$SR
SPIRE INC Stock $sr

$sr Overview Financials Valuation SEC Filings Company Website

2016 Q3 Form 10-K Financial Statement

#000112695617000063 Filed on November 15, 2017

Income Statement

Concept	2016 Q3	2016 Q2	2016 Q1
Revenue	$279.3M	$249.3M	$609.3M
YoY Change	36.78%	-9.41%	-30.56%
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	$35.50M	$34.40M	$33.90M
YoY Change	6.29%	5.2%	4.63%
% of Gross Profit
Operating Expenses	$287.0M	$214.0M	$441.6M
YoY Change	34.93%	-10.54%	-38.64%
Operating Profit	-$7.700M	$35.30M	$167.7M
YoY Change	-9.41%	-1.94%	6.34%
Interest Expense	-$19.50M	$19.40M	$19.30M
YoY Change	5.41%	8.99%	1.05%
% of Operating Profit		54.96%	11.51%
Other Income/Expense, Net	$4.800M	$1.600M	$800.0K
YoY Change	-442.86%	220.0%	14.29%
Pretax Income	-$22.40M	$17.50M	$149.2M
YoY Change	-21.13%	-6.42%	7.11%
Income Tax	-$8.200M	$6.800M	$48.40M
% Of Pretax Income		38.86%	32.44%
Net Earnings	-$14.20M	$10.70M	$100.8M
YoY Change	-24.06%	-24.11%	6.78%
Net Earnings / Revenue	-5.08%	4.29%	16.54%
Basic Earnings Per Share	-$0.31	$0.24	$2.32
Diluted Earnings Per Share	-$0.31	$0.24	$2.31
COMMON SHARES
Basic Shares Outstanding	45.64M shares	44.40M shares	43.30M shares
Diluted Shares Outstanding		44.60M shares	43.50M shares

Balance Sheet

Concept	2016 Q3	2016 Q2	2016 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments	$5.200M	$4.900M	$8.700M
YoY Change	-62.32%	-14.04%	-81.45%
Cash & Equivalents	$5.200M	$4.900M	$8.700M
Short-Term Investments
Other Short-Term Assets	$131.7M	$91.50M	$86.60M
YoY Change	80.41%	9.58%	-22.75%
Inventory	$202.3M	$143.9M	$124.0M
Prepaid Expenses
Receivables	$220.7M	$195.6M	$265.0M
Other Receivables	$9.700M	$17.50M	$19.50M
Total Short-Term Assets	$569.6M	$453.4M	$503.8M
YoY Change	7.45%	-6.13%	-20.94%
LONG-TERM ASSETS
Property, Plant & Equipment	$13.70M	$13.80M	$13.80M
YoY Change	0.0%	13.11%	31.43%
Goodwill	$1.165B	$946.0M	$946.0M
YoY Change	23.14%	0.0%	0.0%
Intangibles
YoY Change
Long-Term Investments	$62.10M	$62.40M	$61.10M
YoY Change	3.67%	-1.11%	0.49%
Other Assets	$128.9M	$64.70M	$65.00M
YoY Change	70.95%	0.0%	-5.25%
Total Long-Term Assets	$5.495B	$4.846B	$4.804B
YoY Change	15.74%	5.34%	5.73%
TOTAL ASSETS
Total Short-Term Assets	$569.6M	$453.4M	$503.8M
Total Long-Term Assets	$5.495B	$4.846B	$4.804B
Total Assets	$6.064B	$5.299B	$5.308B
YoY Change	14.91%	4.25%	2.45%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$210.9M	$135.8M	$127.1M
YoY Change	43.96%	-8.31%	-20.61%
Accrued Expenses	$54.60M	$56.20M	$40.90M
YoY Change	16.17%	12.63%	-10.7%
Deferred Revenue
YoY Change
Short-Term Debt	$398.7M	$97.60M	$253.6M
YoY Change	17.96%	-53.83%	2.42%
Long-Term Debt Due	$250.0M	$0.00	$0.00
YoY Change	212.5%	-100.0%	-100.0%
Total Short-Term Liabilities	$1.161B	$491.8M	$618.8M
YoY Change	36.02%	-31.73%	-27.52%
LONG-TERM LIABILITIES
Long-Term Debt	$1.821B	$1.840B	$1.839B
YoY Change	2.78%	5.95%	5.93%
Other Long-Term Liabilities	$66.10M	$73.70M	$75.50M
YoY Change	-14.49%	-6.59%	-6.44%
Total Long-Term Liabilities	$1.887B	$1.914B	$1.915B
YoY Change	72.89%	88.06%	95.57%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.161B	$491.8M	$618.8M
Total Long-Term Liabilities	$1.887B	$1.914B	$1.915B
Total Liabilities	$3.048B	$2.405B	$2.534B
YoY Change	56.71%	38.4%	38.24%
SHAREHOLDERS EQUITY
Retained Earnings	$550.9M	$588.6M	$599.4M
YoY Change	11.47%	10.45%	11.16%
Common Stock	$45.60M	$45.60M	$43.40M
YoY Change	5.31%	5.31%	0.23%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.768B	$1.802B	$1.681B
YoY Change
Total Liabilities & Shareholders Equity	$6.064B	$5.299B	$5.308B
YoY Change	14.63%	4.25%	2.45%

Cashflow Statement

Concept	2016 Q3	2016 Q2	2016 Q1
OPERATING ACTIVITIES
Net Income	-$14.20M	$10.70M	$100.8M
YoY Change	-24.06%	-24.11%	6.78%
Depreciation, Depletion And Amortization	$35.50M	$34.40M	$33.90M
YoY Change	6.29%	5.2%	4.63%
Cash From Operating Activities	-$28.60M	$113.9M	$209.5M
YoY Change	-34.85%	31.83%	-33.28%
INVESTING ACTIVITIES
Capital Expenditures	-$98.00M	-$73.50M	-$59.40M
YoY Change	12.77%	0.14%	-14.53%
Acquisitions
YoY Change
Other Investing Activities	-$317.9M	-$800.0K	-$300.0K
YoY Change	-318000.0%		-96.43%
Cash From Investing Activities	-$415.9M	-$74.30M	-$59.70M
YoY Change	379.15%	1.23%	-23.36%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	444.8M	-43.40M	-145.7M
YoY Change	220.46%	-19.93%	-28.08%
NET CHANGE
Cash From Operating Activities	-28.60M	113.9M	209.5M
Cash From Investing Activities	-415.9M	-74.30M	-59.70M
Cash From Financing Activities	444.8M	-43.40M	-145.7M
Net Change In Cash	300.0K	-3.800M	4.100M
YoY Change	-96.3%	-90.78%	-87.76%
FREE CASH FLOW
Cash From Operating Activities	-$28.60M	$113.9M	$209.5M
Capital Expenditures	-$98.00M	-$73.50M	-$59.40M
Free Cash Flow	$69.40M	$187.4M	$268.9M
YoY Change	61.4%	17.27%	-29.88%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2017	lg	Remaining Recovery Periodof Certain Regulatory Assetsforwhich No Returnon Investment During Recovery Periodis Provided RemainingRecoveryPeriodofCertainRegulatoryAssetsforwhichNoReturnonInvestmentDuringRecoveryPeriodisProvided	P20Y
CY2017	us-gaap	Remaining Recovery Period Of Regulatory Assets For Which No Return On Investment During Recovery Period Is Provided1 RemainingRecoveryPeriodOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided1	P15Y
CY2017	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2017	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2017
CY2017	dei	Document Period End Date DocumentPeriodEndDate	2017-09-30
CY2017	dei	Document Type DocumentType	10-K
CY2017	dei	Amendment Flag AmendmentFlag	false
CY2017	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--09-30
CY2017	dei	Entity Central Index Key EntityCentralIndexKey	0001126956
CY2017Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	48266858	shares
CY2017	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2017	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2017Q1	dei	Entity Public Float EntityPublicFloat	2989327838	USD
CY2017	dei	Entity Registrant Name EntityRegistrantName	SPIRE INC
CY2017	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2017Q3	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate1 DefinedBenefitPlanUltimateHealthCareCostTrendRate1	0.0500
CY2017	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2015	lg	Add Acquisition Divestiture And Restructuring Activities AddAcquisitionDivestitureAndRestructuringActivities	9800000	USD
CY2016	lg	Add Acquisition Divestiture And Restructuring Activities AddAcquisitionDivestitureAndRestructuringActivities	9200000	USD
CY2017	lg	Add Acquisition Divestiture And Restructuring Activities AddAcquisitionDivestitureAndRestructuringActivities	4000000	USD
CY2015	lg	Add Lower Of Cost Or Market Inventory Adjustments Net Of Tax AddLowerOfCostOrMarketInventoryAdjustmentsNetOfTax	400000	USD
CY2016	lg	Add Lower Of Cost Or Market Inventory Adjustments Net Of Tax AddLowerOfCostOrMarketInventoryAdjustmentsNetOfTax	200000	USD
CY2017	lg	Add Lower Of Cost Or Market Inventory Adjustments Net Of Tax AddLowerOfCostOrMarketInventoryAdjustmentsNetOfTax	0	USD
CY2017	lg	Anticipated Contributions To Pension Plans Non Qualified Trusts AnticipatedContributionsToPensionPlansNonQualifiedTrusts	500000	USD
CY2017	lg	Anticipated Contributions To Pension Plans Qualified Trusts AnticipatedContributionsToPensionPlansQualifiedTrusts	35500000	USD
CY2016Q3	lg	Capitalization Percentof Common Stock Equity CapitalizationPercentofCommonStockEquity	0.461
CY2017Q3	lg	Capitalization Percentof Common Stock Equity CapitalizationPercentofCommonStockEquity	0.487
CY2016Q3	lg	Capitalization Percentof Long Term Debt CapitalizationPercentofLongTermDebt	0.539
CY2017Q3	lg	Capitalization Percentof Long Term Debt CapitalizationPercentofLongTermDebt	0.513
CY2014Q2	lg	Corporate Units Stated Value Per Unit CorporateUnitsStatedValuePerUnit	50000000
CY2016Q3	lg	Debt Instrument Principal Outstanding Excluding Current Portion DebtInstrumentPrincipalOutstandingExcludingCurrentPortion	1835800000	USD
CY2017Q3	lg	Debt Instrument Principal Outstanding Excluding Current Portion DebtInstrumentPrincipalOutstandingExcludingCurrentPortion	2012000000	USD
CY2017	lg	Defined Benefit Plan Lumpsum Payment Recognizedas Settlement Gain Loss Minimum Threshold DefinedBenefitPlanLumpsumPaymentRecognizedasSettlementGainLossMinimumThreshold	1
CY2017	lg	Defined Benefit Plan Medical Insurance Offered Post Early Retirement Until Age Maximum DefinedBenefitPlanMedicalInsuranceOfferedPostEarlyRetirementUntilAgeMaximum	P65Y
CY2016	lg	Difference Between Replacement Cost Of Gas Storage And Inventory Basis Amount DifferenceBetweenReplacementCostOfGasStorageAndInventoryBasisAmount	11400000	USD
CY2017	lg	Difference Between Replacement Cost Of Gas Storage And Inventory Basis Amount DifferenceBetweenReplacementCostOfGasStorageAndInventoryBasisAmount	20800000	USD
CY2017Q3	lg	Effecton Cash Flows Impactof One Percent Adverse Changein Interest Rate EffectonCashFlowsImpactofOnePercentAdverseChangeinInterestRate	-4900000	USD
CY2015	lg	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Total Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTotalAmount	6700000	USD
CY2016	lg	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Total Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTotalAmount	6700000	USD
CY2017	lg	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Total Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTotalAmount	7400000	USD
CY2017	lg	Gains Or Losses Includible In Cost Amortized To Extent Exceeds Projected Benefit Obligations Or Market Related Value Of Plan Assets Percentage GainsOrLossesIncludibleInCostAmortizedToExtentExceedsProjectedBenefitObligationsOrMarketRelatedValueOfPlanAssetsPercentage	0.1
CY2015	lg	Gross Receipts Tax Amounts Included Operating Revenues GrossReceiptsTaxAmountsIncludedOperatingRevenues	97300000	USD
CY2016	lg	Gross Receipts Tax Amounts Included Operating Revenues GrossReceiptsTaxAmountsIncludedOperatingRevenues	75500000	USD
CY2017	lg	Gross Receipts Tax Amounts Included Operating Revenues GrossReceiptsTaxAmountsIncludedOperatingRevenues	84600000	USD
CY2017	lg	Implementation Period Used To Calculate Return On Plan Assets ImplementationPeriodUsedToCalculateReturnOnPlanAssets	P4Y
CY2016Q3	lg	Long Term Debt Current Maturities Excluding Notes Payable LongTermDebtCurrentMaturitiesExcludingNotesPayable	250000000	USD
CY2017Q3	lg	Long Term Debt Current Maturities Excluding Notes Payable LongTermDebtCurrentMaturitiesExcludingNotesPayable	100000000	USD
CY2016Q3	lg	Natural Gas Receivable NaturalGasReceivable	9700000	USD
CY2017Q3	lg	Natural Gas Receivable NaturalGasReceivable	1900000	USD
CY2015	lg	Net Economic Earnings NetEconomicEarnings	138300000	USD
CY2016	lg	Net Economic Earnings NetEconomicEarnings	149100000	USD
CY2017	lg	Net Economic Earnings NetEconomicEarnings	167600000	USD
CY2015	lg	Net Economic Earnings Reconciliation Adjustments Income Tax Effect NetEconomicEarningsReconciliationAdjustmentsIncomeTaxEffect	-800000	USD
CY2016	lg	Net Economic Earnings Reconciliation Adjustments Income Tax Effect NetEconomicEarningsReconciliationAdjustmentsIncomeTaxEffect	-2800000	USD
CY2017	lg	Net Economic Earnings Reconciliation Adjustments Income Tax Effect NetEconomicEarningsReconciliationAdjustmentsIncomeTaxEffect	-3700000	USD
CY2015	lg	Non Regulated Gas Marketingand Other Operating Expenses NonRegulatedGasMarketingandOtherOperatingExpenses	158900000	USD
CY2016	lg	Non Regulated Gas Marketingand Other Operating Expenses NonRegulatedGasMarketingandOtherOperatingExpenses	123200000	USD
CY2017	lg	Non Regulated Gas Marketingand Other Operating Expenses NonRegulatedGasMarketingandOtherOperatingExpenses	152200000	USD
CY2017Q3	lg	Nonmonetary Notional Amount Of Natural Gas Derivative Contracts Not Designated As Normal Purchases Or Normal Sales NonmonetaryNotionalAmountOfNaturalGasDerivativeContractsNotDesignatedAsNormalPurchasesOrNormalSales	202100000	MMBTU
CY2017Q3	lg	Notional Amountof Non Exchange Traded Natural Gas Commodity Contracts To Be Settledin The Next Twelve Months NotionalAmountofNonExchangeTradedNaturalGasCommodityContractsToBeSettledinTheNextTwelveMonths	156800000	MMBTU
CY2017Q3	lg	Notional Amountof Non Exchange Traded Natural Gas Commodity Contracts To Be Settledin Year Five NotionalAmountofNonExchangeTradedNaturalGasCommodityContractsToBeSettledinYearFive	900000	MMBTU
CY2017Q3	lg	Notional Amountof Non Exchange Traded Natural Gas Commodity Contracts To Be Settledin Year Four NotionalAmountofNonExchangeTradedNaturalGasCommodityContractsToBeSettledinYearFour	4100000	MMBTU
CY2017Q3	lg	Notional Amountof Non Exchange Traded Natural Gas Commodity Contracts To Be Settledin Year Six NotionalAmountofNonExchangeTradedNaturalGasCommodityContractsToBeSettledinYearSix	100000	MMBTU
CY2017Q3	lg	Notional Amountof Non Exchange Traded Natural Gas Commodity Contracts To Be Settledin Year Three NotionalAmountofNonExchangeTradedNaturalGasCommodityContractsToBeSettledinYearThree	5900000	MMBTU
CY2017Q3	lg	Notional Amountof Non Exchange Traded Natural Gas Commodity Contracts To Be Settledin Year Two NotionalAmountofNonExchangeTradedNaturalGasCommodityContractsToBeSettledinYearTwo	34300000	MMBTU
CY2017Q3	lg	Number Of Counterparties For Which Credit Risk Is Disclosed NumberOfCounterpartiesForWhichCreditRiskIsDisclosed	5	counterparty
CY2013Q4	lg	Number Of Incident Fatalities NumberOfIncidentFatalities	1	fatality
CY2014Q2	lg	Number Of Shares Authorized For Issuance Under Dividend Reinvestment And Stock Purchase Program In Shares NumberOfSharesAuthorizedForIssuanceUnderDividendReinvestmentAndStockPurchaseProgramInShares	250000	shares
CY2017Q3	lg	Number Of Shares Remaining And Available For Issuance Under Dividend Reinvestment And Stock Purchase Program In Shares NumberOfSharesRemainingAndAvailableForIssuanceUnderDividendReinvestmentAndStockPurchaseProgramInShares	244130	shares
CY2016Q4	lg	Number Of Shares Remaining And Available For Issuance Under Dividend Reinvestment And Stock Purchase Program In Shares NumberOfSharesRemainingAndAvailableForIssuanceUnderDividendReinvestmentAndStockPurchaseProgramInShares	239945	shares
CY2017	lg	Numberof Monthsofthe Original Maturityof Debt Instruments Purchased NumberofMonthsoftheOriginalMaturityofDebtInstrumentsPurchased	P3M
CY2016Q3	lg	Other Accounts Receivable OtherAccountsReceivable	113400000	USD
CY2017Q3	lg	Other Accounts Receivable OtherAccountsReceivable	149200000	USD
CY2016Q3	lg	Other Investments Other Property OtherInvestmentsOtherProperty	62100000	USD
CY2017Q3	lg	Other Investments Other Property OtherInvestmentsOtherProperty	64200000	USD
CY2016Q3	lg	Other Property And Investments OtherPropertyAndInvestments	1240700000	USD
CY2017Q3	lg	Other Property And Investments OtherPropertyAndInvestments	1287800000	USD
CY2016Q3	lg	Other Regulatory Assets Current OtherRegulatoryAssetsCurrent	44200000	USD
CY2017Q3	lg	Other Regulatory Assets Current OtherRegulatoryAssetsCurrent	72900000	USD
CY2016Q3	lg	Other Regulatory Liabilities Current OtherRegulatoryLiabilitiesCurrent	28900000	USD
CY2017Q3	lg	Other Regulatory Liabilities Current OtherRegulatoryLiabilitiesCurrent	21600000	USD
CY2017Q2	lg	Paymentto Purchase Share Price Per Share PaymenttoPurchaseSharePricePerShare	67.50
CY2011Q1	lg	Postretirement Benefit Plans Recoveryin Rates Base Allowance PostretirementBenefitPlansRecoveryinRatesBaseAllowance	9500000	USD
CY2015	lg	Realized Gain Loss On Economic Hedges Prior To Sale Of Physical Commodity Net Of Tax RealizedGainLossOnEconomicHedgesPriorToSaleOfPhysicalCommodityNetOfTax	-2400000	USD
CY2016	lg	Realized Gain Loss On Economic Hedges Prior To Sale Of Physical Commodity Net Of Tax RealizedGainLossOnEconomicHedgesPriorToSaleOfPhysicalCommodityNetOfTax	1600000	USD
CY2017	lg	Realized Gain Loss On Economic Hedges Prior To Sale Of Physical Commodity Net Of Tax RealizedGainLossOnEconomicHedgesPriorToSaleOfPhysicalCommodityNetOfTax	300000	USD
CY2016Q3	lg	Regulatory Pension And Other Postretirement Benefits RegulatoryPensionAndOtherPostretirementBenefits	106800000	USD
CY2017Q3	lg	Regulatory Pension And Other Postretirement Benefits RegulatoryPensionAndOtherPostretirementBenefits	108000000	USD
CY2017Q3	lg	Retained Earnings Dividend Restrictions Formula Component Fixed Amount RetainedEarningsDividendRestrictionsFormulaComponentFixedAmount	8000000.0	USD
CY2017Q2	lg	Share Purchase Obligation Conversionto Common Stock Rate Per Share SharePurchaseObligationConversiontoCommonStockRatePerShare	0.8712
CY2016	lg	Short Term Borrowings Minimum Amount Outstanding During Period ShortTermBorrowingsMinimumAmountOutstandingDuringPeriod	73100000	USD
CY2017	lg	Short Term Borrowings Minimum Amount Outstanding During Period ShortTermBorrowingsMinimumAmountOutstandingDuringPeriod	395500000	USD
CY2017	lg	Short Term Debt Speculative Interest Rate Increase ShortTermDebtSpeculativeInterestRateIncrease	0.01
CY2016Q3	lg	Unamortized Purchased Gas Adjustments UnamortizedPurchasedGasAdjustments	1700000	USD
CY2017Q3	lg	Unamortized Purchased Gas Adjustments UnamortizedPurchasedGasAdjustments	1000000	USD
CY2016Q3	lg	Unamortized Purchased Gas Adjustments Assets UnamortizedPurchasedGasAdjustmentsAssets	49700000	USD
CY2017Q3	lg	Unamortized Purchased Gas Adjustments Assets UnamortizedPurchasedGasAdjustmentsAssets	102600000	USD
CY2016Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	210900000	USD
CY2017Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	257100000	USD
CY2016Q3	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	127800000	USD
CY2017Q3	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	140500000	USD
CY2016Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	8100000	USD
CY2017Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	8600000	USD
CY2016Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-4200000	USD
CY2017Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	3200000	USD
CY2016Q3	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	1175900000	USD
CY2017Q3	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	1325600000	USD
CY2015	us-gaap	Adjustments To Additional Paid In Capital Income Tax Deficiency From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalIncomeTaxDeficiencyFromShareBasedCompensation	1600000	USD
CY2016	us-gaap	Adjustments To Additional Paid In Capital Income Tax Deficiency From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalIncomeTaxDeficiencyFromShareBasedCompensation	1700000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Income Tax Deficiency From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalIncomeTaxDeficiencyFromShareBasedCompensation	2200000	USD
CY2015	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	700000	USD
CY2015	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	4900000	USD
CY2016	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	4500000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	4100000	USD
CY2015	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	3000000	USD
CY2016	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	2800000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	2600000	USD
CY2016Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	20500000	USD
CY2017Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	18300000	USD
CY2017Q2	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2500000	shares
CY2017	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2875000	shares
CY2015Q3	us-gaap	Asset Retirement Obligation AssetRetirementObligation	159200000	USD
CY2016Q3	us-gaap	Asset Retirement Obligation AssetRetirementObligation	206400000	USD
CY2017Q3	us-gaap	Asset Retirement Obligation AssetRetirementObligation	296600000	USD
CY2016	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	13200000	USD
CY2017	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	9100000	USD
CY2016	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	4100000	USD
CY2017	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	5500000	USD
CY2016	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	9500000	USD
CY2017	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	4600000	USD
CY2016	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	27500000	USD
CY2017	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	80200000	USD
CY2016Q3	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	206400000	USD
CY2017Q3	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	296600000	USD
CY2015Q3	us-gaap	Assets Assets	5277600000	USD
CY2016Q3	us-gaap	Assets Assets	6064400000	USD
CY2017Q3	us-gaap	Assets Assets	6546700000	USD
CY2016Q3	us-gaap	Assets Current AssetsCurrent	569600000	USD
CY2017Q3	us-gaap	Assets Current AssetsCurrent	725500000	USD
CY2015	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	13400000	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
CY2016Q3	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	3588900000	USD
CY2017Q3	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	3986300000	USD
CY2015	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	12100000	USD
CY2017	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	2000000	USD
CY2014Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	16100000	USD
CY2015Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	13800000	USD
CY2016Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	5200000	USD
CY2017Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	7400000	USD
CY2015	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-2300000	USD
CY2016	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-8600000	USD
CY2017	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	2200000	USD
CY2017	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	0	USD
CY2016Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2017Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2015	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.84
CY2016	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.96
CY2017	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.10
CY2016Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2017Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2016Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	70000000	shares
CY2017Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	70000000	shares
CY2016Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	45650642	shares
CY2017Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	48263243	shares
CY2016Q3	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	45600000	USD
CY2017Q3	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	48300000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	136600000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	142000000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	169000000	USD
CY2015	us-gaap	Costs And Expenses CostsAndExpenses	1703900000	USD
CY2016	us-gaap	Costs And Expenses CostsAndExpenses	1255000000	USD
CY2017	us-gaap	Costs And Expenses CostsAndExpenses	1419000000	USD
CY2017Q3	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	8300000	USD
CY2015	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-3300000	USD
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	100000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	100000	USD
CY2015	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	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
CY2016Q3	us-gaap	Customer Deposits Current CustomerDepositsCurrent	34900000	USD
CY2017Q3	us-gaap	Customer Deposits Current CustomerDepositsCurrent	34900000	USD
CY2017Q3	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	2112000000	USD
CY2014	us-gaap	Debt Instrument Convertible Number Of Equity Instruments DebtInstrumentConvertibleNumberOfEquityInstruments	2875000	equity_unit
CY2016	us-gaap	Debt Instrument Interest Rate During Period DebtInstrumentInterestRateDuringPeriod	0.009
CY2017	us-gaap	Debt Instrument Interest Rate During Period DebtInstrumentInterestRateDuringPeriod	0.012
CY2016Q3	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	2100000	USD
CY2017Q3	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	1800000	USD
CY2016Q3	us-gaap	Deferred Costs DeferredCosts	966900000	USD
CY2017Q3	us-gaap	Deferred Costs DeferredCosts	868200000	USD
CY2015	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	58800000	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
CY2016Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	798300000	USD
CY2017Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	992700000	USD
CY2017Q3	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	707500000	USD
CY2015	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	65500000	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
CY2016Q3	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	70200000	USD
CY2017Q3	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	32000000	USD
CY2015	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	6900000	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
CY2017Q3	us-gaap	Deferred Tax Assets Charitable Contribution Carryforwards DeferredTaxAssetsCharitableContributionCarryforwards	12100000	USD
CY2016Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	191900000	USD
CY2017Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	285700000	USD
CY2016Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	191000000	USD
CY2017Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	285200000	USD
CY2016Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	102300000	USD
CY2017Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	169600000	USD
CY2016Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	0	USD
CY2017Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	26000000	USD
CY2016Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	68300000	USD
CY2017Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	58600000	USD
CY2016Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	21300000	USD
CY2017Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	31500000	USD
CY2016Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	900000	USD
CY2017Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	500000	USD
CY2016Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	607300000	USD
CY2017Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	707500000	USD
CY2016Q3	us-gaap	Deferred Tax Liabilities Deferred Expense DeferredTaxLiabilitiesDeferredExpense	20000000	USD
CY2017Q3	us-gaap	Deferred Tax Liabilities Deferred Expense DeferredTaxLiabilitiesDeferredExpense	30600000	USD
CY2016Q3	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	607300000	USD
CY2016Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	48400000	USD
CY2017Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	125800000	USD
CY2016Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	623100000	USD
CY2017Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	728300000	USD
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Accumulated Postretirement Benefit Obligation1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1	9200000	USD
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Service And Interest Cost Components1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1	1400000	USD
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation	10000000	USD
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents	1700000	USD
CY2016Q3	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	724500000	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
CY2016Q3	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Fair Value Of Plan Assets DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets	540500000	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
CY2016Q3	us-gaap	Defined Benefit Plan Plans With Benefit Obligations In Excess Of Plan Assets Aggregate Benefit Obligation DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAggregateBenefitObligation	794700000	USD
CY2017Q3	us-gaap	Defined Benefit Plan Plans With Benefit Obligations In Excess Of Plan Assets Aggregate Benefit Obligation DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAggregateBenefitObligation	748800000	USD
CY2016Q3	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate1 DefinedBenefitPlanUltimateHealthCareCostTrendRate1	0.0500
CY2016	us-gaap	Defined Benefit Plan Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate DefinedBenefitPlanYearHealthCareCostTrendRateReachesUltimateTrendRate	2023
CY2017	us-gaap	Defined Benefit Plan Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate DefinedBenefitPlanYearHealthCareCostTrendRateReachesUltimateTrendRate	2023
CY2015	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	130800000	USD
CY2016	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	137500000	USD
CY2017	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	154100000	USD
CY2016Q3	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	7600000	USD
CY2017Q3	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	5300000	USD
CY2016Q3	us-gaap	Derivative Assets DerivativeAssets	13300000	USD
CY2017Q3	us-gaap	Derivative Assets DerivativeAssets	6200000	USD
CY2016Q3	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	11400000	USD
CY2017Q3	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	5900000	USD
CY2016Q3	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	1900000	USD
CY2017Q3	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	300000	USD
CY2016Q3	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	18400000	USD
CY2017Q3	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	13000000	USD
CY2016Q3	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	12500000	USD
CY2017Q3	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	13300000	USD
CY2015	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	2800000	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
CY2016Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	4900000	USD
CY2017Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	8000000	USD
CY2016Q3	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	4800000	USD
CY2017Q3	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	4900000	USD
CY2016Q3	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	100000	USD
CY2017Q3	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	3100000	USD
CY2016Q3	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	7600000	USD
CY2017Q3	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	5300000	USD
CY2015	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	80200000	USD
CY2016	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	87500000	USD
CY2017	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	99200000	USD
CY2016Q3	us-gaap	Dividends Payable Current DividendsPayableCurrent	23500000	USD
CY2017Q3	us-gaap	Dividends Payable Current DividendsPayableCurrent	26600000	USD
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.16
CY2015Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.08
CY2016Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.32
CY2016Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.24
CY2016Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.31
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.26
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
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.16
CY2015Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.08
CY2016Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.31
CY2016Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.24
CY2016Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.31
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
CY2015	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.312
CY2016	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.325
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.324
CY2015	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
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
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depreciation And Amortization EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciationAndAmortization	-0.037
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
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.025
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
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Prior Year Income Taxes EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes	-0.006
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
CY2015	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.030
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
CY2016Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	39800000	USD
CY2017Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	38700000	USD
CY2015	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	1800000	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
CY2017Q3	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	8900000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y9M18D
CY2015	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1900000	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
CY2016Q3	us-gaap	Energy Related Inventory Gas Stored Underground EnergyRelatedInventoryGasStoredUnderground	174000000	USD
CY2017Q3	us-gaap	Energy Related Inventory Gas Stored Underground EnergyRelatedInventoryGasStoredUnderground	194900000	USD
CY2016Q3	us-gaap	Energy Related Inventory Propane Gas EnergyRelatedInventoryPropaneGas	12000000	USD
CY2017Q3	us-gaap	Energy Related Inventory Propane Gas EnergyRelatedInventoryPropaneGas	12000000	USD
CY2015	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	7600000	USD
CY2016	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	0	USD
CY2017	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	0	USD
CY2014Q3	us-gaap	Goodwill Goodwill	937800000	USD
CY2015Q3	us-gaap	Goodwill Goodwill	946000000	USD
CY2016Q3	us-gaap	Goodwill Goodwill	1164900000	USD
CY2017Q3	us-gaap	Goodwill Goodwill	1171600000	USD
CY2016	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	12300000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	63000000	USD
CY2015	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	-17000000	USD
CY2016	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	-400000	USD
CY2016	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	218900000	USD
CY2015	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	8200000	USD
CY2017	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	6700000	USD
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	199100000	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
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	62200000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	69500000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	77600000	USD
CY2015	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	200000	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
CY2015	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	1300000	USD
CY2016	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2900000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-1300000	USD
CY2015	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-30000000	USD
CY2016	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	30000000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	51100000	USD
CY2015	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	4800000	USD
CY2017	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	5800000	USD
CY2015	us-gaap	Increase Decrease In Deferred Gas Cost IncreaseDecreaseInDeferredGasCost	-27100000	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
CY2015	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-54800000	USD
CY2016	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-16500000	USD
CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	23500000	USD
CY2015	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	67600000	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
CY2015	us-gaap	Increase Decrease In Unbilled Receivables IncreaseDecreaseInUnbilledReceivables	-20300000	USD
CY2016	us-gaap	Increase Decrease In Unbilled Receivables IncreaseDecreaseInUnbilledReceivables	-26900000	USD
CY2017	us-gaap	Increase Decrease In Unbilled Receivables IncreaseDecreaseInUnbilledReceivables	40000000	USD
CY2015	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	100000	shares
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
CY2015	us-gaap	Interest Expense InterestExpense	74600000	USD
CY2016	us-gaap	Interest Expense InterestExpense	77200000	USD
CY2017	us-gaap	Interest Expense InterestExpense	89100000	USD
CY2015	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	66600000	USD
CY2016	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	67600000	USD
CY2017	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	76800000	USD
CY2015	us-gaap	Interest Expense Other InterestExpenseOther	8000000	USD
CY2016	us-gaap	Interest Expense Other InterestExpenseOther	9600000	USD
CY2017	us-gaap	Interest Expense Other InterestExpenseOther	12300000	USD
CY2015	us-gaap	Interest Paid Net InterestPaidNet	65300000	USD
CY2016	us-gaap	Interest Paid Net InterestPaidNet	72500000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	85500000	USD
CY2016Q3	us-gaap	Interest Payable Current InterestPayableCurrent	14800000	USD
CY2017Q3	us-gaap	Interest Payable Current InterestPayableCurrent	14600000	USD
CY2015	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	14100000	USD
CY2016	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	11900000	USD
CY2017	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	9700000	USD
CY2016Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6064400000	USD
CY2017Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6546700000	USD
CY2016Q3	us-gaap	Liabilities Current LiabilitiesCurrent	1161300000	USD
CY2017Q3	us-gaap	Liabilities Current LiabilitiesCurrent	1097900000	USD
CY2016Q3	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	1314200000	USD
CY2017Q3	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	1462500000	USD
CY2017Q3	us-gaap	Line Of Credit LineOfCredit	477300000	USD
CY2016	us-gaap	Line Of Credit Facility Average Outstanding Amount LineOfCreditFacilityAverageOutstandingAmount	273900000	USD
CY2017	us-gaap	Line Of Credit Facility Average Outstanding Amount LineOfCreditFacilityAverageOutstandingAmount	485800000	USD
CY2017Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	100000000	USD
CY2017Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	50000000	USD
CY2017Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	55000000	USD
CY2017Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	40000000	USD
CY2017Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	180000000	USD
CY2016Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1820700000	USD
CY2017Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1995000000	USD
CY2017	us-gaap	Long Term Purchase Commitment Amount LongTermPurchaseCommitmentAmount	1281800000	USD
CY2017Q3	us-gaap	Mortgage Loans On Real Estate Carrying Amount Of Mortgages MortgageLoansOnRealEstateCarryingAmountOfMortgages	1300000	USD
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-26000000	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
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-298700000	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
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	322400000	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
CY2015	us-gaap	Net Income Loss NetIncomeLoss	136900000	USD
CY2015Q4	us-gaap	Net Income Loss NetIncomeLoss	46900000	USD
CY2016Q1	us-gaap	Net Income Loss NetIncomeLoss	100800000	USD
CY2016Q2	us-gaap	Net Income Loss NetIncomeLoss	10700000	USD
CY2016Q3	us-gaap	Net Income Loss NetIncomeLoss	-14200000	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
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	136400000	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
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	136400000	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
CY2015	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	1200000	USD
CY2016	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	8600000	USD
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	6600000	USD
CY2016Q3	us-gaap	Notes Payable Current NotesPayableCurrent	398700000	USD
CY2017Q3	us-gaap	Notes Payable Current NotesPayableCurrent	477300000	USD
CY2016Q3	us-gaap	Notes Receivable Net NotesReceivableNet	11800000	USD
CY2017Q3	us-gaap	Notes Receivable Net NotesReceivableNet	12500000	USD
CY2017	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	operating_segment
CY2015	us-gaap	Operating Income Loss OperatingIncomeLoss	272500000	USD
CY2015Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	87000000	USD
CY2016Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	167700000	USD
CY2016Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	35300000	USD
CY2016Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	-7700000	USD
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
CY2017Q3	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	83700000	USD
CY2017Q3	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	10100000	USD
CY2017Q3	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	6000000	USD
CY2017Q3	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	6100000	USD
CY2017Q3	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	7800000	USD
CY2017Q3	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	9300000	USD
CY2017Q3	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	44400000	USD
CY2017Q3	us-gaap	Operating Leases Future Minimum Payments Receivable Current OperatingLeasesFutureMinimumPaymentsReceivableCurrent	2100000	USD
CY2017Q3	us-gaap	Operating Leases Future Minimum Payments Receivable In Four Years OperatingLeasesFutureMinimumPaymentsReceivableInFourYears	500000	USD
CY2017Q3	us-gaap	Operating Leases Future Minimum Payments Receivable In Three Years OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears	2100000	USD
CY2017Q3	us-gaap	Operating Leases Future Minimum Payments Receivable In Two Years OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears	2100000	USD
CY2015	us-gaap	Operating Leases Rent Expense Sublease Rentals1 OperatingLeasesRentExpenseSubleaseRentals1	200000	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
CY2017Q3	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	478600000	USD
CY2016Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	128900000	USD
CY2017Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	77100000	USD
CY2015	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	-500000	USD
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	-400000	USD
CY2016	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	300000	USD
CY2015	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	700000	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
CY2015	us-gaap	Payments Of Dividends PaymentsOfDividends	79000000	USD
CY2016	us-gaap	Payments Of Dividends PaymentsOfDividends	85200000	USD
CY2017	us-gaap	Payments Of Dividends PaymentsOfDividends	96200000	USD
CY2015	us-gaap	Payments To Acquire Business Two Net Of Cash Acquired PaymentsToAcquireBusinessTwoNetOfCashAcquired	8200000	USD
CY2015	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesBeforeTaxPortionAttributableToParent	-1100000	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
CY2015	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	-600000	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
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-300000	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
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	100000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	0	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	-4400000	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
CY2015	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 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
CY2015	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-300000	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
CY2015	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	-5500000	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
CY2015	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	0	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
CY2016Q3	us-gaap	Other Inventory Purchased Goods OtherInventoryPurchasedGoods	16300000	USD
CY2017Q3	us-gaap	Other Inventory Purchased Goods OtherInventoryPurchasedGoods	18900000	USD
CY2016Q3	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	32700000	USD
CY2017Q3	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	33100000	USD
CY2016Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	66100000	USD
CY2017Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	63800000	USD
CY2015	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	6400000	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
CY2016Q3	us-gaap	Other Receivables From Broker Dealers And Clearing Organizations OtherReceivablesFromBrokerDealersAndClearingOrganizations	2900000	USD
CY2017Q3	us-gaap	Other Receivables From Broker Dealers And Clearing Organizations OtherReceivablesFromBrokerDealersAndClearingOrganizations	4000000	USD
CY2015	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	500000	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
CY2015	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Diluted ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted	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
CY2016Q3	us-gaap	Payables To Broker Dealers And Clearing Organizations PayablesToBrokerDealersAndClearingOrganizations	-2500000	USD
CY2017Q3	us-gaap	Payables To Broker Dealers And Clearing Organizations PayablesToBrokerDealersAndClearingOrganizations	1500000	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
CY2015	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	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
CY2015	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	289800000	USD
CY2016	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	293300000	USD
CY2017	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	438100000	USD
CY2015	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	289800000	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
CY2016Q3	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	303700000	USD
CY2017Q3	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	237400000	USD
CY2016Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2017Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2016Q3	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2015	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	1976400000	USD
CY2015Q4	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	399400000	USD
CY2016Q1	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	609300000	USD
CY2016Q2	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	249300000	USD
CY2016Q3	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	279300000	USD
CY2017Q3	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2016Q3	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2017Q3	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2016Q3	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	24800000	USD
CY2017Q3	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	34200000	USD
CY2015	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	3100000	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
CY2015	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	35000000	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
CY2015	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1100000	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
CY2015	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	50800000	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
CY2016Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	13700000	USD
CY2017Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	52000000	USD
CY2016Q3	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	1506400000	USD
CY2017Q3	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	1613200000	USD
CY2016Q3	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	3287200000	USD
CY2017Q3	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	3665200000	USD
CY2016Q3	us-gaap	Public Utilities Property Plant And Equipment Transmission And Distribution PublicUtilitiesPropertyPlantAndEquipmentTransmissionAndDistribution	4793600000	USD
CY2017Q3	us-gaap	Public Utilities Property Plant And Equipment Transmission And Distribution PublicUtilitiesPropertyPlantAndEquipmentTransmissionAndDistribution	5278400000	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
CY2015	us-gaap	Regulated Operating Revenue Gas RegulatedOperatingRevenueGas	1891800000	USD
CY2016	us-gaap	Regulated Operating Revenue Gas RegulatedOperatingRevenueGas	1457200000	USD
CY2017	us-gaap	Regulated Operating Revenue Gas RegulatedOperatingRevenueGas	1660000000	USD
CY2016Q3	us-gaap	Regulatory Assets RegulatoryAssets	931900000	USD
CY2017Q3	us-gaap	Regulatory Assets RegulatoryAssets	966600000	USD
CY2016Q3	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	93900000	USD
CY2017Q3	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	175500000	USD
CY2016Q3	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	838000000	USD
CY2017Q3	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	791100000	USD
CY2016Q3	us-gaap	Regulatory Liabilities RegulatoryLiabilities	161300000	USD
CY2017Q3	us-gaap	Regulatory Liabilities RegulatoryLiabilities	179800000	USD
CY2016Q3	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	30600000	USD
CY2017Q3	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	22600000	USD
CY2016Q3	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	130700000	USD
CY2017Q3	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	157200000	USD
CY2016Q3	us-gaap	Remaining Amounts Of Regulatory Assets For Which No Return On Investment During Recovery Period Is Provided RemainingAmountsOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided	404800000	USD
CY2017Q3	us-gaap	Remaining Amounts Of Regulatory Assets For Which No Return On Investment During Recovery Period Is Provided RemainingAmountsOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided	380300000	USD
CY2015	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	34800000	USD
CY2016	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	80000000	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	393800000	USD
CY2017Q2	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	142000000	USD
CY2016Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	550900000	USD
CY2017Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	614200000	USD
CY2016Q3	us-gaap	Retained Earnings Unappropriated RetainedEarningsUnappropriated	916800000	USD
CY2017Q3	us-gaap	Retained Earnings Unappropriated RetainedEarningsUnappropriated	1010800000	USD
CY2017Q2	us-gaap	Sale Of Stock Number Of Shares Issued In Transaction SaleOfStockNumberOfSharesIssuedInTransaction	2500000	shares
CY2017Q2	us-gaap	Sale Of Stock Number Of Shares Issued In Transaction SaleOfStockNumberOfSharesIssuedInTransaction	2504684	shares
CY2017Q2	us-gaap	Sale Of Stock Price Per Share SaleOfStockPricePerShare	57.3921
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1	P3Y
CY2015	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 Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.140
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
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0083
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
CY2017Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	1000000	shares
CY2015	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P2Y9M18D
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
CY2016Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	398700000	USD
CY2017Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	477300000	USD
CY2016Q3	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.011
CY2017Q3	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.015
CY2016	us-gaap	Shortterm Debt Maximum Amount Outstanding During Period ShorttermDebtMaximumAmountOutstandingDuringPeriod	427200000	USD
CY2017	us-gaap	Shortterm Debt Maximum Amount Outstanding During Period ShorttermDebtMaximumAmountOutstandingDuringPeriod	675600000	USD
CY2016Q2	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	2185000	shares
CY2015	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	1600000	USD
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
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
CY2015	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	1400000	USD
CY2016	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	500000	USD
CY2017	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	100000	USD
CY2015	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	6700000	USD
CY2015	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	84600000	USD
CY2016	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	80100000	USD
CY2017	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	80700000	USD
CY2015	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	1545000000	USD
CY2016	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	6700000	USD
CY2014Q3	us-gaap	Stockholders Equity StockholdersEquity	1508400000	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
CY2014	us-gaap	Subordinated Borrowing Interest Rate SubordinatedBorrowingInterestRate	0.02
CY2017Q3	us-gaap	Tax Credit Carryforward Amount TaxCreditCarryforwardAmount	2500000	USD
CY2016Q3	us-gaap	Taxes Payable Current TaxesPayableCurrent	55200000	USD
CY2017Q3	us-gaap	Taxes Payable Current TaxesPayableCurrent	61000000	USD
CY2016Q3	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	13000000	USD
CY2017Q3	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	15200000	USD
CY2016Q3	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	1600000	USD
CY2017Q3	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	3400000	USD
CY2014Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4600000	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
CY2017Q3	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued	0	USD
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2900000	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
CY2016Q3	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	0	USD
CY2017Q3	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	0	USD
CY2015	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	400000	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
CY2016Q3	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	3300000	USD
CY2017Q3	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	5100000	USD
CY2016	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	1131800000	USD
CY2017	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	1266800000	USD
CY2015	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	129900000	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
CY2015	us-gaap	Utilities Operating Expense Gas And Petroleum Purchased UtilitiesOperatingExpenseGasAndPetroleumPurchased	882400000	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
CY2015	us-gaap	Utilities Operating Expense Maintenance Operations And Other Costs And Expenses UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses	390600000	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
CY2015	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	142100000	USD
CY2016	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	125200000	USD
CY2017	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	137800000	USD
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	43300000	shares
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
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	43200000	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
CY2017	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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0001126956-17-000063-index.html	Edgar Link	pending
0001126956-17-000063.txt	Edgar Link	pending
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al20170930-ex233.htm	Edgar Link	pending
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$SR
SPIRE INC Stock $sr

2016 Q3 Form 10-K Financial Statement

#000112695617000063 Filed on November 15, 2017

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SR SPIRE INC Stock $sr

2016 Q3 Form 10-K Financial Statement

#000112695617000063 Filed on November 15, 2017

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SR
SPIRE INC Stock $sr