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Investments (Tables) | 6 Months Ended
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Jun. 30, 2012
Investments [Abstract] |
Long-Term Investment Portfolio [Table Text Block] |
Investments | June 30, 2012 |  |  | December 31, 2011 |
Millions |  |  |
ALLETE Properties |  | $91.2 |  |  |  | $91.3 |
Available-for-sale Securities | 26.7 |  |  | 24.7 |
Other | 18.1 |  |  | 16.3 |
Total Investments |  | $136.0 |  |  |  | $132.3 |
ALLETE Properties | June 30, 2012 |  |  | December 31, 2011 |
Millions |  |  |
Land Inventory Beginning Balance (January 1, 2012 and 2011, respectively) |  | $86.0 |  |  |  | $86.0 |
Deeds to Collateralized Property | 0.5 |  |  | 1.8 |
Land Impairment | — |  |  | (1.7 | )
Capitalized Improvements and Other | 0.1 |  |  | 0.2 |
Cost of Real Estate Sold | — |  |  | (0.3 | )
Land Inventory Ending Balance | 86.6 |  |  | 86.0 |
Long-Term Finance Receivables (net of allowances of $0.6 and $0.6) | 1.4 |  |  | 2.0 |
Other | 3.2 |  |  | 3.3 |
Total Real Estate Assets |  | $91.2 |  |  |  | $91.3 |

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- Definition A table of investments, shown as a text block. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 6 -Section 10 -Paragraph (c) -Subparagraph (1) + Details
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