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Other Income (Expense) (Tables) | 6 Months Ended
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Jun. 30, 2012
Other Income (Expense) [Abstract] |
Other Income (Expense) [Table Text Block] |
|  | Quarter Ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | 2012 |  | 2011 |  | 2012 |  | 2011
Millions |  |  |  |  |  |  |  |
AFUDC – Equity |  |  | $1.2 |  |  |  | $0.5 |  |  |  | $1.9 |  |  |  | $1.1 |
Investment and Other Income |  | — |  |  | 0.5 |  |  | — |  |  | 0.7 |
Total Other Income |  |  | $1.2 |  |  |  | $1.0 |  |  |  | $1.9 |  |  |  | $1.8 |

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- Details
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Namespace Prefix: | ale_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition Tabular disclosure of the components of non-operating income or non-operating expense that may include amounts earned from dividends, interest on securities, gains (losses) on securities sold, equity earnings of unconsolidated affiliates, net gain (loss) on sales of business, interest expense and other miscellaneous income or expense items. + References No definition available. + Details
Name: | us-gaap_ScheduleOfOtherNonoperatingIncomeExpenseTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration