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v2.4.1.9

Consolidated Balance Sheet (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Current Assets [Abstract] |  |
Cash and Cash Equivalents | $ 72.1 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 145.8 us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts Receivable (Less Allowance of $1.1 and $1.1) | 111.8 us-gaap_AccountsReceivableNetCurrent | 103.0 us-gaap_AccountsReceivableNetCurrent
Inventories | 102.7 us-gaap_InventoryNet | 80.5 us-gaap_InventoryNet
Prepayments and Other | 88.5 us-gaap_OtherAssetsCurrent | 82.0 us-gaap_OtherAssetsCurrent
Deferred Income Taxes | 14.9 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent | 7.5 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Total Current Assets | 390.0 us-gaap_AssetsCurrent | 418.8 us-gaap_AssetsCurrent
Property, Plant and Equipment - Net | 3,319.2 us-gaap_PropertyPlantAndEquipmentNet | 3,284.8 us-gaap_PropertyPlantAndEquipmentNet
Regulatory Assets | 358.0 us-gaap_RegulatoryAssetsNoncurrent | 357.3 us-gaap_RegulatoryAssetsNoncurrent
Investment in ATC | 122.3 us-gaap_EquityMethodInvestments | 121.1 us-gaap_EquityMethodInvestments
Other Investments | 114.7 us-gaap_LongTermInvestments | 114.4 us-gaap_LongTermInvestments
Goodwill and Intangible Assets – Net | 214.3 us-gaap_IntangibleAssetsNetIncludingGoodwill | 4.8 us-gaap_IntangibleAssetsNetIncludingGoodwill
Other Non-Current Assets | 61.6 us-gaap_OtherAssetsNoncurrent | 59.6 us-gaap_OtherAssetsNoncurrent
Total Assets | 4,580.1 us-gaap_Assets | 4,360.8 us-gaap_Assets
Current Liabilities [Abstract] |  |
Accounts Payable | 98.9 us-gaap_AccountsPayableCurrent | 134.1 us-gaap_AccountsPayableCurrent
Accrued Taxes | 47.4 us-gaap_TaxesPayableCurrent | 38.7 us-gaap_TaxesPayableCurrent
Accrued Interest | 14.5 us-gaap_InterestAndDividendsPayableCurrent | 18.0 us-gaap_InterestAndDividendsPayableCurrent
Long-Term Debt Due Within One Year | 122.3 us-gaap_LongTermDebtCurrent | 100.7 us-gaap_LongTermDebtCurrent
Notes Payable | 0.3 us-gaap_NotesPayableCurrent | 3.7 us-gaap_NotesPayableCurrent
Other | 118.6 us-gaap_OtherLiabilitiesCurrent | 120.8 us-gaap_OtherLiabilitiesCurrent
Total Current Liabilities | 402.0 us-gaap_LiabilitiesCurrent | 416.0 us-gaap_LiabilitiesCurrent
Long-Term Debt | 1,253.8 us-gaap_LongTermDebtNoncurrent | 1,272.8 us-gaap_LongTermDebtNoncurrent
Deferred Income Taxes | 559.5 us-gaap_DeferredTaxLiabilitiesNoncurrent | 510.7 us-gaap_DeferredTaxLiabilitiesNoncurrent
Regulatory Liabilities | 101.2 us-gaap_RegulatoryLiabilityNoncurrent | 94.2 us-gaap_RegulatoryLiabilityNoncurrent
Defined Benefit Pension and Other Postretirement Benefit Plans | 190.4 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent | 190.9 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
Other Non-Current Liabilities | 302.3 us-gaap_OtherLiabilitiesNoncurrent | 265.0 us-gaap_OtherLiabilitiesNoncurrent
Total Liabilities | 2,809.2 us-gaap_Liabilities | 2,749.6 us-gaap_Liabilities
Commitments, Guarantees and Contingencies (Note 16) |  |
Equity [Abstract] |  |
Common Stock Without Par Value, 80.0 Shares Authorized, 48.8 and 45.9 Shares Outstanding | 1,249.7 us-gaap_CommonStockValue | 1,107.6 us-gaap_CommonStockValue
Unearned ESOP Shares | (5.3)us-gaap_UnearnedESOPShares | (7.2)us-gaap_UnearnedESOPShares
Accumulated Other Comprehensive Loss | (20.6)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (21.1)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Retained Earnings | 545.1 us-gaap_RetainedEarningsAccumulatedDeficit | 530.1 us-gaap_RetainedEarningsAccumulatedDeficit
Total ALLETE Equity | 1,768.9 us-gaap_StockholdersEquity | 1,609.4 us-gaap_StockholdersEquity
Non-Controlling Interest in Subsidiaries | 2.0 us-gaap_MinorityInterest | 1.8 us-gaap_MinorityInterest
Total Equity | 1,770.9 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 1,611.2 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total Liabilities and Equity | $ 4,580.1 us-gaap_LiabilitiesAndStockholdersEquity | $ 4,360.8 us-gaap_LiabilitiesAndStockholdersEquity

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