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Consolidated Statement of Shareholders' Equity (USD $) In Millions, unless otherwise specified | Total | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Unearned ESOP Shares | Common Stock
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2011 | $ 1,079.3 us-gaap_StockholdersEquity | $ 431.6 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (28.9)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (29.0)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember | $ 705.6 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Comprehensive Income |  |  |  |  |
Net Income | 97.1 us-gaap_ProfitLoss | 97.1 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Other Comprehensive Income - Net of Tax |  |  |  |  |
Unrealized Gain (Loss) on Securities - Net | 1.2 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  | 1.2 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Unrealized Gain (Loss) on Derivatives - Net | (0.2)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax |  | (0.2)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Defined Benefit Pension and Other Postretirement Plans - Net | 5.9 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax |  | 5.9 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Total Comprehensive Income | 104.0 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest |  |  |  |
Non-Controlling Interest in Subsidiaries | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest |  |  |  |
Comprehensive Income Attributable to ALLETE | 104.0 us-gaap_ComprehensiveIncomeNetOfTax |  |  |  |
Common Stock Issued - Net | 79.1 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  |  | 79.1 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Dividends Declared | (69.1)us-gaap_DividendsCommonStock | (69.1)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
ESOP Shares Earned | 7.7 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan |  |  | 7.7 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember |
Balance at Dec. 31, 2012 | 1,201.0 us-gaap_StockholdersEquity | 459.6 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (22.0)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (21.3)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember | 784.7 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Comprehensive Income |  |  |  |  |
Net Income | 104.7 us-gaap_ProfitLoss | 104.7 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Other Comprehensive Income - Net of Tax |  |  |  |  |
Unrealized Gain (Loss) on Securities - Net | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  |  |  |
Unrealized Gain (Loss) on Derivatives - Net | 0.1 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax |  | 0.1 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Defined Benefit Pension and Other Postretirement Plans - Net | 4.8 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax |  | 4.8 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Total Comprehensive Income | 109.6 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest |  |  |  |
Non-Controlling Interest in Subsidiaries | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest |  |  |  |
Comprehensive Income Attributable to ALLETE | 109.6 us-gaap_ComprehensiveIncomeNetOfTax |  |  |  |
Common Stock Issued - Net | 100.5 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  |  | 100.5 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Dividends Declared | (75.2)us-gaap_DividendsCommonStock | (75.2)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
ESOP Shares Earned | 7.0 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan |  |  | 7.0 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember |
Balance at Dec. 31, 2013 | 1,342.9 us-gaap_StockholdersEquity | 489.1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (17.1)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (14.3)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember | 885.2 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Comprehensive Income |  |  |  |  |
Net Income | 125.5 us-gaap_ProfitLoss | 125.5 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Other Comprehensive Income - Net of Tax |  |  |  |  |
Unrealized Gain (Loss) on Securities - Net | (0.2)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  | (0.2)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Unrealized Gain (Loss) on Derivatives - Net | 0.2 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax |  | 0.2 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Defined Benefit Pension and Other Postretirement Plans - Net | (4.0)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax |  | (4.0)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Total Comprehensive Income | 121.5 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest |  |  |  |
Non-Controlling Interest in Subsidiaries | (0.7)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest | (0.7)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Comprehensive Income Attributable to ALLETE | 120.8 us-gaap_ComprehensiveIncomeNetOfTax |  |  |  |
Common Stock Issued - Net | 222.4 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  |  | 222.4 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Dividends Declared | (83.8)us-gaap_DividendsCommonStock | (83.8)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
ESOP Shares Earned | 7.1 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan |  |  | 7.1 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember |
Balance at Dec. 31, 2014 | $ 1,609.4 us-gaap_StockholdersEquity | $ 530.1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (21.1)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (7.2)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember | $ 1,107.6 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember

X
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