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Short-term and Long-term Debt - Financial Covenants (Details) | Dec. 31, 2014
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Financial Covenants [Abstract] |
Required Indebtedness to Total Capital Ratio | 0.65 ale_DebtInstrumentRequiredIndebtednessToTotalCapitalRatio
Actual Indebtedness to Total Capital Ratio | 0.47 ale_DebtInstrumentActualIndebtednessToTotalCapitalRatio

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- Definition Actual indebtedness to total capital ratio required to be maintained by most restrictive financial covenant. + References No definition available. + Details
Name: | ale_DebtInstrumentActualIndebtednessToTotalCapitalRatio
Namespace Prefix: | ale_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Definition Indebtedness to total capital ratio required to be maintained by most restrictive financial covenant. + References No definition available. + Details
Name: | ale_DebtInstrumentRequiredIndebtednessToTotalCapitalRatio
Namespace Prefix: | ale_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | ale_FinancialCovenantsAbstract
Namespace Prefix: | ale_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration