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Investments (Tables) | 6 Months Ended
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Jun. 30, 2013
Investments [Abstract] |
Other Investments and ALLETE Properties [Table Text Block] |
Other Investments | June 30, 2013 |  |  | December 31, 2012 |
Millions |  |  |
ALLETE Properties |  | $91.1 |  |  |  | $91.1 |
Available-for-sale Securities (a) | 20.4 |  |  | 26.8 |
Cash Equivalents | 24.4 |  |  | 20.7 |
Other | 4.3 |  |  | 4.9 |
Total Other Investments |  | $140.2 |  |  |  | $143.5 |
(a) | As of June 30, 2013, the aggregate amount of available-for-sale corporate debt securities maturing in one year or less was $1.2 million, in one year to less than three years was $5.1 million, in three years to less than five years was $1.3 million, and in five or more years was $0.9 million.
ALLETE Properties | June 30, 2013 |  |  | December 31, 2012 |
Millions |  |  |
Land Inventory Beginning Balance |  | $86.5 |  |  |  | $86.0 |
Deeds to Collateralized Property | — |  |  | 0.5 |
Cost of Sales | — |  |  | (0.2 | )
Capitalized Improvements and Other | 0.1 |  |  | 0.2 |
Land Inventory Ending Balance | 86.6 |  |  | 86.5 |
Long-Term Finance Receivables (net of allowances of $0.6 and $0.6) | 1.4 |  |  | 1.4 |
Other | 3.1 |  |  | 3.2 |
Total Real Estate Assets |  | $91.1 |  |  |  | $91.1 |

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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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