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v2.4.1.9

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 | $ 320.0 us-gaap_Revenues | $ 296.5 us-gaap_Revenues
Operating Expenses [Abstract] |  |
Fuel and Purchased Power | 86.0 us-gaap_CostOfPurchasedPower | 96.2 us-gaap_CostOfPurchasedPower
Transmission Services | 14.9 us-gaap_CostOfTransmission | 10.8 us-gaap_CostOfTransmission
Cost of Sales | 31.2 us-gaap_CostOfGoodsAndServicesSold | 23.5 us-gaap_CostOfGoodsAndServicesSold
Operating and Maintenance | 79.7 us-gaap_OperatingExpenses | 74.3 us-gaap_OperatingExpenses
Depreciation and Amortization | 39.0 us-gaap_DepreciationDepletionAndAmortization | 32.2 us-gaap_DepreciationDepletionAndAmortization
Taxes Other than Income Taxes | 12.8 us-gaap_TaxesOther | 11.2 us-gaap_TaxesOther
Total Operating Expenses | 263.6 us-gaap_CostsAndExpenses | 248.2 us-gaap_CostsAndExpenses
Operating Income | 56.4 us-gaap_OperatingIncomeLoss | 48.3 us-gaap_OperatingIncomeLoss
Other Income (Expense) [Abstract] |  |
Interest Expense | (15.1)us-gaap_InterestExpense | (12.8)us-gaap_InterestExpense
Equity Earnings in ATC | 3.9 us-gaap_IncomeLossFromEquityMethodInvestments | 5.1 us-gaap_IncomeLossFromEquityMethodInvestments
Other | 1.1 us-gaap_OtherNonoperatingIncomeExpense | 2.0 us-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 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 42.6 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income Tax Expense | 6.2 us-gaap_IncomeTaxExpenseBenefit | 8.8 us-gaap_IncomeTaxExpenseBenefit
Net Income | 40.1 us-gaap_ProfitLoss | 33.8 us-gaap_ProfitLoss
Less: Non-Controlling Interest in Subsidiaries | 0.2 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 0.3 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net Income Attributable to ALLETE | $ 39.9 us-gaap_NetIncomeLoss | $ 33.5 us-gaap_NetIncomeLoss
Average Shares of Common Stock and Per Share Data [Abstract] |  |
Basic (in shares) | 46.9 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 41.4 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) | 47.1 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 41.6 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic Earnings Per Share of Common Stock | $ 0.85 us-gaap_EarningsPerShareBasic | $ 0.81 us-gaap_EarningsPerShareBasic
Diluted Earnings Per Share of Common Stock | $ 0.85 us-gaap_EarningsPerShareDiluted | $ 0.80 us-gaap_EarningsPerShareDiluted
Dividends Per Share of Common Stock | $ 0.505 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.49 us-gaap_CommonStockDividendsPerShareDeclared

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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