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Investments (Tables) | 9 Months Ended
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Sep. 30, 2011
Investments [Abstract] |
Long-Term Investment Portfolio [Table Text Block] |
Investments | September 30, 2011 |  | December 31, 2010
Millions |  |  |
ALLETE Properties | $93.0 |  | $94.0
Available-for-sale Securities | 30.5 |  | 25.2
Other | 6.0 |  | 6.8
Total Investments | $129.5 |  | $126.0
ALLETE Properties | September 30, 2011 |  | December 31, 2010 |
Millions |  |  |
Land Held-for-sale Beginning Balance (January 1, 2011 and 2010, respectively) | $86.0 |  | $74.9
Deeds to Collateralized Property | 1.9 |  | 9.9
Capitalized Improvements and Other | 0.1 |  | 1.2
Cost of Real Estate Sold | (0.3) |  | — |
Land Held-for-sale Ending Balance | 87.7 |  | 86.0
Long-Term Finance Receivables (net of allowances of $0.6 and $0.8) | 2.0 |  | 3.7
Other | 3.3 |  | 4.3
Total Real Estate Assets | $93.0 |  | $94.0
Long-Term Finance Receivables Allowance Roll-Forward [Table Text Block] |
Long-Term Finance Receivables | Real
Allowance Roll-Forward | Estate
Millions |
Beginning Balance as of December 31, 2010 | $0.8
Reduction to Reserve | (0.2)
Ending Balance as of September 30, 2011 | $0.6

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- Definition Tabular disclosure of credit losses for current financing receivables (such as trade and accounts receivable), including a rollforward of the balance. An alternative caption includes allowance for doubtful accounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 310 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (c) -Name Accounting Standards Codification -Paragraph 11B -Section 50 -URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953423-111524 + Details
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