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Operations and Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Business Segments [Line Items] |  |  |  |
Total Inventories | 102.7 us-gaap_InventoryNet |  | $ 80.5 us-gaap_InventoryNet |
Prepayments and Other Current Assets [Abstract] |  |  |  |
Deferred Fuel Adjustment Clause | 15.6 us-gaap_DeferredFuelCost |  | 16.3 us-gaap_DeferredFuelCost |
Construction Costs for Development Project | 48.4 us-gaap_ConstructionInProgressGross | [1] | 48.2 us-gaap_ConstructionInProgressGross | [1]
Restricted Cash | 5.6 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue | [2] | 2.7 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue | [2]
Other | 18.9 us-gaap_OtherAssetsMiscellaneousCurrent |  | 14.8 us-gaap_OtherAssetsMiscellaneousCurrent |
Total Prepayments and Other Current Assets | 88.5 us-gaap_PrepaidExpenseAndOtherAssetsCurrent |  | 82.0 us-gaap_PrepaidExpenseAndOtherAssetsCurrent |
Other Non-Current Assets [Abstract] |  |  |  |
Restricted Cash | 5.3 us-gaap_RestrictedCashAndCashEquivalentsNoncurrent |  | 5.3 us-gaap_RestrictedCashAndCashEquivalentsNoncurrent |
Other Current Liabilites [Abstract] |  |  |  |
Customer Deposits | 20.0 us-gaap_CustomerDepositsCurrent |  | 19.7 us-gaap_CustomerDepositsCurrent |
Power Purchase Agreements | 18.9 ale_PowerPurchaseAgreementCurrent | [3] | 19.4 ale_PowerPurchaseAgreementCurrent | [3]
Construction Deposits Received for Development Project | 54.3 us-gaap_CustomerAdvancesCurrent | [4] | 54.3 us-gaap_CustomerAdvancesCurrent | [4]
Other | 25.4 us-gaap_OtherAccruedLiabilitiesCurrent |  | 27.4 us-gaap_OtherAccruedLiabilitiesCurrent |
Total Other Current Liabilities | 118.6 us-gaap_OtherLiabilitiesCurrent |  | 120.8 us-gaap_OtherLiabilitiesCurrent |
Other Non-Current Liabilities [Abstract] |  |  |  |
Asset Retirement Obligation | 111.6 us-gaap_AssetRetirementObligationsNoncurrent |  | 109.2 us-gaap_AssetRetirementObligationsNoncurrent |
Power Purchase Agreements | 106.3 ale_PowerPurchaseAgreementNoncurrent | [3] | 110.7 ale_PowerPurchaseAgreementNoncurrent | [3]
Contingent Consideration | 35.8 us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent | [5] | 0 us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent | [5]
Other | 48.6 us-gaap_OtherAccruedLiabilitiesNoncurrent |  | 45.1 us-gaap_OtherAccruedLiabilitiesNoncurrent |
Total Other Non-Current Liabilities | 302.3 us-gaap_OtherLiabilitiesNoncurrent |  | 265.0 us-gaap_OtherLiabilitiesNoncurrent |
Minimum [Member] |  |  |  |
Goodwill and Intangible Assets [Abstract] |  |  |  |
Estimated Useful Life | 1 year |  |  |
Maximum [Member] |  |  |  |
Goodwill and Intangible Assets [Abstract] |  |  |  |
Estimated Useful Life | 23 years |  |  |
Regulated Operations [Member] |  |  |  |
Business Segments [Line Items] |  |  |  |
Fuel | 38.0 us-gaap_EnergyRelatedInventoryCoal / us-gaap_StatementBusinessSegmentsAxis = us-gaap_RegulatedOperationMember |  | 29.0 us-gaap_EnergyRelatedInventoryCoal / us-gaap_StatementBusinessSegmentsAxis = us-gaap_RegulatedOperationMember |
Materials and Supplies | 34.6 us-gaap_InventorySuppliesNetOfReserves / us-gaap_StatementBusinessSegmentsAxis = us-gaap_RegulatedOperationMember |  | 35.2 us-gaap_InventorySuppliesNetOfReserves / us-gaap_StatementBusinessSegmentsAxis = us-gaap_RegulatedOperationMember |
Total Inventories | 72.6 us-gaap_InventoryNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_RegulatedOperationMember |  | 64.2 us-gaap_InventoryNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_RegulatedOperationMember |
Investments and Other [Member] |  |  |  |
Business Segments [Line Items] |  |  |  |
Materials and Supplies | 16.3 us-gaap_InventorySuppliesNetOfReserves / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | 16.3 us-gaap_InventorySuppliesNetOfReserves / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Raw Materials | 3.1 us-gaap_InventoryRawMaterials / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | [6] | 0 us-gaap_InventoryRawMaterials / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Work in Progress | 1.0 us-gaap_InventoryWorkInProcess / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | [6] | 0 us-gaap_InventoryWorkInProcess / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Finished Goods | 10.2 us-gaap_InventoryFinishedGoods / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | [6] | 0 us-gaap_InventoryFinishedGoods / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Reserve for Obsolescence | (0.5)us-gaap_InventoryValuationReserves / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | [6] | 0 us-gaap_InventoryValuationReserves / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Total Inventories | 30.1 us-gaap_InventoryNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | $ 16.3 us-gaap_InventoryNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
[1] | Construction Costs for Development Project relate to ALLETE Clean Energy’s acquisition in November 2014 of a project to develop and construct a wind energy facility in 2015. (See Other Current Liabilities table and Note 4. Acquisitions.)
[2] | Restricted Cash related to ALLETE Clean Energy’s wind energy facilities operating expense and capital distribution reserve requirements and cash pledged as collateral by U.S. Water Services for stand-by letters of credit.
[3] | Power Purchase Agreements were acquired in conjunction with the ALLETE Clean Energy wind energy facilities acquisitions in 2014. (See Note 4. Acquisitions.)
[4] | Construction Deposits Received for Development Project relate to ALLETE Clean Energy’s project to develop and construct a wind energy facility in 2015. (See Prepayments and Other Current Assets table and Note 4. Acquisitions.)
[5] | Contingent Consideration relates to the estimated fair value of the earnings-based payment to acquire the remaining ownership interest in U.S. Water Services. (See Note 4. Acquisitions and Note 7. Fair Value.)
[6] | Raw materials, Work in Progress, Finished Goods, and Reserve for Obsolescence presented are attributable to U.S. Water Services which was acquired February 10, 2015.

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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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