Consolidated Statement of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Consolidated Statement of Income [Abstract]
Operating Revenue	$ 320.0us-gaap_Revenues	$ 296.5us-gaap_Revenues
Operating Expenses [Abstract]
Fuel and Purchased Power	86.0us-gaap_CostOfPurchasedPower	96.2us-gaap_CostOfPurchasedPower
Transmission Services	14.9us-gaap_CostOfTransmission	10.8us-gaap_CostOfTransmission
Cost of Sales	31.2us-gaap_CostOfGoodsAndServicesSold	23.5us-gaap_CostOfGoodsAndServicesSold
Operating and Maintenance	79.7us-gaap_OperatingExpenses	74.3us-gaap_OperatingExpenses
Depreciation and Amortization	39.0	32.2
Taxes Other than Income Taxes	12.8us-gaap_TaxesOther	11.2us-gaap_TaxesOther
Total Operating Expenses	263.6us-gaap_CostsAndExpenses	248.2us-gaap_CostsAndExpenses
Operating Income	56.4us-gaap_OperatingIncomeLoss	48.3us-gaap_OperatingIncomeLoss
Other Income (Expense) [Abstract]
Interest Expense	(15.1)us-gaap_InterestExpense	(12.8)us-gaap_InterestExpense
Equity Earnings in ATC	3.9	5.1
Other	1.1us-gaap_OtherNonoperatingIncomeExpense	2.0us-gaap_OtherNonoperatingIncomeExpense
Total Other Expense	(10.1)us-gaap_NonoperatingIncomeExpense	(5.7)us-gaap_NonoperatingIncomeExpense
Income Before Non-Controlling Interest and Income Taxes	46.3	42.6
Income Tax Expense	6.2us-gaap_IncomeTaxExpenseBenefit	8.8us-gaap_IncomeTaxExpenseBenefit
Net Income	40.1us-gaap_ProfitLoss	33.8us-gaap_ProfitLoss
Less: Non-Controlling Interest in Subsidiaries	0.2	0.3
Net Income Attributable to ALLETE	$ 39.9us-gaap_NetIncomeLoss	$ 33.5us-gaap_NetIncomeLoss
Average Shares of Common Stock and Per Share Data [Abstract]
Basic (in shares)	46.9	41.4
Diluted (in shares)	47.1	41.6
Basic Earnings Per Share of Common Stock	$ 0.85us-gaap_EarningsPerShareBasic	$ 0.81us-gaap_EarningsPerShareBasic
Diluted Earnings Per Share of Common Stock	$ 0.85us-gaap_EarningsPerShareDiluted	$ 0.80us-gaap_EarningsPerShareDiluted
Dividends Per Share of Common Stock	$ 0.505	$ 0.49

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