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Investments (Tables) | 9 Months Ended
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Sep. 30, 2016
Investments [Abstract] |
Other Investments [Table Text Block] |
Other Investments | September 30, 2016 |  |  | December 31, 2015 |
Millions |  |  |
ALLETE Properties (a) |  | $32.9 |  |  |  | $50.1 |
Available-for-sale Securities (b) | 19.4 |  |  | 18.5 |
Cash Equivalents | 2.0 |  |  | 2.0 |
Other | 3.8 |  |  | 4.0 |
Total Other Investments |  | $58.1 |  |  |  | $74.6 |
(a) | On September 22, 2016, ALLETE Properties sold its Ormond Crossings project and Lake Swamp wetland mitigation bank for consideration of approximately $21 million. The consideration included a down payment in the form of 0.1 million shares of ALLETE common stock with a value of $8.0 million, with the remaining purchase price to be paid under the terms of a finance receivable due over a five-year period which bears interest at market rates. The finance receivable is collateralized by the property sold.
(b) | As of September 30, 2016, the aggregate amount of available-for-sale corporate and governmental debt securities maturing in one year or less was $0.2 million, in one year to less than three years was $2.7 million, in three years to less than five years was $5.5 million, and in five or more years was $3.3 million.

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