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Investments (Tables) | 3 Months Ended
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Mar. 31, 2015
Investments [Abstract] |
Other Investments and ALLETE Properties [Table Text Block] |
Other Investments | March 31, 2015 |  |  | December 31, 2014 |
Millions |  |  |
ALLETE Properties |  | $88.3 |  |  |  | $88.2 |
Available-for-sale Securities (a) | 19.3 |  |  | 18.9 |
Cash Equivalents | 2.8 |  |  | 2.9 |
Other | 4.3 |  |  | 4.4 |
Total Other Investments |  | $114.7 |  |  |  | $114.4 |
(a) | As of March 31, 2015, the aggregate amount of available-for-sale corporate debt securities maturing in one year or less was $0.4 million, in one year to less than three years was $1.7 million, in three years to less than five years was $3.0 million, and in five or more years was $5.9 million.
NOTE 3. INVESTMENTS (Continued)
ALLETE Properties | March 31, 2015 |  |  | December 31, 2014 |
Millions |  |  |
Land Inventory Beginning Balance |  | $83.8 |  |  |  | $85.4 |
Cost of Sales | — |  |  | (2.2 | )
Other | 0.1 |  |  | 0.6 |
Land Inventory Ending Balance | 83.9 |  |  | 83.8 |
Long-Term Finance Receivables (net of allowances of $0.6 and $0.6) | 1.2 |  |  | 1.2 |
Other | 3.2 |  |  | 3.2 |
Total Real Estate Assets |  | $88.3 |  |  |  | $88.2 |
Available-for-sale Securities [Table Text Block] |
Available-For-Sale Securities |  |  |  |
Millions |  | Gross Unrealized |
| Cost | Gain | Loss | Fair Value
March 31, 2015 | $19.8 | $0.3 | $0.8 | $19.3
December 31, 2014 | $19.6 | $0.2 | $0.9 | $18.9

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