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Goodwill and Intangible Assets (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Intangible Assets [Abstract] |  |  |  |
Definite-Lived Intangible Assets | $ 67.7 us-gaap_FiniteLivedIntangibleAssetsNet |  | $ 1.9 us-gaap_FiniteLivedIntangibleAssetsNet |
Definite-Lived Intangible Assets, Additions as a Result of Acquisitions | 66.4 us-gaap_FinitelivedIntangibleAssetsAcquired1 |  |  |
Definite-Lived Intangible Assets, Amortization | 0.6 us-gaap_AmortizationOfIntangibleAssets |  |  |
Total Intangible Assets | 84.3 us-gaap_IntangibleAssetsNetExcludingGoodwill |  | 1.9 us-gaap_IntangibleAssetsNetExcludingGoodwill |
Total Intangible Assets, Additions as a Result of Acquisitions | 83.0 ale_IntangibleAssetsAcquired |  |  |
Definite-Lived Intangible Assets, Fiscal Year Amortization Expense [Abstract] |  |  |  |
Definite-Lived Intangible Assets, Amortization Expense, Remainder of 2015 | 3.6 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear |  |  |
Definite-Lived Intangible Assets, Amortization Expense, 2016 | 4.3 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |  |
Definite-Lived Intangible Assets, Amortization Expense, 2017 | 4.2 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |  |
Definite-Lived Intangible Assets, Amortization Expense, 2018 | 4.1 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |  |
Definite-Lived Intangible Assets, Amortization Expense, 2019 | 4.0 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |  |
Definite-Lived Intangible Assets, Amortization Expense, 2020 and Thereafter | 47.5 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive |  |  |
Minimum [Member] |  |  |  |
Intangible Assets [Abstract] |  |  |  |
Definite-Lived Intangible Asset, Useful Life | 1 year |  |  |
Maximum [Member] |  |  |  |
Intangible Assets [Abstract] |  |  |  |
Definite-Lived Intangible Asset, Useful Life | 23 years |  |  |
Weighted Average [Member] |  |  |  |
Intangible Assets [Abstract] |  |  |  |
Definite-Lived Intangible Asset, Useful Life | 21 years |  |  |
Trademarks and Trade Names [Member] |  |  |  |
Intangible Assets [Abstract] |  |  |  |
Indefinite-Lived Intangible Assets | 16.6 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember |  | 0 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember |
Indefinite-lived Intangible Assets, Additions as a Result of Acquisitions | 16.6 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember |  |  |
Customer Relationships [Member] |  |  |  |
Intangible Assets [Abstract] |  |  |  |
Definite-Lived Intangible Assets | 59.6 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  | 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Definite-Lived Intangible Assets, Additions as a Result of Acquisitions | 60.1 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |
Definite-Lived Intangible Assets, Amortization | 0.5 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |
Definite-Lived Intangible Asset, Useful Life | 23 years |  |  |
Developed Technology and Other [Member] |  |  |  |
Intangible Assets [Abstract] |  |  |  |
Definite-Lived Intangible Assets | 8.1 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ale_DevelopedTechnologyandOtherMember | [1] | 1.9 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ale_DevelopedTechnologyandOtherMember | [1]
Definite-Lived Intangible Assets, Additions as a Result of Acquisitions | 6.3 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ale_DevelopedTechnologyandOtherMember | [1] |  |
Definite-Lived Intangible Assets, Amortization | 0.1 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ale_DevelopedTechnologyandOtherMember | [1] |  |
Developed Technology and Other [Member] | Minimum [Member] |  |  |  |
Intangible Assets [Abstract] |  |  |  |
Definite-Lived Intangible Asset, Useful Life | 1 year |  |  |
Developed Technology and Other [Member] | Maximum [Member] |  |  |  |
Intangible Assets [Abstract] |  |  |  |
Definite-Lived Intangible Asset, Useful Life | 14 years |  |  |
Developed Technology and Other [Member] | Weighted Average [Member] |  |  |  |
Intangible Assets [Abstract] |  |  |  |
Definite-Lived Intangible Asset, Useful Life | 9 years |  |  |
Investments and Other [Member] |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Balance as of December 31, 2014 | 2.9 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |
Acquired Goodwill | 127.1 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |
Balance as of March 31, 2015 | $ 130.0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |
[1] | Developed Technology and Other includes patents, non-compete agreements, and land easements.

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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