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Investments (Tables) | 12 Months Ended
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Dec. 31, 2014
Investments [Abstract] |
Other Investments and ALLETE Properties [Table Text Block] |
Other Investments |  |
As of December 31 | 2014 |  | 2013 |
Millions |  |
ALLETE Properties |  | $88.2 |  |  | $89.9 |
Available-for-sale Securities (a) | 18.9 |  | 17.7 |
Cash Equivalents (b) | 2.9 |  | 34.2 |
Other | 4.4 |  | 4.5 |
Total Other Investments |  | $114.4 |  |  | $146.3 |
(a) | As of December 31, 2014, the aggregate amount of available-for-sale corporate debt securities maturing in one year or less was $0.6 million, in one year to less than three years was $1.7 million, in three years to less than five years was $2.6 million, and in five or more years was $5.9 million.
(b) | During 2014, cash included in Other Investments was transferred to Cash and Cash Equivalents.
ALLETE Properties |  |
As of December 31 | 2014 |  | 2013 |
Millions |  |
Land Inventory Beginning Balance |  | $85.4 |  |  | $86.5 |
Cost of Sales | (2.2 | ) | (1.5 | )
Other | 0.6 |  | 0.4 |
Land Inventory Ending Balance | 83.8 |  | 85.4 |
Long-Term Finance Receivables (net of allowances of $0.6 and $0.6) | 1.2 |  | 1.4 |
Other | 3.2 |  | 3.1 |
Total Real Estate Assets |  | $88.2 |  |  | $89.9 |
Available-for-sale Securities [Table Text Block] |
Available-For-Sale Securities
Millions |  | Gross Unrealized |
As of December 31 | Cost | Gain | Loss | Fair Value
2014 | $19.6 | $0.2 | $0.9 | $18.9
2013 | $18.3 | — | $0.6 | $17.7
2012 | $27.4 | $0.5 | $1.1 | $26.8
|  | Net | Gross Realized
Year Ended December 31 |  | Proceeds | Gain | Loss
2014 |  | $3.6 | $0.2 | —
2013 |  | $16.1 | $2.2 | —
2012 |  | $1.5 | — | —
Available-for-sale Securities [Table Text Block] |
Available-For-Sale Securities
Millions |  | Gross Unrealized |
As of December 31 | Cost | Gain | Loss | Fair Value
2014 | $19.6 | $0.2 | $0.9 | $18.9
2013 | $18.3 | — | $0.6 | $17.7
2012 | $27.4 | $0.5 | $1.1 | $26.8
|  | Net | Gross Realized
Year Ended December 31 |  | Proceeds | Gain | Loss
2014 |  | $3.6 | $0.2 | —
2013 |  | $16.1 | $2.2 | —
2012 |  | $1.5 | — | —

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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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