$SR
Spire Inc Stock $sr

$sr Overview Financials Valuation SEC Filings Company Website

2018 Q3 Form 10-K Financial Statement

#000112695618000065 Filed on November 15, 2018

Income Statement

Concept	2018 Q3	2018	2017 Q3
Revenue	$239.2M	$1.965B	$258.7M
YoY Change	-7.54%	12.89%	-7.38%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$45.50M	$168.4M	$39.70M
YoY Change	14.61%	9.28%	11.83%
% of Gross Profit
Operating Expenses	$258.1M	$1.671B	$256.8M
YoY Change	0.51%	19.37%	-10.52%
Operating Profit	-$18.90M	$294.1M	$1.900M
YoY Change	-1094.74%	-13.73%	-124.68%
Interest Expense	-$24.40M	$98.40M	-$22.90M
YoY Change	6.55%	10.44%	17.44%
% of Operating Profit		33.46%	-1205.26%
Other Income/Expense, Net	-$600.0K	-$8.000M	$1.000M
YoY Change	-160.0%	-36.51%	-79.17%
Pretax Income	-$43.90M	$187.7M	-$20.00M
YoY Change	119.5%	-21.53%	-10.71%
Income Tax	-$11.90M	-$26.50M	-$6.700M
% Of Pretax Income		-14.12%
Net Earnings	-$25.90M	$214.2M	-$13.30M
YoY Change	94.74%	32.55%	-6.34%
Net Earnings / Revenue	-10.83%	10.9%	-5.14%
Basic Earnings Per Share	-$0.51	$4.35	-$0.28
Diluted Earnings Per Share	-$0.51	$4.33	-$0.28
COMMON SHARES
Basic Shares Outstanding	50.67M shares	49.10M	48.26M shares
Diluted Shares Outstanding		49.30M

Balance Sheet

Concept	2018 Q3	2018	2017 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$4.400M	$4.400M	$7.400M
YoY Change	-40.54%	-40.54%	42.31%
Cash & Equivalents	$4.400M	$4.400M	$7.400M
Short-Term Investments
Other Short-Term Assets	$37.40M	$146.3M	$6.200M
YoY Change	503.23%	-33.2%	-95.29%
Inventory	$210.3M	$210.3M	$225.8M
Prepaid Expenses	$31.00M		$28.00M
Receivables	$296.8M	$296.8M	$271.4M
Other Receivables	$1.800M	$1.800M	$1.900M
Total Short-Term Assets	$659.6M	$659.6M	$725.5M
YoY Change	-9.08%	-9.08%	27.37%
LONG-TERM ASSETS
Property, Plant & Equipment	$174.5M	$4.145B	$52.00M
YoY Change	235.58%	11.51%	279.56%
Goodwill	$1.172B		$1.172B
YoY Change	0.0%		0.58%
Intangibles
YoY Change
Long-Term Investments	$68.70M	$68.70M	$64.20M
YoY Change	7.01%	7.01%	3.38%
Other Assets	$128.9M	$798.7M	$77.10M
YoY Change	67.19%	-8.01%	-40.19%
Total Long-Term Assets	$6.184B	$6.184B	$5.821B
YoY Change	6.23%	6.23%	5.94%
TOTAL ASSETS
Total Short-Term Assets	$659.6M	$659.6M	$725.5M
Total Long-Term Assets	$6.184B	$6.184B	$5.821B
Total Assets	$6.844B	$6.844B	$6.547B
YoY Change	4.54%	4.54%	7.95%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$290.1M	$290.1M	$257.1M
YoY Change	12.84%	12.84%	21.91%
Accrued Expenses	$54.90M	$54.90M	$53.30M
YoY Change	3.0%	3.0%	-2.38%
Deferred Revenue	$22.70M
YoY Change
Short-Term Debt	$553.6M	$553.6M	$477.3M
YoY Change	15.99%	15.99%	19.71%
Long-Term Debt Due	$175.5M	$175.5M	$100.0M
YoY Change	75.5%	75.5%	-60.0%
Total Short-Term Liabilities	$1.322B	$1.322B	$1.098B
YoY Change	20.38%	20.38%	-5.46%
LONG-TERM LIABILITIES
Long-Term Debt	$1.900B	$1.900B	$1.995B
YoY Change	-4.76%	-4.76%	9.57%
Other Long-Term Liabilities	$66.80M	$922.7M	$63.80M
YoY Change	4.7%	22.21%	-3.48%
Total Long-Term Liabilities	$1.967B	$2.823B	$2.059B
YoY Change	-4.46%	2.65%	9.12%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.322B	$1.322B	$1.098B
Total Long-Term Liabilities	$1.967B	$2.823B	$2.059B
Total Liabilities	$3.289B	$4.588B	$3.157B
YoY Change	4.18%	0.72%	3.56%
SHAREHOLDERS EQUITY
Retained Earnings	$715.6M		$614.2M
YoY Change	16.51%		11.49%
Common Stock	$50.70M		$48.30M
YoY Change	4.97%		5.92%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$2.255B	$2.255B	$1.991B
YoY Change
Total Liabilities & Shareholders Equity	$6.844B	$6.844B	$6.547B
YoY Change	4.54%	4.54%	7.95%

Cashflow Statement

Concept	2018 Q3	2018	2017 Q3
OPERATING ACTIVITIES
Net Income	-$25.90M	$214.2M	-$13.30M
YoY Change	94.74%	32.55%	-6.34%
Depreciation, Depletion And Amortization	$45.50M	$168.4M	$39.70M
YoY Change	14.61%	9.28%	11.83%
Cash From Operating Activities	-$54.70M	$456.6M	-$32.40M
YoY Change	68.83%	58.38%	13.29%
INVESTING ACTIVITIES
Capital Expenditures	-$165.1M	$499.4M	-$139.5M
YoY Change	18.35%	13.99%	42.35%
Acquisitions		$0.00
YoY Change		-100.0%
Other Investing Activities	$4.700M	$4.200M	-$300.0K
YoY Change	-1666.67%	-625.0%	-99.91%
Cash From Investing Activities	-$160.4M	-$531.7M	-$139.8M
YoY Change	14.74%	22.65%	-66.39%
FINANCING ACTIVITIES
Cash Dividend Paid		$108.7M
YoY Change		12.99%
Common Stock Issuance & Retirement, Net		$154.7M
YoY Change		5.31%
Debt Paid & Issued, Net		$105.0M
YoY Change		-73.34%
Cash From Financing Activities	229.6M	89.10M	171.3M
YoY Change	34.03%	-39.55%	-61.49%
NET CHANGE
Cash From Operating Activities	-54.70M	456.6M	-32.40M
Cash From Investing Activities	-160.4M	-531.7M	-139.8M
Cash From Financing Activities	229.6M	89.10M	171.3M
Net Change In Cash	14.50M	14.00M	-900.0K
YoY Change	-1711.11%	536.36%	-400.0%
FREE CASH FLOW
Cash From Operating Activities	-$54.70M	$456.6M	-$32.40M
Capital Expenditures	-$165.1M	$499.4M	-$139.5M
Free Cash Flow	$110.4M	-$42.80M	$107.1M
YoY Change	3.08%	-71.43%	54.32%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2018	dei	Document Type DocumentType	10-K
CY2018	dei	Entity Central Index Key EntityCentralIndexKey	0001126956
CY2018	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2018	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2016	lg	Add Acquisition Divestiture And Restructuring Activities AddAcquisitionDivestitureAndRestructuringActivities	9200000	USD
CY2018Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	50676192	shares
CY2018	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2018	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2018	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2018Q1	dei	Entity Public Float EntityPublicFloat	3391208752	USD
CY2018	dei	Entity Registrant Name EntityRegistrantName	SPIRE INC
CY2018	dei	Entity Shell Company EntityShellCompany	false
CY2018	dei	Entity Small Business EntitySmallBusiness	false
CY2018	dei	Amendment Flag AmendmentFlag	false
CY2018	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--09-30
CY2018	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2018	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2018
CY2018	dei	Document Period End Date DocumentPeriodEndDate	2018-09-30
CY2017	lg	Add Acquisition Divestiture And Restructuring Activities AddAcquisitionDivestitureAndRestructuringActivities	4000000	USD
CY2018	lg	Add Acquisition Divestiture And Restructuring Activities AddAcquisitionDivestitureAndRestructuringActivities	13600000	USD
CY2018	lg	Anticipated Contributions To Pension Plans Non Qualified Trusts AnticipatedContributionsToPensionPlansNonQualifiedTrusts	500000	USD
CY2018	lg	Anticipated Contributions To Pension Plans Qualified Trusts AnticipatedContributionsToPensionPlansQualifiedTrusts	27100000	USD
CY2017	lg	Asset Retirement Obligation Business Combinationsand Acquisitions Retirement Obligation AssetRetirementObligationBusinessCombinationsandAcquisitionsRetirementObligation	0	USD
CY2018	lg	Asset Retirement Obligation Business Combinationsand Acquisitions Retirement Obligation AssetRetirementObligationBusinessCombinationsandAcquisitionsRetirementObligation	600000	USD
CY2017Q3	lg	Company Share CompanyShare	0.15
CY2016Q3	lg	Customer Share CustomerShare	1
CY2017Q3	lg	Customer Share CustomerShare	0.85
CY2018Q3	lg	Customer Share CustomerShare	0.75
CY2017Q3	lg	Debt Instrument Principal Outstanding Excluding Current Portion DebtInstrumentPrincipalOutstandingExcludingCurrentPortion	2012000000	USD
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CY2017Q3	lg	Deferred Tax Assets Unamortized Investment Tax Credits DeferredTaxAssetsUnamortizedInvestmentTaxCredits	0	USD
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CY2018	lg	Difference Between Replacement Cost Of Gas Storage And Inventory Basis Amount DifferenceBetweenReplacementCostOfGasStorageAndInventoryBasisAmount	14500000	USD
CY2016	lg	Effective Income Tax Rate Reconciliation Amortization Of Excess Deferred Taxes Percent EffectiveIncomeTaxRateReconciliationAmortizationOfExcessDeferredTaxesPercent	0.000
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CY2016	lg	Lower Of Cost Or Market Inventory Adjustments Net Of Tax LowerOfCostOrMarketInventoryAdjustmentsNetOfTax	200000	USD
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CY2016	lg	Non Regulated Gas Marketingand Other Operating Expenses NonRegulatedGasMarketingandOtherOperatingExpenses	123200000	USD
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CY2018Q3	lg	Notional Amountof Non Exchange Traded Natural Gas Commodity Contracts To Be Settledin Year Three NotionalAmountofNonExchangeTradedNaturalGasCommodityContractsToBeSettledinYearThree	30500000	MMBTU
CY2018Q3	lg	Notional Amountof Non Exchange Traded Natural Gas Commodity Contracts To Be Settledin Year Two NotionalAmountofNonExchangeTradedNaturalGasCommodityContractsToBeSettledinYearTwo	43100000	MMBTU
CY2018Q3	lg	Number Of Counterparties For Which Credit Risk Is Disclosed NumberOfCounterpartiesForWhichCreditRiskIsDisclosed	5	counterparty
CY2014Q2	lg	Number Of Shares Authorized For Issuance Under Dividend Reinvestment And Stock Purchase Program In Shares NumberOfSharesAuthorizedForIssuanceUnderDividendReinvestmentAndStockPurchaseProgramInShares	250000	shares
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CY2018Q3	lg	Number Of Shares Remaining And Available For Issuance Under Dividend Reinvestment And Stock Purchase Program In Shares NumberOfSharesRemainingAndAvailableForIssuanceUnderDividendReinvestmentAndStockPurchaseProgramInShares	221107	shares
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CY2018	lg	Regulatory Order Excess Deferred Income Tax Returned To Customers RegulatoryOrderExcessDeferredIncomeTaxReturnedToCustomers	3500000	USD
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CY2018	lg	Tax Cutsand Jobs Actof2017 Incomplete Accounting Changein Tax Rate Regulatory Liability Provisional Income Tax Expense Benefit TaxCutsandJobsActof2017IncompleteAccountingChangeinTaxRateRegulatoryLiabilityProvisionalIncomeTaxExpenseBenefit	167400000	USD
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CY2017Q3	lg	Unamortized Purchased Gas Adjustments UnamortizedPurchasedGasAdjustments	1000000	USD
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CY2018	us-gaap	Allowance For Doubtful Accounts Receivable Period Increase Decrease AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease	-10500000	USD
CY2016	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	6500000	USD
CY2017	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	10600000	USD
CY2018	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	14600000	USD
CY2017Q2	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2500000	shares
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2875000	shares
CY2016Q3	us-gaap	Asset Retirement Obligation AssetRetirementObligation	206400000	USD
CY2017Q3	us-gaap	Asset Retirement Obligation AssetRetirementObligation	296600000	USD
CY2018Q3	us-gaap	Asset Retirement Obligation AssetRetirementObligation	321100000	USD
CY2017	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	9100000	USD
CY2018	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	12700000	USD
CY2017	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	5500000	USD
CY2018	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	5500000	USD
CY2017	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	4600000	USD
CY2018	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	11200000	USD
CY2017	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	80200000	USD
CY2018	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	16900000	USD
CY2017Q3	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	296600000	USD
CY2018Q3	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	321100000	USD
CY2016Q3	us-gaap	Assets Assets	6064400000	USD
CY2017Q3	us-gaap	Assets Assets	6546700000	USD
CY2018Q3	us-gaap	Assets Assets	6843600000	USD
CY2017Q3	us-gaap	Assets Current AssetsCurrent	725500000	USD
CY2018Q3	us-gaap	Assets Current AssetsCurrent	659600000	USD
CY2016	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	3.48
CY2017	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	3.44
CY2018	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	4.35
CY2016	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	3.46
CY2017	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	3.43
CY2018	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	4.33
CY2016	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	153900000	USD
CY2017	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	161600000	USD
CY2018	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	214200000	USD
CY2016	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	1632400000	USD
CY2017	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	1740700000	USD
CY2018	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	1965000000	USD
CY2016	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	30400000	USD
CY2017	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	41000000	USD
CY2018	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	62100000	USD
CY2017Q3	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	3986300000	USD
CY2018Q3	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	4163400000	USD
CY2018	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	2000000	USD
CY2017Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	7400000	USD
CY2018Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	4400000	USD
CY2015Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	13800000	USD
CY2016Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	5200000	USD
CY2017Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	7400000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	21400000	USD
CY2016	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-8600000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	2200000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	14000000	USD
CY2017Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2018Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2016	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.96
CY2017	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.10
CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.25
CY2017Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2018Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2017Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	70000000	shares
CY2018Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	70000000	shares
CY2017Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	48263243	shares
CY2018Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	50671903	shares
CY2017Q3	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	48300000	USD
CY2018Q3	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	50700000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	142000000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	169000000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	216700000	USD
CY2016	us-gaap	Costs And Expenses CostsAndExpenses	1255000000	USD
CY2017	us-gaap	Costs And Expenses CostsAndExpenses	1419000000	USD
CY2018	us-gaap	Costs And Expenses CostsAndExpenses	1685300000	USD
CY2018Q3	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	7700000	USD
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	100000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	100000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2016	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	600000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	500000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2200000	USD
CY2017Q3	us-gaap	Customer Deposits Current CustomerDepositsCurrent	34900000	USD
CY2018Q3	us-gaap	Customer Deposits Current CustomerDepositsCurrent	35500000	USD
CY2018Q3	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	2092000000	USD
CY2018	us-gaap	Debt Instrument Interest Rate During Period DebtInstrumentInterestRateDuringPeriod	0.020
CY2017Q3	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	1800000	USD
CY2018Q3	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	2400000	USD
CY2017Q3	us-gaap	Deferred Costs DeferredCosts	868200000	USD
CY2018Q3	us-gaap	Deferred Costs DeferredCosts	798700000	USD
CY2016	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	62000000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	67700000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-22700000	USD
CY2017Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	992700000	USD
CY2018Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	748600000	USD
CY2017Q3	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	707500000	USD
CY2018Q3	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	435800000	USD
CY2016	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	68800000	USD
CY2017	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	77000000	USD
CY2018	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-28700000	USD
CY2017Q3	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	32000000	USD
CY2018Q3	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	22700000	USD
CY2016	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	7000000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	9500000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-5800000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Capital Loss Carryforwards DeferredTaxAssetsCapitalLossCarryforwards	400000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Charitable Contribution Carryforwards DeferredTaxAssetsCharitableContributionCarryforwards	12900000	USD
CY2017Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	285700000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	314200000	USD
CY2017Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	285200000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	312800000	USD
CY2017Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	169600000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	162700000	USD
CY2017Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	26000000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	8200000	USD
CY2017Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	58600000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	75600000	USD
CY2017Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	31500000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	25900000	USD
CY2017Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	500000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	1400000	USD
CY2017Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	707500000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	435800000	USD
CY2017Q3	us-gaap	Deferred Tax Liabilities Deferred Expense DeferredTaxLiabilitiesDeferredExpense	30600000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities Deferred Expense DeferredTaxLiabilitiesDeferredExpense	2300000	USD
CY2017Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	125800000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	110900000	USD
CY2017Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	728300000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	518300000	USD
CY2017	us-gaap	Defined Benefit Plan Benefit Obligation Increase Decrease For Remeasurement Due To Settlement DefinedBenefitPlanBenefitObligationIncreaseDecreaseForRemeasurementDueToSettlement	62200000	USD
CY2018	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Accumulated Postretirement Benefit Obligation1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1	7700000	USD
CY2018	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Service And Interest Cost Components1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1	1300000	USD
CY2018	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation	8400000	USD
CY2018	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents	1400000	USD
CY2017Q3	us-gaap	Defined Benefit Plan Pension Plan With Projected Benefit Obligation In Excess Of Plan Assets Projected Benefit Obligation DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation	748800000	USD
CY2018Q3	us-gaap	Defined Benefit Plan Pension Plan With Projected Benefit Obligation In Excess Of Plan Assets Projected Benefit Obligation DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation	664600000	USD
CY2017Q3	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	701400000	USD
CY2018Q3	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	636000000	USD
CY2017Q3	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Fair Value Of Plan Assets DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets	531600000	USD
CY2018Q3	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Fair Value Of Plan Assets DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets	499200000	USD
CY2017Q3	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate1 DefinedBenefitPlanUltimateHealthCareCostTrendRate1	0.0500
CY2018Q3	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate1 DefinedBenefitPlanUltimateHealthCareCostTrendRate1	0.0500
CY2017	us-gaap	Defined Benefit Plan Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate DefinedBenefitPlanYearHealthCareCostTrendRateReachesUltimateTrendRate	2023
CY2018	us-gaap	Defined Benefit Plan Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate DefinedBenefitPlanYearHealthCareCostTrendRateReachesUltimateTrendRate	2025
CY2016	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	0	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	0	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	0	USD
CY2016	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	137500000	USD
CY2017	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	154100000	USD
CY2018	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	168400000	USD
CY2017Q3	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	5300000	USD
CY2018Q3	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	14800000	USD
CY2017Q3	us-gaap	Derivative Assets DerivativeAssets	6200000	USD
CY2018Q3	us-gaap	Derivative Assets DerivativeAssets	19000000	USD
CY2017Q3	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	5900000	USD
CY2018Q3	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	13300000	USD
CY2017Q3	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	300000	USD
CY2018Q3	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	5700000	USD
CY2017Q3	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	13000000	USD
CY2018Q3	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	27400000	USD
CY2017Q3	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	13300000	USD
CY2018Q3	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	21000000	USD
CY2016	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	100000	USD
CY2017	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-6000000	USD
CY2018	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	4000000	USD
CY2017Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	8000000	USD
CY2018Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	6200000	USD
CY2017Q3	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	4900000	USD
CY2018Q3	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	6000000	USD
CY2017Q3	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	3100000	USD
CY2018Q3	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	200000	USD
CY2017Q3	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	5300000	USD
CY2018Q3	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	14800000	USD
CY2016	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	87500000	USD
CY2017	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	99200000	USD
CY2018	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	112100000	USD
CY2017Q3	us-gaap	Dividends Payable Current DividendsPayableCurrent	26600000	USD
CY2018Q3	us-gaap	Dividends Payable Current DividendsPayableCurrent	30000000	USD
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.26
CY2016	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	0.35
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.245
CY2016Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.99
CY2017Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.36
CY2017Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.45
CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.28
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.44
CY2017Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.40
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.03
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.52
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.51
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.35
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.24
CY2016Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.99
CY2017Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.36
CY2017Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.45
CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.28
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.43
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.39
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.03
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.52
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.51
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.33
CY2016	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.325
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.324
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.141
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.000
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.000
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	-0.359
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depreciation And Amortization EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciationAndAmortization	-0.034
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depreciation And Amortization EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciationAndAmortization	-0.023
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depreciation And Amortization EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciationAndAmortization	-0.023
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.017
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.022
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.016
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Prior Year Income Taxes EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes	-0.002
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Prior Year Income Taxes EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes	-0.009
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Prior Year Income Taxes EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes	-0.004
CY2016	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.028
CY2017	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.028
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.034
CY2017Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	38700000	USD
CY2018Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	39700000	USD
CY2016	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	2200000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	3300000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	1300000	USD
CY2018Q3	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	9400000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y9M18D
CY2016	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2900000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-1300000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-1500000	USD
CY2016	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	30000000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	51100000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	12600000	USD
CY2016	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	12300000	USD
CY2016	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1700000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1500000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4000000	USD
CY2017Q3	us-gaap	Energy Related Inventory Gas Stored Underground EnergyRelatedInventoryGasStoredUnderground	194900000	USD
CY2018Q3	us-gaap	Energy Related Inventory Gas Stored Underground EnergyRelatedInventoryGasStoredUnderground	175200000	USD
CY2017Q3	us-gaap	Energy Related Inventory Propane Gas EnergyRelatedInventoryPropaneGas	12000000	USD
CY2018Q3	us-gaap	Energy Related Inventory Propane Gas EnergyRelatedInventoryPropaneGas	12000000	USD
CY2015Q3	us-gaap	Goodwill Goodwill	946000000	USD
CY2016Q3	us-gaap	Goodwill Goodwill	1164900000	USD
CY2017Q3	us-gaap	Goodwill Goodwill	1171600000	USD
CY2018Q3	us-gaap	Goodwill Goodwill	1171600000	USD
CY2017	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	6700000	USD
CY2016	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	218900000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	213700000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	239200000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	187700000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	69500000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	77600000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-26500000	USD
CY2016	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	200000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	200000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	200000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	63000000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	32700000	USD
CY2016	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	-400000	USD
CY2017	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	5800000	USD
CY2018	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	6400000	USD
CY2016	us-gaap	Increase Decrease In Deferred Gas Cost IncreaseDecreaseInDeferredGasCost	52800000	USD
CY2017	us-gaap	Increase Decrease In Deferred Gas Cost IncreaseDecreaseInDeferredGasCost	50900000	USD
CY2018	us-gaap	Increase Decrease In Deferred Gas Cost IncreaseDecreaseInDeferredGasCost	-109000000	USD
CY2016	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-16500000	USD
CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	23500000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-15500000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	35000000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-11900000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	39500000	USD
CY2016	us-gaap	Increase Decrease In Unbilled Receivables IncreaseDecreaseInUnbilledReceivables	-26900000	USD
CY2017	us-gaap	Increase Decrease In Unbilled Receivables IncreaseDecreaseInUnbilledReceivables	40000000	USD
CY2016	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	11900000	USD
CY2017	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	9700000	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	10000000	USD
CY2017Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6546700000	USD
CY2018Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6843600000	USD
CY2017Q3	us-gaap	Liabilities Current LiabilitiesCurrent	1097900000	USD
CY2018	us-gaap	Increase Decrease In Unbilled Receivables IncreaseDecreaseInUnbilledReceivables	12800000	USD
CY2016	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	200000	shares
CY2017	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	100000	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	200000	shares
CY2016	us-gaap	Interest Expense InterestExpense	77200000	USD
CY2017	us-gaap	Interest Expense InterestExpense	89100000	USD
CY2018	us-gaap	Interest Expense InterestExpense	98400000	USD
CY2016	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	67600000	USD
CY2017	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	76800000	USD
CY2018	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	83000000	USD
CY2016	us-gaap	Interest Expense Other InterestExpenseOther	9600000	USD
CY2017	us-gaap	Interest Expense Other InterestExpenseOther	12300000	USD
CY2018	us-gaap	Interest Expense Other InterestExpenseOther	15400000	USD
CY2016	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	200000	USD
CY2017	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	800000	USD
CY2018	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	2600000	USD
CY2016	us-gaap	Interest Paid Net InterestPaidNet	72500000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	85500000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	95100000	USD
CY2017Q3	us-gaap	Interest Payable Current InterestPayableCurrent	14600000	USD
CY2018Q3	us-gaap	Interest Payable Current InterestPayableCurrent	15200000	USD
CY2018Q3	us-gaap	Liabilities Current LiabilitiesCurrent	1321700000	USD
CY2017Q3	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	1462500000	USD
CY2018Q3	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	1358500000	USD
CY2018	us-gaap	Line Of Credit Facility Average Outstanding Amount LineOfCreditFacilityAverageOutstandingAmount	408600000	USD
CY2018Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	175500000	USD
CY2018Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	332300000	USD
CY2018Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	52000000	USD
CY2018Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	57000000	USD
CY2018Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	43200000	USD
CY2017Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1995000000	USD
CY2018Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1900100000	USD
CY2018	us-gaap	Long Term Purchase Commitment Amount LongTermPurchaseCommitmentAmount	1240900000	USD
CY2018	us-gaap	Loss Contingency New Claims Filed Number LossContingencyNewClaimsFiledNumber	14	lawsuit
CY2018	us-gaap	Loss Contingency Number Of Plaintiffs LossContingencyNumberOfPlaintiffs	1600	plaintiff
CY2018Q3	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	1300000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	275800000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	147400000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	89100000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-612700000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-433500000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-531700000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	328300000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	288300000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	456600000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	144200000	USD
CY2016Q4	us-gaap	Net Income Loss NetIncomeLoss	45200000	USD
CY2017Q1	us-gaap	Net Income Loss NetIncomeLoss	108000000	USD
CY2017Q2	us-gaap	Net Income Loss NetIncomeLoss	21700000	USD
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	-13300000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	161600000	USD
CY2017Q4	us-gaap	Net Income Loss NetIncomeLoss	116000000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	98200000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	25900000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	-25900000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	214200000	USD
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	143700000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	161200000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	213700000	USD
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	143700000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	161200000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	213700000	USD
CY2016	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	8600000	USD
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	6600000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	6400000	USD
CY2017Q3	us-gaap	Notes Payable Current NotesPayableCurrent	477300000	USD
CY2018Q3	us-gaap	Notes Payable Current NotesPayableCurrent	553600000	USD
CY2017Q3	us-gaap	Notes Receivable Net NotesReceivableNet	12500000	USD
CY2018Q3	us-gaap	Notes Receivable Net NotesReceivableNet	13100000	USD
CY2018	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	operating_segment
CY2018	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	operating_segment
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	282300000	USD
CY2016Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	89100000	USD
CY2017Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	180400000	USD
CY2017Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	50300000	USD
CY2017Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	1900000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	321700000	USD
CY2017Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	105100000	USD
CY2018Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	141800000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	52400000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	-19600000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	279700000	USD
CY2018Q3	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	78500000	USD
CY2018Q3	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	9700000	USD
CY2018Q3	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	6500000	USD
CY2018Q3	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	6500000	USD
CY2018Q3	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	6700000	USD
CY2018Q3	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	7800000	USD
CY2018Q3	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	41300000	USD
CY2018Q3	us-gaap	Operating Leases Future Minimum Payments Receivable In Four Years OperatingLeasesFutureMinimumPaymentsReceivableInFourYears	500000	USD
CY2018Q3	us-gaap	Operating Leases Future Minimum Payments Receivable In Three Years OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears	2100000	USD
CY2016	us-gaap	Operating Leases Rent Expense Sublease Rentals1 OperatingLeasesRentExpenseSubleaseRentals1	2100000	USD
CY2017	us-gaap	Operating Leases Rent Expense Sublease Rentals1 OperatingLeasesRentExpenseSubleaseRentals1	2100000	USD
CY2018	us-gaap	Operating Leases Rent Expense Sublease Rentals1 OperatingLeasesRentExpenseSubleaseRentals1	2100000	USD
CY2018Q3	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	711900000	USD
CY2017Q3	us-gaap	Other Assets Current OtherAssetsCurrent	6200000	USD
CY2018Q3	us-gaap	Other Assets Current OtherAssetsCurrent	22300000	USD
CY2017Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	77100000	USD
CY2018Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	128900000	USD
CY2016	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	300000	USD
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	-400000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	-400000	USD
CY2016	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesBeforeTaxPortionAttributableToParent	-2900000	USD
CY2017	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesBeforeTaxPortionAttributableToParent	11500000	USD
CY2018	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesBeforeTaxPortionAttributableToParent	2400000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	-3200000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	11800000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	3100000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-2200000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	7400000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	2500000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	-1100000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	1500000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	300000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-400000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-400000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-1000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	4400000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	600000	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	-4000000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	11500000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	3900000	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-100000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	300000	USD
CY2017Q3	us-gaap	Other Inventory Purchased Goods OtherInventoryPurchasedGoods	18900000	USD
CY2018Q3	us-gaap	Other Inventory Purchased Goods OtherInventoryPurchasedGoods	23100000	USD
CY2017Q3	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	33100000	USD
CY2018Q3	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	58300000	USD
CY2017Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	63800000	USD
CY2018Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	66800000	USD
CY2016	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	4900000	USD
CY2017	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	4200000	USD
CY2018	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	44200000	USD
CY2017Q3	us-gaap	Other Receivables From Broker Dealers And Clearing Organizations OtherReceivablesFromBrokerDealersAndClearingOrganizations	4000000	USD
CY2018Q3	us-gaap	Other Receivables From Broker Dealers And Clearing Organizations OtherReceivablesFromBrokerDealersAndClearingOrganizations	4100000	USD
CY2016	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	500000	USD
CY2017	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	400000	USD
CY2018	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	500000	USD
CY2016	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Diluted ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted	500000	USD
CY2017	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Diluted ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted	400000	USD
CY2018	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Diluted ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted	500000	USD
CY2017Q3	us-gaap	Payables To Broker Dealers And Clearing Organizations PayablesToBrokerDealersAndClearingOrganizations	1500000	USD
CY2018Q3	us-gaap	Payables To Broker Dealers And Clearing Organizations PayablesToBrokerDealersAndClearingOrganizations	-6400000	USD
CY2016	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	1700000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-800000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	4200000	USD
CY2016	us-gaap	Payments Of Dividends PaymentsOfDividends	85200000	USD
CY2017	us-gaap	Payments Of Dividends PaymentsOfDividends	96200000	USD
CY2018	us-gaap	Payments Of Dividends PaymentsOfDividends	108700000	USD
CY2016	us-gaap	Payments To Acquire Business Two Net Of Cash Acquired PaymentsToAcquireBusinessTwoNetOfCashAcquired	0	USD
CY2017	us-gaap	Payments To Acquire Business Two Net Of Cash Acquired PaymentsToAcquireBusinessTwoNetOfCashAcquired	0	USD
CY2018	us-gaap	Payments To Acquire Business Two Net Of Cash Acquired PaymentsToAcquireBusinessTwoNetOfCashAcquired	28100000	USD
CY2016	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	317700000	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	-3800000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2016	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	293300000	USD
CY2017	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	438100000	USD
CY2018Q1	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	813400000	USD
CY2018Q2	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	350600000	USD
CY2018Q3	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	239200000	USD
CY2018	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	1965000000	USD
CY2016	us-gaap	Regulated Operating Revenue Gas RegulatedOperatingRevenueGas	1457200000	USD
CY2017	us-gaap	Regulated Operating Revenue Gas RegulatedOperatingRevenueGas	1660000000	USD
CY2018	us-gaap	Regulated Operating Revenue Gas RegulatedOperatingRevenueGas	1888000000	USD
CY2018	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	499400000	USD
CY2016	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	293300000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	438100000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	499400000	USD
CY2017Q3	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	237400000	USD
CY2018Q3	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	180200000	USD
CY2017Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2018Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2017Q3	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2018Q3	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2017Q3	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2018Q3	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2017Q3	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	28000000	USD
CY2018Q3	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	31000000	USD
CY2016	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	137100000	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	146900000	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	154700000	USD
CY2016	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	245000000	USD
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	420000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	75000000	USD
CY2016	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1800000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-8100000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-3200000	USD
CY2016	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	60700000	USD
CY2017	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	78600000	USD
CY2018	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	76300000	USD
CY2017Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	52000000	USD
CY2018Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	174500000	USD
CY2017Q3	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	1613200000	USD
CY2018Q3	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	1682800000	USD
CY2017Q3	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	3665200000	USD
CY2018Q3	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	3970500000	USD
CY2017Q3	us-gaap	Public Utilities Property Plant And Equipment Transmission And Distribution PublicUtilitiesPropertyPlantAndEquipmentTransmissionAndDistribution	5278400000	USD
CY2018Q3	us-gaap	Public Utilities Property Plant And Equipment Transmission And Distribution PublicUtilitiesPropertyPlantAndEquipmentTransmissionAndDistribution	5653300000	USD
CY2018	us-gaap	Reclassification From Aoci Current Period Tax ReclassificationFromAociCurrentPeriodTax	700000	USD
CY2017Q3	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	0	USD
CY2018Q3	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	7900000	USD
CY2016	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	1537300000	USD
CY2016Q4	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	495100000	USD
CY2017Q1	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	663400000	USD
CY2017Q2	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	323500000	USD
CY2017Q3	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	258700000	USD
CY2017	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	1740700000	USD
CY2017Q4	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	561800000	USD
CY2017Q3	us-gaap	Regulatory Assets RegulatoryAssets	966600000	USD
CY2018Q3	us-gaap	Regulatory Assets RegulatoryAssets	742600000	USD
CY2017Q3	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	175500000	USD
CY2018Q3	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	72800000	USD
CY2017Q3	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	791100000	USD
CY2018Q3	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	669800000	USD
CY2017Q3	us-gaap	Regulatory Liabilities RegulatoryLiabilities	179800000	USD
CY2018Q3	us-gaap	Regulatory Liabilities RegulatoryLiabilities	390300000	USD
CY2017Q3	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	22600000	USD
CY2018Q3	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	35700000	USD
CY2017Q3	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	157200000	USD
CY2018Q3	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	354600000	USD
CY2017Q3	us-gaap	Remaining Amounts Of Regulatory Assets For Which No Return On Investment During Recovery Period Is Provided RemainingAmountsOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided	380300000	USD
CY2018Q3	us-gaap	Remaining Amounts Of Regulatory Assets For Which No Return On Investment During Recovery Period Is Provided RemainingAmountsOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided	259800000	USD
CY2018	us-gaap	Remaining Recovery Period Of Regulatory Assets For Which No Return On Investment During Recovery Period Is Provided1 RemainingRecoveryPeriodOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided1	P15Y
CY2016	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	80000000	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	393800000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	105000000	USD
CY2018Q3	us-gaap	Restricted Cash RestrictedCash	17000000	USD
CY2017Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	614200000	USD
CY2018Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	715600000	USD
CY2017Q3	us-gaap	Retained Earnings Unappropriated RetainedEarningsUnappropriated	1010800000	USD
CY2018Q3	us-gaap	Retained Earnings Unappropriated RetainedEarningsUnappropriated	1097600000	USD
CY2017Q2	us-gaap	Sale Of Stock Number Of Shares Issued In Transaction SaleOfStockNumberOfSharesIssuedInTransaction	2504684	shares
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1	P3Y
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.150
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.163
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.160
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0114
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0139
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0176
CY2018Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	1000000	shares
CY2016	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P2Y9M18D
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P2Y9M18D
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P2Y10M24D
CY2017Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	477300000	USD
CY2018Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	553600000	USD
CY2017Q3	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.015
CY2018Q3	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.024
CY2018	us-gaap	Shortterm Debt Maximum Amount Outstanding During Period ShorttermDebtMaximumAmountOutstandingDuringPeriod	632900000	USD
CY2016Q2	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	2185000	shares
CY2016	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	1400000	USD
CY2017	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	1600000	USD
CY2018	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	1600000	USD
CY2016Q2	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	133200000	USD
CY2016	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	133200000	USD
CY2017	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	145500000	USD
CY2018	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	153000000	USD
CY2016	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	500000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2017	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	100000	USD
CY2018	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	0	USD
CY2016	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	6700000	USD
CY2017	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	8300000	USD
CY2015Q3	us-gaap	Stockholders Equity StockholdersEquity	1573600000	USD
CY2016Q3	us-gaap	Stockholders Equity StockholdersEquity	1768200000	USD
CY2017Q3	us-gaap	Stockholders Equity StockholdersEquity	1991300000	USD
CY2018Q3	us-gaap	Stockholders Equity StockholdersEquity	2255400000	USD
CY2018Q3	us-gaap	Tax Credit Carryforward Amount TaxCreditCarryforwardAmount	2400000	USD
CY2017Q3	us-gaap	Taxes Payable Current TaxesPayableCurrent	61000000	USD
CY2018Q3	us-gaap	Taxes Payable Current TaxesPayableCurrent	65400000	USD
CY2017Q3	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	15200000	USD
CY2018Q3	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	14000000	USD
CY2017Q3	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	3400000	USD
CY2018Q3	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	6900000	USD
CY2015Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	7100000	USD
CY2016Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	10000000	USD
CY2017Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	11000000	USD
CY2018Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	8100000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	4000000	USD
CY2017Q3	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued	0	USD
CY2018Q3	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued	0	USD
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	3400000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2400000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1200000	USD
CY2017Q3	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	0	USD
CY2018Q3	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	0	USD
CY2016	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	500000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1400000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	100000	USD
CY2017Q3	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	5100000	USD
CY2018Q3	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	3900000	USD
CY2016	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	80100000	USD
CY2017	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	80700000	USD
CY2018	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	77000000	USD
CY2016	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	1131800000	USD
CY2017	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	1266800000	USD
CY2018	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	1545200000	USD
CY2016	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	136900000	USD
CY2017	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	153500000	USD
CY2018	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	167000000	USD
CY2016	us-gaap	Utilities Operating Expense Gas And Petroleum Purchased UtilitiesOperatingExpenseGasAndPetroleumPurchased	492200000	USD
CY2017	us-gaap	Utilities Operating Expense Gas And Petroleum Purchased UtilitiesOperatingExpenseGasAndPetroleumPurchased	570500000	USD
CY2018	us-gaap	Utilities Operating Expense Gas And Petroleum Purchased UtilitiesOperatingExpenseGasAndPetroleumPurchased	770100000	USD
CY2016	us-gaap	Utilities Operating Expense Maintenance Operations And Other Costs And Expenses UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses	377500000	USD
CY2017	us-gaap	Utilities Operating Expense Maintenance Operations And Other Costs And Expenses UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses	405000000	USD
CY2018	us-gaap	Utilities Operating Expense Maintenance Operations And Other Costs And Expenses UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses	455600000	USD
CY2016	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	125200000	USD
CY2017	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	137800000	USD
CY2018	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	152500000	USD
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	44300000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	47000000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	49300000	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	44100000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	46900000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	49100000	shares
CY2018	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><font style="font-family:Georgia,serif;font-size:10pt;font-weight:bold;">USE OF ESTIMATES </font><font style="font-family:Georgia,serif;font-size:10pt;">– The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates.</font></div></div>

Files In Submission

Name	View Source	Status
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spireconsolidated10k93018.htm	Edgar Link	pending

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$SR
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2018 Q3 Form 10-K Financial Statement

#000112695618000065 Filed on November 15, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SR Spire Inc Stock $sr

2018 Q3 Form 10-K Financial Statement

#000112695618000065 Filed on November 15, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SR
Spire Inc Stock $sr