$ALE
ALLETE INC Stock $ale

$ale Overview Financials Valuation SEC Filings Company Website

2015 Q3 Form 10-Q Financial Statement

#000006675615000104 Filed on November 03, 2015

Income Statement

Concept	2015 Q3	2014 Q3
Revenue	$462.5M	$288.9M
YoY Change	60.09%	15.1%
Cost Of Revenue	$149.8M	$16.80M
YoY Change	791.67%
Gross Profit	$312.7M	$272.1M
YoY Change	14.92%
Gross Profit Margin	67.61%	94.18%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$43.20M	$33.40M
YoY Change	29.34%	10.6%
% of Gross Profit	13.82%	12.27%
Operating Expenses	$81.30M	$65.70M
YoY Change	23.74%	-36.03%
Operating Profit	$85.20M	$60.80M
YoY Change	40.13%	58.33%
Interest Expense	$17.70M	$13.20M
YoY Change	34.09%	3.94%
% of Operating Profit	20.77%	21.71%
Other Income/Expense, Net	-$10.50M	-$5.800M
YoY Change	81.03%	28.89%
Pretax Income	$74.70M	$55.00M
YoY Change	35.82%	62.24%
Income Tax	$14.40M	$13.40M
% Of Pretax Income	19.28%	24.36%
Net Earnings	$60.40M	$41.60M
YoY Change	45.19%	65.08%
Net Earnings / Revenue	13.06%	14.4%
Basic Earnings Per Share	$1.24	$0.97
Diluted Earnings Per Share	$1.23	$0.97
COMMON SHARES
Basic Shares Outstanding	48.80M shares	42.90M shares
Diluted Shares Outstanding	48.90M shares	42.90M shares

Balance Sheet

Concept	2015 Q3	2014 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$103.0M	$150.5M
YoY Change	-31.56%	-8.51%
Cash & Equivalents	$103.0M	$150.5M
Short-Term Investments
Other Short-Term Assets	$42.50M	$29.30M
YoY Change	45.05%	357.81%
Inventory	$119.1M	$71.60M
Prepaid Expenses
Receivables	$110.7M	$82.40M
Other Receivables	$0.00	$0.00
Total Short-Term Assets	$403.3M	$357.8M
YoY Change	12.72%	-3.04%
LONG-TERM ASSETS
Property, Plant & Equipment	$3.639B	$3.122B
YoY Change	16.58%	27.09%
Goodwill	$131.0M
YoY Change
Intangibles	$81.90M
YoY Change
Long-Term Investments	$126.0M	$120.7M
YoY Change	4.39%	7.1%
Other Assets	$83.70M	$74.40M
YoY Change	12.5%	73.43%
Total Long-Term Assets	$4.529B	$3.710B
YoY Change	22.06%	19.88%
TOTAL ASSETS
Total Short-Term Assets	$403.3M	$357.8M
Total Long-Term Assets	$4.529B	$3.710B
Total Assets	$4.932B	$4.068B
YoY Change	21.24%	17.44%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$125.0M	$92.70M
YoY Change	34.84%	9.96%
Accrued Expenses	$14.50M	$14.80M
YoY Change	-2.03%	-0.67%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$2.700M
YoY Change	-100.0%	125.0%
Long-Term Debt Due	$49.10M	$85.30M
YoY Change	-42.44%	126.26%
Total Short-Term Liabilities	$317.7M	$286.8M
YoY Change	10.77%	28.32%
LONG-TERM LIABILITIES
Long-Term Debt	$1.549B	$1.289B
YoY Change	20.15%	21.14%
Other Long-Term Liabilities	$352.7M	$231.6M
YoY Change	52.29%	79.4%
Total Long-Term Liabilities	$1.902B	$1.521B
YoY Change	25.05%	27.44%
TOTAL LIABILITIES
Total Short-Term Liabilities	$317.7M	$286.8M
Total Long-Term Liabilities	$1.902B	$1.521B
Total Liabilities	$3.108B	$2.537B
YoY Change	22.51%	16.58%
SHAREHOLDERS EQUITY
Retained Earnings	$578.8M	$518.6M
YoY Change	11.61%	9.39%
Common Stock	$1.265B	$1.035B
YoY Change	22.18%	21.83%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.822B	$1.529B
YoY Change
Total Liabilities & Shareholders Equity	$4.932B	$4.068B
YoY Change	21.24%	17.44%

Cashflow Statement

Concept	2015 Q3	2014 Q3
OPERATING ACTIVITIES
Net Income	$60.40M	$41.60M
YoY Change	45.19%	65.08%
Depreciation, Depletion And Amortization	$43.20M	$33.40M
YoY Change	29.34%	10.6%
Cash From Operating Activities	$72.30M	$86.00M
YoY Change	-15.93%	10.54%
INVESTING ACTIVITIES
Capital Expenditures	-$67.70M	-$133.9M
YoY Change	-49.44%	100.75%
Acquisitions
YoY Change
Other Investing Activities	-$95.40M	-$1.200M
YoY Change	7850.0%	-61.29%
Cash From Investing Activities	-$163.1M	-$135.1M
YoY Change	20.73%	93.55%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	133.2M	116.0M
YoY Change	14.83%	908.7%
NET CHANGE
Cash From Operating Activities	72.30M	86.00M
Cash From Investing Activities	-163.1M	-135.1M
Cash From Financing Activities	133.2M	116.0M
Net Change In Cash	42.40M	66.90M
YoY Change	-36.62%	243.08%
FREE CASH FLOW
Cash From Operating Activities	$72.30M	$86.00M
Capital Expenditures	-$67.70M	-$133.9M
Free Cash Flow	$140.0M	$219.9M
YoY Change	-36.33%	52.18%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	ale	Amortizationof Power Purchase Agreements AmortizationofPowerPurchaseAgreements	9000000	USD
	ale	Amortizationof Power Purchase Agreements AmortizationofPowerPurchaseAgreements	17100000	USD
CY2015Q3	ale	Availableforsale Securities Debt Maturities After Five Years Fair Value AvailableforsaleSecuritiesDebtMaturitiesAfterFiveYearsFairValue	6400000	USD
CY2015Q3	ale	Availableforsale Securities Debt Maturities After One Year Through Three Years Fair Value AvailableforsaleSecuritiesDebtMaturitiesAfterOneYearThroughThreeYearsFairValue	1600000	USD
CY2015Q3	ale	Availableforsale Securities Debt Maturities After Three Years Through Five Years Fair Value AvailableforsaleSecuritiesDebtMaturitiesAfterThreeYearsThroughFiveYearsFairValue	3000000	USD
CY2015Q3	ale	Cip Energy Savings Goal CIPEnergySavingsGoal	0.015
	ale	Cip Financial Incentive CIPFinancialIncentive	8700000	USD
	ale	Cip Financial Incentive CIPFinancialIncentive	6200000	USD
CY2015Q3	ale	Debt Instrument Actual Indebtedness To Total Capital Ratio DebtInstrumentActualIndebtednessToTotalCapitalRatio	0.47
CY2015Q3	ale	Debt Instrument Required Indebtedness To Total Capital Ratio DebtInstrumentRequiredIndebtednessToTotalCapitalRatio	0.65
	ale	Effective Income Tax Rate Reconciliation Combined Federaland State Statutory Rate Percent EffectiveIncomeTaxRateReconciliationCombinedFederalandStateStatutoryRatePercent	0.41
	ale	Effective Income Tax Rate Reconciliation Regulatory Differences EffectiveIncomeTaxRateReconciliationRegulatoryDifferences	-2100000	USD
	ale	Effective Income Tax Rate Reconciliation Regulatory Differences EffectiveIncomeTaxRateReconciliationRegulatoryDifferences	-700000	USD
CY2015Q3	ale	Equity Method Investment Approved Return On Common Equity EquityMethodInvestmentApprovedReturnOnCommonEquity	0.122
CY2015Q3	ale	Equity Method Investment Expected Additional Investment EquityMethodInvestmentExpectedAdditionalInvestment	0	USD
	dei	Document Type DocumentType	10-Q
	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	800000	USD
	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	5000000	USD
	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	300000	USD
	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	0	USD
CY2014Q3	ale	Equity Method Investment Summarized Financial Information Other Expense EquityMethodInvestmentSummarizedFinancialInformationOtherExpense	21400000	USD
	ale	Equity Method Investment Summarized Financial Information Other Expense EquityMethodInvestmentSummarizedFinancialInformationOtherExpense	65100000	USD
CY2015Q3	ale	Equity Method Investment Summarized Financial Information Other Expense EquityMethodInvestmentSummarizedFinancialInformationOtherExpense	23100000	USD
	ale	Equity Method Investment Summarized Financial Information Other Expense EquityMethodInvestmentSummarizedFinancialInformationOtherExpense	71700000	USD
	ale	Finite Lived Intangible Assets Other Changes FiniteLivedIntangibleAssetsOtherChanges	300000	USD
	ale	Gains Losson Saleof Assets Investments GainsLossonSaleofAssetsInvestments	-200000	USD
	ale	Gains Losson Saleof Assets Investments GainsLossonSaleofAssetsInvestments	-200000	USD
	ale	Intangible Assets Acquired IntangibleAssetsAcquired	83100000	USD
	ale	Intangible Assets Other Changes IntangibleAssetsOtherChanges	300000	USD
CY2014Q4	ale	Investments Cash And Cash Equivalents Fair Value Disclosure InvestmentsCashAndCashEquivalentsFairValueDisclosure	2900000	USD
CY2015Q3	ale	Investments Cash And Cash Equivalents Fair Value Disclosure InvestmentsCashAndCashEquivalentsFairValueDisclosure	2600000	USD
CY2014Q4	ale	Power Purchase Agreement Current Liability PowerPurchaseAgreementCurrentLiability	19400000	USD
CY2015Q3	ale	Power Purchase Agreement Current Liability PowerPurchaseAgreementCurrentLiability	23800000	USD
CY2014Q4	ale	Power Purchase Agreement Noncurrent Liability PowerPurchaseAgreementNoncurrentLiability	110700000	USD
CY2015Q3	ale	Power Purchase Agreement Noncurrent Liability PowerPurchaseAgreementNoncurrentLiability	143900000	USD
	dei	Amendment Flag AmendmentFlag	false
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2015
	dei	Document Period End Date DocumentPeriodEndDate	2015-09-30
	dei	Entity Central Index Key EntityCentralIndexKey	0000066756
CY2015Q3	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	48965562	shares
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Registrant Name EntityRegistrantName	ALLETE INC
	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2014Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	134100000	USD
CY2015Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	125000000	USD
CY2014Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	103000000	USD
CY2015Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	110700000	USD
CY2013Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-17100000	USD
CY2014Q2	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-16300000	USD
CY2014Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-16100000	USD
CY2014Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-21100000	USD
CY2015Q2	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-20200000	USD
CY2015Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-20600000	USD
CY2014Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1100000	USD
CY2015Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1300000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2800000	USD
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2014Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	109200000	USD
CY2015Q3	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	126300000	USD
CY2014Q3	us-gaap	Assets Assets	4067900000	USD
CY2014Q4	us-gaap	Assets Assets	4360800000	USD
CY2015Q3	us-gaap	Assets Assets	4931800000	USD
CY2014Q4	us-gaap	Assets Current AssetsCurrent	418800000	USD
CY2015Q3	us-gaap	Assets Current AssetsCurrent	403300000	USD
CY2014Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	200000	USD
CY2015Q3	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	100000	USD
CY2014Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	900000	USD
CY2015Q3	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	1700000	USD
CY2014Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	19600000	USD
CY2015Q3	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	20100000	USD
CY2015Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	200000	USD
CY2014Q3	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	0	USD
	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	200000	USD
CY2015Q3	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	0	USD
	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	100000	USD
CY2014Q3	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	600000	USD
	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	3300000	USD
CY2015Q3	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	0	USD
	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	700000	USD
CY2014Q3	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	0	USD
CY2015Q3	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	0	USD
	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	0	USD
CY2014Q4	us-gaap	Available For Sale Securities Noncurrent AvailableForSaleSecuritiesNoncurrent	18900000	USD
CY2015Q3	us-gaap	Available For Sale Securities Noncurrent AvailableForSaleSecuritiesNoncurrent	18500000	USD
CY2014Q4	us-gaap	Billings In Excess Of Cost Current BillingsInExcessOfCostCurrent	0	USD
CY2015Q3	us-gaap	Billings In Excess Of Cost Current BillingsInExcessOfCostCurrent	8800000	USD
CY2014	us-gaap	Business Acquisition Pro Forma Information Description BusinessAcquisitionProFormaInformationDescription	not significant
	us-gaap	Business Acquisition Pro Forma Information Description BusinessAcquisitionProFormaInformationDescription	not significant
CY2014Q4	us-gaap	Business Combination Contingent Consideration Liability Noncurrent BusinessCombinationContingentConsiderationLiabilityNoncurrent	0	USD
CY2015Q3	us-gaap	Business Combination Contingent Consideration Liability Noncurrent BusinessCombinationContingentConsiderationLiabilityNoncurrent	37400000	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.
	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.
	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	6500000	USD
	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	26800000	USD
CY2013Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	97300000	USD
CY2014Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	150500000	USD
CY2014Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	145800000	USD
CY2015Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	103000000	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	53200000	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-42800000	USD
CY2014Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2015Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2014Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.49
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.47
CY2015Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.505
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.515
CY2014Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0.00
CY2015Q3	us-gaap	Common Stock No Par Value CommonStockNoParValue	0.00
CY2014Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	80000000	shares
CY2015Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	80000000	shares
CY2014Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	45900000	shares
CY2015Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	49000000	shares
CY2014Q4	us-gaap	Common Stock Value CommonStockValue	1107600000	USD
CY2015Q3	us-gaap	Common Stock Value CommonStockValue	1264900000	USD
CY2014Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	41800000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	92900000	USD
CY2015Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	60000000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	123300000	USD
CY2014Q3	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	400000	USD
CY2015Q3	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-100000	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-100000	USD
CY2014Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	41800000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	93300000	USD
CY2015Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	59900000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	123200000	USD
CY2014Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	48200000	USD
CY2015Q3	us-gaap	Construction In Progress Gross ConstructionInProgressGross	0	USD
CY2014Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	16800000	USD
	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	59200000	USD
CY2015Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	149800000	USD
	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	233300000	USD
CY2014Q3	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	88900000	USD
	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	268700000	USD
CY2015Q3	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	76800000	USD
	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	242900000	USD
CY2014Q3	us-gaap	Cost Of Transmission CostOfTransmission	11900000	USD
	us-gaap	Cost Of Transmission CostOfTransmission	33200000	USD
CY2015Q3	us-gaap	Cost Of Transmission CostOfTransmission	13900000	USD
	us-gaap	Cost Of Transmission CostOfTransmission	40100000	USD
CY2014Q3	us-gaap	Costs And Expenses CostsAndExpenses	228100000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	708800000	USD
CY2015Q3	us-gaap	Costs And Expenses CostsAndExpenses	377300000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	924700000	USD
CY2014Q3	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2015Q3	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2014Q3	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	1800000	USD
	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	1900000	USD
CY2015Q3	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	200000	USD
	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	500000	USD
CY2014Q3	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1800000	USD
	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1900000	USD
CY2015Q3	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	200000	USD
	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	500000	USD
CY2014Q4	us-gaap	Customer Advances Current CustomerAdvancesCurrent	54300000	USD
CY2015Q3	us-gaap	Customer Advances Current CustomerAdvancesCurrent	0	USD
CY2014Q4	us-gaap	Customer Deposits Current CustomerDepositsCurrent	19700000	USD
CY2015Q3	us-gaap	Customer Deposits Current CustomerDepositsCurrent	17600000	USD
CY2014Q4	us-gaap	Debt Current DebtCurrent	104400000	USD
CY2015Q3	us-gaap	Debt Current DebtCurrent	49100000	USD
CY2014Q3	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	11200000	USD
	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	20400000	USD
CY2015Q3	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	14800000	USD
	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	23500000	USD
CY2014Q4	us-gaap	Deferred Fuel Cost DeferredFuelCost	16300000	USD
CY2015Q3	us-gaap	Deferred Fuel Cost DeferredFuelCost	16300000	USD
CY2014Q3	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	11600000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	25200000	USD
CY2015Q3	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	14200000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	26500000	USD
CY2014Q3	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-300000	USD
	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-600000	USD
CY2015Q3	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-200000	USD
	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-600000	USD
CY2014Q3	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	700000	USD
	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	5400000	USD
CY2015Q3	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-400000	USD
	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	3600000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	7500000	USD
CY2015Q3	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	28000000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	510700000	USD
CY2015Q3	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	593600000	USD
	us-gaap	Depreciation Depreciation	99500000	USD
	us-gaap	Depreciation Depreciation	120700000	USD
CY2014Q3	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	33400000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	99500000	USD
CY2015Q3	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	43200000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	123500000	USD
	us-gaap	Description Of Effect On Previously Reported Segment Information For Change In Composition Of Reportable Segments DescriptionOfEffectOnPreviouslyReportedSegmentInformationForChangeInCompositionOfReportableSegments	During the quarter ended September 30, 2015, management updated our reportable segment presentation to reflect the manner in which we operate, assess, and allocate resources after our recent acquisitions. We will 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.
CY2014Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.97
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.18
CY2015Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.24
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.56
CY2014Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.97
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.17
CY2015Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.23
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.55
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.227
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.180
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	6700000	USD
	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	7300000	USD
CY2014Q4	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	29000000	USD
CY2015Q3	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	54000000	USD
	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	10400000	USD
CY2015Q3	us-gaap	Equity Method Investment Ownership Percentage EquityMethodInvestmentOwnershipPercentage	0.08
CY2014Q3	us-gaap	Equity Method Investment Summarized Financial Information Cost Of Sales EquityMethodInvestmentSummarizedFinancialInformationCostOfSales	76600000	USD
	us-gaap	Equity Method Investment Summarized Financial Information Cost Of Sales EquityMethodInvestmentSummarizedFinancialInformationCostOfSales	229600000	USD
CY2015Q3	us-gaap	Equity Method Investment Summarized Financial Information Cost Of Sales EquityMethodInvestmentSummarizedFinancialInformationCostOfSales	78000000	USD
	us-gaap	Equity Method Investment Summarized Financial Information Cost Of Sales EquityMethodInvestmentSummarizedFinancialInformationCostOfSales	238300000	USD
CY2014Q3	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	65600000	USD
	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	192300000	USD
CY2015Q3	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	63400000	USD
	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	172000000	USD
CY2014Q3	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	163600000	USD
	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	487000000	USD
CY2015Q3	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	164500000	USD
	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	482000000	USD
CY2014Q4	us-gaap	Equity Method Investments EquityMethodInvestments	121100000	USD
CY2015Q3	us-gaap	Equity Method Investments EquityMethodInvestments	126000000	USD
CY2014Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	100000	USD
CY2015Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	2900000	USD
CY2015Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	47600000	USD
CY2015Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	1100000	USD
CY2015Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	4000000	USD
CY2015Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	4100000	USD
CY2015Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	4200000	USD
CY2015Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	4300000	USD
CY2014Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	1900000	USD
CY2015Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	65300000	USD
	us-gaap	Finitelived Intangible Assets Acquired1 FinitelivedIntangibleAssetsAcquired1	66500000	USD
CY2014Q4	us-gaap	Goodwill Goodwill	2900000	USD
CY2015Q3	us-gaap	Goodwill Goodwill	131000000	USD
	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	128100000	USD
CY2014	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	0	USD
CY2015Q3	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	0	USD
	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	0	USD
CY2014Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	55000000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	119400000	USD
CY2015Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	74700000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	149700000	USD
CY2014Q3	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	5300000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	15600000	USD
CY2015Q3	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	5500000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	14100000	USD
	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-3000000	USD
	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-3700000	USD
CY2014Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	13400000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	27100000	USD
CY2015Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14400000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	27000000	USD
	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	41800000	USD
	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	52400000	USD
	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-1000000	USD
	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-300000	USD
	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	4800000	USD
	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	2600000	USD
	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	16400000	USD
	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	27000000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2800000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	100000	USD
	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	16900000	USD
	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	11600000	USD
	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-1200000	USD
	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	0	USD
	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	5900000	USD
	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	2600000	USD
	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	600000	USD
	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	7800000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-9200000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-24100000	USD
	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-12800000	USD
	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-800000	USD
	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	-13000000	USD
	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	-6200000	USD
	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	3800000	USD
	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	1500000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	8800000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-400000	USD
	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-5400000	USD
	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	0	USD
CY2014Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	1900000	USD
CY2015Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	81900000	USD
CY2014Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	4800000	USD
CY2015Q3	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	212900000	USD
CY2014Q4	us-gaap	Interest And Dividends Payable Current InterestAndDividendsPayableCurrent	18000000	USD
CY2015Q3	us-gaap	Interest And Dividends Payable Current InterestAndDividendsPayableCurrent	14500000	USD
CY2014Q3	us-gaap	Interest Expense InterestExpense	13200000	USD
	us-gaap	Interest Expense InterestExpense	39500000	USD
CY2015Q3	us-gaap	Interest Expense InterestExpense	17700000	USD
	us-gaap	Interest Expense InterestExpense	49000000	USD
	us-gaap	Interest Paid Net InterestPaidNet	39400000	USD
	us-gaap	Interest Paid Net InterestPaidNet	46600000	USD
CY2014Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	0	USD
CY2015Q3	us-gaap	Inventory Finished Goods InventoryFinishedGoods	8900000	USD
CY2014Q4	us-gaap	Inventory Net InventoryNet	80500000	USD
CY2015Q3	us-gaap	Inventory Net InventoryNet	119100000	USD
CY2014Q4	us-gaap	Inventory Raw Materials InventoryRawMaterials	0	USD
CY2015Q3	us-gaap	Inventory Raw Materials InventoryRawMaterials	3100000	USD
CY2014Q4	us-gaap	Inventory Supplies Net Of Reserves InventorySuppliesNetOfReserves	51500000	USD
CY2015Q3	us-gaap	Inventory Supplies Net Of Reserves InventorySuppliesNetOfReserves	52600000	USD
CY2014Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	0	USD
CY2015Q3	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	200000	USD
CY2014Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	0	USD
CY2015Q3	us-gaap	Inventory Work In Process InventoryWorkInProcess	700000	USD
CY2014Q4	us-gaap	Liabilities Liabilities	2749600000	USD
CY2015Q3	us-gaap	Liabilities Liabilities	3108400000	USD
CY2014Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	4360800000	USD
CY2015Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	4931800000	USD
CY2014Q4	us-gaap	Liabilities Current LiabilitiesCurrent	416000000	USD
CY2015Q3	us-gaap	Liabilities Current LiabilitiesCurrent	317700000	USD
CY2014Q4	us-gaap	Long Term Debt LongTermDebt	1373500000	USD
CY2015Q3	us-gaap	Long Term Debt LongTermDebt	1598100000	USD
CY2014Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	100700000	USD
CY2015Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	49100000	USD
CY2014Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	1484500000	USD
CY2015Q3	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	1685200000	USD
CY2014Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1272800000	USD
CY2015Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1549000000	USD
CY2014Q4	us-gaap	Long Term Investments LongTermInvestments	114400000	USD
CY2015Q3	us-gaap	Long Term Investments LongTermInvestments	113500000	USD
CY2014Q4	us-gaap	Minority Interest MinorityInterest	1800000	USD
CY2015Q3	us-gaap	Minority Interest MinorityInterest	1700000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	299600000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	236900000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-458500000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-534300000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	212100000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	254600000	USD
CY2014Q3	us-gaap	Net Income Loss NetIncomeLoss	41600000	USD
	us-gaap	Net Income Loss NetIncomeLoss	91900000	USD
CY2015Q3	us-gaap	Net Income Loss NetIncomeLoss	60400000	USD
	us-gaap	Net Income Loss NetIncomeLoss	122800000	USD
CY2014Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	400000	USD
CY2015Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-100000	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-100000	USD
CY2014Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	41600000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	91900000	USD
CY2015Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	60400000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	122800000	USD
CY2014Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	41600000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	91900000	USD
CY2015Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	60400000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	122800000	USD
	us-gaap	Noncash Or Part Noncash Acquisition Value Of Liabilities Assumed1 NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1	0	USD
	us-gaap	Noncash Or Part Noncash Acquisition Value Of Liabilities Assumed1 NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1	35700000	USD
CY2014Q3	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-5800000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	700000	USD
CY2015Q3	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	9300000	USD
CY2015Q3	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	10400000	USD
CY2015Q3	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	11800000	USD
	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-17900000	USD
CY2015Q3	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-10500000	USD
	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-31400000	USD
CY2014Q4	us-gaap	Notes Payable Current NotesPayableCurrent	3700000	USD
CY2015Q3	us-gaap	Notes Payable Current NotesPayableCurrent	0	USD
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3
CY2014Q3	us-gaap	Operating Expenses OperatingExpenses	65700000	USD
	us-gaap	Operating Expenses OperatingExpenses	214300000	USD
CY2015Q3	us-gaap	Operating Expenses OperatingExpenses	81300000	USD
	us-gaap	Operating Expenses OperatingExpenses	246400000	USD
CY2014Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	60800000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	137300000	USD
CY2015Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	85200000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	181100000	USD
CY2015Q3	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	15000000	USD
CY2015Q3	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	12900000	USD
CY2015Q3	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	29100000	USD
CY2014Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	27400000	USD
CY2015Q3	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	44100000	USD
CY2014Q4	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	45100000	USD
CY2015Q3	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	45100000	USD
CY2014Q4	us-gaap	Other Assets Current OtherAssetsCurrent	82000000	USD
CY2015Q3	us-gaap	Other Assets Current OtherAssetsCurrent	42500000	USD
CY2014Q4	us-gaap	Other Assets Miscellaneous Current OtherAssetsMiscellaneousCurrent	14800000	USD
CY2015Q3	us-gaap	Other Assets Miscellaneous Current OtherAssetsMiscellaneousCurrent	18100000	USD
CY2014Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	59600000	USD
CY2015Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	83700000	USD
CY2014Q3	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-100000	USD
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	200000	USD
CY2015Q3	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-700000	USD
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-300000	USD
CY2014Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	200000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1000000	USD
CY2015Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-400000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	500000	USD
CY2014Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-200000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-800000	USD
CY2015Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-300000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-1000000	USD
CY2014Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	200000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	600000	USD
CY2015Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	300000	USD
CY2014Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	500000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	1500000	USD
CY2015Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	500000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	1600000	USD
CY2014Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	100000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	100000	USD
CY2015Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	0	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	100000	USD
CY2014Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	0	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	100000	USD
CY2015Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	0	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	100000	USD
CY2014Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-100000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	100000	USD
CY2015Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-700000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-600000	USD
CY2014Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	0	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	100000	USD
CY2015Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-400000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-300000	USD
CY2014Q3	us-gaap	Other Expenses OtherExpenses	0	USD
	us-gaap	Other Expenses OtherExpenses	100000	USD
CY2015Q3	us-gaap	Other Income OtherIncome	700000	USD
	us-gaap	Other Income OtherIncome	800000	USD
CY2014Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	120800000	USD
CY2015Q3	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	94300000	USD
CY2014Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	265000000	USD
CY2015Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	352700000	USD
CY2014Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	4400000	USD
CY2015Q3	us-gaap	Other Long Term Investments OtherLongTermInvestments	4100000	USD
CY2014Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2100000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	6000000	USD
CY2015Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1700000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3500000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-31100000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	0	USD
	us-gaap	Payments For Repurchase Of Redeemable Noncontrolling Interest PaymentsForRepurchaseOfRedeemableNoncontrollingInterest	6000000	USD
	us-gaap	Payments For Repurchase Of Redeemable Noncontrolling Interest PaymentsForRepurchaseOfRedeemableNoncontrollingInterest	0	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	3100000	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	1000000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	62400000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	74000000	USD
	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	4300000	USD
	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	1100000	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	23100000	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	324800000	USD
	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	3100000	USD
	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	1200000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	467800000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	208200000	USD
	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	9600000	USD
	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	11500000	USD
CY2014Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	190900000	USD
CY2015Q3	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	189600000	USD
CY2014Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	82000000	USD
CY2015Q3	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	42500000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	128900000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	155200000	USD
CY2015Q3	us-gaap	Proceeds From Issuance Of First Mortgage Bond ProceedsFromIssuanceOfFirstMortgageBond	100000000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	375000000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	240000000	USD
	us-gaap	Proceeds From Repayments Of Notes Payable ProceedsFromRepaymentsOfNotesPayable	2700000	USD
	us-gaap	Proceeds From Repayments Of Notes Payable ProceedsFromRepaymentsOfNotesPayable	-3700000	USD
	us-gaap	Proceeds From Repayments Of Restricted Cash Financing Activities ProceedsFromRepaymentsOfRestrictedCashFinancingActivities	-1400000	USD
	us-gaap	Proceeds From Repayments Of Restricted Cash Financing Activities ProceedsFromRepaymentsOfRestrictedCashFinancingActivities	2200000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	3300000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	700000	USD
	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	0	USD
CY2014Q3	us-gaap	Profit Loss ProfitLoss	41600000	USD
	us-gaap	Profit Loss ProfitLoss	92300000	USD
CY2015Q3	us-gaap	Profit Loss ProfitLoss	60300000	USD
	us-gaap	Profit Loss ProfitLoss	122700000	USD
CY2014Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3284800000	USD
CY2015Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3639100000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1100000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	800000	USD
CY2014Q3	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	2100000	USD
	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	5900000	USD
CY2015Q3	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	1000000	USD
	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	2600000	USD
CY2014Q4	us-gaap	Real Estate Investments RealEstateInvestments	88200000	USD
CY2015Q3	us-gaap	Real Estate Investments RealEstateInvestments	88300000	USD
CY2014Q3	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-300000	USD
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-800000	USD
CY2015Q3	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-300000	USD
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-800000	USD
CY2014Q4	us-gaap	Regulatory Assets RegulatoryAssets	373600000	USD
CY2015Q3	us-gaap	Regulatory Assets RegulatoryAssets	369600000	USD
CY2014Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	16300000	USD
CY2015Q3	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	16300000	USD
CY2014Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	357300000	USD
CY2015Q3	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	353300000	USD
CY2014Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	94200000	USD
CY2015Q3	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	105800000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	134100000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	81800000	USD
CY2014Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	2700000	USD
CY2015Q3	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	8100000	USD
CY2014Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	530100000	USD
CY2015Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	578800000	USD
CY2014Q3	us-gaap	Revenues Revenues	288900000	USD
	us-gaap	Revenues Revenues	846100000	USD
CY2015Q3	us-gaap	Revenues Revenues	462500000	USD
	us-gaap	Revenues Revenues	1105800000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	1700000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	2100000	USD
	us-gaap	Stock Issued During Period Shares Employee Benefit Plan StockIssuedDuringPeriodSharesEmployeeBenefitPlan	400000	shares
	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	19500000	USD
	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	0	USD
CY2014Q4	us-gaap	Stockholders Equity StockholdersEquity	1609400000	USD
CY2015Q3	us-gaap	Stockholders Equity StockholdersEquity	1821700000	USD
CY2014Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1611200000	USD
CY2015Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1823400000	USD
CY2014Q3	us-gaap	Taxes Other TaxesOther	11400000	USD
	us-gaap	Taxes Other TaxesOther	33900000	USD
CY2015Q3	us-gaap	Taxes Other TaxesOther	12300000	USD
	us-gaap	Taxes Other TaxesOther	38500000	USD
CY2014Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	38700000	USD
CY2015Q3	us-gaap	Taxes Payable Current TaxesPayableCurrent	34800000	USD
	us-gaap	Types Of Net Regulatory Assets Earning Returns TypesOfNetRegulatoryAssetsEarningReturns	No regulatory assets or liabilities are currently earning a return.
CY2014Q4	us-gaap	Unearned Esop Shares UnearnedESOPShares	7200000	USD
CY2015Q3	us-gaap	Unearned Esop Shares UnearnedESOPShares	1400000	USD
CY2014Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	2000000	USD
CY2015Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	2900000	USD
CY2015Q3	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	400000	USD
CY2014Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	200000	shares
CY2015Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	100000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	100000	shares
CY2014Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	42900000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	42300000	shares
CY2015Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48900000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48100000	shares
CY2014Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	42900000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	42100000	shares
CY2015Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	48800000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	48000000	shares
	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>
	us-gaap	Revenue Recognition Percentage Of Completion Method RevenueRecognitionPercentageOfCompletionMethod	<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;">As a result of the NDPSC approval of the sale agreement with Montana-Dakota Utilities in the second quarter of 2015, ALLETE Clean Energy began accounting for the project under the percentage of completion method of accounting for contracts. The percentage of completion used to recognize revenue and cost of sales is calculated based on the percentage of construction costs incurred at the measurement date compared to the estimated total construction costs. We have selected this method because we consider construction costs to be the best available measure of progress on the project. Any adjustments to the estimated percentage of completion or estimated earnings, and the related impacts to operating income, are recorded in the period they become known. </font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></div>

Files In Submission

Name	View Source	Status
0000066756-15-000104-index-headers.html	Edgar Link	pending
0000066756-15-000104-index.html	Edgar Link	pending
0000066756-15-000104.txt	Edgar Link	pending
0000066756-15-000104-xbrl.zip	Edgar Link	pending
ale-20150930.xml	Edgar Link	completed
ale-20150930.xsd	Edgar Link	pending
ale-20150930_cal.xml	Edgar Link	unprocessable
ale-20150930_def.xml	Edgar Link	unprocessable
ale-20150930_lab.xml	Edgar Link	unprocessable
ale-20150930_pre.xml	Edgar Link	unprocessable
ale9-30x201510xq.htm	Edgar Link	pending
ale9-30x2015exx31a.htm	Edgar Link	pending
ale9-30x2015exx31b.htm	Edgar Link	pending
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ale9-30x2015exx4a.htm	Edgar Link	pending
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ale9-30x2015exx99.htm	Edgar Link	pending
alletelogoqa01.jpg	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$ALE
ALLETE INC Stock $ale

2015 Q3 Form 10-Q Financial Statement

#000006675615000104 Filed on November 03, 2015

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ALE ALLETE INC Stock $ale

2015 Q3 Form 10-Q Financial Statement

#000006675615000104 Filed on November 03, 2015

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ALE
ALLETE INC Stock $ale