USD
CY2017	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	0	USD
CY2016Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	10279200000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	11234500000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	469300000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	436600000	USD
CY2015	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	36900000	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
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	4135700000	USD
CY2017Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	4283100000	USD
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	1226800000	USD
CY2017Q4	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	962200000	USD
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	9809900000	USD
CY2017Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	10797900000	USD
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	18400000	USD
CY2017Q4	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	6000000	USD
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Present Value Of Regulated Asset For Plant Abandonment PublicUtilitiesPropertyPlantAndEquipmentPresentValueOfRegulatedAssetForPlantAbandonment	108300000	USD
CY2017Q4	us-gaap	Public Utilities Property Plant And Equipment Present Value Of Regulated Asset For Plant Abandonment PublicUtilitiesPropertyPlantAndEquipmentPresentValueOfRegulatedAssetForPlantAbandonment	93000000	USD
CY2016Q4	us-gaap	Regulatory Assets RegulatoryAssets	1915100000	USD
CY2017Q4	us-gaap	Regulatory Assets RegulatoryAssets	1666700000	USD
CY2016Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	57800000	USD
CY2017Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	84300000	USD
CY2016Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1857300000	USD
CY2017Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1582400000	USD
CY2016Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	681000000	USD
CY2017Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	1497200000	USD
CY2016Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	186200000	USD
CY2017Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	140000000	USD
CY2016Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	494800000	USD
CY2017Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	1357200000	USD
CY2015	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	183000000	USD
CY2016	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	313400000	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	4600000	USD
CY2016Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2177000000	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2346000000	USD
CY2015	us-gaap	Revenues Revenues	3253600000	USD
CY2016Q1	us-gaap	Revenues Revenues	843800000	USD
CY2016Q2	us-gaap	Revenues Revenues	754600000	USD
CY2016Q3	us-gaap	Revenues Revenues	924600000	USD
CY2016Q4	us-gaap	Revenues Revenues	797000000	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
CY2016Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.009
CY2017Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.020
CY2016	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	179000000	USD
CY2017	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	294300000	USD
CY2016	us-gaap	Shortterm Debt Maximum Amount Outstanding During Period ShorttermDebtMaximumAmountOutstandingDuringPeriod	251800000	USD
CY2017	us-gaap	Shortterm Debt Maximum Amount Outstanding During Period ShorttermDebtMaximumAmountOutstandingDuringPeriod	424400000	USD
CY2015	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	112756	shares
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
CY2014Q4	us-gaap	Stockholders Equity StockholdersEquity	3438700000	USD
CY2015Q4	us-gaap	Stockholders Equity StockholdersEquity	3724100000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	3862000000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	4182200000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4062000000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4382200000	USD
CY2015	us-gaap	Stockholders Equity Other StockholdersEquityOther	-3100000	USD
CY2016	us-gaap	Stockholders Equity Other StockholdersEquityOther	-6300000	USD
CY2017	us-gaap	Stockholders Equity Other StockholdersEquityOther	-1700000	USD
CY2015	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	103700000	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
CY2015	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	44000000	USD
CY2016	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	40500000	USD
CY2017	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	39100000	USD
CY2015	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	225400000	shares
CY2016	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	227100000	shares
CY2017	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	229700000	shares
CY2017	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 reclassifications resulting from modifications to segment reporting as discussed in </font><a style="font-family:inherit;font-size:10pt;" href="#s79FF8E22A14E55108A409FD24677DEE0"><font style="font-family:inherit;font-size:10pt;">Note 17</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>
CY2017	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

Name	View Source	Status
0000352541-18-000019-index-headers.html	Edgar Link	pending
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$LNT
ALLIANT ENERGY CORP Stock $lnt

2017 Form 10-K Financial Statement

#000035254118000019 Filed on February 23, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$LNT ALLIANT ENERGY CORP Stock $lnt

2017 Form 10-K Financial Statement

#000035254118000019 Filed on February 23, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$LNT
ALLIANT ENERGY CORP Stock $lnt