$ALE
ALLETE INC Stock $ale

$ale Overview Financials Valuation SEC Filings Company Website

2014 Q4 Form 10-K Financial Statement

#000006675616000169 Filed on February 22, 2016

Income Statement

Concept	2014 Q4	2014 Q3	2014 Q2
Revenue	$290.7M	$288.9M	$260.7M
YoY Change	8.47%	15.1%	10.65%
Cost Of Revenue		$16.80M	$18.90M
YoY Change
Gross Profit		$272.1M	$241.8M
YoY Change
Gross Profit Margin		94.18%	92.75%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$36.10M	$33.40M	$33.90M
YoY Change	18.36%	10.6%	18.12%
% of Gross Profit		12.27%	14.02%
Operating Expenses	$239.2M	$65.70M	$74.30M
YoY Change	8.19%	-36.03%	-64.82%
Operating Profit	$51.50M	$60.80M	$28.20M
YoY Change	9.81%	58.33%	15.57%
Interest Expense	-$10.60M	$13.20M	$13.50M
YoY Change	58.21%	3.94%	5.47%
% of Operating Profit	-20.58%	21.71%	47.87%
Other Income/Expense, Net	$1.900M	-$5.800M	-$6.400M
YoY Change	58.33%	28.89%	1.59%
Pretax Income	$42.80M	$55.00M	$21.80M
YoY Change	3.38%	62.24%	20.44%
Income Tax	$9.600M	$13.40M	$4.900M
% Of Pretax Income	22.43%	24.36%	22.48%
Net Earnings	$32.90M	$41.60M	$16.80M
YoY Change	-0.3%	65.08%	20.0%
Net Earnings / Revenue	11.32%	14.4%	6.44%
Basic Earnings Per Share	$0.73	$0.97	$0.40
Diluted Earnings Per Share	$0.73	$0.97	$0.40
COMMON SHARES
Basic Shares Outstanding		42.90M shares	42.10M shares
Diluted Shares Outstanding		42.90M shares	42.30M shares

Balance Sheet

Concept	2014 Q4	2014 Q3	2014 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$145.8M	$150.5M	$83.60M
YoY Change	49.85%	-8.51%	-42.34%
Cash & Equivalents	$145.8M	$150.5M	$83.60M
Short-Term Investments
Other Short-Term Assets	$82.00M	$29.30M	$8.600M
YoY Change	133.62%	357.81%	8.86%
Inventory	$80.50M	$71.60M	$75.30M
Prepaid Expenses
Receivables	$103.0M	$82.40M	$78.90M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$418.8M	$357.8M	$293.5M
YoY Change	36.42%	-3.04%	-8.54%
LONG-TERM ASSETS
Property, Plant & Equipment	$3.285B	$3.122B	$3.020B
YoY Change	27.49%	27.09%	26.0%
Goodwill	$2.900M
YoY Change
Intangibles	$1.900M
YoY Change
Long-Term Investments	$121.1M	$120.7M	$118.8M
YoY Change	5.67%	7.1%	6.83%
Other Assets	$59.60M	$74.40M	$75.40M
YoY Change	-13.12%	73.43%	71.75%
Total Long-Term Assets	$3.942B	$3.710B	$3.602B
YoY Change	24.36%	19.88%	18.88%
TOTAL ASSETS
Total Short-Term Assets	$418.8M	$357.8M	$293.5M
Total Long-Term Assets	$3.942B	$3.710B	$3.602B
Total Assets	$4.361B	$4.068B	$3.896B
YoY Change	25.43%	17.44%	16.26%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$134.1M	$92.70M	$93.20M
YoY Change	34.23%	9.96%	78.89%
Accrued Expenses	$18.00M	$14.80M	$17.40M
YoY Change	14.65%	-0.67%	9.43%
Deferred Revenue
YoY Change
Short-Term Debt	$3.700M	$2.700M	$0.00
YoY Change		125.0%
Long-Term Debt Due	$100.7M	$85.30M	$10.80M
YoY Change	270.22%	126.26%	-71.5%
Total Short-Term Liabilities	$416.0M	$286.8M	$213.4M
YoY Change	80.71%	28.32%	10.51%
LONG-TERM LIABILITIES
Long-Term Debt	$1.273B	$1.289B	$1.317B
YoY Change	17.53%	21.14%	23.68%
Other Long-Term Liabilities	$265.0M	$231.6M	$234.5M
YoY Change	108.33%	79.4%	81.36%
Total Long-Term Liabilities	$1.538B	$1.521B	$1.551B
YoY Change	27.07%	27.44%	29.92%
TOTAL LIABILITIES
Total Short-Term Liabilities	$416.0M	$286.8M	$213.4M
Total Long-Term Liabilities	$1.538B	$1.521B	$1.551B
Total Liabilities	$2.750B	$2.537B	$2.478B
YoY Change	28.85%	16.58%	17.9%
SHAREHOLDERS EQUITY
Retained Earnings	$530.1M	$518.6M	$497.7M
YoY Change	8.38%	9.39%	6.37%
Common Stock	$1.108B	$1.035B	$945.1M
YoY Change	25.12%	21.83%	15.35%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.609B	$1.529B	$1.416B
YoY Change
Total Liabilities & Shareholders Equity	$4.361B	$4.068B	$3.896B
YoY Change	25.43%	17.44%	16.26%

Cashflow Statement

Concept	2014 Q4	2014 Q3	2014 Q2
OPERATING ACTIVITIES
Net Income	$32.90M	$41.60M	$16.80M
YoY Change	-0.3%	65.08%	20.0%
Depreciation, Depletion And Amortization	$36.10M	$33.40M	$33.90M
YoY Change	18.36%	10.6%	18.12%
Cash From Operating Activities	$57.70M	$86.00M	$51.20M
YoY Change	14.26%	10.54%	-3.21%
INVESTING ACTIVITIES
Capital Expenditures	-$105.0M	-$133.9M	-$117.7M
YoY Change	-21.17%	100.75%	100.17%
Acquisitions
YoY Change
Other Investing Activities	-$62.20M	-$1.200M	-$1.100M
YoY Change	640.48%	-61.29%	-56.0%
Cash From Investing Activities	-$167.2M	-$135.1M	-$118.8M
YoY Change	18.08%	93.55%	93.8%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	104.8M	116.0M	106.6M
YoY Change	338.49%	908.7%	40.08%
NET CHANGE
Cash From Operating Activities	57.70M	86.00M	51.20M
Cash From Investing Activities	-167.2M	-135.1M	-118.8M
Cash From Financing Activities	104.8M	116.0M	106.6M
Net Change In Cash	-4.700M	66.90M	39.00M
YoY Change	-93.01%	243.08%	-42.39%
FREE CASH FLOW
Cash From Operating Activities	$57.70M	$86.00M	$51.20M
Capital Expenditures	-$105.0M	-$133.9M	-$117.7M
Free Cash Flow	$162.7M	$219.9M	$168.9M
YoY Change	-11.43%	52.18%	51.21%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2015	ale	Finite Lived Intangible Assets Other Changes FiniteLivedIntangibleAssetsOtherChanges	300000	USD
CY2015	ale	Intangible Assets Acquired IntangibleAssetsAcquired	87000000	USD
CY2013	ale	Amortizationof Power Purchase Agreements AmortizationofPowerPurchaseAgreements	0	USD
CY2014	ale	Amortizationof Power Purchase Agreements AmortizationofPowerPurchaseAgreements	12700000	USD
CY2015	ale	Amortizationof Power Purchase Agreements AmortizationofPowerPurchaseAgreements	23200000	USD
CY2015Q4	ale	Availableforsale Securities Debt Maturities After Five Years Fair Value AvailableforsaleSecuritiesDebtMaturitiesAfterFiveYearsFairValue	6700000	USD
CY2015Q4	ale	Availableforsale Securities Debt Maturities After One Year Through Three Years Fair Value AvailableforsaleSecuritiesDebtMaturitiesAfterOneYearThroughThreeYearsFairValue	1000000	USD
CY2015Q4	ale	Availableforsale Securities Debt Maturities After Three Years Through Five Years Fair Value AvailableforsaleSecuritiesDebtMaturitiesAfterThreeYearsThroughFiveYearsFairValue	3200000	USD
CY2015Q4	ale	Debt Instrument Actual Indebtedness To Total Capital Ratio DebtInstrumentActualIndebtednessToTotalCapitalRatio	0.47
CY2015Q4	ale	Debt Instrument Required Indebtedness To Total Capital Ratio DebtInstrumentRequiredIndebtednessToTotalCapitalRatio	0.65
CY2015	ale	Decreasein Accounts Payablefor Capital Additionsto Property Plantand Equipment DecreaseinAccountsPayableforCapitalAdditionstoPropertyPlantandEquipment	40600000	USD
CY2014Q4	ale	Deferred Tax Liabilty Partnership Basis Differences DeferredTaxLiabiltyPartnershipBasisDifferences	41900000	USD
CY2015Q4	ale	Deferred Tax Liabilty Partnership Basis Differences DeferredTaxLiabiltyPartnershipBasisDifferences	47800000	USD
CY2013	ale	Defined Contribution Plan Employer Matching Contribution Amount DefinedContributionPlanEmployerMatchingContributionAmount	8400000	USD
CY2014	ale	Defined Contribution Plan Employer Matching Contribution Amount DefinedContributionPlanEmployerMatchingContributionAmount	9100000	USD
CY2015	ale	Defined Contribution Plan Employer Matching Contribution Amount DefinedContributionPlanEmployerMatchingContributionAmount	9000000	USD
CY2013	ale	Effective Income Tax Rate Reconciliation Regulatory Differences EffectiveIncomeTaxRateReconciliationRegulatoryDifferences	-2200000	USD
CY2014	ale	Effective Income Tax Rate Reconciliation Regulatory Differences EffectiveIncomeTaxRateReconciliationRegulatoryDifferences	-3500000	USD
CY2015	ale	Effective Income Tax Rate Reconciliation Regulatory Differences EffectiveIncomeTaxRateReconciliationRegulatoryDifferences	-600000	USD
CY2015	ale	Intangible Assets Other Changes IntangibleAssetsOtherChanges	300000	USD
CY2014Q4	ale	Investments Cash And Cash Equivalents Fair Value Disclosure InvestmentsCashAndCashEquivalentsFairValueDisclosure	2900000	USD
CY2015Q4	ale	Investments Cash And Cash Equivalents Fair Value Disclosure InvestmentsCashAndCashEquivalentsFairValueDisclosure	2000000	USD
CY2015	ale	Morelikelythannotdefined Morelikelythannotdefined	0.50
CY2014Q4	ale	Power Purchase Agreement Current Liability PowerPurchaseAgreementCurrentLiability	19400000	USD
CY2015Q4	ale	Power Purchase Agreement Current Liability PowerPurchaseAgreementCurrentLiability	23300000	USD
CY2014Q4	ale	Power Purchase Agreement Noncurrent Liability PowerPurchaseAgreementNoncurrentLiability	110700000	USD
CY2015Q4	ale	Power Purchase Agreement Noncurrent Liability PowerPurchaseAgreementNoncurrentLiability	138100000	USD
CY2014Q4	ale	Power Purchase Agreements Deferred Tax Asset PowerPurchaseAgreementsDeferredTaxAsset	51800000	USD
CY2015Q4	ale	Power Purchase Agreements Deferred Tax Asset PowerPurchaseAgreementsDeferredTaxAsset	73000000	USD
CY2013	ale	Unrecognized Tax Benefits Intereston Income Taxes Expense Description UnrecognizedTaxBenefitsInterestonIncomeTaxesExpenseDescription	immaterial
CY2014	ale	Unrecognized Tax Benefits Intereston Income Taxes Expense Description UnrecognizedTaxBenefitsInterestonIncomeTaxesExpenseDescription	immaterial
CY2015	ale	Unrecognized Tax Benefits Intereston Income Taxes Expense Description UnrecognizedTaxBenefitsInterestonIncomeTaxesExpenseDescription	immaterial
CY2015	dei	Amendment Flag AmendmentFlag	false
CY2015	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2015	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2015	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2015
CY2015	dei	Document Period End Date DocumentPeriodEndDate	2015-12-31
CY2015	dei	Document Type DocumentType	10-K
CY2015	dei	Entity Central Index Key EntityCentralIndexKey	0000066756
CY2016Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	49111849	shares
CY2015	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2015Q2	dei	Entity Public Float EntityPublicFloat	2256186129	USD
CY2015	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2015	dei	Entity Registrant Name EntityRegistrantName	ALLETE INC
CY2015	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2015	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2014Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	134100000	USD
CY2015Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	88800000	USD
CY2014Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	85500000	USD
CY2015Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	105300000	USD
CY2014Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	103000000	USD
CY2015Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	121200000	USD
CY2014Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	10300000	USD
CY2015Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	26000000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-22000000	USD
CY2013Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-17100000	USD
CY2014Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-21100000	USD
CY2015Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-24500000	USD
CY2013	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2400000	USD
CY2014	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2300000	USD
CY2015	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2600000	USD
CY2014Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1100000	USD
CY2015Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1000000	USD
CY2015	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4000000	USD
CY2013Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	81800000	USD
CY2014Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	109200000	USD
CY2015Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	131400000	USD
CY2014	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	5500000	USD
CY2015	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	7300000	USD
CY2014	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	23000000	USD
CY2015	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	5100000	USD
CY2014	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	500000	USD
CY2015	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	2600000	USD
CY2014	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-600000	USD
CY2015	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	12400000	USD
CY2014Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	109200000	USD
CY2015Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	131400000	USD
CY2014Q4	us-gaap	Assets Assets	4360800000	USD
CY2015Q4	us-gaap	Assets Assets	4907100000	USD
CY2014Q4	us-gaap	Assets Current AssetsCurrent	418800000	USD
CY2015Q4	us-gaap	Assets Current AssetsCurrent	371000000	USD
CY2013Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	0	USD
CY2014Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	200000	USD
CY2015Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	0	USD
CY2013Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	600000	USD
CY2014Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	900000	USD
CY2015Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	1500000	USD
CY2013Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	18300000	USD
CY2014Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	19600000	USD
CY2015Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	20000000	USD
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	0	USD
CY2013	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	2200000	USD
CY2014	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	200000	USD
CY2015	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	100000	USD
CY2013	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	16100000	USD
CY2014	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	3600000	USD
CY2015	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	1700000	USD
CY2013	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	0	USD
CY2014	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	0	USD
CY2015	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	0	USD
CY2013Q4	us-gaap	Available For Sale Securities Noncurrent AvailableForSaleSecuritiesNoncurrent	17700000	USD
CY2014Q4	us-gaap	Available For Sale Securities Noncurrent AvailableForSaleSecuritiesNoncurrent	18900000	USD
CY2015Q4	us-gaap	Available For Sale Securities Noncurrent AvailableForSaleSecuritiesNoncurrent	18500000	USD
CY2014	us-gaap	Business Acquisition Pro Forma Information Description BusinessAcquisitionProFormaInformationDescription	not significant
CY2015	us-gaap	Business Acquisition Pro Forma Information Description BusinessAcquisitionProFormaInformationDescription	not significant
CY2014Q4	us-gaap	Business Combination Contingent Consideration Liability Noncurrent BusinessCombinationContingentConsiderationLiabilityNoncurrent	0	USD
CY2015Q4	us-gaap	Business Combination Contingent Consideration Liability Noncurrent BusinessCombinationContingentConsiderationLiabilityNoncurrent	36600000	USD
CY2014	us-gaap	Business Combination Reason For Business Combination BusinessCombinationReasonForBusinessCombination	The acquisitions below are consistent with ALLETE’s stated strategy of investing in energy infrastructure and related services businesses to complement its core regulated utility, balance exposure to business cycles and changing demand, and provide potential long-term earnings growth.
CY2015	us-gaap	Business Combination Reason For Business Combination BusinessCombinationReasonForBusinessCombination	The acquisitions below are consistent with ALLETE’s stated strategy of investing in energy infrastructure and related services businesses to complement its core regulated utility, balance exposure to business cycles and changing demand, and provide potential long-term earnings growth.
CY2013	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	8300000	USD
CY2014	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	21700000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	80800000	USD
CY2013Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	97300000	USD
CY2014Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	145800000	USD
CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	97000000	USD
CY2013	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	16500000	USD
CY2014	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	48500000	USD
CY2015	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-48800000	USD
CY2014Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2015Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2013	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.90
CY2014	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.96
CY2015	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.02
CY2014Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0.00
CY2015Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0.00
CY2014Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	80000000	shares
CY2015Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	80000000	shares
CY2014Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	45900000	shares
CY2015Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	49100000	shares
CY2013	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	109600000	USD
CY2014	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	120800000	USD
CY2014Q4	us-gaap	Common Stock Value CommonStockValue	1107600000	USD
CY2015Q4	us-gaap	Common Stock Value CommonStockValue	1271400000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	137700000	USD
CY2013	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	USD
CY2014	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	700000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	400000	USD
CY2013	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	109600000	USD
CY2014	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	121500000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	138100000	USD
CY2014Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	48200000	USD
CY2015Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	0	USD
CY2013	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	71200000	USD
CY2014	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	77900000	USD
CY2015	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	302300000	USD
CY2013	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	334800000	USD
CY2014	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	356100000	USD
CY2015	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	328100000	USD
CY2013	us-gaap	Cost Of Transmission CostOfTransmission	32300000	USD
CY2014	us-gaap	Cost Of Transmission CostOfTransmission	45600000	USD
CY2015	us-gaap	Cost Of Transmission CostOfTransmission	54100000	USD
CY2013	us-gaap	Costs And Expenses CostsAndExpenses	864300000	USD
CY2014	us-gaap	Costs And Expenses CostsAndExpenses	948000000	USD
CY2015	us-gaap	Costs And Expenses CostsAndExpenses	1275700000	USD
CY2013	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2014	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	1100000	USD
CY2015	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2013	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	100000	USD
CY2014	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	4000000	USD
CY2015	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	200000	USD
CY2013	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	100000	USD
CY2014	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2900000	USD
CY2015	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	200000	USD
CY2014Q4	us-gaap	Customer Advances Current CustomerAdvancesCurrent	54300000	USD
CY2015Q4	us-gaap	Customer Advances Current CustomerAdvancesCurrent	0	USD
CY2014Q4	us-gaap	Customer Deposits Current CustomerDepositsCurrent	19700000	USD
CY2015Q4	us-gaap	Customer Deposits Current CustomerDepositsCurrent	15100000	USD
CY2015Q4	us-gaap	Customer Refund Liability Current CustomerRefundLiabilityCurrent	7000000	USD
CY2014Q4	us-gaap	Debt Current DebtCurrent	104400000	USD
CY2015Q4	us-gaap	Debt Current DebtCurrent	37900000	USD
CY2015	us-gaap	Debt Instrument Covenant Compliance DebtInstrumentCovenantCompliance	ALLETE was in compliance with its financial covenants.
CY2013	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	22900000	USD
CY2014	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	25300000	USD
CY2015	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	19400000	USD
CY2014Q4	us-gaap	Deferred Fuel Cost DeferredFuelCost	16300000	USD
CY2015Q4	us-gaap	Deferred Fuel Cost DeferredFuelCost	10600000	USD
CY2013	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	28600000	USD
CY2014	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	32700000	USD
CY2015	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	25100000	USD
CY2014Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	1007000000	USD
CY2015Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	1226200000	USD
CY2013	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-800000	USD
CY2014	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-800000	USD
CY2015	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-800000	USD
CY2013	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	6500000	USD
CY2014	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	8200000	USD
CY2015	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	6500000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	525900000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	678000000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Gross Current DeferredTaxAssetsGrossCurrent	39400000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	7500000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	0	USD
CY2014Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	503800000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	646400000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	7500000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	0	USD
CY2014Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	156500000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	186400000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	17000000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	21800000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	102700000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	126600000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	95700000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	164800000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	102200000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	105400000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	22100000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	31600000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	503200000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	579800000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	510700000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	579800000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	16100000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	10000000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	848800000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1053000000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssets	89900000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssets	89400000	USD
CY2013	us-gaap	Depreciation Depreciation	116600000	USD
CY2014	us-gaap	Depreciation Depreciation	135700000	USD
CY2015	us-gaap	Depreciation Depreciation	165900000	USD
CY2013	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	116600000	USD
CY2014	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	135700000	USD
CY2015	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	170000000	USD
CY2015	us-gaap	Description Of Effect On Previously Reported Segment Information For Change In Composition Of Reportable Segments DescriptionOfEffectOnPreviouslyReportedSegmentInformationForChangeInCompositionOfReportableSegments	During the year ended December 31, 2015, management updated our reportable segment presentation to reflect the manner in which we operate, assess, and allocate resources after our recent acquisitions. We now present three reportable segments, Regulated Operations, ALLETE Clean Energy, and U.S. Water Services. Prior period amounts have been revised to conform with the current business segment presentation.
CY2013	us-gaap	Dividends Common Stock DividendsCommonStock	75200000	USD
CY2014	us-gaap	Dividends Common Stock DividendsCommonStock	83800000	USD
CY2015	us-gaap	Dividends Common Stock DividendsCommonStock	97900000	USD
CY2013	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.64
CY2014Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.81
CY2014Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.40
CY2014Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.97
CY2014Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.73
CY2014	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.91
CY2015Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.85
CY2015Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.46
CY2015Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.24
CY2015Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.37
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.92
CY2013	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.63
CY2014Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.80
CY2014Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.40
CY2014Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.97
CY2014Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.73
CY2014	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.90
CY2015Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.85
CY2015Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.46
CY2015Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.23
CY2015Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.37
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.92
CY2013	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.215
CY2014	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.226
CY2015	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.152
CY2013	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2014	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2015	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2013	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	0	USD
CY2014	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	0	USD
CY2015	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	0	USD
CY2013	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1000000	USD
CY2014	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1000000	USD
CY2015	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1100000	USD
CY2013	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	8400000	USD
CY2014	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	9100000	USD
CY2015	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	9000000	USD
CY2015	us-gaap	Employee Stock Ownership Plan Esop Debt Structure Employer Loan Description EmployeeStockOwnershipPlanESOPDebtStructureEmployerLoanDescription	In 1990, the ESOP issued a $75.0 million note (term not to exceed 25 years at 10.25 percent) to use as consideration for 2.8 million shares (1.9 million shares adjusted for stock splits) of our newly issued common stock. The note was refinanced in 2006 at 6 percent and subsequently matured in December 2015.
CY2013Q4	us-gaap	Employee Stock Ownership Plan Esop Deferred Shares Fair Value EmployeeStockOwnershipPlanESOPDeferredSharesFairValue	24100000	USD
CY2014Q4	us-gaap	Employee Stock Ownership Plan Esop Deferred Shares Fair Value EmployeeStockOwnershipPlanESOPDeferredSharesFairValue	13200000	USD
CY2015Q4	us-gaap	Employee Stock Ownership Plan Esop Deferred Shares Fair Value EmployeeStockOwnershipPlanESOPDeferredSharesFairValue	0	USD
CY2013Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	2000000	shares
CY2014Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	1900000	shares
CY2015Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	1800000	shares
CY2013Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Suspense Shares EmployeeStockOwnershipPlanESOPNumberOfSuspenseShares	500000	shares
CY2014Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Suspense Shares EmployeeStockOwnershipPlanESOPNumberOfSuspenseShares	300000	shares
CY2015Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Suspense Shares EmployeeStockOwnershipPlanESOPNumberOfSuspenseShares	0	shares
CY2013Q4	us-gaap	Employee Stock Ownership Plan Esop Shares In Esop EmployeeStockOwnershipPlanESOPSharesInESOP	2500000	shares
CY2014Q4	us-gaap	Employee Stock Ownership Plan Esop Shares In Esop EmployeeStockOwnershipPlanESOPSharesInESOP	2200000	shares
CY2015Q4	us-gaap	Employee Stock Ownership Plan Esop Shares In Esop EmployeeStockOwnershipPlanESOPSharesInESOP	1800000	shares
CY2014Q4	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	29000000	USD
CY2015Q4	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	58100000	USD
CY2014Q4	us-gaap	Equity Method Investments EquityMethodInvestments	121100000	USD
CY2015Q4	us-gaap	Equity Method Investments EquityMethodInvestments	124500000	USD
CY2014Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	100000	USD
CY2015Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	4100000	USD
CY2015Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	44600000	USD
CY2015Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	5100000	USD
CY2015Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	4200000	USD
CY2015Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	4400000	USD
CY2015Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	4700000	USD
CY2015Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	5000000	USD
CY2014Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	1900000	USD
CY2015Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	68000000	USD
CY2015	us-gaap	Finitelived Intangible Assets Acquired1 FinitelivedIntangibleAssetsAcquired1	70400000	USD
CY2013	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-2600000	USD
CY2014	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-200000	USD
CY2015	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-200000	USD
CY2014Q4	us-gaap	Goodwill Goodwill	2900000	USD
CY2015Q4	us-gaap	Goodwill Goodwill	130600000	USD
CY2015	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	127700000	USD
CY2013	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	0	USD
CY2014	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	0	USD
CY2015	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	36300000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	133400000	USD
CY2014	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	162200000	USD
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	166800000	USD
CY2013	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	20300000	USD
CY2014	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	19600000	USD
CY2015	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	16300000	USD
CY2013	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-4200000	USD
CY2014	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-2600000	USD
CY2015	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-1800000	USD
CY2013	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	28700000	USD
CY2014	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	36700000	USD
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	25300000	USD
CY2013	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	46700000	USD
CY2014	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	56800000	USD
CY2015	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	58400000	USD
CY2013	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-900000	USD
CY2014	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-100000	USD
CY2015	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	100000	USD
CY2013	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	4300000	USD
CY2014	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	7200000	USD
CY2015	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	4400000	USD
CY2013	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	19200000	USD
CY2014	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	23700000	USD
CY2015	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	37000000	USD
CY2013	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	500000	USD
CY2014	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	5100000	USD
CY2015	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	400000	USD
CY2013	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-8600000	USD
CY2014	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-3500000	USD
CY2015	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	1100000	USD
CY2013	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	1100000	USD
CY2014	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	10900000	USD
CY2015	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-19300000	USD
CY2013	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	4600000	USD
CY2014	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	7800000	USD
CY2015	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	3300000	USD
CY2013	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	-700000	USD
CY2014	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	22400000	USD
CY2015	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	12400000	USD
CY2013	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	10500000	USD
CY2014	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-17500000	USD
CY2015	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-22100000	USD
CY2013	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	1400000	USD
CY2014	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-3500000	USD
CY2015	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	5100000	USD
CY2013	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	-18300000	USD
CY2014	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	-21300000	USD
CY2015	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	600000	USD
CY2013	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-7100000	USD
CY2014	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	2600000	USD
CY2015	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-3500000	USD
CY2013	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-1400000	USD
CY2014	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	4800000	USD
CY2015	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	3700000	USD
CY2013	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	5400000	USD
CY2014	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-5400000	USD
CY2015	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	0	USD
CY2014Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	1900000	USD
CY2015Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	84600000	USD
CY2014Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	4800000	USD
CY2015Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	215200000	USD
CY2013	us-gaap	Interest Expense InterestExpense	50300000	USD
CY2014	us-gaap	Interest Expense InterestExpense	54800000	USD
CY2015	us-gaap	Interest Expense InterestExpense	64900000	USD
CY2013	us-gaap	Interest Paid Net InterestPaidNet	47500000	USD
CY2014	us-gaap	Interest Paid Net InterestPaidNet	51300000	USD
CY2015	us-gaap	Interest Paid Net InterestPaidNet	59000000	USD
CY2014Q4	us-gaap	Interest Payable Current InterestPayableCurrent	18000000	USD
CY2015Q4	us-gaap	Interest Payable Current InterestPayableCurrent	18600000	USD
CY2014Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	0	USD
CY2015Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	7500000	USD
CY2014Q4	us-gaap	Inventory Net InventoryNet	80500000	USD
CY2015Q4	us-gaap	Inventory Net InventoryNet	117100000	USD
CY2014Q4	us-gaap	Inventory Raw Materials InventoryRawMaterials	0	USD
CY2015Q4	us-gaap	Inventory Raw Materials InventoryRawMaterials	2700000	USD
CY2014Q4	us-gaap	Inventory Supplies Net Of Reserves InventorySuppliesNetOfReserves	51500000	USD
CY2015Q4	us-gaap	Inventory Supplies Net Of Reserves InventorySuppliesNetOfReserves	49100000	USD
CY2014Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	0	USD
CY2015Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	300000	USD
CY2014Q4	us-gaap	Jointly Owned Utility Plant Gross Ownership Amount Of Plant In Service JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService	474600000	USD
CY2015Q4	us-gaap	Jointly Owned Utility Plant Gross Ownership Amount Of Plant In Service JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService	769300000	USD
CY2014Q4	us-gaap	Jointly Owned Utility Plant Ownership Amount Of Construction Work In Progress JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress	212100000	USD
CY2015Q4	us-gaap	Jointly Owned Utility Plant Ownership Amount Of Construction Work In Progress JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress	6900000	USD
CY2014Q4	us-gaap	Jointly Owned Utility Plant Ownership Amount Of Plant Accumulated Depreciation JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation	210800000	USD
CY2015Q4	us-gaap	Jointly Owned Utility Plant Ownership Amount Of Plant Accumulated Depreciation JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation	198400000	USD
CY2013	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	13800000	USD
CY2014	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	14800000	USD
CY2015	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	17300000	USD
CY2014Q4	us-gaap	Liabilities Liabilities	2749600000	USD
CY2015Q4	us-gaap	Liabilities Liabilities	3084700000	USD
CY2014Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	4360800000	USD
CY2015Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	4907100000	USD
CY2014Q4	us-gaap	Liabilities Current LiabilitiesCurrent	416000000	USD
CY2015Q4	us-gaap	Liabilities Current LiabilitiesCurrent	275400000	USD
CY2014Q4	us-gaap	Long Term Debt LongTermDebt	1373500000	USD
CY2015Q4	us-gaap	Long Term Debt LongTermDebt	1605000000	USD
CY2014Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	100700000	USD
CY2015Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	36300000	USD
CY2015Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	1151500000	USD
CY2015Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	36300000	USD
CY2015Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	103000000	USD
CY2015Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	56500000	USD
CY2015Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	64100000	USD
CY2015Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	193600000	USD
CY2014Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1272800000	USD
CY2015Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1568700000	USD
CY2014Q4	us-gaap	Long Term Investments LongTermInvestments	114400000	USD
CY2015Q4	us-gaap	Long Term Investments LongTermInvestments	74600000	USD
CY2014Q4	us-gaap	Minority Interest MinorityInterest	1800000	USD
CY2015Q4	us-gaap	Minority Interest MinorityInterest	2200000	USD
CY2013	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	113700000	USD
CY2014	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	404400000	USD
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	229900000	USD
CY2013	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-336600000	USD
CY2014	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-625700000	USD
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-618800000	USD
CY2013	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	239400000	USD
CY2014	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	269800000	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	340100000	USD
CY2013	us-gaap	Net Income Loss NetIncomeLoss	104700000	USD
CY2014Q1	us-gaap	Net Income Loss NetIncomeLoss	33500000	USD
CY2014Q2	us-gaap	Net Income Loss NetIncomeLoss	16800000	USD
CY2014Q3	us-gaap	Net Income Loss NetIncomeLoss	41600000	USD
CY2014Q4	us-gaap	Net Income Loss NetIncomeLoss	32900000	USD
CY2014	us-gaap	Net Income Loss NetIncomeLoss	124800000	USD
CY2015Q1	us-gaap	Net Income Loss NetIncomeLoss	39900000	USD
CY2015Q2	us-gaap	Net Income Loss NetIncomeLoss	22500000	USD
CY2015Q3	us-gaap	Net Income Loss NetIncomeLoss	60400000	USD
CY2015Q4	us-gaap	Net Income Loss NetIncomeLoss	18300000	USD
CY2015	us-gaap	Net Income Loss NetIncomeLoss	141100000	USD
CY2013	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2014	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	700000	USD
CY2015	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	400000	USD
CY2013	us-gaap	Net Income Loss Attributable To Parent Diluted NetIncomeLossAttributableToParentDiluted	104700000	USD
CY2014	us-gaap	Net Income Loss Attributable To Parent Diluted NetIncomeLossAttributableToParentDiluted	124800000	USD
CY2015	us-gaap	Net Income Loss Attributable To Parent Diluted NetIncomeLossAttributableToParentDiluted	141100000	USD
CY2013	us-gaap	Noncash Or Part Noncash Acquisition Value Of Liabilities Assumed1 NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1	0	USD
CY2014	us-gaap	Noncash Or Part Noncash Acquisition Value Of Liabilities Assumed1 NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1	0	USD
CY2015	us-gaap	Noncash Or Part Noncash Acquisition Value Of Liabilities Assumed1 NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1	35700000	USD
CY2013	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-20700000	USD
CY2014	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-26600000	USD
CY2015	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-43900000	USD
CY2014Q4	us-gaap	Notes Payable Current NotesPayableCurrent	3700000	USD
CY2015Q4	us-gaap	Notes Payable Current NotesPayableCurrent	1600000	USD
CY2015Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	47700000	USD
CY2014Q4	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	45100000	USD
CY2015Q4	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	42900000	USD
CY2014Q4	us-gaap	Other Assets Current OtherAssetsCurrent	82000000	USD
CY2015	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3
CY2015	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3
CY2013	us-gaap	Operating Expenses OperatingExpenses	267700000	USD
CY2014	us-gaap	Operating Expenses OperatingExpenses	287100000	USD
CY2015	us-gaap	Operating Expenses OperatingExpenses	333500000	USD
CY2013	us-gaap	Operating Income Loss OperatingIncomeLoss	154100000	USD
CY2014Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	48300000	USD
CY2014Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	28200000	USD
CY2014Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	60800000	USD
CY2014Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	51500000	USD
CY2014	us-gaap	Operating Income Loss OperatingIncomeLoss	188800000	USD
CY2015Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	56400000	USD
CY2015Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	39500000	USD
CY2015Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	85200000	USD
CY2015Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	29600000	USD
CY2015	us-gaap	Operating Income Loss OperatingIncomeLoss	210700000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	14000000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	6900000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	9900000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	11100000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	12600000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	23200000	USD
CY2014Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	27400000	USD
CY2015Q4	us-gaap	Other Assets Current OtherAssetsCurrent	35700000	USD
CY2014Q4	us-gaap	Other Assets Miscellaneous Current OtherAssetsMiscellaneousCurrent	14800000	USD
CY2015Q4	us-gaap	Other Assets Miscellaneous Current OtherAssetsMiscellaneousCurrent	19500000	USD
CY2014Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	59600000	USD
CY2015Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	80700000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	0	USD
CY2014	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-200000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-300000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	4600000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-5300000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-4600000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	0	USD
CY2014	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	100000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	100000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	4900000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-4000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-3400000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-4800000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	4000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	3000000	USD
CY2015	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	4700000	USD
CY2013	us-gaap	Payments For Construction In Process PaymentsForConstructionInProcess	0	USD
CY2013	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-3300000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	2800000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	2200000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	100000	USD
CY2014	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	200000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	100000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	0	USD
CY2014	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-200000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-500000	USD
CY2013	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	1000000	USD
CY2014	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	700000	USD
CY2015	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	5600000	USD
CY2013	us-gaap	Other Income OtherIncome	2500000	USD
CY2014	us-gaap	Other Income OtherIncome	600000	USD
CY2015	us-gaap	Other Income OtherIncome	1300000	USD
CY2014Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	120800000	USD
CY2015Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	86100000	USD
CY2014Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	265000000	USD
CY2015Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	349000000	USD
CY2014Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	4400000	USD
CY2015Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	4000000	USD
CY2013	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	9300000	USD
CY2014	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	8600000	USD
CY2014	us-gaap	Payments For Construction In Process PaymentsForConstructionInProcess	25700000	USD
CY2015	us-gaap	Payments For Construction In Process PaymentsForConstructionInProcess	0	USD
CY2013	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	12300000	USD
CY2014	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-33000000	USD
CY2015	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-3100000	USD
CY2013	us-gaap	Payments For Repurchase Of Redeemable Noncontrolling Interest PaymentsForRepurchaseOfRedeemableNoncontrollingInterest	0	USD
CY2014	us-gaap	Payments For Repurchase Of Redeemable Noncontrolling Interest PaymentsForRepurchaseOfRedeemableNoncontrollingInterest	6000000	USD
CY2015	us-gaap	Payments For Repurchase Of Redeemable Noncontrolling Interest PaymentsForRepurchaseOfRedeemableNoncontrollingInterest	0	USD
CY2013	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	1400000	USD
CY2014	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	3100000	USD
CY2015	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	4100000	USD
CY2013	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	75200000	USD
CY2014	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	83800000	USD
CY2015	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	97900000	USD
CY2013	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	4700000	USD
CY2014	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	5000000	USD
CY2015	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	2300000	USD
CY2013	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2014	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	60300000	USD
CY2015	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	333300000	USD
CY2013	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	3100000	USD
CY2014	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	3900000	USD
CY2015	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	1600000	USD
CY2013	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	328500000	USD
CY2014	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	572800000	USD
CY2015	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	286800000	USD
CY2013	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	10800000	USD
CY2014	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	0	USD
CY2015	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	0	USD
CY2013	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	21000000	USD
CY2014	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	12800000	USD
CY2015	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	15400000	USD
CY2014Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	190900000	USD
CY2015Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	206800000	USD
CY2014Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	82000000	USD
CY2015Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	35700000	USD
CY2013	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	98200000	USD
CY2014	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	200600000	USD
CY2015	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	161200000	USD
CY2015Q3	us-gaap	Proceeds From Issuance Of First Mortgage Bond ProceedsFromIssuanceOfFirstMortgageBond	100000000	USD
CY2013	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	169800000	USD
CY2014	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	375000000	USD
CY2015	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	324500000	USD
CY2013	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
CY2014	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	54300000	USD
CY2015	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
CY2013	us-gaap	Proceeds From Repayments Of Notes Payable ProceedsFromRepaymentsOfNotesPayable	0	USD
CY2014	us-gaap	Proceeds From Repayments Of Notes Payable ProceedsFromRepaymentsOfNotesPayable	3700000	USD
CY2015	us-gaap	Proceeds From Repayments Of Notes Payable ProceedsFromRepaymentsOfNotesPayable	-2100000	USD
CY2013	us-gaap	Proceeds From Repayments Of Restricted Cash Financing Activities ProceedsFromRepaymentsOfRestrictedCashFinancingActivities	0	USD
CY2014	us-gaap	Proceeds From Repayments Of Restricted Cash Financing Activities ProceedsFromRepaymentsOfRestrictedCashFinancingActivities	-1800000	USD
CY2015	us-gaap	Proceeds From Repayments Of Restricted Cash Financing Activities ProceedsFromRepaymentsOfRestrictedCashFinancingActivities	8500000	USD
CY2013	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	16100000	USD
CY2014	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	3600000	USD
CY2015	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	1700000	USD
CY2013	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	1300000	USD
CY2014	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	0	USD
CY2015	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	400000	USD
CY2013	us-gaap	Profit Loss ProfitLoss	104700000	USD
CY2014	us-gaap	Profit Loss ProfitLoss	125500000	USD
CY2015	us-gaap	Profit Loss ProfitLoss	141500000	USD
CY2014	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	604300000	USD
CY2015	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	251800000	USD
CY2014Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3284800000	USD
CY2015Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3669100000	USD
CY2013	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1300000	USD
CY2014	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1800000	USD
CY2015	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1600000	USD
CY2015Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	83300000	USD
CY2014Q4	us-gaap	Real Estate Investments RealEstateInvestments	88200000	USD
CY2015Q4	us-gaap	Real Estate Investments RealEstateInvestments	50100000	USD
CY2013	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-300000	USD
CY2014	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-1300000	USD
CY2015	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-1200000	USD
CY2014Q4	us-gaap	Regulatory Assets RegulatoryAssets	373600000	USD
CY2015Q4	us-gaap	Regulatory Assets RegulatoryAssets	382600000	USD
CY2014Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	16300000	USD
CY2015Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	10600000	USD
CY2014Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	357300000	USD
CY2015Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	372000000	USD
CY2014Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	94200000	USD
CY2015Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	105000000	USD
CY2013	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	77700000	USD
CY2014	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	134500000	USD
CY2015	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	160200000	USD
CY2014Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	2700000	USD
CY2015Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	5600000	USD
CY2014Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	5300000	USD
CY2015Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	8100000	USD
CY2014Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	530100000	USD
CY2015Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	573300000	USD
CY2013	us-gaap	Revenues Revenues	1018400000	USD
CY2014Q1	us-gaap	Revenues Revenues	296500000	USD
CY2014Q2	us-gaap	Revenues Revenues	260700000	USD
CY2014Q3	us-gaap	Revenues Revenues	288900000	USD
CY2014Q4	us-gaap	Revenues Revenues	290700000	USD
CY2014	us-gaap	Revenues Revenues	1136800000	USD
CY2015Q1	us-gaap	Revenues Revenues	320000000	USD
CY2015Q2	us-gaap	Revenues Revenues	323300000	USD
CY2015Q3	us-gaap	Revenues Revenues	462500000	USD
CY2015Q4	us-gaap	Revenues Revenues	380600000	USD
CY2015	us-gaap	Revenues Revenues	1486400000	USD
CY2013	us-gaap	Share Based Compensation ShareBasedCompensation	2400000	USD
CY2014	us-gaap	Share Based Compensation ShareBasedCompensation	2300000	USD
CY2015	us-gaap	Share Based Compensation ShareBasedCompensation	2600000	USD
CY2015Q4	us-gaap	Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Amount Of Unrecorded Benefit SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit	0	USD
CY2013	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	0	USD
CY2014	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	19500000	USD
CY2015	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	0	USD
CY2013	us-gaap	Stock Issued During Period Value Employee Stock Ownership Plan StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan	7000000	USD
CY2014	us-gaap	Stock Issued During Period Value Employee Stock Ownership Plan StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan	7100000	USD
CY2015	us-gaap	Stock Issued During Period Value Employee Stock Ownership Plan StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan	7200000	USD
CY2013	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	100500000	USD
CY2014	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	222400000	USD
CY2015	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	163800000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	1201000000	USD
CY2013Q4	us-gaap	Stockholders Equity StockholdersEquity	1342900000	USD
CY2014Q4	us-gaap	Stockholders Equity StockholdersEquity	1609400000	USD
CY2015Q4	us-gaap	Stockholders Equity StockholdersEquity	1820200000	USD
CY2014Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1611200000	USD
CY2015Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1822400000	USD
CY2013	us-gaap	Taxes Other TaxesOther	41700000	USD
CY2014	us-gaap	Taxes Other TaxesOther	45600000	USD
CY2015	us-gaap	Taxes Other TaxesOther	51400000	USD
CY2014Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	38700000	USD
CY2015Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	44000000	USD
CY2015	us-gaap	Types Of Net Regulatory Assets Earning Returns TypesOfNetRegulatoryAssetsEarningReturns	No regulatory assets or liabilities are currently earning a return.
CY2014Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	18600000	USD
CY2015Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	16900000	USD
CY2014Q4	us-gaap	Unearned Esop Shares UnearnedESOPShares	7200000	USD
CY2015Q4	us-gaap	Unearned Esop Shares UnearnedESOPShares	0	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	2700000	USD
CY2013Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1200000	USD
CY2014Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	2000000	USD
CY2015Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	2400000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2014	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2015	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	700000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	2900000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2015	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2013	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense	0	USD
CY2014	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense	0	USD
CY2015	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense	0	USD
CY2013	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	100000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	500000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1300000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1000000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	700000	USD
CY2013Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	500000	USD
CY2014Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	0	USD
CY2015Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	0	USD
CY2013	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2014	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	200000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	100000	USD
CY2015Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	500000	USD
CY2013	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	100000	shares
CY2014	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	200000	shares
CY2015	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	100000	shares
CY2013	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	39800000	shares
CY2014	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	43100000	shares
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48400000	shares
CY2013	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	39700000	shares
CY2014	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	42900000	shares
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	48300000	shares
CY2015	us-gaap	Property Plant And Equipment Impairment PropertyPlantAndEquipmentImpairment	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;"></font><font style="font-family:inherit;font-size:10pt;">The Company assesses the impairment of property, plant, and equipment whenever events or changes in circumstances indicate that the carrying amount of property, plant, and equipment assets may not be recoverable.</font></div></div>
CY2015	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;"></font><font style="font-family:inherit;font-size:10pt;">As a result of recent acquisitions, certain financial statement captions have been added and we have reclassified certain prior-period amounts on our Consolidated Balance Sheet and Consolidated Statement of Income to conform to the presentation for the current period. </font></div></div>

Files In Submission

Name	View Source	Status
0000066756-16-000169-index-headers.html	Edgar Link	pending
0000066756-16-000169-index.html	Edgar Link	pending
0000066756-16-000169.txt	Edgar Link	pending
0000066756-16-000169-xbrl.zip	Edgar Link	pending
ale-20151231.xml	Edgar Link	completed
ale-20151231.xsd	Edgar Link	pending
ale-20151231_cal.xml	Edgar Link	unprocessable
ale-20151231_def.xml	Edgar Link	unprocessable
ale-20151231_lab.xml	Edgar Link	unprocessable
ale-20151231_pre.xml	Edgar Link	unprocessable
ale12312015-10k.htm	Edgar Link	pending
ale1231201_chart-53916.jpg	Edgar Link	pending
exhibit10e612-31x2015.htm	Edgar Link	pending
exhibit10k212-31x2015.htm	Edgar Link	pending
exhibit10k312-31x2015.htm	Edgar Link	pending
exhibit1212-31x2015.htm	Edgar Link	pending
exhibit2112-31x2015.htm	Edgar Link	pending
exhibit2312-31x2015.htm	Edgar Link	pending
exhibit31a12-31x2015.htm	Edgar Link	pending
exhibit31b12-31x2015.htm	Edgar Link	pending
exhibit3212-31x2015.htm	Edgar Link	pending
exhibit9512-31x2015.htm	Edgar Link	pending
exhibit9912-31x2015.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
logoallete201510k.jpg	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R100.htm	Edgar Link	pending
R101.htm	Edgar Link	pending
R102.htm	Edgar Link	pending
R103.htm	Edgar Link	pending
R104.htm	Edgar Link	pending
R105.htm	Edgar Link	pending
R106.htm	Edgar Link	pending
R107.htm	Edgar Link	pending
R108.htm	Edgar Link	pending
R109.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R110.htm	Edgar Link	pending
R111.htm	Edgar Link	pending
R112.htm	Edgar Link	pending
R113.htm	Edgar Link	pending
R114.htm	Edgar Link	pending
R115.htm	Edgar Link	pending
R116.htm	Edgar Link	pending
R117.htm	Edgar Link	pending
R118.htm	Edgar Link	pending
R119.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R120.htm	Edgar Link	pending
R121.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
R21.htm	Edgar Link	pending
R22.htm	Edgar Link	pending
R23.htm	Edgar Link	pending
R24.htm	Edgar Link	pending
R25.htm	Edgar Link	pending
R26.htm	Edgar Link	pending
R27.htm	Edgar Link	pending
R28.htm	Edgar Link	pending
R29.htm	Edgar Link	pending
R3.htm	Edgar Link	pending
R30.htm	Edgar Link	pending
R31.htm	Edgar Link	pending
R32.htm	Edgar Link	pending
R33.htm	Edgar Link	pending
R34.htm	Edgar Link	pending
R35.htm	Edgar Link	pending
R36.htm	Edgar Link	pending
R37.htm	Edgar Link	pending
R38.htm	Edgar Link	pending
R39.htm	Edgar Link	pending
R4.htm	Edgar Link	pending
R40.htm	Edgar Link	pending
R41.htm	Edgar Link	pending
R42.htm	Edgar Link	pending
R43.htm	Edgar Link	pending
R44.htm	Edgar Link	pending
R45.htm	Edgar Link	pending
R46.htm	Edgar Link	pending
R47.htm	Edgar Link	pending
R48.htm	Edgar Link	pending
R49.htm	Edgar Link	pending
R5.htm	Edgar Link	pending
R50.htm	Edgar Link	pending
R51.htm	Edgar Link	pending
R52.htm	Edgar Link	pending
R53.htm	Edgar Link	pending
R54.htm	Edgar Link	pending
R55.htm	Edgar Link	pending
R56.htm	Edgar Link	pending
R57.htm	Edgar Link	pending
R58.htm	Edgar Link	pending
R59.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R61.htm	Edgar Link	pending
R62.htm	Edgar Link	pending
R63.htm	Edgar Link	pending
R64.htm	Edgar Link	pending
R65.htm	Edgar Link	pending
R66.htm	Edgar Link	pending
R67.htm	Edgar Link	pending
R68.htm	Edgar Link	pending
R69.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R70.htm	Edgar Link	pending
R71.htm	Edgar Link	pending
R72.htm	Edgar Link	pending
R73.htm	Edgar Link	pending
R74.htm	Edgar Link	pending
R75.htm	Edgar Link	pending
R76.htm	Edgar Link	pending
R77.htm	Edgar Link	pending
R78.htm	Edgar Link	pending
R79.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R80.htm	Edgar Link	pending
R81.htm	Edgar Link	pending
R82.htm	Edgar Link	pending
R83.htm	Edgar Link	pending
R84.htm	Edgar Link	pending
R85.htm	Edgar Link	pending
R86.htm	Edgar Link	pending
R87.htm	Edgar Link	pending
R88.htm	Edgar Link	pending
R89.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
R90.htm	Edgar Link	pending
R91.htm	Edgar Link	pending
R92.htm	Edgar Link	pending
R93.htm	Edgar Link	pending
R94.htm	Edgar Link	pending
R95.htm	Edgar Link	pending
R96.htm	Edgar Link	pending
R97.htm	Edgar Link	pending
R98.htm	Edgar Link	pending
R99.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

Create your account

Find Stocks Worth Researching

Deeply Understand Businesses

Value Businesses Intelligently

$ALE
ALLETE INC Stock $ale

2014 Q4 Form 10-K Financial Statement

#000006675616000169 Filed on February 22, 2016

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ALE ALLETE INC Stock $ale

2014 Q4 Form 10-K Financial Statement

#000006675616000169 Filed on February 22, 2016

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ALE
ALLETE INC Stock $ale